UKPSC ITI Foreman Instructor 2024: Government Industrial Training Institute Foreman Instructor Examination, Electrical Engineering
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1. Average value of a sinusoidal current is _________ of the maximum current.
(a) 67.3% (b) 63.7% (c) 32.7% (d) 36.3%
2. When a series RLC circuit is in resonance, then the current is ________ and impedance is
__________.
(a) maximum, maximum (b) maximum, minimum
(c) minimum, maximum (d) minimum, minimum
3. For a choke coil, current is always __________ the voltage.
(a) lagging (b) leading (c) in same phase with (d) unrelated to
4. Three 50 resistors are connected in star across 400 V, 3-phase supply. If one of the resistor
is disconnected, then the line current will be __________.
(a) 8 3 A (b) 8/ 3 A (c) 4 A (d) 8 A
5. A circuit, when connected to a 200 V mains, takes a current of 20 A, leading the voltage by
one twelfth of time period. The circuit resistance is
(a) 20 (b) 17.32 (c) 10 (d) 8.66
6. A coil takes a current of 6 A, when connected to 24 V DC supply. To obtain same current
with a 50 Hz AC supply, the voltage required was 30 V. Inductance and power factor will
be
(a) 3 , 0.8 (lag) (b) 6 , 0.8 (lag) (c) 3 , 0.6 (lag) (d) 6 , 0.6 (lag)
7. Reciprocal of Reluctance in a magnetic circuit is
(a) Resistance (b) Permeance (c) Admittance (d) Conductance
8. If the coefficient of coupling between two coils is increased, then the mutual inductance
between the coils
(a) remains same (b) is increased (c) is decreased (d) cannot say
9. No load current in a transformer
(a) lags behind the applied voltage by 90
(b) leads the applied voltage by 90
(c) lags behind the applied voltage by an angle less than 90
(d) leads the applied voltage by an angle less than 90
10. Which of the following has the highest efficiency ?
(a) DC shunt motor (b) Transformer
(c) Induction Motor (d) Synchronous Motor
11. Which of the following connections is best suited for a 3-phase, 4-wire service ?
(a) Y - Y (b) - (c) - Y (d) Y -
12. Which motor should not be started at no load ?
(a) Single phase induction motor (b) DC Shunt motor
(c) Reluctance motor (d) DC series motor
13. In Induction Motor, the length of air gap is kept as small as possible in order to have
(a) low hysteresis loss (b) low eddy current loss
(c) high power factor (d) low power factor
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1. (sinusoidal) , _____
(a) 67.3% (b) 63.7% (c) 32.7% (d) 36.3%
2. RLC , _____ (impedance) _____
(a) , (b) ,
(c) , (d) ,
3. _____
(a) (b) (c) (d)
4. 50 400 V, 3- ,
(a) 8 3 A (b) 8/ 3 A (c) 4 A (d) 8 A
5. 200 V (mains) , 20 A ,
1/12th
(a) 20 (b) 17.32 (c) 10 (d) 8.66
6. 24 V .. , 6 A
50 Hz .. 30 V (inductance)
(Power Factor)
(a) 3 , 0.8 () (b) 6 , 0.8 ()
(c) 3 , 0.6 () (d) 6 , 0.6 ()
7.
(a) (b) (c) (d)
8. ,
(a) (b) (c) (d)
9. -
(a) 90
(b) 90
(c) 90
(d) 90
10. ?
(a) .. (b)
(c) (d) (synchronous motor)
11. 3- (3-phase), 4- ?
(a) Y – Y (b) – (c) – Y (d) Y –
12. , ?
(a) (b) ..
(c) () (d) ..
13. , :
(a) (hysteresis) (b) (Eddy)
(c) (d)
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14. In squirrel cage induction motor, the rotor slots are slightly skewed in order to reduce
(a) Windage loss (b) Eddy current loss
(c) Reduce magnetic humming (d) Friction losses
15. One of the speed control methods of a 3-phase induction motor is
(a) V/f control (b) Ward Leonard control
(c) Core loss control (d) Eddy current control
16. In three phase induction motor, reversing the supply in two of the phases is done for
(a) pole changing (b) increase the torque (c) control the current (d) plugging
17. A 3-phase, 400 V, 50 Hz, 4-pole induction motor is fed from a 3-phase supply and its rotor
runs at 1425 rpm. The frequency of rotor emf is
(a) 75 Hz (b) 50 Hz (c) 5 Hz (d) 2.5 Hz
18. An under-excited synchronous motor operates at
(a) lagging power factor
(b) unity power factor
(c) leading power factor
(d) lagging power factor at low load and leading power factor at high load
19. The full pitch of a 3-phase, 36 slots, 36 coils, 6-pole motor is
(a) 9 slots (b) 6 slots (c) 12 slots (d) 18 slots
20. 5% increase in supply frequency will change the synchronous speed by
(a) –10% (b) +10% (c) –5% (d) +5%
21. A 1.5 kW single-phase induction motor is drawing 8 A at 200 V. If the operating power
factor of the motor is 0.9, the power drawn by the motor is
(a) 1.5 kW (b) 1.44 kW (c) 1.08 kW (d) 1.35 kW
22. What turns-ratio of a transformer is needed to match 1 k source resistance to a 160 load ?
(a) 2.5 : 1 (b) 16 : 1 (c) 4 : 1 (d) 25 : 4
23. Star-Delta starter of an Induction motor
(a) inserts resistance in rotor circuit (b) inserts resistance in stator circuit
(c) applies reduced voltage to stator (d) applies reduced voltage to rotor
24. The maximum flux in a transformer is m, when the primary voltage is V and frequency is
f. If primary voltage is 2 V and frequency is f/2, the maximum flux will be
(a) 0.5 m (b) m (c) 2 m (d) 4 m
25. In a transformer, the core loss is 100 watts at 40 Hz and 72 watts at 30 Hz, then the hysteresis
loss at 50 Hz will be approximately
(a) 25 watts (b) 105 watts (c) 100 watts (d) 72 watts
26. A voltmeter gives 60 oscillations per minute, when connected to the rotor of an induction
motor. The stator supply frequency is 50 Hz. The slip of motor is
(a) 2% (b) 1% (c) 4% (d) 5%
27. Distribution transformers have good all day efficiency due to
(a) low iron loss (b) high copper loss (c) zero copper loss (d) high iron loss
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14. (squirrel) , ?
(a) (b)
(c) (d)
15.
(a) V/f (b) (c) (d)
16. ,
(a) (b) (c) (d)
17. , 400 V, 50 Hz, 4 , 1425
rpm ..
(a) 75 Hz (b) 50 Hz (c) 5 Hz (d) 2.5 Hz
18. - ()
(a)
(b)
(c)
(d)
19. , 36 , 36 , 6-
(a) 9 (b) 6 (c) 12 (d) 18
20. 5
(a) –10% (b) +10% (c) –5% (d) +5%
21. 1.5 kW 200 V 8 A 0.9
(a) 1.5 (b) 1.44 (c) 1.08 (d) 1.35
22. 1 k - , 160 ()
?
(a) 2.5 : 1 (b) 16 : 1 (c) 4 : 1 (d) 25 : 4
23. - , ?
(a) (b)
(c) (d)
24. , V f m
2 V f/2 ,
(a) 0.5 m (b) m (c) 2 m (d) 4 m
25. 40 Hz (core loss) 100 30 Hz (core loss)
72 , 50 Hz (Hysteresis Loss)
(a) 25 (b) 105 (c) 100 (d) 72
26. , , 60
50 Hz ,
(a) 2% (b) 1% (c) 4% (d) 5%
27. ,
(a) (b) (c) (d)
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28. A conductor of length 100 cm moves at right angle in a uniform field flux density of 1.5
Wb/m2 with a velocity of 50 m/s, the emf induced in the conductor will be
(a) 150 V (b) 75 V (c) 50 V (d) 37.5 V
29. If the rotor power output of a 3-phase induction motor is 15 kW, then rotor copper losses at
slip of 4% will be
(a) 700 W (b) 650 W (c) 625 W (d) 60 W
30. Interpoles are used in d.c. generator so as to
(a) reduce sparking at brushes (b) limit the current to a safe value
(c) stabilise the voltage (d) raise the voltage with load
31. A 230 V/2300 V transformer takes no load current of 5 A at 0.25 power factor lagging. The
core loss is
(a) 300.2 watts (b) 192.5 watts (c) 287.5 watts (d) 212.6 watts
32. A transformer has negative voltage regulation, when its load power factor is
(a) zero (b) unity (c) lagging (d) leading
33. The more dominant harmonic in the magnetising current of a transformer is
(a) 3rd (b) 5th (c) 7th (d) 13th
34. If the field current is decreased in dc shunt motor, the speed of motor
(a) decreases (b) increases (c) remains same (d) None of the above
35. A dc generator without a commutator works as
(a) DC motor (b) DC Generator (c) AC Generator (d) AC motor
36. Damper winding in synchronous motor is used to
(a) provide maximum torque
(b) provide starting torque and prevent hunting
(c) provide only starting torque
(d) only prevent hunting
37. Which of the following material does not have covalent bonds ?
(a) Most of the Metals (b) Organic Polymer
(c) Silicon (d) Diamond
38. Number of atoms per unit cell in FCC structure is
(a) 1 (b) 2 (c) 4 (d) 8
39. Electrical resistance of a semiconductor _________ with rise in temperature.
(a) increases linearly (b) remains constant
(c) decreases (d) increases non-linearly
40. A material with unequal antiparallel atomic magnetic moment is termed as
(a) Ferrite (b) Ferrimagnet
(c) Anti-ferromagnet (d) Non-magnetic
41. If the domain walls in a magnetic material can be easily moved, the material displays
(a) high permeability (b) high flux density
(c) permanent magnetic behaviour (d) temporary magnetic moment
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28. 1.5 Wb/m2 100 cm , 50 m/s
... (emf)
(a) 150 V (b) 75 V (c) 50 V (d) 37.5 V
29. 15 kW 4%
(a) 700 W (b) 650 W (c) 625 W (d) 60 W
30.
(a) (b)
(c) (d) ()
31. 230 V/2300 V , 0.25 5 A
(a) 300.2 watts (b) 192.5 watts (c) 287.5 watts (d) 212.6 watts
32. ,
(a) (b) (unity) (c) (d)
33. (harmonic) ?
(a) 3rd (b) 5th (c) 7th (d) 13th
34. ..
(a) (b)
(c) (d)
35. .. , _____
(a) .. (b) .. (c) .. (d) ..
36.
(a) (b)
(c) (d)
37. ?
(a) (b) (c) (d) (diamond)
38. FCC ?
(a) 1 (b) 2 (c) 4 (d) 8
39. (semiconductor)
(a) (b)
(c) (d)
40. , (antiparallel) ,
(a) (b) (c) - (d) -
41. (magnetic material) (domain walls) ,
(a) (high permeability) (b) (high flux density)
(c) (d) (temporary)
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42. Bakelite is/was not used in manufacturing of
(a) lamp holders (b) switches (c) plug sockets (d) transistors
43. ACSR (Aluminium Conductor Steel Reinforced) are used as
(a) overhead transmission lines (b) superconductors
(c) fuse (d) underground cables
44. The Dielectric constant of Air is practically taken as
(a) more than unity (b) unity (c) less than unity (d) zero
45. n-type of semiconductor is an example of
(a) superconductor (b) intrinsic semiconductor
(c) insulator (d) extrinsic semiconductor
46. Gold and Silver are
(a) Dielectric material (b) Insulating material
(c) Low resistivity conducting material (d) Magnetic material
47. The relative permeability of a soft paramagnetic substance is
(a) unity (b) slightly more than unity
(c) zero (d) slightly less than unity
48. For Germanium, forbidden gap is
(a) 0.7 eV (b) 0.5 eV (c) 0.25 eV (d) 0.15 eV
49. Resistivity of conductors is most affected by
(a) Voltage (b) Temperature (c) Pressure (d) Current
50. Hysteresis loss least depends on
(a) Frequency (b) Magnetic field intensity
(c) Volume of material (d) Grain orientation of material
51. Hall effect is used in
(a) Galvanometers (b) Ammeters (c) Transducers (d) Wattmeters
52. _________ is/are used to extract heat from flue gases and use it for heating feed water.
(a) Condenser (b) Economiser (c) Superheater (d) Cooling fans
53. Which of the following is usually not the distribution voltage ?
(a) 6.6 kV (b) 33 kV (c) 11 kV (d) 132 kV
54. Bundled conductors are used to
(a) increase reactance (b) increase corona loss
(c) reduce line length (d) reduce reactance
55. Skin effect in a conductor is increased if
(a) frequency is low. (b) size of conductor is small.
(c) frequency is high. (d) stress on conductor is more.
56. Self-GMD method is used to evaluate
(a) Inductance (b) Capacitance
(c) Both Inductance and Capacitance (d) Resistance
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57. Ferranti effect is experienced on long overhead transmission line, when it is
(a) lightly loaded (b) on full load at 0.8 p.f. lag
(c) on full load at unity p.f. (d) over loaded
58. In the figure given below, the value of R is
(a) 2.5 (b) 5.0 (c) 7.5 (d) 10.0
59. An alternator is supplying a load of 300 kW at a power factor of 0.6 lagging. If power factor
is raised to unity, how many more kilowatts can alternator supply, for same kVA loading ?
(a) 100 k watts (b) 200 k watts (c) 300 k watts (d) 500 k watts
60. The insulation level of a 400 kV EHV transmission line is decided on the basis of which of
the following ?
(a) Radio and TV interference (b) Corona inception voltage
(c) Lightening overvoltage (d) Switching overvoltage
61. Stringing chart is a graph between which of the following ?
(a) Height – Temperature (b) Load – Temperature
(c) Resistance – Temperature (d) Tension – Temperature
62. What is the reason of electrical energy transmission at high voltage ?
(a) To reduce iron loss (b) To reduce copper loss
(c) To transfer power at high current (d) To reduce hysteresis loss
63. kVAR is equal to
(a) kW tan (b) kW sin (c) kW cos (d) kW
64. The power factor improvement equipment is always placed
(a) at the generating station
(b) near the transformers
(c) near the apparatus responsible for low power factor
(d) near bus bars
65. Which of the following frequency is not common in low-frequency traction system ?
2
(a) 25 Hz (b) 16 Hz (c) 40 Hz (d) None of these
3
66. In which of the following models of transmission line, full charging current is assumed to
flow over half of the length of the line ?
(a) nominal - T (b) nominal - (c) equivalent - (d) medium length line
67. Damping Torque is provided in
(a) Indicating Instruments (b) Recording Instruments
(c) Integrating Instruments (d) Digital Instruments
68. Internal Resistance of voltmeter is
(a) zero (b) very small (c) very high (d) infinity
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69. To extend the range of an ammeter,
(a) put a low resistance in series with it.
(b) put a low resistance in parallel with it.
(c) put a high resistance in series with it.
(d) put a high resistance in parallel with it.
70. Creeping phenomenon occurs in
(a) Ammeter (b) Voltmeter (c) Wattmeter (d) Energy Meter
71. _________ measures temperature.
(a) Thermistor (b) Piezoelectric transducer
(c) Photoelectric transducer (d) LVDT
72. Which of the following instrument has non-uniform scale ?
(a) PMMC type (b) Moving Iron type
(c) Induction type (d) Electrodynamo type
73. The power of a n-phase circuit can be measured by using a minimum of ______ wattmeters.
(a) n (b) (n + 1)
(c) (n – 1) (d) 2n
74. Inductive transducers are used in differential configuration so that output is not influenced by
(a) speed (b) pressure change
(c) resistance (d) external magnetic field
75. In a Dynamometer type wattmeter, pressure coil connected across the load terminal is highly
(a) capacitive (b) inductive (c) resistive (d) conductive
76. With the increase in intensity of light, the resistance of photovoltaic cell
(a) decreases. (b) increases. (c) remains same. (d) becomes zero.
77. Role of Swamping Resistor in Moving Coil Meter is to
(a) reduce the frequency error (b) reduce the temperature error
(c) reduce the friction (d) increase the damping
78. A strain gauge is a/an
(a) inductive transducer (b) capacitive transducer
(c) resistive transducer (d) chemical transducer
79. In electrodynamic instruments, the operating field is produced by
(a) Fixed Coil (b) Moving Coil (c) Permanent Magnet (d) None of these
80. Which of the following is most sensitive detector for single frequency value ?
(a) Head phone (b) Oscillator
(c) Vibration Galvanometer (d) Tuned Detector
81. Hot wire Instruments read
(a) RMS value (b) Peak value (c) Average value (d) Instantaneous value
82. In an Inductive type meter, maximum torque is produced, when the phase angle between
two fluxes is
(a) 180 (b) 90 (c) 45 (d) 30
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69.
(a) (b) (parallel)
(c) (d) (parallel)
70. (creeping)
(a) (b) (c) (d)
71. _____
(a) (b)
(c) (d) ....
72. ?
(a) .... (b)
(c) (d)
73. n- _____
(a) n (b) (n + 1) (c) (n – 1) (d) 2n
74. ,
(a) (b) (c) (d)
75. (pressure coil)
(a) (b) (inductive)
(c) (resistive) (d) (conductive)
76. (photovoltaic) (cell)
(a) (b) (c) (d)
77. (Moving Coil Meter) (swamping resistor)
(a) (b)
(c) (d)
78.
(a) (b)
(c) (d)
79. (electrodynamic) , (operating field) _____
(a) (b) (c) (d)
80. , ?
(a) (b) () (c) (d)
81.
(a) RMS (b) (c) (d)
82. (flux) (phase)
(a) 180 (b) 90 (c) 45 (d) 30
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83. Sphere gaps are used for measurement of
(a) instantaneous values of voltage (b) rms values of voltage
(c) average values of voltage (d) peak values of voltage
84. Murray–loop test can be used for identification of location of
(a) ground faults in cable (b) short circuit faults in cable
(c) both (a) and (b) (d) None of these
85. In order to have high accuracy, slide wire of a potentiometer should be
(a) as long as possible (b) as short as possible
(c) as thick as possible (d) None of these
86. For measurement of mutual inductance, we can use
(a) Anderson’s Bridge (b) Heaviside’s Bridge
(c) Maxwell’s Bridge (d) Schering Bridge
87. Rectifier Instrument is not free from
(a) Temperature error (b) Wave shape error
(c) Frequency error (d) None of these
88. A digital linear displacement transducer normally uses
(a) Straight Binary Code (b) BCD
(c) Hexadecimal Code (d) Gray Code
89. Find Vo/Vi of following :
A (1 + AB) B (1 + AB)
(a) (b) (c) (d)
(1 + AB) A (1 + AB) B
90. Transfer function of a system is the Laplace transform of its
(a) Step Response (b) Impulse Response
(c) Frequency Response (d) All of these
91. High speed alternators use _________ type of rotor.
(a) Salient Pole (b) Cylindrical (c) Any one of (a) & (b) (d) None of these
92. In a 3-phase, 4-wire unbalanced system, the magnitude of zero sequence current is ________
of the current in neutral wire.
(a) one time (b) three times (c) one third times (d) half times
93. If the fault current is 1 kA, the relay setting is 50% and the CT ratio is 400/5, then the plug
setting multiplier will be
(a) 25 (b) 15 (c) 50 (d) 10
94. The most suitable circuit breaker for short line fault without switching resistor is
(a) Air Blast Circuit Breaker (b) Minimum Oil Circuit Breaker
(c) SF6 Circuit Breaker (d) Air Break Circuit Breaker
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83. (Sphere Gaps) _____
(a) (b) ...
(c) (d) (peak)
84. - (Murray-loop) :
(a) (b)
(c) (a) (b) (d)
85. , (potentiometer) (slide) _____
(a) (b) (c) (d)
86. ,
(a) (b) (c) (d)
87. :
(a) (b) (c) (d)
88. , :
(a) (b) ... (c) (d)
89. Vo/Vi :
A (1 + AB) B (1 + AB)
(a) (b) (c) (d)
(1 + AB) A (1 + AB) B
90. (Transfer Function) _____
(a) ( ) (b) ( )
(c) ( ) (d)
91. _____
(a) (b)
(c) (a) (b) (d)
92. -, 4- , ,
_____
(a) (b) (c) (d)
93. 1 kA, 50% , CT 400/5 ,
(a) 25 (b) 15 (c) 50 (d) 10
94. , ,
(a) (b)
(c) SF6 (d)
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95. Auto-reclosing is used in the case of
(a) Lightning Arrester (b) Air Blast Circuit Breaker
(c) Bulk Oil Circuit Breaker (d) Minimum Oil Circuit Breaker
96. The resultant transient voltage, which appears across the breaker contacts at the instant of
arc extinction, is called
(a) Restriking voltage (b) Recovery voltage
(c) R.R.R.V. (d) Prospective voltage
97. The design of insulation for system above 400 kV is based upon
(a) lightning over voltage (b) switching surges
(c) system voltage level (d) system load level
98. Which of the following is a balanced fault ?
(a) L G fault (b) LL fault (c) LL G fault (d) LLL G fault
99. What is the other name of Merz-Price current protection ?
(a) Over current protection (b) Overload protection
(c) Differential protection (d) Distance protection
100. Which of the following is a voltage restrained over current relay ?
(a) Impedance relay (b) Reactance relay
(c) Mho relay (d) Induction type over current relay
101. The Breaking capacity of a circuit breaker is usually expressed in terms of
(a) Amperes (b) Volts (c) MW (d) MVA
102. A certain cable has an insulation of relative permittivity 2. If the insulation is replaced by
one having relative permittivity 4, then new capacitance of cable is ______ as compared to
old capacitance.
(a) doubled (b) halved (c) unchanged (d) three times
103. The location of lightning arrester is
(a) near the transformer (b) away from the transformer
(c) near the circuit breaker (d) away from the circuit breaker
104. Which is the most serious problem in vacuum circuit breaker ?
(a) Poor arc quenching (b) Low thermal stability
(c) Current chopping (d) Large size
105. The Dielectric strength of SF6 is _________ that of the Air.
(a) same as (b) 2 to 3 times (c) 5 to 6 times (d) 10 times
106. The making capacity of circuit breaker is given by following equation :
(a) 1.88 symmetrical breaking capacity (b) 2.55 symmetrical breaking capacity
(c) 3.87 symmetrical breaking capacity (d) 10 symmetrical breaking capacity
107. What material is used for manufacturing of brushes in DC motors ?
(a) Graphite (b) Lead (c) Copper (d) Silver
108. At what angle difference is the main winding and auxiliary winding separated in a split-
phase capacitor start induction motor ?
(a) 45 mechanical (b) 45 electrical (c) 90 mechanical (d) 90 electrical
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95. - _____ (case)
(a) (b)
(c) (d)
96. , ,
(a) (b) (c) .... (d)
97. 400 kV
(a) (b)
(c) (d)
98. ?
(a) L G (b) LL (c) LL G (d) LLL G
99. - ?
(a) (b)
(c) (Differential) (d)
100. (Restrained) ?
(a) (b)
(c) (d)
101. :
(a) (b) (c) MW (d) MVA
102. 2 4
(a) (b)
(c) (d)
103.
(a) (b)
(c) (d)
104.
(a) (b) (c) (d)
105. SF6 , _____
(a) (b) 2 3 (c) 5 6 (d) 10
106. , :
(a) 1.88 (b) 2.55
(c) 3.87 (d) 10
107. ,
(a) (b) (c) (d)
108. - ,
(a) 45 (b) 45 (c) 90 (d) 90
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109. What is the voltage characteristic of a differential compound dc motor ?
(a) Exponential (b) Flat (c) Dropping (d) Rising
110. The earth electrode (Plate or pipe) should be kept
(a) vertical (b) horizontal
(c) Any position does not matter (d) None of these
111. Which gel ensures the dryness of incoming air in breather ?
(a) Potassium gel (b) Silica gel (c) Carbon gel (d) Silver gel
112. In Back-to-Back Test, two transformers should
(a) have matching voltage ratio (b) have center tapping
(c) be identical (d) be connected in series
113. Class-B insulating material can withstand temperature up to
(a) 190 C (b) 90 C (c) 105 C (d) 130 C
114. Which of the following IE Rule stands for “Danger Notices” ?
(a) IE Rule 35 (b) IE Rule 30 (c) IE Rule 45 (d) IE Rule 43
115. Which of the following is not a characteristic of a radial distribution system ?
(a) Power flows in one direction only. (b) Highly reliable
(c) Low cost (d) Simple construction
116. In the case of a three core flexible cable, the colour of neutral is
(a) Black (b) Brown (c) Green (d) Blue
117. The current in a transmission line under no-load conditions is due to
(a) Spinning reserve (b) Corona effects
(c) Capacitance of the line (d) Back flow from earth
118. Fleming’s Right Hand rule is used to find the following :
(a) Direction of rotation (b) Direction of flux
(c) Direction of emf (d) Direction of torque
119. Sumpner’s Test is carried out in transformers
(a) mainly to find out the temperature rise on full load
(b) to identify polarity
(c) to find out hysteresis loss
(d) to know maximum load
120. The purpose of an open circuit test in a transformer is
(a) to determine full load copper loss (b) to determine shunt branch parameters
(c) to determine equivalent resistance (d) to determine equivalent reactance
121. The distributors for residential areas are
(a) single phase (b) three phase – three wire
(c) three phase – four wire (d) six phase
122. Which motor is used for power factor improvement ?
(a) Induction motor (b) Under excited synchronous motor
(c) DC series motor (d) Over excited synchronous motor
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Text of page 19
109. () ..
(a) () (b)
(c) (d)
110. - ( )
(a) (b)
(c) (d)
111. ?
(a) (b) (c) (d)
112. -- ,
(a) (b)
(c) (d)
113. - ?
(a) 190 C (b) 90 C (c) 105 C (d) 130 C
114. IE “ ” ?
(a) IE 35 (b) IE 30 (c) IE 45 (d) IE 43
115. ?
(a) (b)
(c) (d)
116. ,
(a) (b) (c) (d)
117. , ?
(a) (b) (c) (d)
118. :
(a) (b) (c) ... (d)
119.
(a)
(b)
(c)
(d)
120.
(a) (b)
(c) (d)
121.
(a) - (b) - (c) - (d) :
122. ?
(a) (b)
(c) .. (d)
EEE 19 Series-A
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123. Which of the following is a commonly used material in solar cells ?
(a) Germanium (b) Silicon (c) Aluminium (d) Copper
124. Which of the following fuel has lowest calorific value ?
(a) Lignite (b) Petrol (c) Diesel oil (d) Anthracite Coal
125. A tidal barrage is a barrier built over a
(a) River bed (b) River end (c) River start (d) River estuary
126. What does Ozone protect the earth from ?
(a) Sound waves (b) Visible radiation
(c) Harmful UV radiation (d) X-rays
127. Reciprocal of reluctance in a magnetic circuit is
(a) Resistance (b) Permeance (c) Admittance (d) Conductance
128. Biogas contains mainly
(a) Methane (b) Butane (c) Propane (d) Carbon Dioxide
129. A fuel cell in order to produce electricity burns
(a) Hydrogen (b) Nitrogen (c) Helium (d) Carbon
130. In Energy management system, monitoring and control is done by
(a) MATLAB (b) SCADA (c) AUTOCAD (d) None of these
131. Co-generation refers to
(a) generating power from small multiple power plants
(b) generating power and supplying spare power to grid
(c) electrical power generation and useful heat generation
(d) All of these
132. Which of the following is a bi-directional current device ?
(a) GTO (b) IGBT (c) MOSFET (d) TRIAC
133. The gate of an SCR is _________ with respect to its cathode.
(a) positive (b) at zero potential (c) negative (d) at infinite potential
134. A Diac has
(a) One p-n junction, 2 terminals (b) Three p-n junctions, 2 terminals
(c) Two p-n junctions, 2 terminals (d) Three p-n junctions, 3 terminals
135. An SCR is a ________ triggered device.
(a) Current (b) Voltage (c) Power (d) Noise
136. To turn off the SCR, which of the following is done ?
(a) Reduce gate voltage to zero. (b) Positive bias the gate.
(c) Reduce anode current to nearly zero. (d) Reduce cathode voltage to zero.
137. The maximum rectification efficiency of a half-wave rectifier is
(a) 88% (b) 81.2% (c) 56.3% (d) 40.5%
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Text of page 21
123. ?
(a) (b) (c) (d)
124. ?
(a) (b) (c) (d) -
125. _____
(a) (b)
(c) (d) (estuary)
126. ?
(a) (b)
(c) .. (d) X-rays
127. ()
(a) (b) () (c) () (d) ()
128.
(a) (b) (c) (d)
129. ,
(a) (b) (c) (d)
130. ,
(a) MATLAB (b) SCADA (c) AUTOCAD (d)
131. -
(a) -
(b)
(c)
(d)
132. - ?
(a) GTO (b) IGBT (c) MOSFET (d) TRIAC
133. SCR , _____
(a) (b) (c) (d)
134.
(a) .. , (b) .. ,
(c) .. , (d) .. ,
135. SCR _____ (device)
(a) (b) (c) (d)
136. SCR , ?
(a) (b)
(c) (d)
137. - (rectification)
(a) 88 (b) 81.2 (c) 56.3 (d) 40.5
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138. Cycloconverters used in AC motor speed control provide ________ frequency power from
a _________ input frequency power.
(a) variable, variable (b) variable, fixed
(c) fixed, fixed (d) fixed, variable
139. The output of SMPS is ________.
(a) Pulsating DC (b) Voltage sweep (c) AC (d) DC
140. Which one of the following is a quality measure of power output of a power supply ?
(a) Ripple factor (b) Knee voltage (c) Regulation (d) Rectification
141. Snubber circuits are used with thyristor for
(a) turning ON SCR at a voltage much less than its forward breakover voltage
(b) protecting the gate circuit
(c) limiting the rate of rise of voltage dV/dt
(d) limiting the rate of rise of current di/dt
142. In electric traction system, Kando system is used for
(a) conversion of 3-phase AC into DC
(b) conversion of 1-phase supply into 3-phase supply
(c) conversion of single phase AC supply into DC
(d) conversion of DC to DC
143. Which of the following method of heating is independent of supply frequency ?
(a) Electric Resistance Heating (b) Eddy Current Heating
(c) Induction Heating (d) Capacitance Heating
144. Galvanising is coating of
(a) Aluminium (b) Brass (c) Lead (d) Zinc
145. A good heating element should have
(a) low resistivity and low melting point (b) high resistivity and low melting point
(c) high resistivity and high melting point (d) low resistivity and high melting point
146. For regenerative braking, the motor which is not suitable is __________.
(a) DC Shunt Motor (b) DC Series Motor
(c) DC Compound Motor (d) AC Shunt Motor
147. A solid angle is expressed in terms of
(a) Steradians (b) Radians (c) Degree (d) Radian/Metre
148. Radiant heat emitted from a Black Body is proportional to
(Where T is Absolute Temperature)
(a) T (b) T2 (c) T3 (d) T4
149. Dielectric Heating is used for heating of _______ materials.
(a) Ferrous (b) Non-ferrous (c) Semiconductor (d) Insulating
150. The material best suited for manufacturing a fuse is
(a) Silver (b) Copper (c) Aluminium (d) Zinc
151. Tungsten filament lamp contains
(a) Methane (b) Oxygen (c) Argon (d) CO2
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Text of page 23
138. .. , _____ ,
_____
(a) , (b) , (c) , (d) ,
139. .... (output)
(a) .. (b) (c) .. (d) ..
140. , ?
(a) (b) (Knee)
(c) (d) (rectification)
141. (snubber)
(a) SCR
(b)
(c) dV/dt
(d) di/dt
142. ,
(a) .. ..
(b)
(c) .. ..
(d) .. ..
143. (Heating) , ?
(a) (b)
(c) (d)
144.
(a) (b) (Brass) (c) (lead) (d) (Zinc)
145.
(a) (b)
(c) (d)
146. (regenerative braking)
(a) .. (b) .. (c) .. (d) ..
147. :
(a) (b) (c) (d) /
148. ( T ) :
(a) T (b) T2 (c) T3 (d) T4
149. _____
(a) (b) - (c) (d)
150.
(a) (b) (Copper) (c) (d) (Zinc)
151.
(a) (b) (c) (d) CO2
EEE 23 Series-A
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152. With the increase of reverse-bias in a p-n diode, the reverse current
(a) decreases.
(b) increases.
(c) remains constant.
(d) may increase or decrease depending upon doping.
153. In a semiconductor diode, cut-in voltage is the voltage
(a) up to which the current is zero in forward bias.
(b) up to which the current is very small in forward bias.
(c) at which the current is 10% of maximum rated current in reverse bias.
(d) at which depletion layer is formed.
154. A transistor connected in a common base configuration has the following readings :
IE = 2 mA and IB = 20 A. Find the current gain .
(a) 0.95 (b) 1.98 (c) 0.98 (d) 0.99
155. CMRR for an Op-amp should be
(a) as large as possible (b) close to zero
(c) close to unity (d) as small as possible
156. The Schmitt Trigger circuit is a modification of which of the following multivibrators ?
(a) Universal Multivibrator (b) Astable Multivibrator
(c) Bistable Multivibrator (d) Monostable Multivibrator
157. The gain of negative feedback amplifier with internal gain A = 100 and feedback fraction
m = 0.09 is
(a) 100 (b) 10 (c) 9 (d) 1
158. Intrinsic concentration of charge carriers in semiconductors varies as
(where T : Absolute Temperature)
(a) T (b) T2 (c) T3/2 (d) T–1
159. The reverse saturation current in a Germanium Diode is of the order of
(a) 10 A (b) 0.01 A (c) 1 nA (d) 1 mA
160. The Early effect in a Bipolar Junction Transistor (BJT) is caused by
(a) fast turn-on (b) fast turn-off
(c) large collector-base reverse bias (d) large emitter-base forward bias
161. The approximate ratio of impurity atoms to intrinsic semiconductor atoms in an extrinsic
semiconductor is about
(a) 1 : 108 (b) 1 : 1 (c) 1 : 10 (d) 1 : 1000
162. If a three stage amplifier has individual stage gains of 10 dB, 5 dB and 12 dB, then total gain
in dB is
(a) 27 dB (b) 24 dB (c) 14 dB (d) 600 dB
163. Which coupling technique offers best frequency response having minimum interference ?
(a) RC (b) Direct (c) Transformer (d) None of these
164. What pin number is assigned for output in IC 741 ?
(a) 4 (b) 5 (c) 6 (d) 7
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165. An ideal op-amp has
(a) infinite input impedance and infinite output impedance
(b) very low input impedance and very low output impedance
(c) very low input impedance and infinite output impedance
(d) infinite input resistance and zero output impedance
166. Closed loop gain of following op-amp circuit is given by :
(a) – Rf/R1 (b) + Rf/R1 (c) – Rf/R2 (d) + Rf/R2
167. Convert the following :
(2AC5.D)16 = ( )8
(a) 1261.35 (b) 2405.35 (c) 25305.64 (d) 1254.35
168. The figure of Merit of a logic family is given by
(a) Gain Bandwidth (b) Propagation delay time Power dissipation
(c) Fan out Propagation delay time (d) Noise margin Power dissipation
169. Characteristic equation of T-flip flop is
– –– – – –
(a) Q+ = TQ (b) Q+ = TQ (c) Q+ = TQ + TQ (d) Q+ = TQ + TQ
170. The Octal equivalent of 1100101.001010 is
(a) 145.12 (b) 145.21 (c) 154.12 (d) 624.21
171. Whose operations are fastest among the following ?
(a) Sequential circuits (b) Combinatorial circuits
(c) Latches (d) Flip flops
172. Which of the following instructions of 8085 microprocessor, compares memory with
accumulator ?
(a) MOV M, A (b) MVIA, FF (c) CMP M (d) None of these
173. Which of these 8-bit registers of 8085 microprocessor can be paired together to make a 16-
bit register ?
(a) Accumulator and B register (b) B and D registers
(c) C and E registers (d) H and L registers
174. The computer program, which converts statements written in high level language into object
code is known as
(a) Assembler (b) Compiler (c) Disassembler (d) Operating system
175. The contents of accumulator in 8085 microprocessor are altered after the execution of the
instruciton
(a) ANI 5 C (b) CMP C (c) CPI 3A (d) ORA A
176. Which type of programming language is typically used to program a PLC ?
(a) Python (b) C++ (c) Java (d) Ladder Logic
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Text of page 27
165. .-. (op.-amp.)
(a) () ()
(b) () ()
(c) () ()
(d) () ()
166. - (closed loop gain) :
(a) – Rf/R1 (b) + Rf/R1 (c) – Rf/R2 (d) + Rf/R2
167. :
(2AC5.D)16 = ( )8
(a) 1261.35 (b) 2405.35 (c) 25305.64 (d) 1254.35
168.
(a) (b)
(c) (d)
169. T - (characteristic equation)
– –– – – –
(a) Q+ = TQ (b) Q+ = TQ (c) Q+ = TQ + TQ (d) Q+ = TQ + TQ
170. 1100101 001010
(a) 145.12 (b) 145.21 (c) 154.12 (d) 624.21
171. ?
(a) (b) (combinatorial)
(c) (d) -
172. 8085 , ?
(a) MOV M, A (b) MVIA, FF (c) CMP M (d)
173. 8085 8- 16- ?
(a) (accumulator) B (b) B D
(c) C E (d) H L
174. , (object code)
,
(a) (assembler) (b)
(c) (d)
175. 8085 (content) ?
(a) ANI 5 C (b) CMP C (c) CPI 3A (d) ORA A
176. ... (PLC)
?
(a) (Python) (b) C++
(c) (Java) (d) (Ladder Logic)
EEE 27 Series-A
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177. Thevenin equivalent resistance at AB of following circuit will be :
(a) 3.33 (b) 10 (c) 5 (d) 15
178. If a capacitor is charged by a square wave current source, the voltage across capacitor will be
(a) step function (b) sine wave (c) square wave (d) triangular wave
179. A capacitor stores energy in
(a) core (b) electromagnetic field
(c) magnetic field (d) electrostatic field
180. The average emf during positive half cycle of an AC supply of peak value E o is
(a) 2 Eo/ (b) Eo/ (c) Eo/ 2 (d) Eo/ 3
181. In a star-connected system, the phase angle difference between line and phase voltage is
(a) 120 (b) 90 (c) 60 (d) 30
182. If 12 resistor draws a current of 1 A in the circuit as shown below, the value of resistance
R will be
(a) 4 (b) 6 (c) 8 (d) 18
183. In a dc circuit, inductor and capacitor respectively behave as
(a) open circuit and short circuit (b) short circuit and open circuit
(c) both elements as short circuit (d) both elements as open circuit
184. For star-delta transformation, which of the following is true ?
RA RC RA RB + RB RC + RC RA
(a) R2 = (b) R2 =
RA + R B + R C RC
RA RB + RB RC + RC RA RA RB + RB RC + RC RA
(c) R2 = (d) R2 =
RB RA
185. The phase voltage of a star-connected three phase circuit is 200 V. The line voltage will be
(a) 230 V (b) 220 V (c) 173.2 V (d) 346.4 V
186. Colour bands for 1.5 resistor will be
(a) Brown, Green, Brown (b) Brown, Green, Golden
(c) Brown, Golden, Green (d) Brown, Golden, Golden
187. Average power in LCR circuit depends upon
(a) current only (b) emf only (c) phase difference only (d) All of these
Series-A 28 EEE
Text of page 29
177. (Thevenin) , AB :
(a) 3.33 (b) 10 (c) 5 (d) 15
178. (source) ,
(a) (step) (b) (sine) (c) (d)
179. , :
(a) (b) - (c) (d)
180. .. , Eo , - (half cycle) ... (emf)
(a) 2 Eo/ (b) Eo/ (c) Eo/ 2 (d) Eo/ 3
181. - (phase angle)
(a) 120 (b) 90 (c) 60 (d) 30
182. , 12 1 A , R :
(a) 4 (b) 6 (c) 8 (d) 18
183. .. : :
(a) (b)
(c) (d)
184. - ?
RA RC RA RB + RB RC + RC RA
(a) R2 = (b) R2 =
RA + R B + R C RC
RA RB + RB RC + RC RA RA RB + RB RC + RC RA
(c) R2 = (d) R2 =
RB RA
185. 200 V :
(a) 230 V (b) 220 V (c) 173.2 V (d) 346.4 V
186. 1.5
(a) , , (b) , , (c) , , (d) , ,
187. LCR
(a) (b) ... (emf)
(c) (d)
EEE 29 Series-A
Text of page 30
188. Quality factor (Q) of a Series Resonant Circuit is given by
1 L C 1 1 R
(a) (b) R (c) (d)
R C L R LC LC
189. If V= Vm sin t is the voltage across a capacitor, then the current is
(a) Im / 2 (b) Im sin t (c) Im sin (t + /2) (d) Im sin (t – /2)
190. A sine wave has a maximum value of 20 V, its value at 135 is
(a) 10 V (b) 14.14 V (c) 15 V (d) 5 V
191. The form factor of a _________ wave is 1.
(a) Saw Tooth (b) Triangular (c) Sinusoidal (d) Square
192. In a purely resistive circuit, reactive kVAR will be
(a) zero (b) one (c) more than one (d) infinity
193. The maximum power that can be delivered to the load in the circuit below is
(a) 3 W (b) 6 W (c) 6.75 W (d) 13.5 W
194. In series Resonance circuit, the power factor at resonance is
(a) 0 (b) 0.5 (c) 0.707 (d) 1.0
195. At a particular instant, an inductance of 2 H carries a current of 2 A, while the voltage across
it is 1 V. The energy stored in inductor in Joules is
(a) 1 (b) 2 (c) 4 (d) 8
196. Find the voltage of the dependent source in the given circuit.
(a) 8 V (b) 12 V (c) 6 V (d) 16 V
197. Internal resistance of an ideal current source is always
(a) unity (b) zero (c) infinity (d) can be any value
198. Kirchhoff’s current law is based on principle of
(a) Conservation of charge (b) Conservation of voltage
(c) Both (a) and (b) (d) Conservation of time
199. The value of in the given circuit is
(a) 2 V (b) 12 V (c) –2 V (d) –12 V
200. Under maximum power transfer condition, power transfer efficiency is
(a) 66% (b) 33% (c) 100% (d) 50%
_____________
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Text of page 31
188. (Series Resonant Circuit) , (Q) :
1 L C 1 1 R
(a) (b) R (c) (d)
R C L R LC LC
189. V= Vm sin t ,
(a) Im / 2 (b) Im sin t (c) Im sin (t + /2) (d) Im sin (t – /2)
190. 20 V 135
(a) 10 V (b) 14.14 V (c) 15 V (d) 5 V
191. _________ 1
(a) (b) (c) (d)
192. (reactive) kVAR
(a) (b) (c) (d)
193. , (load) :
(a) 3 W (b) 6 W (c) 6.75 W (d) 13.5 W
194. , , (Power Factor)
(a) 0 (b) 0.5 (c) 0.707 (d) 1.0
195. , 2 H , 2 A 1 V (Inductor)
(a) 1 (b) 2 (c) 4 (d) 8
196. -
(a) 8 V (b) 12 V (c) 6 V (d) 16 V
197. _____
(a) (unity) (b) (c) (d)
198. _____
(a) (b) (c) (a) (b) (d)
199.
(a) 2 V (b) 12 V (c) – 2 V (d) – 12 V
200. ,
(a) 66% (b) 33% (c) 100% (d) 50%
_____________
EEE 31 Series-A
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Space For Rough Work / Series-A 32 EEE
Page 1 of 32
Source: Uttarakhand Public Service Commission. Question paper published by Uttarakhand Public Service Commission.