BPSC AE 2025: Assistant Engineer (Civil/Mechanical/Electrical) (Advt. 31/2025), Paper V Electrical Engineering

Bihar Public Service Commission
   Advt. No. 31/2025, Electrical Engineering, Paper-V
           Exam Date: 19-07-2025, 1st Shift
               Final Answer Key (Set – I)
Question No.    Ans. Key      Question No.     Ans. Key
     1              C               26             C
     2              B               27             A
     3              C               28             B
     4              D               29             A
     5           Deleted            30             B
     6              D               31             A
     7              D               32             C
     8              B               33             A
     9              A               34             B
     10             A               35             C
     11             B               36             D
     12             B               37             D
     13             C               38             B
     14             C               39             A
     15          Deleted            40             D
     16             A               41             A
     17             A               42             D
     18             A               43             A

Question No.   Ans. Key      Question No.   Ans. Key
    19            B               44           A
    20            C               45           A
    21            B               46           A
    22            C               47           B
    23            D               48           A
    24            C               49           B
    25            C               50           A


                      (Set – J)
Question No.   Ans. Key      Question No.   Ans. Key
     1         Deleted            26           D
     2            B               27           D
     3            A               28           C
     4            A               29           C
     5            D               30           D
     6            A               31           C
     7            D               32           D
     8            A               33           A
     9            B               34           D
    10            B               35           A
    11            C               36           D
    12            B               37           A
    13            C               38           B
    14            D               39           D

Question No.   Ans. Key      Question No.   Ans. Key
    15            B               40           C
    16            C               41           A
    17            C               42           A
    18            B               43           C
    19            C               44           D
    20            A               45           D
    21            D               46           A
    22            C               47           A
    23         Deleted            48           D
    24            D               49           B
    25            C               50           D


                      (Set – K)
Question No.   Ans. Key      Question No.   Ans. Key
     1            B               26           A
     2            D               27           B
     3         Deleted            28           C
     4            B               29           B
     5            D               30           D
     6            B               31           C
     7            A               32           B
     8            B               33           B
     9            A               34           A
    10            C               35           B

Question No.   Ans. Key      Question No.   Ans. Key
    11            A               36           B
    12            D               37           C
    13            A               38           B
    14            C               39           B
    15            A               40           B
    16         Deleted            41           D
    17            A               42           B
    18            B               43           D
    19            B               44           D
    20            D               45           D
    21            C               46           A
    22            C               47           C
    23            D               48           A
    24            C               49           A
    25            B               50           D


                      (Set – L)
Question No.   Ans. Key      Question No.   Ans. Key
     1         Deleted            26           D
     2            D               27           D
     3            B               28           B
     4            C               29           A
     5            C               30           A

Question No.            Ans. Key           Question No.           Ans. Key
           6                   D                    31                   C
           7                   C                    32                   A
           8                   D                    33                   B
           9                   B                    34                   B
          10                   B                    35                   A
          11                   A                    36                   A
          12                   C                    37                   C
          13                   B                    38                   D
          14                   C                    39                   A
          15                   C                    40                   C
          16                   C                    41                   C
          17                   D                    42               Deleted
          18                   C                    43                   A
          19                   B                    44                   B
          20                   B                    45                   C
          21                   D                    46                   B
          22                   D                    47                   D
          23                   C                    48                   A
          24                   C                    49                   C
          25                   C                    50                   D
                           Reason as per Set-I
Q.No.- 05- Deleted.
Reason :- A, B & D (Multiple Answers are correct so, question is deleted).

Q.No.- 09-   No Change.
Reason :- By connecting a fixed resistance across. (parallel combination)
          thermistor decreases sensitivity & improve linearity.
Q.No.- 10- The Provisional answer is option 'D' but the correct answer is option 'A'.
Reason :- Confidence level =0.95
           Significance level=0.05
           so, The value lying outside the confidence interval occur with a
           probability of 1 in 20.
Q.No.- 15- Deleted.
Reason :- Question is deleted as no choices are correct.
Q.No.- 45- No Change.
Reason :- Time period of Sine wave (T) = =          =

             Sampling rate of DSO is 107 samples/second
               No of samples in time period (T) =            =

Q.No.- 47- The Provisional answer is option 'C' but the correct answer is option 'B'.
Reason :- Permanent magnet material needs high retentivity and coercivity so tall
           & wide hysteresis loop.
Q.No.- 49- The Provisional answer is option 'C' but the correct answer is option 'B'.
Reason :- Constant voltage transformer works on core saturation principle to
           stabilize output.