Discussion
Indicate the false statement.
(i) HF mixers are generally noiser than HF amplifier.
(ii) Impulse noise voltage is independent of bandwidth.
(iii) In thermal noise, the noise power generated by a resistor, is proportional to the bandwidth.
(iv) Industrial noise is not an impulse type.
Answer: D
The statements that are correct are (i) and (iii), and the options are worded as 'are correct', so the key picks them. Statement (i), that HF mixers are generally noisier than HF amplifiers, is true because a mixer is a non-linear device that adds more noise than an amplifier. Statement (iii), that the thermal noise power from a resistor is proportional to the bandwidth, is true from the relation P = kTB. Statement (ii) is false: impulse noise voltage is proportional to the bandwidth, so it is not independent of it. Statement (iv) is also false, because industrial noise, from ignition, motors and switches, is of the impulse type. The answer is (i) and (iii).
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