Question28:-A Yagi antenna in a horizontal plane produces
A:-A broadside pattem
B:-An endfire pattemn
C:-A figure of eight pattemn
D:-None of the above
Correct Answer:- Option-B
Question29:-A problem with class B push pull amplifier is that they usually suffer from
A:-Harmonic distortion
B:-Intermodulation distortion
C:-Cross-over distortion
D:-None of these
Correct Answer:- Option-C
Question30:-A 12 bit binary number has an accuracy equivalent to the decimal fraction
‏4ھ‎
‎8.8
‎C:-1/6400
‎D:-1/4096
‎Correct Answer:- Option-D
Question31:-If a pulse train with a frequency of 10 KHz is applied to the trigger input of a bistable multivibrator, the
frequency of the output pulse train would be
கதய
8:20 KHz
C:-10 KHz
D:-None of these
Correct Answer:- Option-A
Question32:-Six independent low pass signals of bandwith 3 W, W, W, 2W, 3W and 2W Hz are to be time division
multiplexed on a common channel using PAM. To achieve this, the minimum transmission bandwidth of the channel should
be Hz.
A-12W
B:-6W
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0:-24 ४४
Correct Answer:- Option-A
Question33:-Class a amplifiers are characterised by
A:-Maximum efficiency and minimum distortion
B:-Minimum efficiency and maximum distortion
C:-Maximum efficiency and maximum distortion
D:-Minimum efficiency and minimum distortion
Correct Answer:- Option-D

Question34:-From cricuit design simplicity and economy point of view, one of the following configurations for a converter is
the best. Which is that 7

A:-Push-pull DC-DC converter using one transformer
B:-Ringing choke converter
C:-Push-pull converter using two transformers
D:-None of these
Correct Answer:- Option-B
Question35:-An op-amp is having is having an open loop gain of “10~(5)" and open loop upper cutoff frequency of 10 Hz. If
this op-amp is connected as an amplifier with a closed loop gain at 100, then the new upper cutoff frequency will be
A:-10 Hz
B:-100 Hz
C:-10 KHz
D:-100 KHz
Correct Answer:- Option-C
Question36:-An amplifier power level is changed from 8 Watts to 16 Watts, equivalent dB gains is
A:-2 dB
B:-3dB
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‎0:-5 8
Correct Answer:- Option-C
Question37:-Which of the following statements are comrect for the basic transistor amplifier configurations