Electronics Engineer paper set 1 for practice

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Electronics Engineer Paper set 4
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1

The ripple factor in case of a full-wave rectifier is : 


2

Consider the following statements :

1. A differential amplifier is used at the input stage of an operational amplifier

2. Differential amplifiers have very high MRR

Which of these statements are correct? 


3

The maximum efficiency of  a half- wave rectifier is : 


4

If a differential amplifier has a gain of 20,000 and CMRR = 80 dB, its common mode gain is 


5

One of the reasons why vacuum tubes eventually fail at microwave frequencies is that their


6

The seek time of a disk is 30 msec. It rotates at the rate of 30 rotations per second. Each track has a capacity of 300 words. The access time is : 


7

A parametric amplifier is to be cooled : 


8

A waveguide section in microwave circuits will act as a :


9

The waveguide modes are usually excited from a signal source through : 


10

The minimum cut-off frequencies for a rectangular waveguide are obtained when: 


11

For any lossless, reciprocal three port network, one port can be terminated in a reactance so that the other two ports are :


12

 A micro – strip line consists of a single ground plane and a thin strip conductor on a : 


13

Parabolic reflectors use Cassegrain feed to: 


14

A Ruby Maser is preferred to Ammonia Maser for microwave amplification because it has 


15

 Laser is based on the principle of : 


16

Magnetron is a : 


17

 Optical fibers are preferred as communication links for Lasers because they