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1. Diffusion current in p-n junction greater than drift current if:

A

Forward biased

B

Reverse biased

C

Unbiased

D

None

2. Hall effect principle applied in: 1. Magnetic field sensing 2. Current measurement 3. Hall effect sensors 4. Linear/angular displacement. Which are correct?

A

1,2

B

2,3

C

1,2,3

D

1,2,3,4

3. Match List-I (Materials) with List-II (Type): i. Copper ii. Silicon iii. Silicon+P iv. Silicon+Al. Types: 1. Conductor 2. P-type 3. N-type 4. Intrinsic. Choose correct.

A

(i)-1, (ii)-4, (iii)-3, (iv)-2

B

(i)-2, (ii)-3, (iii)-1, (iv)-4

C

(i)-3, (ii)-2, (iii)-1, (iv)-4

D

(i)-4, (ii)-1, (iii)-2, (iv)-3

4. Energy bands: completely filled bands = __, bands with higher energies = __.

A

Conduction, valence

B

Valence, conduction

C

Valence, drift

D

None

5. Modulator stage in radio transmitter normally?

A

Class-C Amplifier

B

Class-B push-pull Amplifier

C

Class-A Amplifier

D

Class-D Amplifier

6. In television, 4:3 represents?

A

Interlace Ratio

B

Max Horizontal Deflection

C

Aspect Ratio

D

Diagonal Ratio

7. In T.V., the picture signal is

A

Amplitude modulated and at the low-frequency end of each channel allocation

B

Frequency modulated and at the low-frequency end of each channel allocation

C

Amplitude modulated and at the high frequency end of each channel allocation

D

None of the above

8. A PAM signal can be demodulated using

A

High pass filter

B

Band pass filter

C

Low pass filter

D

None of the above

9. In time-division multiplexing, each multiplexed signal occupies

A

A Fraction of Transmission Bandwidth

B

The Entire Transmission Bandwidth

C

A Bandwidth equal to each input signal

D

None of the above

10. Upper and lower sideband for AM of 35 kHz with 5 kHz carrier?

A

42.5 kHz & 37.5 kHz

B

45 kHz & 35 kHz

C

50 kHz & 30 kHz

D

25 kHz & 15 kHz

11. FM to AM conversion: input of FM signal converted into amplitude signal by

A

Differentiator

B

Integrator

C

Demodulator

D

None of the above

12. Pulse amplitude modulation is a process whereby

A

Position of pulse is changed

B

Width of pulse varies

C

Height of pulse ? sampled value

D

None of the above

13. Amplitude modulation signal without carrier is known as

A

SSB-SC

B

DSB-SC

C

Both A & B

D

None

14. Incorrect statement about SMPS

A

Less sensitive to input variations

B

Smaller size compared to rectifiers

C

Has low input ripple

D

Source of radio interference

15. Common use of Band Pass Filter in Radio?

A

Allows specific range

B

Allows all

C

Blocks all

D

Amplifies all

16. What is the transmission frequency range of FM radio?

A

28-56 MHz

B

88-108 MHz

C

58-88 MHz

D

108-128 MHz

17. In AM, modulation index should be high because?

A

Both statements true

B

Both individually true but II not explanation of I

C

I true, II false

D

I false, II true

18. Correct sequence of subsystems in FM receiver?

A

Mixer-RF-Limiter-IF-Discriminator-Audio

B

RF-Mixer-Limiter-Discriminator-IF-Audio

C

RF-Amplifier-Mixer-IF-Amplifier-Limiter-Discriminator-Audio Amplifier

D

Mixer-IF-Amplifier-Limiter-Audio-Discriminator

19. NOT a method for generating FM?

A

Varactor diode

B

Reactance modulator

C

Armstrong modulator

D

By-pass modulator

20. Which mode uses reflecting surface of ionosphere?

A

Ground wave

B

Space wave

C

Sky wave

D

LOS wave