Communication Skill MCQs and Notes

R

Ram Sharma • 193.84K Points
Coach

Q 1. One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

(A) improved efficiency

(B) better linearity

(C) high power output per transistor

(D) the lower modulating power requirement

V

Vijay Sangwan • 28.62K Points
Instructor II

Q 2. The direction of rotation of a CD is

(A) clockwise

(B) anticlockwise

(C) clockwise or anticlockwise depending on frequency of data stored

(D) mostly anticlockwise but some times clockwise

V

Vinay • 28.75K Points
Instructor II

Q 3. Leak type bias is used in plate modulated class C amplifier to

(A) increase the bandwidth

(B) prevent over modulation

(C) prevent excessive grid current

(D) prevent tuned circuit damping

V

Vijay Sangwan • 28.62K Points
Instructor II

Q 4. A buffer amplifier is

(A) a double-tuned amplifier

(B) a high gain d.c. amplifier

(C) a cathode follower stage

(D) none of the above

V

Vinay • 28.75K Points
Instructor II

Q 5. In a FM receiver, amplitude limiter

(A) amplifiers low frequency signals

(B) reduces the amplitude of signals

(C) eliminates any change in amplitude of received fm signals

(D) none of the above

V

Vikash Gupta • 33.56K Points
Instructor I

Q 6. The characteristic impedance of a twin wire feeder used for TV signals is about

(A) 1000 ohm

(B) 500 ohm

(C) 300 ohm

(D) 100 ohm

V

Vijay Sangwan • 28.62K Points
Instructor II

Q 7. PAM stands for

(A) pulse analogue modulation

(B) phase analogue modulation

(C) pulse amplitude modulation

(D) phase amplitude modulation

G

Gopal Sharma • 38.32K Points
Coach

Q 8. The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

(A) 0.5 kw

(B) 8 kw

(C) 20 kw

(D) 50 kw

R

Ranjeet • 34.60K Points
Instructor I

Q 9. In EM waves, polarization

(A) is always vertical in an isotropic medium

(B) is caused by reflection

(C) is due to transverse nature of waves

(D) results from longitudinal nature of waves

G

Gopal Sharma • 38.32K Points
Coach

Q 10. In practical commercial FM system, channel bandwidth is

(A) 150 khz

(B) 100 khz

(C) 88 mhz

(D) 108 mhz