Top 150+ Solved Communication Skill MCQ Questions Answer
Q. 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
Q. 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
Q. 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
Q. 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
Q. 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
Q. 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
Q. In a TV receiver antenna the length of reflector rod.
a. is the same as that of dipole
b. is less than that of dipole
c. is more than that of dipole
d. may be equal, more or less than that of dipole
Q. The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?
a. gets halved
b. gets doubled
c. gets increased by 50 percent
d. remains unchanged
Q. In TV systems, equalising pulses are sent during
a. horizontal blanking
b. vertical blanking
c. serrations
d. horizontal retrace
Q. The main function of a balanced modulator is to
a. produce balanced modulation of a carrier wave
b. produce 100% modulation
c. suppress carrier signal in order to create a single-sideband or double sideband
d. limit noise picked by a receiver