IndiaBIX

Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 5
26.
The video heads, in VCR, feed the other circuit
directly windings
through a transformer having two rotating windings
through a transformer having two stationary windings
through a transformer having one stationary and one rotatory winding
Answer: Option
Explanation:

Rotatory transformer, in VCR, has one stationary and one rotating winding.

27.
A high pulse repetition frequency in a radar
increases the maximum range
decreases the maximum range
has no effect on the maximum range
either (a) or (b) depending on other factors
Answer: Option
Explanation:

PRF does not have any effect on range of radar.

28.
In PCM, the biggest disadvantage as compared to AM is
larger bandwidth
larger noise
inability to handle analog signals
incompatibility with time division multiplex systems
Answer: Option
Explanation:

PCM requires large bandwidth.

29.
Which of the following microphones is the cheapest?
Moving coil
Condenser
Ribbon
Carbon
Answer: Option
Explanation:

Carbon microphone has the least cost.

30.
When the carrier is unmodulated, a certain transmitter radiates 9 kW when the carrier is sinusoidally modulated the transmitter radiates 10.125 kW. The modulation index will be
0.1
10.15
0.4
0.5
Answer: Option
Explanation:

.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers