The velocity of sound waves in air

A)
varies directly as temperature
B)
is constant at all temperatures
C)
varies inversely as absolute temperature
D)
varies directly as square root of absolute temperature

Correct Answer : Option (D) :   varies directly as square root of absolute temperature

Recently Updated in Communication Systems Questions
In TV scanning sequence of lines is
A)
right to left
B)
left to right
C)
left to right for odd fields and right to left for even field
D)
left to right for even fields and right to left for odd field

Correct Answer :   left to right

Which of the following terms are applicable to troposcatter propagation?
A)
SIOs
B)
Fading
C)
Faradays rotation
D)
Atmospheric storms

Correct Answer :   Fading

Explanation : Tropospheric scatter propagation is subject to two types of fading called Rayleigh fading (due to multipath propagation) and fading due to variations in atmospheric conditions along the propagation path.

A + 1.9 lens has a focal length of 25 mm. The diameter of lens is about
A)
1.3 mm
B)
130 mm
C)
13 mm
D)
None of the above

Correct Answer :   13 mm

ECE MCQ's

Power Electronics
Digital Electronics
Analog Electronics
Microprocessors
Radio Receivers
Signals and Systems
Satellite Communication
Communication Systems
Microwave Communication
Automatic Control Systems
Materials and Components
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