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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 11
46.
The order of the differential equation
is
1
2
3
4
Answer: Option
Explanation:

The order of differential equation is two.

47.
A radio wave is incident on a layer of ionosphere at an angle of 30° with the vertical. If the critical frequency is, 1.2 MHz, the maximum usable frequency is
1.2 MHz
2.4 MHz
0.6 MHz
1.386 MHz
Answer: Option
Explanation:

fmuf = for sec i = 1.2 x 106 x sec (30°) = 1.386 MHz.

48.
The Thevenin resistance of the circuit is
3 K
Answer: Option
Explanation:

Diode is the non-linear element

Find RTH across diode short voltage supplies.

RAB= RTH = 3K + (2K || 1K)

.

49.
Fourier transform of signal obtained after taking difference between step function and its reverse version is given as __________ .
2jω
2/jω
4/jω
4jω
Answer: Option
Explanation:

u(t) - u(-t) = sgn (t)

50.
An air-filled rectangular waveguide has dimensions 8cm x 10cm . The group velocity is
1.8 x 108 m/s
2.6 x 108 m/s
3 x 108 m/s
0.3 x 108 m/s
Answer: Option
Explanation:

=2.6 x 108 m/s.

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