Exam Questions Paper - ECE Questions and Answers

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The trigonometric Fourier series for the waveform f(t) shown below contain

only cosine terms and zero value for the dc component

only cosine terms and a positive value for the dc component

only cosine terms and a negative value for the dc component

only sine terms and a negative for the dc component

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For a class B amplifier using a supply of V_CC = 30 V and driving a load of 16 Ω the maximum efficiency will be __________ .

72.4%

78.54%

62.4%

68.54%

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If x[n] = cos then the sequence x[n] is

non-periodic

periodic

depends on n

none of these

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The point P in the following figure is stock at 1. The output f will be

ABC

AB C

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(11)₂ + (11)₃ = (11)_?

none

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For a given transfer function: Damping ratio is:

0.707

0.695

1.414

0.798

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Find the electric charge required on the earth and moon to balance their gravitational attraction if the charge on the earth is 10 times that on the moon.

1.73 TC

17.3 GC

17.3 TC

1.73 GC

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An audio signal of FM radio station is sampled at a rate of 15% above the Nyquist rate. Signal is sampled in 512 levels and bandwidth of the signal is 4 KHz. The minimum bandwidth required to transmit this signal will be

77 K bits/sec

92 K bits/sec

84.8 K bits/sec

82.8 K bits/sec

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A Hartley oscillator uses FET with g_m of 2 ms and r_d = 2 KΩ. The total coil inductance is 10 μH with turns ratio of input to output side of 1 : 10. It is tuned with a 50 pf capacitor. Find frequency of oscillations, amplifier gain margin in dB.

7.11 MHz, 13.97 dB

7.3 MHz, 14.1 dB

6.93 MHz, 12.9 dB

7.4 MHz, 13 dB