Exercise: Exam Question Papers

Questions for: Exam Question Papers

For a class B amplifier using a supply of VCC = 30 V and driving a load of 16 ÎĐ the maximum efficiency will be __________ .
A:
72.4%
B:
78.54%
C:
62.4%
D:
68.54%
Answer: B

The maximum output power is

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The trigonometric Fourier series for the waveform f(t) shown below contain
A:
only cosine terms and zero value for the dc component
B:
only cosine terms and a positive value for the dc component
C:
only cosine terms and a negative value for the dc component
D:
only sine terms and a negative for the dc component
Answer: C

Since given waveform is even, thus it will have only cosine terms. Function f(t) has more negative value then positive, so it will have negative DC Component.

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With respect to the Miller integrator sweep shown below, the sweep rate will be
A:
2
B:
4
C:
1.5
D:
2.5
Answer: A

Sweep rate = .

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In the following transistor circuit VBE = 0. 7 V, rc = 25mV/IE, and Îē and the capacitance are very large

The mid-band voltage gain of the amplifier is approximately
A:
- 180
B:
- 120
C:
- 90
D:
- 60
Answer: D

Midband voltage gain =

R'L = 3k || 3k = RC || RL = 1.5k

Thus .

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For a bipolar transistor, avalanche multiplication factor depends on __________ .
A:
VCE
B:
VCB
C:
VBE
D:
none of these
Answer: B

Avalanche multiplication factor

where, ÎēVCBO = collector - emitter breakdown voltage with open circuited base.

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