Exercise: Analog Electronics

Questions for: Analog Electronics

In a transistor the minimum and maximum values of βdc are 100 and 121. The proper value of βdc to be used to locate Q point is
A:
100
B:
121
C:
110.5
D:
110
Answer: D

Lowest value of β should be used to locate Q point.

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Output of a phase splitter is
A:
a pair of sine waves of unequal amplitude
B:
a pair of sine waves of equal amplitudes
C:
a pair of sine waves of equal amplitudes and opposite phase
D:
a pair of sine waves of unequal amplitudes and opposite phase
Answer: C

A phase shifter gives two voltages which have equal magnitudes but are out of phase by 180°.

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A class C amplifier has input frequency of 200 kHz. If width of collector pulses is 0.1 μs, duty cycle is
A:
1%
B:
2%
C:
10%
D:
20%
Answer: B

.

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In the following figure C = 0.02 μF, and Vth is known to be of frequency ω = 107 rad/sec and rd = 2.5 Ω and ZTh = RTh = 10 Ω Then phase angle between id and Vd
A:
26.5°
B:
25°
C:
30°
D:
0°
Answer: A

Zd = (rd)11 (-jxd) 2 - JΩ

θ = tan-1 (-1/2) 26.56 .

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Assertion (A): In class C amplifier the efficiency is more than that for other classes of amplifiers

Reason (R): In class C amplifier we can get high efficiency over a wideband

A:
Both A and R are correct and R is correct explanation for A
B:
Both A and R are correct but R is not correct explanation for A
C:
A is correct R is wrong
D:
A is wrong R is correct
Answer: C

R is not correct because bandwidth of class C amplifier is narrow.

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