Exercise: Analog Electronics

Questions for: Analog Electronics

A 120 V, 30 Hz source feeds a half wave rectifier circuit through a 4 : 1 step down transformer, the average output voltage is
A:
30 V
B:
13.5 V
C:
10 V
D:
7.07 V
Answer: B

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In a CE amplifier circuit the ac voltage between emitter and ground
A:
is very high
B:
may be high or low
C:
is zero
D:
depends on circuit configuration
Answer: C

Common emitter means emitter at ground potential.

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The turn ratio of a transformer is 20:1, if a load of 10Ω is connected across the secondary, what will be the effective resistance seen looking into the Primary?
A:
2 kΩ
B:
4 kΩ
C:
8 kΩ
D:
32 kΩ
Answer: B

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The circuit in the given figure is
A:
low pass filter
B:
high pass filter
C:
band Pass filter
D:
band reject filter
Answer: A

It is a L.P.F. of second order.

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In full wave rectification, if the input frequency is 50 Hz, then frequency at the output of filter is
A:
50 Hz
B:
0 Hz
C:
100 Hz
D:
75 Hz
Answer: B

Filter output will give d.c. signal and d.c. signal Passed zero frequency.

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