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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 6
41.
In a self bias circuit for CE amplifier, an increase in emitter resistance RE results in
increase in emitter voltage
decrease in emitter voltage
increase in emitter current
decrease in emitter current
Answer: Option
Explanation:

Emitter voltage is the same. Increase of emitter resistance decreases with emitter current.

42.
For a BJT if β = 50, ICEO = 3 μA and IC = 1.2 mA then IE
1 mA
1.2 mA
1.3 mA
1.4 mA
Answer: Option
Explanation:

IE = IC + IB .

43.
In the CE circuit shown in figure the slope of ac load line will be
Answer: Option
Explanation:

.

44.
When the circuit is switched on, the loop gain of a Wien bridge oscillator is
1
more than 1
less than 1
about 0.5
Answer: Option
Explanation:

The initial loop gain must be more than 1.

45.
The op-amp circuit shown in the figure is a filter. The type of filter and its cut off type of filter and its cut off frequency are respectively.
high Pass, 1000 rad/sec
low Pass, 100 rad/sec
high Pass, 10000 rad/sec
low pass, 10000 rad/sec
Answer: Option
Explanation:

At 1000 Hz frequency,

Hence, high pass filter, .

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