Analog Electronics
A power transistor dissipates 5 W. If ambient temperature is 30° and case to air thermal resistance is 10° C/W, the case temperature is
Answer: A
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A half wave diode circuit using ideal diode has an input voltage 20 sin ωt volts. Then average and rms values of output voltage are
Answer: B
and VC = 0.5 x 20 = 10 V.
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An op-amp has zero gain for common mode inputs. Then CMRR =
Answer: B
Since common mode signal is reduced to zero, CMRR is infinite.
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An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with β = 0.1 is used, the lower cut off frequency will be
Answer: C
New lower cutoff frequency = 
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Maximum efficiency of class B power amplifier is 50%.
Answer: B
Maximum efficiency for class B-operation can be 78.5% .
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To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
Answer: A
Resistor reduces surge current.
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An exponential amplifier has diode in feedback path.
Answer: B
It has resistance in feedback path.
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For high frequencies a capacitor like
Answer: B
. If w is very high, XC, is nearly zero.
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Feedback factor may be less or more than 1.
Answer: B
Feedback factor is much less than 1.
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A transistor has two p-n junctions. The batteries should be connected such that
Answer: C
Emitter base junction is forward biased and base-collector junction is reverse biased.
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