⚡Electrical Engineering MCQs
Electrical Engineering MCQs
499 MCQs281
If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ____________?
A20 kΩ
B2 kΩ
C10 kΩ
D5 kΩ
282
The output transformer used in a power amplifier is a _____________ transformer?
A1:1 ratio
BStep-up
CStep-down
DNone of the above
283
The pulsating d.c. applied to power amplifier causes________________?
ABurning of transistor
BHum in the circuit
CExcessive forward voltage
DNone of the above
284
If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?
AAmplitude
BIntermodulation
CFrequency
DNone of the above
285
If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?
A1V
B100V
C20V
D10V
286
What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?
A20%
B80%
C40%
D50%
287
The driver stage usually employs_________________?
AClass A power amplifier
BPush-pull amplifier
CClass C amplifier
DNone of the above
288
The output signal voltage and current of a power amplifier are 5V and 200 mA; the values being r.m.s. What is the power output ?
A1 W
B2 W
C4 W
DNone of the above
289
In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________________?
AShort
BOpen
CPartially open
DNone of the above
290
If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________?
ARL + RC
BRC || RL
CRL – RC
DRC