⚡Electrical Engineering MCQs
Electrical Engineering MCQs
499 MCQs261
In a transistor amplifier circuit VCE = VCB +________________?
AVBE
B2VBE
C5 VBE
DNone of the above
262
The stability factor of a collector feedback bias circuit is_______________ that of base resistor bias?
AThe same as
BMore than
CLess than
DNone of the above
263
If the temperature increases, the value of VCE_________________?
ARemains the same
BIs increased
CIs decreased
DNone of the above
264
The push-pull circuit must use ______________ operation?
AClass A
BClass C
CClass B
DClass AB
265
What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?
A2
B7
C3
DNone of the above
266
For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
A10 W
B4 W
C8 W
DNone of the above
267
The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
A10 W
B15 W
C5 W
D20 W
268
The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ?
A20 W
B40 W
C10 W
D80 W
269
Power amplifiers generally use transformer coupling because transformer permits______________?
ACooling of the circuit
BImpedance matching
CDistortionless output
DGood frequency response
270
The most important consideration in power amplifier is __________________?
ABiasing the circuit
BCollector efficiency
CTo keep the transformer cool
DNone of the above