⚡Electrical Engineering MCQs
Electrical Engineering MCQs
499 MCQs341
In practice, voltage gain is expressed______________?
AIn db
BIn volts
CAs a number
DNone of the above
342
The final stage of a multistage amplifier uses______________?
ARC coupling
BTransformer coupling
CDirect coupling
DImpedance coupling
343
RC coupling is not used to amplify extremely low frequencies because____________?
AThere is considerable power loss
BThere is hum in the output
CElectrical size of coupling capacitor becomes very large
DNone of the above
344
1 db corresponds to_____________change in voltage or current level?
A40%
B80%
C20%
D25%
345
The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?
APower loss in the coupling device
BLoading effect of the next stage
CThe use of many transistors The use of many capacitors
346
A current amplification of 2000 is a gain of_________________?
A3 db
B66 db
C20 db
D200 db
347
The number of stages that can be directly coupled is limited because___________?
AChanges in temperature cause thermal instability
BCircuit becomes heavy and costly
CIt becomes difficult to bias the circuit
DNone of the above
348
The bandwidth of a single stage amplifier is_____________that of a multistage amplifier?
AMore than
BThe same as
CLess than
DData insufficient
349
The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?
A5 mV
B2 mV
C8 mV
D5 mV
350
If the power level of an amplifier reduces to half, the db gain will fall by___________?
A5 db
B2 db
C10 db
D3 db