Electrical Eng. · Question Bank

Electronics

384 questions · page 15 of 20. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
#281
When amplifiers are cascaded
Athe gain of each amplifier is increased
Ba lower supply voltage is required
Cthe overall gain is increased
Deach amplifier has to work less
#282
In a common emitter amplifier, the capacitor from emitter to ground is called the
Acoupling capacitor
Bbypass capacitor
Cdecoupling capacitor
Dtuning capacitor
#283
A class A power amplifier uses _____ transistor/s.
A2
B1
C3
D4
#284
What is the maximum collector efficiency of a resistance loaded class A power amplifier?
A50%
B78.5%
C25%
D30%
#285
What is the maximum collector efficiency of a transformer coupled class A power amplifier?
A30%
B80%
C45%
D50%
#286
Class C amplifiers are used as
AAF amplifiers
Bsmall signal amplifiers
CRF amplifiers
DIF amplifiers
#287
If the capacitor from emitter to ground in a common emitter amplifier is removed, the voltage gain
Aincreases
Bdecreases
Cbecomes erratic
Dremains the same
#288
Comparatively, power amplifier has _____ ß.
Alarge
Bvery large
Csmall
Dvery small
#289
The driver stage usually employs _____ amplifier.
Aclass A power
Bclass C
Cpush-pull
Dclass AB
#290
The push-pull circuit must use _____ operation.
Aclass A
Bclass B
Cclass C
Dclass AB
#291
A complementary-symmetry amplifier has
A1 PNP and 1 NPN transistor
B2 PNP transistors
C2 NPN transistors
D2 PNP and 2 NPN transistors
#292
Power amplifiers generally use transformer coupling because coupling provides
Acooling of the circuit
Bdistortionless output
Cimpedance matching
Dgood frequency response
#293
The output transformer used in a power amplifier is a/an _____ transformer.
A1:1 ratio
Bstep-down
Cstep-up
Disolation
#294
Transformer coupling can be used in _____ amplifiers.
Aonly power
Bonly voltage
Ceither power or voltage
Dneither power nor voltage
#295
When negative current feedback is applied to an amplifier, its output impedance
Aincreases
Bremains unchanged
Cdecreases
Dbecomes zero
#296
The quiescent current of a FET amplifier is
AIds
Bid
CID
DId
#297
The total decibel voltage gain of two cascaded voltage amplifier where individual voltage gains are 10 and 100 is
A20
B60
C800
D1000
#298
The frequency response of the combined amplifier can be compared with
Aan OR gate
Ba negative feedback amplifier
Ca positive filter
Dan AND gate
#299
Minimum interference with frequency response can be given by
Adirect coupling
BRC coupling
Ctransformer coupling
Dinstrumentation and control
#300
The impedance of a load must match the impedance of the amplifier so that
Aminimum power is transferred to the load
Bthe efficiency can be maintained at a low level
Cthe signal-to-noise ratio is maximized
Dmaximum power is transferred to the load

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