Electrical Engineering · Question Bank

Electronics

384 questions · page 17 of 20. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
#321
The gain of an amplifier is expressed in dB unit because
Ait is a simple unit
Bcalculations become easy
Chuman ear response is logarithmic
Dit is the most appropriate unit
#322
What is the typical value of the emitter bypass capacitor Ce in a multistage amplifier?
Aabout 0.1 μF
Babout 50 μF
Cabout 100 pF
Dabout 0.01 μF
#323
In a multistage amplifier, if the stages have R and C component only, _____ operation is apparent.
Aclass B
Bclass C
Cclass A
Dclass AB
#324
In practice, what is normally varied in order to change frequency of oscillations?
Acapacitance
Binductance
Cresistance
Dimpedance
#325
What is the main consideration in the output stage of an amplifier?
Apower output
Bvoltage gain
Cpower gain
Dcurrent gain
#326
Transformer coupling provides high gain because
Atransformer is very efficient
Btransformer matching can be achieved
Ctransformer steps up the voltage
Dtransformer steps up the current
#327
When negative voltage feedback is applied to an amplifier, its output impedance
Aremains unchanged
Bdecreases
Cincreases
Dbecomes zero
#328
An LC oscillator cannot be used to produce _____ frequencies.
Ahigh
Bvery high
Caudio
Dvery low
#329
A transistor converts
Adc power into ac power
Bac power into dc power
Chigh resistance into low resistance
Dlow resistance into high resistance
#330
Hartley oscillator is commonly used in which of the following?
Aradio receivers
BTV receivers
Cradio transmitters
DCATV
#331
An oscillator oscillates due to
Anegative feedback
Bpositive feedback
Cboth positive and negative feedback
Dneither positive and negative feedback
#332
Generally, tuned amplifiers are operated in
Aclass C
Bclass A
Cclass B
Dclass AB
#333
A tuned amplifier is used in what application?
Aradio frequency
Baudio frequency
Cintermediate frequency
Dlow frequency
#334
What is the ratio of output to input impedance of a CE amplifier?
Avery low
Bvery high
Cmoderate
Dapproximately 1
#335
For a constant output frequency, the simplest sinusoidal oscillator circuit due to construct is _____.
Athe crystal circuit
Bthe phase-shift circuit
Cthe Colpitts circuits
Dthe Hartley circuit
#336
Transformer coupling introduces what type of distortion?
Aamplitude
Bfrequency
Cphase
Dintermodulation
#337
A pulsating dc applied to power amplifiers causes
Aburning of transistor
Bhum in the circuit
Cexcessive forward voltage
Dexcessive reverse voltage
#338
What is the disadvantage of impedance matching?
Ait gives distorted output
Bit requires a transformer
Cit gives low power output
Dit is expensive
#339
In a phase-shift oscillator, _____ RC sections are generally used.
A3
B4
C2
D5
#340
In a phase shift oscillator, what are the frequency determining elements?
AL and C
BR, L and C
CR and C
DR and L

More Electrical Engineering topics