Electrical Engineering · Question Bank

Electronics

391 of 433 questions match · page 15 of 20. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 391Problem solvingObjective 391
DifficultyAll 433Easy 391Medium 42Hard
✕ Clear filters
#281📘 reviewer_appEasy
An oscillator employs ______ feedback.
Apositive
Bnegative
Cboth positive and negative
Dneither positive nor negative
#282📘 reviewer_appEasy
The reason why RC coupling is not used to amplify extremely low frequencies.
Athere is considerable power loss
Belectrical size of coupling capacitor becomes very large
Cthere is hum in the output
Delectrical size of coupling capacitor becomes very small
#283📘 reviewer_appEasy
A pair of filter common on high fidelity system which separate audio frequency band signals into two separate groups, where one is fed to the tweeter and the other to the woofer is called
Aequalizer
Bsynthesizer
Ccross over network
Dhybrid
#284📘 reviewer_appEasy
The simplest variable-frequency sinusoidal oscillator is
Athe complicated Colpitts circuit
Bthe crystal circuit
Cthe Armstrong circuit
Dthe phase shift circuit
#285📘 reviewer_appEasy
In the initial stages of a multistage amplifier, _____ coupling is used.
Alink
BRC
Ctransformer
Dimpedance
#286📘 reviewer_appEasy
The gain of an amplifier with feedback is known as _____ gain.
Aclosed loop
Bresonant
Copen loop
Dunity
#287📘 reviewer_appEasy
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
#288📘 reviewer_appEasy
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
#289📘 reviewer_appEasy
In a multistage amplifier, if the stages have R and C component only, _____ operation is apparent.
Aclass B
Bclass C
Cclass A
Dclass AB
#290📘 reviewer_appEasy
In practice, what is normally varied in order to change frequency of oscillations?
Acapacitance
Binductance
Cresistance
Dimpedance
#291📘 reviewer_appEasy
What is the main consideration in the output stage of an amplifier?
Apower output
Bvoltage gain
Cpower gain
Dcurrent gain
#292📘 reviewer_appEasy
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
#293📘 reviewer_appEasy
When negative voltage feedback is applied to an amplifier, its output impedance
Aremains unchanged
Bdecreases
Cincreases
Dbecomes zero
#294📘 reviewer_appEasy
An LC oscillator cannot be used to produce _____ frequencies.
Ahigh
Bvery high
Caudio
Dvery low
#295📘 reviewer_appEasy
A transistor converts
Adc power into ac power
Bac power into dc power
Chigh resistance into low resistance
Dlow resistance into high resistance
#296📘 reviewer_appEasy
Hartley oscillator is commonly used in which of the following?
Aradio receivers
BTV receivers
Cradio transmitters
DCATV
#297📘 reviewer_appEasy
An oscillator oscillates due to
Anegative feedback
Bpositive feedback
Cboth positive and negative feedback
Dneither positive and negative feedback
#298📘 reviewer_appEasy
Generally, tuned amplifiers are operated in
Aclass C
Bclass A
Cclass B
Dclass AB
#299📘 reviewer_appEasy
A tuned amplifier is used in what application?
Aradio frequency
Baudio frequency
Cintermediate frequency
Dlow frequency
#300📘 reviewer_appEasy
What is the ratio of output to input impedance of a CE amplifier?
Avery low
Bvery high
Cmoderate
Dapproximately 1

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