Electrical Engineering · Question Bank

Electronics

391 of 433 questions match · page 16 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
#301📘 reviewer_appEasy
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
#302📘 reviewer_appEasy
Transformer coupling introduces what type of distortion?
Aamplitude
Bfrequency
Cphase
Dintermodulation
#303📘 reviewer_appEasy
A pulsating dc applied to power amplifiers causes
Aburning of transistor
Bhum in the circuit
Cexcessive forward voltage
Dexcessive reverse voltage
#304📘 reviewer_appEasy
What is the disadvantage of impedance matching?
Ait gives distorted output
Bit requires a transformer
Cit gives low power output
Dit is expensive
#305📘 reviewer_appEasy
In a phase-shift oscillator, _____ RC sections are generally used.
A3
B4
C2
D5
#306📘 reviewer_appEasy
In a phase shift oscillator, what are the frequency determining elements?
AL and C
BR, L and C
CR and C
DR and L
#307📘 reviewer_appEasy
The input impedance of which amplifier depends strongly on load resistance?
ACE
BCC
CCB
DCD
#308📘 reviewer_appEasy
What capacitors are used in transistor amplifiers?
Apaper
Belectrolytic
Cmica
Dmylar
#309📘 reviewer_appEasy
An important limitation of crystal oscillator is
Aits low output
Bits high Q
Cless availability of quartz crystal
Dits high output
#310📘 reviewer_appEasy
What type of feedback is used in Wien bridge oscillator?
A+
B-
Cboth + and -
Deither + or -
#311📘 reviewer_appEasy
Which of the following below is not a description of the two-stage amplifiers
Athe input resistance is equal to the input resistance of the first stage unless feedback is applied
Bits output resistance is equal to the output resistance of the final stage unless feedback is applied
Cits noise level is equal to the accumulated noise of the two stages, either by multiplying the noise voltage amplitudes together or by adding the noise decibel levels together
Dthe output resistance is equal to the output resistance of the first stage unless feedback is applied
#312📘 reviewer_appEasy
What is the most costly coupling?
ARC coupling
Bdirect
Ctransformer
Dinductive
#313📘 reviewer_appEasy
When the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, feedback factor is
A10
B0.1
C0.01
D0.15
#314📘 reviewer_appEasy
What is the piezoelectric effect in a crystal?
Avoltage is developed because of mechanical stress
Bchange in resistance because of temperature
Cchange of frequency because of temperature
Dcurrent is developed due to force applied
#315📘 reviewer_appEasy
What is the typical Q of a crystal?
A100
B50
C1000
Dmore than 10,000
#316📘 reviewer_appEasy
What is the axis that connects the corners of a crystal?
AX
Bmechanical
CY
DZ
#317📘 reviewer_appEasy
_____ is usually employed at the output stage of an amplifier.
Aclass A power amplifier
Bpush-pull amplifier
Cpre-amplifier
Ddifferential amplifier
#318📘 reviewer_appEasy
Why is it that the size of a power transistor is made considerably large?
Ato provide easy handling
Bto dissipate more heat
Cto simplify construction
Dto facilitate connections
#319📘 reviewer_appEasy
When crystal frequency increases with temperature, it has _____ temperature co-efficient.
A+
B-
C0
Dinfinite
#320📘 reviewer_appEasy
An emitter follower is equivalent to
Acommon emitter amplifier
Bcommon collector amplifier
Ccommon base amplifier
Dhybrid connection

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