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384 questions · page 18 of 20. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
#341
When the gain is 20 without feedback and 12 with negative feedback, feedback factor is
A0.033
B3/5
C5/3
D1/5
#342
The input impedance of which amplifier depends strongly on load resistance?
ACE
BCC
CCB
DCD
#343
What capacitors are used in transistor amplifiers?
Apaper
Belectrolytic
Cmica
Dmylar
#344
An important limitation of crystal oscillator is
Aits low output
Bits high Q
Cless availability of quartz crystal
Dits high output
#345
What type of feedback is used in Wien bridge oscillator?
A+
B-
Cboth + and -
Deither + or -
#346
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
#347
What is the most costly coupling?
ARC coupling
Bdirect
Ctransformer
Dinductive
#348
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
#349
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
#350
The input resistance of a common emitter amplifier is affected by
ARe, re, and ß
BRc and re
Cß and re
Da and re
#351
What is the typical Q of a crystal?
A100
B50
C1000
Dmore than 10,000
#352
What is the axis that connects the corners of a crystal?
AX
Bmechanical
CY
DZ
#353
_____ is usually employed at the output stage of an amplifier.
Aclass A power amplifier
Bpush-pull amplifier
Cpre-amplifier
Ddifferential amplifier
#354
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
#355
When crystal frequency increases with temperature, it has _____ temperature co-efficient.
A+
B-
C0
Dinfinite
#356
What is the purpose of the bypass capacitor in a common-emitter amplifier?
Ait increases voltage gain
Bit decreases voltage gain
Cit provides ac grounding
Dno effect in the circuit
#357
An emitter follower is equivalent to
Acommon emitter amplifier
Bcommon collector amplifier
Ccommon base amplifier
Dhybrid connection
#358
The crystal oscillator frequency is very stable due to _____ of the crystal.
Arigidity
Bductility
Chigh Q
Dlow Q
#359
The bandwidth of an amplifier ______ when negative feedback is applied.
Adecreases
Bremains unchanged
Cbecomes infinite
Dincreases
#360
The term 1 + Aß in the expression for gain with negative feedback is known as
Again factor
Bsacrifice factor
Cfeedback factor
Dquality factor

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