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Free download in PDF Electronics and Instrumentation General Knowledge Short Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
41
The outstanding characteristics of a D.C. amplifier is its
[A]
Ability to amplify Dc and low frequency signals
[B]
Temperature stability
[C]
Utmost economy
[D]
Avoidance of frequency sensitive components
Answer: Ability to amplify Dc and low frequency signals
42
The amplifier gain varies with frequency. This happens mainly due to
[A]
Miller effect
[B]
Presence of external and internal capacitance
[C]
Logarithmic increase in its output
[D]
Inter stage transformer
Answer: Presence of external and internal capacitance
43
The amplifier which has no drift is called as
[A]
Chopper amplifier
[B]
Single ended amplifier
[C]
Differential amplifier
[D]
DC amplifier
Answer: Chopper amplifier
44
In an amplifier, the coupling capacitors are employed for
[A]
Limiting the bandwidth
[B]
Matching the impedance
[C]
Preventing of Dc mixing with input or output
[D]
Controlling the output
Answer: Preventing of Dc mixing with input or output
45
An ideal amplifier has
[A]
Noise figure of 0 db
[B]
Noise figure of more than 0 db
[C]
Noise factor of unity
[D]
Noise figure of less than 1 db
Answer: Noise factor of unity
46
Power gain in decibels is equal to voltage gain in decibels only when
[A]
Input impedance is equal to output impedance
[B]
Output impedance is zero
[C]
Never
[D]
Input impedance is zero
Answer: Input impedance is equal to output impedance
47
The decibel is a measure of
[A]
Power level
[B]
Power
[C]
Current
[D]
Voltage
48
The resistance of LDR ________________ when exposed to radiant energy.
[A]
Remains unaltered
[B]
Increases
[C]
Reaches maximum
[D]
Decreases
49
Photo multiplier consists of
[A]
1 Photo emissive cathode & 2 dynodes
[B]
2 Photo emissive cathodes & 2 dynodes
[C]
2 Photo emissive cathodes & 1 dynode
[D]
1 Photo emissive cathode & 1 dynode
Answer: 1 Photo emissive cathode & 2 dynodes
50
Fiber optic sensor can be used to sense _________
[A]
Displacement
[B]
Power
[C]
Current
[D]
Resistance
51
____________ fiber is used in interferometric instruments.
[A]
Monomode
[B]
Multimode
[C]
Birefringent
[D]
Coated
52
In a graded index fiber, the total reflected light takes a ___________
[A]
Straight line path
[B]
Parabolic path
[C]
Elliptical path
[D]
Circular path
53
The capacitance microphone is used for the detection of
[A]
Heart rate
[B]
Blood flow
[C]
Heart sound
[D]
Foot pressure
54
Resistively generated inference arises through incorrect __________________
[A]
Grounding
[B]
Current density at the electrodes
[C]
Supply voltage
[D]
Input impedance
55
To reduce common mode interference during recording of bio signals one can use__________
[A]
Buffer amplifier
[B]
Differential amplifier
[C]
Single ended amplifier
[D]
Chopper amplifier
Answer: Differential amplifier
56
The improper response time of the amplifier in the biomedical recorders
[A]
Affects the gain of the amplifier
[B]
Delays the signals
[C]
Changes the shape of the waveform of the signal
[D]
Attenuates the signals
Answer: Changes the shape of the waveform of the signal
57
Isolation amplifiers are also called as
[A]
Iso-amps
[B]
Inverting amplifier
[C]
DC amplifier
[D]
Output amplifier
58
Isolation amplifier actually operates on the principle of
[A]
Filtering
[B]
Attenuation
[C]
Clipping
[D]
Amplification
59
CMRR is more in_______________
[A]
Single ended amplifier
[B]
Differential amplifier
[C]
Inverting operational amplifier
[D]
Chopper amplifier
Answer: Differential amplifier
60
For biomedical applications the mostly used amplifier is
[A]
Single ended amplifier
[B]
Differential amplifier
[C]
Inverting operational amplifier
[D]
Chopper amplifier
Answer: Differential amplifier
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