Electronics and Instrumentation General Knowledge Quiz | Electronics and Instrumentation General Knowledge Short Questions & Answers

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Questions
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
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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

Answer: Power level
48 The resistance of LDR ________________ when exposed to radiant energy.
A Remains unaltered
B Increases
C Reaches maximum
D Decreases

Answer: 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

Answer: Displacement
51 ____________ fiber is used in interferometric instruments.
A Monomode
B Multimode
C Birefringent
D Coated

Answer: Monomode
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

Answer: Parabolic path
53 The capacitance microphone is used for the detection of
A Heart rate
B Blood flow
C Heart sound
D Foot pressure

Answer: Heart sound
54 Resistively generated inference arises through incorrect __________________
A Grounding
B Current density at the electrodes
C Supply voltage
D Input impedance

Answer: Grounding
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

Answer: Iso-amps
58 Isolation amplifier actually operates on the principle of
A Filtering
B Attenuation
C Clipping
D Amplification

Answer: Attenuation
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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