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Free download in PDF Electronics and Instrumentation General Knowledge Multiple Choice Questions(MCQs) with 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.
61
___________ amplifier is used to drive the recorder.
[A]
Power amplifier
[B]
Pre amplifier
[C]
Operational amplifier
[D]
Differential amplifier
62
When a number of components are fabricated on same IC chip it is necessary to provide isolation between two different components for input interconnection is called __________
[A]
Input amplification
[B]
Input differentiation
[C]
Common mode rejection
[D]
Input isolation
63
A chopper amplifier
[A]
Converts AC signal from low frequency to high frequency
[B]
Converts DC signal from low frequency to high frequency
[C]
Converts AC signal from low frequency to DC high frequency
[D]
Converts DC signal from low frequency to high frequency
Answer: Converts DC signal from low frequency to high frequency
64
Pre amplifier isolation in ECG circuit is to
[A]
Increase input impedance
[B]
Decrease input impedance
[C]
Increase output impedance
[D]
Decrease output impedance
Answer: Increase input impedance
65
Raising input impedance of pre amplifier reduces
[A]
Input current
[B]
Output current
[C]
Stray current
[D]
Grid current
66
Common mode rejection ratio is defined as ratio of
[A]
Common mode gain to differential mode gain
[B]
Differential mode gain to common mode gain
[C]
Common mode gain at input to differential mode gain at input
[D]
Common mode gain at output to differential mode gain at output
Answer: Differential mode gain to common mode gain
67
An electrometer amplifier has high input impedance of
[A]
1015?
[B]
1020?
[C]
105?
[D]
1010?
68
When the input of differential amplifier V1 = 0, then the differential amplifier is said to be operated in
[A]
Common mode
[B]
Differential mode
[C]
Non inverting mode
[D]
Inverting mode
Answer: Non inverting mode
69
When either one of the inputs to the differential amplifier is equal to zero then it is said to be operated in
[A]
Inverting mode
[B]
Single ended mode
[C]
Differential mode
[D]
Non inverting mode
Answer: Single ended mode
70
The negative feed back in an amplifier
[A]
Reduces voltage gain
[B]
Increases the voltage gain
[C]
Increases the gain band width product
[D]
Reduces the input impedances
Answer: Reduces voltage gain
71
Feedback in an amplifier always helps in
[A]
Controlling its output
[B]
Stabilizes its gain
[C]
Increasing its input impedance
[D]
Increasing its gain
Answer: Controlling its output
72
Using mechanical chopper we cannot achieve high chopping rates due to their
[A]
Inertia
[B]
Response time
[C]
Input impedance
[D]
Output impedance
73
The CMRR of a typical IC OPAMP is
[A]
80 dB
[B]
75 dB
[C]
70 dB
[D]
85 dB
74
A ————– is usually a display device used to produce a paper record of analog wave form.
[A]
Graphic pen recorder
[B]
Electron microscope
[C]
X-Y recorder
[D]
Oscilloscope
Answer: Graphic pen recorder
75
The _________ of a recording system is the magnitude of input voltage required to produce a standard deflection in a recorded trace.
[A]
Accuracy
[B]
Linearity
[C]
Sensitivity
[D]
Resolution
76
A recorder is said to have good frequency response when the sensitivity of the system is _________ for all frequencies present in the signal.
[A]
Constant
[B]
Infinity
[C]
Unity
[D]
Zero
77
In phase response of a recorder noise level ___________ with the band width of a system
[A]
Increases
[B]
Reaches infinity
[C]
Decreases
[D]
Reaches unity
78
Stress and strain curves are plotted using
[A]
Magnetic tape recording
[B]
X-Y recording
[C]
Galvanometric
[D]
PMMC writing systems
79
The writing speed of fast storage oscilloscope is
[A]
2000 cm/?s
[B]
1000 cm/?s
[C]
1500 cm/?s
[D]
2500 cm/?s
80
Storage oscilloscope operates on the principle of
[A]
Primary emission
[B]
Deflection
[C]
Secondary emission
[D]
Diffusion
Answer: Secondary emission
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