Basic Instrumentation Engineering MCQ
1. The inverse Discrete Fourier Transformation of x(n), an N-periodic signal can be expressed as ________.
Correct Answer:
3
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2. A closed loop of voltages is given in the above figure. According to the Kirchhoff's second law, V1+V2+V3+V4= _____.
Correct Answer:
0
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3. What would be the peak output voltage of a positive clamp, if an input signal of peak value 7V is applied with a bias of 4V?
Correct Answer:
18 V
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4. If the H+ concentration is 3.0*10-3 M, then the pH value of a solution will be ____.
Correct Answer:
2.52
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5.
State True/False:
When the Wheatstone bridge is balanced, the current through galvanometer is zero.
Correct Answer:
True
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6. Which of the following Boolean algebra expressions is incorrect?
Correct Answer:
A.1 = 1
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7.
This question is based upon the figure shown below
State True/False:
The Signal shown in the above image is periodic.
Correct Answer:
True
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8. Which of the following statements is false?
Correct Answer:
A piezoelectric transducer has very low DC output impedance.
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9. If 400 fringes cross the centre of the field of view by moving one mirror through a distance of 0.1347mm in a Michelson Interferometer, then what would be the wavelength of the light?
Correct Answer:
6735 Å (Angstrom)
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10. What would be the cut-off frequency, if a low-pass filter is built with a 20 nF capacitor and a 10 KΩ resistor?
Correct Answer:
796.2 Hz
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11. Which of the following statements is false about Voltmeter?
Correct Answer:
Its resistance is very less.
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12.
This question is based upon the figure shown below
From the above circuit diagram, what would be the approximate value of unknown voltage V1?
Correct Answer:
4V
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13.
This question is based upon the figure shown below
What would be the value of current through resistance R1 in the above circuit?
Correct Answer:
42.3 mA
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14.
This question is based upon the figure shown below
To measure the capacitive impedance at a frequency of 3 kHz, a capacitance comparison bridge is used. Choose the correct equivalent series circuit of the unknown impedance if the bridge constants at bridge balance are given as:
C3 = 11 µF, R1 = 1.3 kΩ, R2 = 110 kΩ, R3 = 130 kΩ
Correct Answer:
2
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15.
State True/False:
An operational amplifier produces an output voltage that is typically hundreds of thousands of times larger than the voltage difference between its input terminals.
Correct Answer:
True
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16. To convert a JK flip-flop into a T flip-flop, what would be the input values of J and K?
Correct Answer:
J=K=1
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17.
This question is based upon the figure shown below
An array from the polynomial s4 + 2s3 + 6s2 + 2s + 20 is given above to apply Routh criterion. What would be the value of the term indicated as "??" in the given array?
Correct Answer:
-6
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18. Which of the following statements is false about Linear Convolution?
Correct Answer:
The length of the output sequence will not be greater than the length of input sequences.
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19. If a clamper has a capacitor of capacitance, C = 0.02µF and resistance, R=400 KΩ, then what would be the total discharge time for the capacitor?
Correct Answer:
40 ms
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20.
This question is based upon the figure shown below
What would be the value of IC from the above circuit?
Correct Answer:
19.9 mA
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21.
This question is based upon the figure shown below
Which of the following is the simplified form of the Boolean expression as given in the above figure?
Correct Answer:
BC
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22.
This question is based upon the figure shown below
What would be the period (T) of the periodic signal as shown in the above image?
Correct Answer:
π/4
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23. Which of the following statements is false?
Correct Answer:
Hydraulic system is operated with compressed air while Pneumatic system is operated by pressurised oil.
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24. A 3mA meter having internal resistance of 100 ohm is to be converted to 0-160mA ammeter. What would be the value of the shunt resistance required?
Correct Answer:
1.911 ohm
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25.
Which of the following are the main modules of a mass spectrometer instrument?
I) Mass analyzer
II) Extraction system
III) Detector
IV) Ionizer
Correct Answer:
I, II, III, and IV
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26.
This question is based upon the figure shown below
A potential divider circuit is given in the above figure. What would be its output voltage (Vout), if the supplied voltage (VS) is 8V?
Correct Answer:
2.29 V
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27. Which of the following gates is a universal gate?
Correct Answer:
NAND gate
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28. An 8-bit digital to analog converter uses BCD input and produces a full-scale output of 9.90 Volt. What would be the analog output for the BCD input 1001 0101?
Correct Answer:
9.5V
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29.
This question is based upon the figure shown below
A 4-bit serial-in parallel-out shift register is given in the above figure. Its initial contents are given as 0101. If three clock pulses (CLK) are applied then what would the final contents of the shift register be?
Correct Answer:
1010
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30.
This question is based upon the figure shown below
A four-arm a.c. bridge network is shown in the figure above whose arms PQ has a non-reactive resistor of 1400Ω in parallel with a condenser having capacitance of 0.5µF, QR has a non-reactive resistor of 700Ω, RS has an unknown inductive resistor and SP has a non-reactive resistor of 400Ω. If it is given that the network is balanced, what would be the values of the unknown resistance and inductance across RS?
Correct Answer:
Rx = 200Ω, Lx = 140 mH
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31. The meter constant of 6A, 220V dc watt-hour meter is 3365 revolutions per kWh. What would be the number of revolutions in one minute?
Correct Answer:
74.03 r.p.m
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32. If a sinusoidal wave of angular frequency 1400 rad/s applied to the Y-Y plates of a Cathode Ray Oscilloscope produces six horizontal tangent points and five vertical tangent points, then what would be the frequency of the sinusoidal waveform applied to the X-X plates?
Correct Answer:
1680 rad/s
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33.
State True/ False:
The system y(t) = 4x2(t) is time invariant.
Correct Answer:
True
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34. If the refractive indices for the core and cladding of an optical fibre are 1.7 and 1.5 respectively. What would be the acceptance angle of the optical fibre?
Correct Answer:
53.1 degree
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35.
Which of the following statements is/are false?
(1) Fuzzy logic follows the principle of Aristotle and Buddha.
(2) The AND, OR, and NOT logical operators of Boolean logic are called Zadeh operators in Fuzzy logic.
Correct Answer:
(1) only
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36.
A light dependent resistor has a resistance of 200 ohms at a certain light level. It can only handle a current of 20 milliamps before it risks heating up.
If the LDR (Light Dependent Resister) is connected to a 40V supply, what would be the value of resistor we place in series?
Correct Answer:
1800 ohms
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37.
This question is based upon the figure shown below
In the above figure, initial value of the base current is 30 µA and the beta rating of the component is 300. If the base current (IB) increases from 30 µA to 60 µA, then what would be the change in the value of the collector current(Ic)?
Correct Answer:
9 mA
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38.
What would be the decimal number of the following excess-3 code?
Excess-3 code = 1010 0101
Correct Answer:
72
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39.
What would be the simplified form of the function given below using the Karnaugh map?
f=∑(0,3,7,11,14) + d∑(5,12,15)
(Where
Correct Answer:
C.D
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Instrumentation Engineering MCQs | Topic-wise
