Free Measurement and Instrumentation MCQs with Answers
156 Measurement and Instrumentation MCQs from Electrical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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156 questions · page 6 of 8
- A. Shunts
- B. Multipliers
- C. Current transformers
- D. Potential transformers
- E. All of the above
Explanation: Shunts extend ammeter range, while multipliers extend voltmeter range; current and potential transformers extend ranges for AC…
Correct answer: All of the above- A. deflecting
- B. controlling
- C. damping
- D. any of the above
Explanation: The damping device absorbs the energy of the moving system and prevents pointer oscillations, allowing it to settle rapidly at the final…
Correct answer: damping- A. Absolute instruments
- B. Indicating instruments
- C. Recording instruments
- D. Integrating instruments
Explanation: An indicating instrument gives the instantaneous value through a pointer or display at the moment of measurement.
Correct answer: Indicating instruments- A. switch board
- B. portable
- C. both A. and B.
- D. moving coil
- E. moving iron
- F. both D. and E.
Explanation: Classification according to application includes switchboard and portable instruments.
Correct answer: both A. and B.- A. Must be a good insulator
- B. Should be non-evaporating
- C. Should not have corrosive action upon the metal of the vane
- D. The viscosity of the oil should not change with the temperature
- E. All of the above
Explanation: Good damping oil should insulate electrically, resist evaporation and corrosion, and retain nearly constant viscosity over temperature…
Correct answer: All of the above- A. nG
- B. (n-1)G
- C. G/(n-1)
- D. G/n
Explanation: The meter carries its original full-scale current I, while the parallel shunt carries (n − 1)I.
Correct answer: G/(n-1)- A. Voltage
- B. Frequency
- C. Phase
- D. All of above
Explanation: A CRO displays voltage versus time, allowing voltage amplitude and frequency to be measured; phase difference can also be found using…
Correct answer: All of above- A. nG
- B. G/n
- C. G/(n-1)
- D. (n-1)G
Explanation: The original voltmeter has total resistance G for full-scale voltage V.
Correct answer: (n-1)G- A. Voltmeter of range 10 V
- B. Moving coil galvanometer
- C. Ammeter of range 1 A
- D. A copper wire of length 1 m and diameter 3 mm
Explanation: A 10 V voltmeter is designed with a large series resistance to draw very little current.
Correct answer: Voltmeter of range 10 V- A. Low
- B. Infinite
- C. Zero
- D. High
Explanation: An ideal voltmeter must draw no current from the circuit, so its resistance is infinite.
Correct answer: Infinite- A. G/50
- B. G/49
- C. 49 G
- D. 50 G
Explanation: If 2% flows through the galvanometer, 98% flows through the shunt, so the shunt current is 49 times the galvanometer current.
Correct answer: G/49112. The horizontal plates of a CRO are supplied with _____________ to observe the waveform of signal?
- A. Sinusoidal wave
- B. Cosine wave
- C. Sawtooth wave
- D. None of the above
Explanation: The CRO horizontal plates receive a sawtooth time-base voltage, which moves the spot uniformly across the screen and then rapidly returns…
Correct answer: Sawtooth wave- A. Low
- B. Infinite
- C. Zero
- D. High
Explanation: An ideal ammeter should cause no voltage drop or disturbance in the measured circuit, so its resistance is zero.
Correct answer: Zero- A. 11 O
- B. 9 O
- C. 100 O
- D. 9 O
Explanation: The galvanometer carries 10% of the total current, while the shunt carries 90%, or nine times the galvanometer current.
Correct answer: 11 O115. Two multimeters A and B have sensitivities of 10 kO/V and 30 kO/V respectively. Then ______________?
- A. Multimeter A is more sensitive
- B. Multimeter B is more sensitive
- C. Both are equally sensitive
- D. None of the above
Explanation: Sensitivity in kΩ/V indicates the resistance presented per volt of range, and a larger value means less loading and greater sensitivity.
Correct answer: Multimeter B is more sensitive- A. 10 kO
- B. 20 kO
- C. 200 kO
- D. None of the above
Explanation: The total voltmeter resistance is R = V/I = 10/(50 × 10^-6) = 200,000 ohms, or 200 kΩ. Hence option c is correct.
Correct answer: 200 kO- A. 3 kO
- B. kO
- C. kO
- D. 6 kO
Explanation: At half-scale in a series ohmmeter, the external resistance equals the meter's internal series resistance.
Correct answer: 3 kO- A. Increase
- B. Decrease
- C. Remain the same
- D. None of the above
Explanation: A practical ammeter adds a small series resistance to the circuit, so the total resistance increases and the current decreases slightly.
Correct answer: Decrease- A. Voltage
- B. Current
- C. Resistance
- D. None of the above
Explanation: A VTVM measures voltage and resistance by using an electronic amplifier and rectifier or ohmmeter circuits, but it does not directly…
Correct answer: Current120. For display of signal pattern _____________voltage is applied to the horizontal plates of a CRO?
- A. Sinusoidal
- B. Rectangular
- C. Sawtooth
- D. None of the above
Explanation: A sawtooth voltage produces a uniform horizontal sweep of the CRO beam from left to right, followed by rapid flyback.
Correct answer: Sawtooth