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 7 of 8
- A. GS/(G+S)
- B. G+S
- C. G-S
- D. None of the above
Explanation: The shunt S is connected in parallel with the galvanometer resistance G, so the equivalent resistance is the parallel combination…
Correct answer: GS/(G+S)- A. 1 kO/V
- B. 10 kO/V
- C. 5 kO/V
- D. Data insufficient
Explanation: Voltmeter sensitivity is the reciprocal of full-scale deflection current: 1/(100 microampere) = 10,000 ohms per volt, or 10 kΩ/V.
Correct answer: 10 kO/V- A. Carbon
- B. Sulphur
- C. Silicon
- D. Phosphorous
Explanation: The inside face of a CRT is coated with a phosphor material, which emits visible light when struck by the electron beam.
Correct answer: Phosphorous- A. More
- B. Less
- C. Same
- D. None of the above
Explanation: A VTVM uses vacuum-tube or electronic amplification at its input, giving it a very high input resistance and reducing circuit loading.
Correct answer: More125. If the full-scale deflection current of a multimeter is 50 µA, its sensitivity is ________________?
- A. 10 kO/V
- B. 100 kO/V
- C. 50 kO/V
- D. 20 kO/V
Explanation: Sensitivity in ohms per volt is 1 divided by the full-scale current: 1/(50 microampere) = 20,000 ohms per volt, or 20 kΩ/V.
Correct answer: 20 kO/V- A. Parallel
- B. Series
- C. Series or parallel
- D. None of the above
Explanation: A voltmeter is connected in parallel so it has the same potential difference as the component being tested.
Correct answer: Parallel- A. An ammeter
- B. A voltmeter
- C. A wattmeter
- D. None of the above
Explanation: A galvanometer in series with a high resistance allows only a small current proportional to the applied voltage, forming a voltmeter.
Correct answer: A voltmeter- A. Zero
- B. Very high
- C. Very low
- D. None of the above
Explanation: A voltmeter is connected in parallel, so its resistance must be very high to draw negligible current and avoid changing the circuit…
Correct answer: Very high- A. Infinite
- B. Very large
- C. Very low
- D. None of the above
Explanation: An ammeter is placed in series, so it must have very low resistance to cause only a negligible voltage drop.
Correct answer: Very low130. An ammeter is connected in __________ with the circuit element whose current we wish to measure?
- A. Series
- B. Parallel
- C. Series or parallel
- D. None of the above
Explanation: A series connection forces the same current through the ammeter and the circuit element under test.
Correct answer: Series- A. O
- B. Amperes
- C. kO/V
- D. none of the above
Explanation: Multimeter sensitivity is specified as resistance per volt, such as Ω/V or kΩ/V, and indicates the meter's loading effect on the circuit.
Correct answer: kO/V- A. 20 kO
- B. 50 kO
- C. 10 kO
- D. None of the above
Explanation: Internal resistance equals sensitivity multiplied by the full-scale voltage: 1000 Ω/V × 50 V = 50,000 Ω = 50 kΩ.
Correct answer: 50 kO- A. 1000 O
- B. 10 kO
- C. 20 kO
- D. 10 MO
Explanation: A VTVM uses a vacuum-tube or electronic amplifier input, giving it a very high input resistance, typically about 10 MΩ.
Correct answer: 10 MO- A. Thermometer method
- B. Resistance method
- C. Embedded temperature detector method
- D. Any of the above
Explanation: Temperature rise may be measured directly with a thermometer, inferred from resistance change, or detected by an embedded temperature…
Correct answer: Any of the above- A. temperature
- B. resistance
- C. eddy currents
- D. coupling co-efficient
Explanation: A thermocouple produces a voltage related to the temperature difference between its junctions, so it is primarily used for temperature…
Correct answer: temperature- A. Copper
- B. Nichrome
- C. Platinum
- D. Manganin
Explanation: Manganin has relatively high resistivity, a low temperature coefficient, and good long-term stability, making it suitable for standard…
Correct answer: Manganin- A. Copper-constantan
- B. Aluminium-tin
- C. Silver-German silver
- D. Iron-steel
Explanation: Copper-constantan, also called a type T thermocouple, is a commonly used thermocouple pair for moderate temperature measurement.
Correct answer: Copper-constantan- A. 55 Ω
- B. 5.5 Ω
- C. 50 Ω
- D. 9 Ω
Explanation: The shunt carries 9 mA while the meter movement carries 1 mA, so equal parallel voltages give Rsh = (1 mA × 50 Ω)/9 mA ≈ 5.5 Ω.
Correct answer: 5.5 Ω- A. Optical pyrometer
- B. Mercury thermometer
- C. Alcohol thermometer
- D. Any of the above
Explanation: An optical pyrometer measures furnace temperature from the thermal radiation emitted by the hot interior or charge, without needing…
Correct answer: Optical pyrometer- A. thermocouple
- B. pyrometer
- C. resistance thermometer
- D. thermometer
Explanation: A resistance thermometer, commonly an RTD, measures winding temperature through the change in resistance of its sensing element.
Correct answer: resistance thermometer