MCQ on Electronic Measurement and Instrumentation

1) The purpose of the instruments is to:

1. Allow measurements to be made
2. Transmit the information
3. Change the signals
4. Any of the above

Correct Option: 1

2) The measurement refers to which of the following:

1. Primary signal
2. Measured variable
3. Output
4. All of the above

Correct Option: 3

3) The measurement of a quantity

1. Is an act of comparison of an unknown quantity with another quantity.
2. Is an act of comparison of an unknown quantity with a known quantity whose accuracy may be known or may not be known.
3. Is an act of comparison of an unknown quantity with a predefined acceptable standard which is accurately known.
4. None of the above.

Correct Option: 3

4) In present day measurements systems

1. Direct methods are commonly used.
2. One of the direct methods are limited but indirect methods are commonly used.
3. Both indirect and direct methods are commonly used.
4. All of the above.

Correct Option: 2

5) A null type of instrument as compared to a deflection type instrument has

1. A higher accuracy
2. A lower sensitivity
3. A faster response
4. All of the above.

Correct Option: 1

6) The usage of electronic instruments is becoming more extensive because they have

1. A high sensitivity and reliability.
2. A fast response and compatibility with digital computers.
3. The capability to respond to signals from remote places.
4. All the above

Correct Option: 4

7) Which of the following errors can arise, as a result of mistakes in reading, parallax, improper instrument location and inadequate lighting?

1. Construction error
2. Transmission error
3. Observation error
4. Translation error

Correct Option: 3

8) Errors which may be variable both in magnitude and nature (positive or negative) are classified as

1. Hysteresis errors
2. Random errors
3. Systematic errors
4. Interaction errors

Correct Option: 2

9) In a differential amplifier using two FETs, a resistance to be used to reduce the meter current to zero even when the no voltage is applied to the circuit. This is necessitated in account of

1. Mismatch between characteristics of two FETs.
2. Difference between tolerance values of resistors used in the circuit even though they are marked nominally equal.
3. Variations in the operating voltage of the circuit.
4. Both 1 and 2.

Correct Option: 4

10) A PMMC meter has an internal resistance of 500 Ω and the current required for its full scale deflection is 100 µA. the power consumed by the meter is

1. 5 µW
2. 5 mW
3. 5 W
4. 0.5 µW

Correct Option: 1

11) The advantage of Hay’s bridge over Maxwell’s inductance-capacitance bridge is because

1. Its equation for balance do not contain any frequency term.
2. It can be used for measurement of inductance of high Q coils.
3. It can be used for measurement of inductance of low Q coils.
4. None of the above.

Correct Option: 2

12) In a linear meter, half-scale deflection occurs when there is ………… per cent of the rated current through its coil

1. 100
2. 25
3. 50
4. 75

Correct Option: 3

13) It is desired to convert a 0-1000 µA meter movement, with an internal resistance of 100 Ω into 0-100 mA meter. The required value of shunt resistance is about

1. 1 Ω
2. 10 Ω
3. 99 Ω
4. 100 Ω

Correct Option: 1

14) Loading effect is principally caused by ……….. Instruments.

1. High resistance
2. Low sensitivity
3. High sensitivity
4. High range

Correct Option: 2

15) A multi-meter is used to measure

1. Resistance
2. Current
3. Voltage
4. All of the above

Correct Option: 4

16) Digital instruments are those which

1. Have numerical readout
2. Use LED or LCD displays
3. Have a circuitry of digital design
4. Use deflection type meter movement

Correct Option: 3

17) The main difference between electronic and electrical instruments is that an electronic instrument contains:

1. An electronic device
2. A transducer
3. A digital readout
4. Electrons

Correct Option: 1

18) A VTVM produces negligible loading effect on a circuit under test primarily because

1. It virtually draws no current from the circuit.
2. Of its very high internal resistance.
3. It uses high vacuum tubes.
4. It is a null deflection instrument

Correct Option: 2

19) The essential  elements of electronic instruments are:

1. Transducer.
2. Signal conditioner.
3. Indicating devices.
4. All of the above.

Correct Option: 4

20) The current sensitivity of meter is expressed in:

1. Ampere.
2. Ohm/ampere.
3. Ohm/volt.
4. Ampere/division

Correct Option: 3

21) The basic movement can be converted into an ohmmeter by connecting a ……………. With it.

1. High resistance in series
2. Low resistance in parallel
3. Battery in series
4. Battery and a variable resistance in series

Correct Option: 4

22) A 0-1 mA meter has a sensitivity of:

1. 1 kΩ/V
2. 1 mA
3. 1 k Ω
4. 1000 A

Correct Option: 1

23) A moving coil instrument has a resistance of 10 Ω and takes 40 mA to produce full-scale deflection. The shunt resistance required to convert this instrument for use as an ammeter of range of 0 to 2A is:

1. 0.1021 Ω
2. 0.2041 Ω
3. 0.2561 Ω
4. 0.4210 Ω

Correct Option: 2

24) To avoid errors in any experimental work, ……………… is necessary.

1. Planning
2. Execution
3. Evaluation
4. All of the above

Correct Option: 4

25) A device or mechanism used to determine the present value of the quantity under measurement known as:

1. Multi-meter
2. Instrument
3. Sensitivity
4. None of the above

Correct Option: 2

26) The process of determining the amount, degree or capacity by comparison with accepted standard of the system units being used is known as:

1. Accuracy
2. Resolution
3. Measurement
4. Precision

Correct Option: 3

27) The degree of exactness of a measurement compared to the expected value is know as:

1. Accuracy
2. Resolution
3. Measurement
4. Precision

Correct Option: 1

28) The smallest change in a measured variable to which an instrument will respond is known as:

1. Accuracy
2. Resolution
3. Measurement
4. Precision

Correct Option: 2

29) ……………. Is the measure of the consistency or repeatability of measurements.

1. Accuracy
2. Resolution
3. Measurement
4. Precision

Correct Option: 4

30) The design value is also known as:

1. Measured value
2. Expected value
3. Output value
4. Input value

Correct Option: 2

31) The deviation of the true value from the desired value is known as:

1. Expected value
2. Output value
3. Error
4. Input value

Correct Option: 3

32) The ratio of the change in output of the instrument to a change in input is known as:

1. Precision
2. Sensitivity
3. Resolution
4. Accuracy

Correct Option: 2

33) If a measurement is accurate then:

1. It must not be precise
2. It must be precise
3. It is not necessary
4. None of the above

Correct Option: 2

34) If a measurement is precise then:

1. It may be precise
2. It may not be precise
3. Both a and b
4. It is not necessary

Correct Option: 3

35) A constant uniform deviation of the operation of an instrument is known as:

1. Gross error
2. Systematic error
3. Random error
4. All of the above

Correct Option: 2

36) ……………. Is one of the basic error that occurs frequently due to improper use of an instrument.

1. Gross error
2. Systematic error
3. Random error
4. None of the above

Correct Option: 1

37) …………… errors are due to conditions external to the measuring device, including conditions in the area surrounding the instrument.

1. Instrumental errors
2. Environmental errors
3. Observational errors
4. Random errors

Correct Option: 2

38) ………….. errors are inherent in measuring instruments, because of their mechanical structure.

1. Instrumental errors
2. Environmental errors
3. Observational errors
4. Random errors

Correct Option: 1

39) …………. Errors are that errors which remain after gross and systematic errors.

1. Instrumental errors
2. Environmental errors
3. Observational errors
4. Random errors

Correct Option: 4

40) Dynamic characteristics of an instrument are:

1. Speed of response
2. Fidelity
3. Dynamic error
4. All of the above

Correct Option: 4

41) The most probable value of a measured variable is the …………………………… of the number of readings taken.

1. Arithmetic mean
2. Deviation from the mean
3. Average deviation
4. Standard deviation

Correct Option: 1

42) ……………….. is the departure of a given reading from the arithmetic mean of the group of readings.

1. Arithmetic mean
2. Standard deviation
3. Average deviation
4. Deviation from the mean

Correct Option: 4

43) The ………………………….. is an indication of the precision of the instrument used in measurement.

1. Arithmetic mean
2. Standard deviation
3. Average deviation
4. Deviation from the mean

Correct Option: 3

44) Highly precise instruments yield a ……….. average deviation between readings.

1. Low
2. High
3. Medium
4. Zero

Correct Option: 1

45) The basic PMMC movement is often called D’Arsonval movement is used to measure:

1. DC only
2. AC only
3. Both DC & AC
4. None of the above

Correct Option: 1

46) The unit of sensitivity is:

1. Volt
2. Ohm
3. Volt/Ohm
4. Ohm/Volt

Correct Option: 4

47) ………………….. are instruments which measure the insulation resistance of electric circuits relative to earth and one another.

1. Series ohmmeter
2. Shunt ohmmeter
3. Megger
4. Ohmeter

Correct Option: 3

48) when the system is ………………………. The pointer makes the number of oscillations about the final position before settling down which leads waste of time.

1. Under damped
2. Over damped
3. Critically damped
4. Both a and b

Correct Option: 1

49) The galvanometer has ………. Constants.

1. 1
2. 2
3. 3
4. 4

Correct Option: 4

Author:

Mr. Paramjeet Singh Jamwal, Lecturer, Guru Nanak Education Trust Group of Institutions (GNET), Roorkee, 2011-13.