1) Instruments are subdivided into active and passive based on whether the output of instrument is produced by the quantity being measured simply changes the magnitude of some external power source. The pressure measuring device and the float-type petrol tank level indicator are example of
a. Active instruments
b. Passive instruments
c. Former is active instrument and later is passive instrument
d. Former is passive instrument and later is active instrument
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Answer
Explanation
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ANSWER: Former is passive instrument and later is active instrument
Explanation:
No explanation is available for this question!
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2) Considering cost of instruments, which is a better choice, active or passive?
a. Active instruments
b. Passive instruments
c. Cost of both active and passive instruments are approximately same
d. None of these
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3) In deadweight gauge, weights are added on the top of piston until the piston reaches a datum level. The datum level is known as
a. Null point, where the downward force balances the fluid pressure
b. Lowest point of the container
c. Highest level of fluid in the container
d. None of these
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ANSWER: Null point, where the downward force balances the fluid pressure
Explanation:
No explanation is available for this question!
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4) The accuracy of the deflection type instruments and of the null type instruments depends on
a. Linearity, calibration of spring
b. Calibration of spring, linearity and calibration of weights
c. Linearity and calibration of spring, calibration of weights
d. Both depends on calibration of weight
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Answer
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ANSWER: Linearity and calibration of spring, calibration of weights
Explanation:
No explanation is available for this question!
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5) In terms of usage, deflection type instruments are
a. More convenient than null type instrument
b. Less convenient than null type instruments
c. Both are equally convenient
d. None of these
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6) The output of an analogue instrument varies
a. Continuously and can have an infinite number of values within its range of instruments
b. In discrete steps and can have an infinite number of values within its range of instruments
c. Continuously and can have an finite number of values within its range of instruments
d. In discrete steps and can have an infinite number of values within its range of instruments
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Answer
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ANSWER: Continuously and can have an infinite number of values within its range of instruments
Explanation:
No explanation is available for this question!
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7) The microcomputer performs its computations in
a. Analogue form
b. Digital form
c. Either analogue form or digital form depending on their applications
d. None of these
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8) To read and record a measurement, the indicating type instrument
a. Always requires human intervention
b. Does not requires human intervention
c. Requires human intervention only when the instrument consists of a rotating pointer moving against a scale
d. Requires human intervention only when the instrument consists of a rotating scale moving against a pointer
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9) Accuracy of an measuring instrument indicates the
a. Closeness of the output reading to the true value
b. Ratio of output value to the input value
c. Change in output with each change in input
d. Degree of freedom from random errors
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Answer
Explanation
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ANSWER: Closeness of the output reading to the true value
Explanation:
No explanation is available for this question!
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10) If a pressure gauge of range 0-10 bar has a quoted inaccuracy of ±1.0 % of full scale reading, then it means
a. Minimum expected error in any reading is 0.1 bar
b. Maximum expected error in any reading is 0.1 bar
c. Maximum expected error in any reading is 1 bar
d. Minimum expected error in any reading is 1 bar
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Answer
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ANSWER: Maximum expected error in any reading is 0.1 bar
Explanation:
No explanation is available for this question!
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11) An instrument with a range of 0-10 bar is used for measuring pressure. If the expected value of reading is between 0 and 1 bar then the instrument will give
a. More accurate readings than the instrument with range of 0-5 bar
b. Less accurate readings than the instrument with range of 0-5 bar
c. Accuracy of reading will be same for both the instruments with range of 0-10 bar and 0-5 bar
d. None of these
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Answer
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ANSWER: Less accurate readings than the instrument with range of 0-5 bar
Explanation:
No explanation is available for this question!
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12) A voltmeter connected across a resistor gives a value of 65 V but the expected value of resistor was 68 V. Then the absolute error and the relative accuracy of the measurement will be
a. 3.2%, 96.8%
b. 3.8%, 96.2%
c. 4%, 96%
d. 4.4%, 95.59%
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13) Precision of an instrument is defined as
a. Closeness of output to the true value
b. Change in output for every change in input
c. Degree of freedom from random errors
d. Both (a) and (b)
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14) An instrument with high precision implies
a. High accuracy
b. Low accuracy
c. Does not imply anything about measurement accuracy
d. None of these
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Answer
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ANSWER: Does not imply anything about measurement accuracy
Explanation:
No explanation is available for this question!
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15) Low accuracy measurements from a high precision instrument are normally caused by
a. Bias in the measurement
b. Human errors
c. Instrumental defect
d. Low temperature
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16) Which of the following statements are correct
I. Repeatability means the closeness of output readings when the same input is applied repetitively over a short period of time, with the same measurement conditions and same instruments.
II. Reproducibility means the closeness of output readings for the same input when there are changes in the method of measurement and conditions of measurement.
a. Both I and II are correct
b. Only I is correct
c. Only II is correct
d. Both are incorrect
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17) For an instrument the degree of repeatability or reproducibility in measurements is an alternative way of expressing its
a. Precision
b. Accuracy
c. Sensitivity
d. Linearity
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18) Range or span of an instrument defines
a. Minimum value of quantity that the instrument is designed to measure
b. Maximum value of quantity that the instrument is designed to measure
c. Both minimum and maximum value of quantity that the instrument is designed to measure
d. None of these
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Answer
Explanation
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ANSWER: Both minimum and maximum value of quantity that the instrument is designed to measure
Explanation:
No explanation is available for this question!
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19) A voltmeter of 0 to 250 V has an error of ± 1% of full scale deflection. If the true voltage of voltmeter is 25 V then the range of its reading is
a. 22.5 V – 27.5 V
b. 27.5 V – 29.5 V
c. 24 V – 26 V
d. 25.5 V – 26.5 V
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20) Four observers recorded a set of current measurement as:
125.09 mA, 125.21 mA, 125.05 mA, 125.14 mA.
The range or span of error will be
a. ± 0.02 mA
b. ± 0.06 mA
c. ± 0.08 mA
d. ± 1.02 mA
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21) The output reading of an instrument is
a. Linearly proportional to the quantity being measured
b. Inversely proportional to the quantity being measured
c. Exponentially proportional to the quantity being measured
d. Not related to the quantity being measured
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Answer
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ANSWER: Linearly proportional to the quantity being measured
Explanation:
No explanation is available for this question!
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22) The sensitivity of a measurement is a measure of
a. Change in instrument output when the quantity being measured changes by a given amount
b. Closeness of output readings for the same input when there are changes in the method of measurement
c. Ratio of output to the input
d. Closeness of output reading of instrument to the true value
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Answer
Explanation
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ANSWER: Change in instrument output when the quantity being measured changes by a given amount
Explanation:
No explanation is available for this question!
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23) A speedometer typically has a threshold of about 15 km/hr. If the car starts from rest and accelerates, the speedometer will
a. Start reading from the moment the car starts
b. Start reading when the speed reaches 15 km/hr
c. Start reading when the speed reaches 30 km/hr
d. None of these
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Answer
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ANSWER: Start reading when the speed reaches 15 km/hr
Explanation:
No explanation is available for this question!
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24) In an instrument torque/weight ratio is known as
a. Sensitivity
b. Accuracy
c. Linearity
d. Fidelity
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25) If one meter A requires 80 mA to give full scale deflection and another meter B requires 60 mA to give full scale deflection, then the
a. Meter A is more sensitive
b. Both meters are equally sensitive
c. Meter B is more sensitive
d. Insufficient data
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26) To produce a change in deflection of 1.5 mm of the galvanometer of Wheatstone bridge, a change of 5Ω in the unknown arm of bridge is required. The sensitivity is
a. 0.2 mm/ Ω
b. 0.3 mm/ Ω
c. 0.4 mm/ Ω
d. 0.5 mm/ Ω
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27) Resolution of an instrument is specified as
a. Absolute value
b. Percentage of full scale deflection
c. Either (a) or (b)
d. None of these
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28) If a voltmeter can measure up to 150 V and it has 150 scale divisions where each division can read to 3/4 divisions. Then the resolution of the voltmeter is
a. 0.5 V
b. 0.25 V
c. 0.75 V
d. 1 V
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29) The smallest change which can be measured by the transducer of the range of 0 to 150 N force and resolution of 0.1% of full scale is
a. 0.1 N
b. 0.15 N
c. 0.3 N
d. 0.35 N
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30) Zero drift or bias describes the effect
a. Where the zero reading of an instrument is modified by a change in ambient conditions
b. Where the zero reading is achieved by increasing sensitivity
c. Where the zero reading is achieved by increasing linearity
d. None of these
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Answer
Explanation
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ANSWER: Where the zero reading of an instrument is modified by a change in ambient conditions
Explanation:
No explanation is available for this question!
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31) The zero drift is measured in units of
a. Volts-°c
b. Volts/°c
c. °c/volts
d. (volts)2/°c
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32) The sensitivity drift is also known as scale factor drift defines the amount by which an instruments sensitivity of measurement varies as ambient conditions change. It is measured in units of
a. (angular degree/bar)/°c
b. °c/(angular degree/bar)
c. (angular degree-bar)/ °c
d. °c/(angular degree-bar)
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33) Can an instrument suffer both zero drift and sensitivity drift at the same time?
a. Yes
b. No
c. It depends on the supply voltage
d. None of the above
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34) The non coincidence between loading and unloading curves is known as
a. Zero drift characteristics
b. Sensitivity drift characteristics
c. Hysteresis
d. Zero drift plus sensitivity drift characteristics
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35) Hysteresis most commonly occurs in instruments that contains
a. Springs
b. Electrical windings formed round on iron core
c. Both (a) and (b)
d. None of these
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36) In a measuring instrument, dead space is defined as the
a. Range of different input values over which there is no change in output values
b. Range of different output values for the same input values
c. Both (a) and (b)
d. None of these
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Answer
Explanation
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ANSWER: Range of different input values over which there is no change in output values
Explanation:
No explanation is available for this question!
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37) If an instruments exhibits hysteresis then
a. It also displays dead space
b. It will not display any dead space
c. Both (a) and (b)
d. None of these
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38) Backlash is commonly experienced in gear sets used to convert between translational and rotational motion. Backlash is a typical cause of
a. Hysteresis
b. Dead space
c. Zero drift
d. Sensitivity drift
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39) A zero order system is the one in which output changes instantaneously as the input changes. The example of zero order system is
a. Potentiometer
b. Liquid-in-glass thermometer
c. Accelerometer
d. Transducer
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40) If a balloon is equipped with temperature and altitude measuring instruments, then the order of the temperature measuring and altitude measuring instruments are
a. Zero order, first order
b. Both are first order instruments
c. Both are zero order instruments
d. First order, zero order
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