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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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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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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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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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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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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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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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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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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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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