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 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 instruments 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) The electromagnetic effect is generally utilized for a. Ammeters b. Voltmeters c. Wattmeters and watt - hour meters d. All of these
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10) The electrostatic effect is utilized for a. Ammeters b. Voltmeters c. D.C. ampere - hour meters d. Wattmeters
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11) The instrument which can be used only with the D.C. supply is a. PMMC instrument b. Electrodynamometer instrument c. Hot - wire instrument d. Split phase induction type instrument
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12) The instrument which can be used only with the A.C. supply is / are a. Induction type b. Electrostatic type c. Electrodynamometer type d. All of these
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13) In a hot wire ammeter the current flowing through the resistance of 10 Ω is given by (I = 3 + 2 sin 300 t A) The measured value of current will be a. 2.98 A b. 3.31 A c. 3.62 A d. 4.01 A
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14) In a hot wire instrument, readings are a. Dependent on frequency b. Dependent on waveform c. Dependent on both frequency and waveform d. Independent of both frequency and waveform
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15) To convert a 2 mA meter with internal resistance of 120 ohm into an ammeter of range 0 – 200 mA, the value of shunt resistance required is a. 1.121 ohm b. 1.212 ohm c. 1.312 ohm d. 1.414 ohm
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16) If a moving iron instrument is to be used as ammeter then the coil has a. Fewer number of turns of thin wire b. Fewer number of turns of thick wire c. Larger number of turns of thin wire d. Larger number of turns of thick wire
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17) If the direction of current through the coil is upward, then the iron disc will be magnetized in such a way that it is a. Pushed outwards b. Pushed upwards c. Pushed downwards d. Pulled inwards
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18) In the given options, the secondary fundamental unit is a. Length b. Luminous intensity c. Plane angle d. Time
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19) Bridge circuits are used for the measurement of a. Resistance b. Inductance c. Capacitance d. All of these
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20) Low resistance is the resistance of the order of a. 1 ohm and less than 1 ohm b. 1 ohm to 1 mega ohm c. More than one ohm d. None of these
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