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1) Range or span of an instrument defines the 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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2) 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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3) 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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4) 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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5) 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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6) A speedometer typically has a threshold of about 15 km/hr. If the car starts from rest and accelerates, the speedometer will a. Starts reading from the moment the car starts b. Starts reading when the speed reaches 15 km/hr c. Starts reading when the speed reaches 30 km/hr d. None of these
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7) In an instrument torque / weight ratio is known as a. Sensitivity b. Accuracy c. Linearity d. Fidelity
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8) If the deflection torques on moving system increases then the controlling torque a. Increases b. Decreases c. Remains same d. None of these
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9) In the absence of the restoring torque, the pointer a. Will not deflect from its initial position b. Will deflect but would not return to its zero position on removing current c. Will deflect and return to its zero position on removing current d. Will swing from minimum to maximum position
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10) The scale of PMMC type instruments is a. Uniform b. Non - uniform c. Cramped at the lower ends d. Crowded in the middle
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11) An ac voltage source of 2sint V is connected in series with a dc voltage source of 5 V. If a PMMC instrument is connected in parallel to this combination then the reading of meter will be equal to a. 7 V b. 5 V c. 5.2 V d. 25 V
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12) The deflecting torque in a moving coil instrument is a. Directly proportional to the current flowing through it b. Inversely proportional to the current flowing through it c. Inversely proportional to the square of current flowing through it d. Directly proportional to the square of current flowing through it
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13) When an AC signal is applied across the permanent magnet moving coil voltmeter, then the pointer will a. Not deflect b. Oscillate around zero volt c. Deflect to its maximum d. Oscillate from minimum to maximum value
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14) If the control spring of PMMC instrument is replaced by another spring whose spring constant is higher than the previous one, then the damping ratio and natural frequency a. Increases, decreases b. Increases, increases c. Decreases, decreases d. Decreases, increases
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15) A PMMC instrument can be used as ammeter and as voltmeter with the help of a. A low resistance shunt, a low series resistance b. A low resistance shunt, a high series resistance c. A high series resistance, a low resistance shunt d. A low series resistance, a high shunt resistance
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16) In a PMMC instrument, if the control springs are eliminated the instrument can be used for measuring the quantity of electricity passed through the coil. This method is used for a. Ammeter b. Voltmeter c. Fluxmeter d. Ballistic galvanometer
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17) In Wheatstone bridge method, the instrument used as null detector is a. Ammeter b. Voltmeter c. Galvanometer d. All of these
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18) In a Wheatstone bridge method, the bridge is said to be balanced, when the current through the galvanometer is a. 1 A b. 0 A c. Maximum d. Half of the maximum value
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19) In Maxwell’s Inductance - Capacitance bridge, the frequency ω a. Is directly proportional to the inductance in the balanced equation b. Is inversely proportional to the capacitance in the balanced equation c. Is directly proportional to the product of inductance and capacitance d. Does not appear in the balanced equations
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20) The Maxwell’s Inductance - Capacitance bridge is not suitable for the measurement inductance of coil if the Q factor is a. Less than 1 b. Between 1 to 10 c. More than 10 d. Both (a) and (c)
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