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1) If an electrostatic voltmeter is used on AC circuit and has non uniform waves, then it will read a. Average values b. RMS values c. Peak values d. All of these
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2) In electrostatic instruments iron is not used in their construction. These instruments are a. Free from hysteresis and eddy current losses b. Free from temperature errors c. Dependent on temperature errors d. Both (a) and (b)
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3) The range of electrostatic voltmeter can be extended by using a. Resistance potential divider method b. Capacitance potential divider method c. Both (a) and (b) d. None of these
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4) The resistance potential divider method and capacitance potential divider method is used for a. Both AC and DC b. Former method can be used for both AC and DC and the later method can be used only for AC c. Former method can be used for AC only and the later method can be used for both AC and DC d. Former method can be used for DC only and the later method can be used only for AC
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5) The indicating instruments with linear scale is a. PMMC b. Electrostatic instrument c. Dynamometer instrument d. Thermocouple instrument
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6) In the given options, the secondary fundamental unit is a. Length b. Luminous intensity c. Plane angle d. Time
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7) Plane angle and solid angle are a. Primary fundamental units b. Secondary fundamental units c. Supplementary units d. Derived units
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8) The unit of luminance is a. Lumen b. Candela per square meter c. Lux d. Lumen per square meter
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9) By the surface, the solid angle subtended at the centre of a sphere, whose area is equal to the surface of the radius of the sphere is known as a. Radian b. Steradian c. Candela d. Lux
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10) At the centre, the plane angle subtended by an arc of a circle equal to the radius of the circle is known as a. Steradian b. Candela c. Lumen d. Radian
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11) Bridge circuits are used for the measurement of a. Resistance b. Inductance c. Capacitance d. All of these
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12) 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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13) The example of low resistance is/are a. Resistance of armature windings of electrical machine b. Resistance of series field winding of a dc machine c. Resistances of shunts and lead wires d. All of these
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14) The accuracy in a bridge measurement depends on a. Sensitivity of detector b. Applied voltage c. Accuracy of indicator d. Both (a) and (b)
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15) The high resistances are found in a. Insulation resistance of cables and wires b. Resistance of shunt field winding and the multipliers c. Resistance of armature windings of electrical machine d. Resistance of series field winding of a dc machine
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16) A null type of bridge with dc excitation is commonly known as a. Wheatstone bridge b. Anderson bridge c. Wien bridge d. Schering bridge
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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) The sensitivity of Wheatstone bridge is defined as ratio of a. Deflection of the galvanometer to the unit fractional change in the value of unknown resistance b. Square of the deflection of the galvanometer to the unit fractional change in the value of unknown resistance c. Deflection of the galvanometer to the twice of the unit fractional change in the value of unknown resistance d. Unit fractional change in the value of unknown resistance to the deflection of the galvanometer
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20) The sensitivity of the bridge is maximum when a. P/R = Q/S = 0 b. P/R = 1 c. Both (a) and (b) d. None of these
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