It is required to measure the true open circuit e.m.f. of a battery. The best device is_____________?
A. D.c. voltmeter
B. Ammeter and a known resistance
C. D.c. potentiometer
D. None of the above
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An ohmmeter is a____________?
A. Moving iron instrument
B. Moving coil instrument
C. Dynamometer instrument
D. None of the above
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Murray loop test can be used for location of________________?
A. Ground fault on a cable
B. Short circuit fault on a cable
C. Both the ground fault and the short-circuit fault
D. None of the above
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In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was___________?
A. Unity
B. 0.8 lagging
C. 0.8 leading
D. Zero
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Which of the following is an essential part of a motor meter ?
A. An operating torque system
B. A braking device
C. Revolution registering device
D. All of the above
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The household energy meter is_______________?
A. An indicating instrument
B. A recording instrument
C. An integrating instrument
D. None of the above
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An ammeter is a______________?
A. Secondary instrument
B. Absolute instrument
C. Recording instrument
D. Integrating instrument
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The switch board instruments________________?
A. Should be mounted in vertical position
B. Should be mounted in horizontal position
C. Either a. or b.
D. Neither a. nor b.
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The pointer of an indicating instrument should be______________?
A. Very light
B. Very heavy
C. Either a. or b.
D. Neither a. nor b.
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Which of the following meters are not used on D.C. circuits______________?
A. Mercury motor meters
B. Commutator motor meters
C. Induction meters
D. None of the above
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Word of the Day
17 Sep
Ghastly
causing great horror or fear.
بھیانک، خوفناک، ڈراﺅنا

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