Computer Programming MCQs

5739 MCQs  (Page 177 of 574)

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Lenz’s law is a consequence of the law of conservation of__________?
A. Induced current
B. Charge
C. Energy
D. Induced e.m.f.
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Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?
A. 6 h
B. 8 h
C. 12 h
D. 24 h
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A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?
A. 10 v
B. 15 v
C. 25v
D. 50v
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A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?
A. 50 n
B. 120 n
C. 240 n
D. 480 n
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A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?
A. 50 ohms
B. 500 ohms
C. 1000 ohms
D. 5000 ohms
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A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
A. 0.01 s
B. 0.1 s
C. 0.5 s
D. 5 s
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Which of the fpllowing inductor will have the least eddy current losses ?
A. Air core
B. Laminated iron core
C. Iron core
D. Powdered iron core
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Two 300 uH coils in series without mutual coupling have a total inductance of___________?
A. 300 uh
B. 600 uh
C. 150 uh
D. 75 uh
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An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?
A. 20 wb
B. 2 wb
C. 0.2 wb
D. 0.02 wb
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Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla
A. 100 n
B. 400 n
C. 600 n
D. 1000 n
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Word of the Day
22 Jul
Combative
ready or eager to fight or argue.
لڑاکا، متنازع، جھگڑالو

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