Alternating current is transmitted to distant places at
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(a) Low voltage and high current (b) Low voltage and low current (c) High voltage and high current (d) High voltage and low current
The primary of a transformer when connected to a dc battery of 10 volt draws a current of 1mA. The number of turns of the primary and secondary windings are 50 and 100 respectively. The […]
If an A.C. mains supply is given to be 220 V, what would be the average e.m.f. during a positive half cycle?
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(a) 256 V (b) 512 V (c) 386 V (d) 198 […]
If both the resistance and the inductance in an LR AC series circuit are doubled the new impedance will be
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(a) halved (b) fourfold (c) doubled (d) quadrupled
Correct Answer:
doubled
Explanation:
For […]
The instantaneous values of alternating current and voltages in a circuit are given as i = 1/√2 sin (100πt) amper e = 1/√2 sin (100πt + π/3) Volt The average power in Watts consumed in […]
In R-L-C series circuit, the potential differences across each element is 20 V. Now the value of the resistance alone is doubled, then PD across R,L and C respectively.
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(a) 20 V, […]
The voltage of an a.c.supply varies with time (t) as V=120 sin 100 πt cos 100 πt the maximum voltage and frequency are respectively
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(a) 120 V and 100 Hz (b) 120√2 v […]
For a transformer, the turns ratio is 3 and its efficiency is 0.75. The current flowing in the primary coil is 2A and the voltage applied to it is 100 V. Then the voltage and […]
In an ac circuit an alternating voltage e = 200 √2 sin 100 t volts is connected to a capacitor of capacity 1 µF. The r.m.s. value of the current in the circuit is
If the alternating current I=I₁ cosωt+I₂ sinωt, then the rms current is given by
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(a) I₁+I₂/√2 (b) │I₁+I₂│/√2 (c) √(I₁²+I₂²/√2) (d) √I₁²+I₂²/√2
Correct Answer:
√(I₁²+I₂²/√2)
Explanation:
No explanation available. Be the first […]
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