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Free Online Mock Physics Multiple Choice Test on AC transformers
Sub Category : AC transformers Test : 3 Time Left :
1) An alternating e.m.f of angular frequency ω is applied across an inductance. The instantaneous power developed in the circuit has an angular frequency(1) ω/4 (2) 2ω (3) ω/2 (4) ω
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2) For an A.C. circuit, V = 15 sin ωt. The average power consumed in this circuit is(1) 300 W (2) Zero (3) 75 W (4) 150 W
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3) In a series LCR circuit, resistance R = 10Ω and the impedance Z = 20 Ω. The phase difference between the current and the voltage(1) 30degree (2) 60degree (3) 45degree (4) 90degree
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4) In a choke coil, the reactance XL, and resistance R are (1) XL = R (2) XL much lessthan R (3) XL much greater-than R (4) XL = ∞
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5) The resonant frequency of a circuit is f. If the capacitance is made 4 times the initial value, then the resonant frequency will become (1) 2f (2) f/2 (3) 4f (4) f/4
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