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Free Online Mock Physics Multiple Choice Test on AC transformers
Sub Category : AC transformers Test : 2 Time Left :
1) In a circuit containing an inductance of zero resistance, the e.m.f. applied leads the current by(1) 45degree (2) 60degree (3) 90degree (4) 30degree
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2) In an A.C. circuit containing an inductance only, the current(1) Lags behind the e.m.f by π rad (2) Leads the e.m.f. by π rad (3) Lags behind the e.m.f by π/2 rad (4) Leads the e.m.f. by π/2 rad
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3) A resistance of 300 Ω and in inductance of 1/π henry are connected in series to an alternating voltage of 20 V and 200 Hz frequency. The phase angle between the voltage and current is tan power-1(3/4) (2) tanpower-1(3/2) (3) tanpower-1 (4/3) (4) tan power-1 2/3)
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4) The power factor of LCR circuit at resonance is
(1) 0.707 (2) 0.5 (3) 1 (4) Zero
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5) The natural frequency of a circuit containing L and C is (1) 1/2pi square root LC (2) 1/2pi square root L/C (3) 1/2pi squar root LC (4) 1/2pi square root C/L
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