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Class 12 Physics
Alternating Current Chapter 7
Quiz 1
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Virtual value or effective value of a.c. is
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-0.637I0
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-0.707I0
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0.637I0
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0.707I0
Given the instantaneous value of current from a.c. source is I = 8 sin 623t. Find the r.m.s value of current
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5.656 A
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8 A
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2.848 A
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1.414 A
What is time constant
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characteristic time with which current grows and decays
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the time current takes to reach the minimum value only
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time for the complete cycle
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the time current takes to reach the peak value only
Find the instantaneous voltage for an a.c. supply of 200V and 75 hertz
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E = 282.8 sin 50πt
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E = 282.8 sin 150πt
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E = 282.8 sin 75πt
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E = 282.8 sin 100πt
Which phasor represents the relationship between alternating current and alternating e.m.f. for a resistance?
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B
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A
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Both A and B
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Neither A nor B
Alternating current is represented by
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A
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B
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C
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D
What is the relationship between Em and E0
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Em=-0.537 E0
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Em=-0.737 E0
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Em=-0.637 E0
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Em=-0.707 E0
The only component that dissipates energy in ac circuit is:
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Capacitor
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Inductor
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Resistors
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None of these
Which is more dangerous?
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220 V a.c
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220 V d.c
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Both 220 V a.c. and 220 V d.c
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Both 220 V a.c. and 220 V d.c. are not dangerous
The average power dissipation in pure resistive circuit is:
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A
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B
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C
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D
0 h : 0 m : 1 s
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