Q. No.In an electrical circuit R, L, C, and an AC voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is . If instead, C is removed from the circuit, the phase difference is again . The power factor of the circuit is:
1. 1/2
2.
3. 1
4.
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In an AC circuit, the emf (e) and the current (I) at any instant are given respectively by
e = E0sin wt
I = I0 sin
The average power in the circuit over one cycle of AC is:
1.
2.
3.
4.
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The variation of EMF with time for four types of generators are shown in the figures. Which amongst them can be called AC?
(1) (a) and (d)
(2) (a), (b), (c), (d)
(3) (a) and (b)
(4) only (a)
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In an LR-circuit, the inductive reactance is equal to the resistance R of the circuit. An e.m.f. applied to the circuit. The power consumed in the circuit is:
(1)
(2)
(3)
(4)
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\(1 .\) \(P \left(\frac{R}{Z}\right)^{2}\)
\(2 .\) \(P \sqrt{\frac{R}{Z}}\)
\(3 .\) \(P \left(\frac{R}{Z}\right)\)
\(4 .\) \(P\)
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| I. | Readings in \(A\) and \(V_2\) are always in phase |
| II. | Reading in \(V_1\) is ahead in phase with reading in \(V_2\) |
| III. | Readings in \(A\) and \(V_1\) are always in phase |
| 1. | I only | 2. | II only |
| 3. | I and II only | 4. | II and III only |
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A coil has resistance and inductive reactance at 50 Hz frequency. If an AC source of 200 V, 100 Hz, is connected across the coil, the current in the coil will be:
1.
2.
3.
4.
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The resistance of a coil for d.c. is in ohms. In a.c., the impedance:
1. Will remain the same
2. Will increase
3. Will decrease
4. Will be zero
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A resistance of 20 ohms is connected to a source of an alternating potential V = 220 sin(). The time taken by the current to change from its peak value to r.m.s value is :
1. 0.2 sec
2. 0.25 sec
3.
4.
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The power factor of a good choke coil is:
(1) Nearly zero
(2) Exactly zero
(3) Nearly one
(4) Exactly one
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