Alternating current cannot be measured by a D.C. ammeter because:
1. A.C. can not pass through D.C. Ammeter
2. A. C. changes direction
3. Average value of current for complete cycle is zero
4. D.C. Ammeter will get damaged

Subtopic:  AC vs DC |
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In an L-R circuit, the inductive reactance is equal to the resistance R of the circuit. An emf of E = E0cos(ωt) is applied to the circuit. The power consumed by the circuit is:

1. E022R

2. E024R

3. E022R

4. E028R

Subtopic:  Power factor |
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A series AC circuit has a resistance of 4 Ω and an inductor of reactance 3 Ω. The impedance of the circuit is z1. Now when a capacitor of reactance 6 Ω is connected in series with the above combination, the impedance becomes z2. z1z2 will be:

1. 1 : 1

2. 5 : 4

3. 4 : 5

4. 2 : 1

Subtopic:  Different Types of AC Circuits |
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An inductor (L) and resistance (R) are connected in series with  an AC source. The phase difference between voltage (V) and current (i) is 45°. If the phase difference between V and i remains the same, then the capacitive reactance and impedance of the L-C-R circuit will be:

1. 2R, R2

2. R, R2

3. R, R

4. 2R, R3

Subtopic:  Different Types of AC Circuits |
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What is the value of inductance L for which the current is a maximum in a series LCR circuit with C=10 μF and ω = 1000 s-1 ?

1. 10 mH
2. 100 mH
3. 1 mH
4. cannot be calculated unless R is known

Subtopic:  Different Types of AC Circuits |
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In an ideal parallel LC circuit, the capacitor is charged by connecting it to a dc source which is then disconnected. The current in the circuit will:
1. become zero instantaneously.
2. grow monotonically.
3. decay monotonically.
4. oscillate instantaneously.

Subtopic:  LC Oscillations |
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A 50 Hz a.c. source of 20 volts is connected across R and C as shown in the figure below. If the voltage across R is 12 volts, then the voltage across C will be:
   
1. 8 V
2. 16 V
3. 10 V
4. not possible to determine unless values of R and C
    are given

Subtopic:  Different Types of AC Circuits |
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A transformer has an efficiency of 90% when working on a 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil, respectively, are:

1. 300 V, 15 A

2. 450 V, 15 A

3. 450 V, 13.5 A

4. 600 V, 15 A

Subtopic:  Transformer |
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The core of a transformer is laminated because:

1. energy losses due to eddy currents may be minimized
2. the weight of the transformer may be reduced
3. rusting of the core may be prevented
4. ratio of voltage in primary and secondary may be increased
Subtopic:  Transformer |
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How much power is dissipated in an L-C-R series circuit connected to an AC source of emf E?
1.  \(\frac{\varepsilon^{2} R}{\left[R^{2}+\left(L \omega-\frac{1}{C \omega}\right)^{2}\right]}\)
2.  \(\frac{\varepsilon^{2} \sqrt{R^{2}+\left(L \omega-\frac{1}{C \omega}\right)^{2}}}{R}\)
3.  \(\frac{\varepsilon^{2}\left[R^{2}+\left(L \omega-\frac{1}{C \omega}\right)^{2}\right]}{R}\)
4.  \(\frac{\varepsilon^{2}R}{\sqrt{R^{2}+\left(L \omega-\frac{1}{C \omega}\right)^{2}}}\)

Subtopic:  Power factor |
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