The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?

(a) (b)
(c) (d)


1. (a) and (d)

2. (a), (b), (c) and (d)

3. (a) and (b)

4. only (a)

Subtopic:  AC vs DC |
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An AC ammeter is used to measure the current in a circuit. When a given direct current passes through the circuit, the ac ammeter reads 6 A. When another alternating current passes through the circuit, the AC ammeter reads 8 A. Then the reading of this ammeter if DC and AC flow through the circuit simultaneously is:

1. 102 A

2. 14 A

3. 10 A

4. 15 A

Subtopic:  AC vs DC |
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In the diagram, two sinusoidal voltages of the same frequency are shown. What is the frequency and the phase relationship between the voltages?
      

Frequency in Hz Phase lead of N over M in radians
1. 0.4 –π/4
2. 2.5 –π/2
3. 2.5 +π/2
4. 2.5 –π/4
Subtopic:  AC vs DC |
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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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A direct current of 5 A is superimposed on an alternating current I = 10sinωt flowing through a wire. The effective value of the resulting current will be:

1. \(15/2~A\)

2. 5A

3. 5A

4. 15 A

Subtopic:  AC vs DC |
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In a heating arrangement, an alternating current having a peak value of 28 A is used. To produce the same heat energy, if direct current is used to produce the same amount of heat, then its magnitude will be:

1. about 14 A

2. about 28 A

3. about 20 A

4. cannot say

Subtopic:  AC vs DC |
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A generator produces a voltage that is given by V = 240 sin 120 t, where t is in seconds. The frequency and r.m.s. voltage are:

1. 60 Hz and 240 V

2. 19 Hz and 120 V

3. 19 Hz and 170 V

4. 754 Hz and 70 V

Subtopic:  RMS & Average Values |
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An alternating current is given as i = icos ωt - i2 sin ωt. The value of rms current is given by:

1.  i1 + i22 

2.  i1 + i22

3.  i12 + i222 

4.  i12 + i222

Subtopic:  RMS & Average Values |
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The peak value of an alternating e.m.f. E=E0 sin ωt is 10 volt and its frequency is 50 Hz. At a time \(t=\frac{1}{600}~s,\) the instantaneous value of the e.m.f. will be:

1. 1 volt

2. 53 volt

3. 5 volt

4. 10 volt

Subtopic:  RMS & Average Values |
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The variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit are shown in the figure. Which of the following statements is correct?

1. The voltage lags behind the current by π/2.

2. The voltage leads the current by π/2.

3. The voltage and the current are in phase.

4. The voltage leads the current by π.

Subtopic:  RMS & Average Values |
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