Select Chapter Topics: 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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NEET - 2019
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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. $10\sqrt{2}$ 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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A direct current of 5 A is superimposed on an alternating current I = 10$\mathrm{sin}\omega t$ flowing through a wire. The effective value of the resulting current will be:

1. $$15/2~A$$

2.

3.

4. 15 A  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 $$\omega t$$ - isin $$\omega t$$. The value of rms current is given by:
1. $$\frac{1}{\sqrt{2}}\left(i_1+i_2\right)$$
2. $$\frac{1}{\sqrt{2}}\left(i_i+i_2\right)^2$$
3. $$\frac{1}{\sqrt{2}}\left(i_1^2+i_2^2\right)^{1 / 2}$$
4. $$\frac{1}{2}\left(i_1^2+i_2^2\right)^{1 / 2}$$  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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The time required for a 50 Hz sinusoidal alternating current to change its value from zero to the r.m.s. value will be:

1. $1.5×{10}^{-2}$ $\mathrm{s}$

2. $2.5×{10}^{-3}$ $\mathrm{s}$

3. ${10}^{-1}$ $\mathrm{s}$

4. ${10}^{-6}$ $\mathrm{s}$  Subtopic:  RMS & Average Values |
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The r.m.s. value of the potential difference V shown in the figure is: 1. ${\mathrm{V}}_{0}/\sqrt{3}$

2. ${\mathrm{V}}_{0}$

3. ${\mathrm{V}}_{0}/\sqrt{2}$

4. ${\mathrm{V}}_{0}/2$  Subtopic:  RMS & Average Values |
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AIPMT - 2011
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The output current versus time curve of a rectifier is shown in the figure. The average value of the output current in this case will be: 1. 0
2. $\frac{{I}_{0}}{2}$
3. $\frac{2{I}_{0}}{\pi }$
4. I0  Subtopic:  RMS & Average Values |
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