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)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn 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. A
2. 14 A
3. 10 A
4. 15 A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA direct current of 5 A is superimposed on an alternating current I = 10 flowing through a wire. The effective value of the resulting current will be:
1. \(15/2~A\)
2.
3.
4. 15 A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology