Question 51 : Calculate the inductance in an inductive circuit whose time constant is 2s and the resistance is 5 ohm.
1. 10H
2. 20H
3. 5H
4. 15H
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Question 52 : Calculate the resistance in an inductive circuit whose time constant is 2s and the inductance is 10H.
1. 7ohm
2. 10ohm
3. 2ohm
4. 5ohm
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Question 53 : Calculate the time constant of an inductive circuit having resistance 5 ohm and inductance 10H.
1. 2s
2. 4s
3. 5s
4. 10s
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Question 54 : What is the time constant of an inductive circuit?
1. LR
2. R/L
3. 1/LR
4. L/R
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Question 55 : The charging time constant of a circuit consisting of an inductor is the time taken for the voltage in the inductor to become __________ % of the initial voltage.
1. 33
2. 63
3. 37
4. 36
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Question 56 : Among the following, which is the right formula for growth in an inductive circuit?
1. VL=V(1-e^-tR/L)
2. VL=(e^-tR/L)
3. VL=(1-e^-tR/L)
4. VL=V(e^-tR/L)
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Question 57 : In a pure inductive circuit, the power factor is?
1. Maximum
2. Minimum
3. 0
4. Infinity
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Question 58 : Calculate the final flux in an inductor having inductance 4000 H, number of turns is 200 and the current changes from 5A to 7A. The initial flux is 760 Wb.
1. 200 Wb
2. 400 Wb
3. 600 Wb
4. 800 Wb
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Question 59 : Calculate the change in flux of an inductor having inductance 4000 H, number of turns is 200 and the current changes from 5A to 7A.
1. 20 Wb
2. 40 Wb
3. 60 Wb
4. 80 Wb
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Question 60 : Calculate the initial current in an inductor having inductance 4000 H, number of turns is 200 and the flux changes from 760 to 800 Wb. Current changes to 7A.
1. 10A
2. 2A
3. 3A
4. 5A
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