Question 81 : For a coil having a magnetic circuit of constant reluctance, the flux is ___________ to the current.
1. Directly proportional
2. Inversely proportional
3. Not related
4. Very large compared to
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Question 82 : Among the following, which is the right formula for inductance of N turns?
1. L=et/Ni
2. L=N*i *e*t
3. L=Ni/et
4. L=N/iet
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Question 83 : Among the following, which is the right formula for inductance?
1. L=emf*t/I
2. L=emf/t*I
3. L=emf*I/t
4. L=emf*t*I
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Question 84 : An induced emf is said to be ________
1. Inductive
2. Capacitive
3. Resistive
4. Cannot be determined
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Question 85 : What is the unit for inductive reactance?
1. Henry
2. Ohm
3. Farad
4. Volts
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Question 86 : If tan ? = 10 and the resistance is 2 ohm, calculate the inductive reactance.
1. 10 ohm
2. 20 ohm
3. 30 ohm
4. 40 ohm
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Question 87 : If the resistance in a circuit is 2 ohm and the impedance is 20 ohm, calculate the power factor.
1. 1/10
2. 1/20
3. 1/30
4. 1/40
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Question 88 : If the power factor is 1/10 and the value of impedance is 20 ohm, calculate the resistance in the circuit.
1. 1 ohm
2. 2 ohm
3. 3 ohm
4. 4 ohm
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Question 89 : In a pure inductive circuit, the power factor is __________
1. Maximum
2. Minimum
3. 0
4. Infinity
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Question 90 : If the current and voltage are 90 degrees out of phase, the power factor will be?
1. 0
2. Infinity
3. 1
4. Insufficient information provided
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