Q1. | Air-core coils are practically free from | ||||||
A. | hysteresis losses [Wrong Answer] |
B. | eddy current losses [Wrong Answer] |
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C. | both (a) and (b) [Correct Answer] |
D. | none of the above [Wrong Answer] |
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Q2. | For a purely inductive circuit which of the following is true ? |
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A. | Apparent power is zero [Wrong Answer] |
B. | Relative power is zero [Wrong Answer] |
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C. | Actual power of the circuit is zero [Correct Answer] |
D. | Any capacitance even if present in the circuit will not be charged [Wrong Answer] |
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Q3. | Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla. |
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A. | 100 N [Correct Answer] |
B. | 400 N [Wrong Answer] |
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C. | 600 N [Wrong Answer] |
D. | 1000 N [Wrong Answer] |
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Q4. | Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is |
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A. | 5 mH [Wrong Answer] |
B. | 10 mH [Wrong Answer] |
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C. | 5 H [Correct Answer] |
D. | 10 H [Wrong Answer] |
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Q5. | Which of the following circuit element stores energy in the electromagnetic field? |
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A. | Inductance [Correct Answer] |
B. | Condenser [Wrong Answer] |
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C. | Variable resistor [Wrong Answer] |
D. | Resistance [Wrong Answer] |
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Q6. | The magnitude of the induced e.m.f. in a conductor depends on the |
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A. | flux density of the magnetic field [Wrong Answer] |
B. | amount of flux cut [Wrong Answer] |
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C. | amount of flux linkages [Wrong Answer] |
D. | rate of change of flux-linkages [Correct Answer] |
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Q7. | Which of the following is unit of inductance? | ||||||
A. | Ohm [Wrong Answer] |
B. | Henry [Correct Answer] |
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C. | Ampere turns [Wrong Answer] |
D. | Webers/metre [Wrong Answer] |
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Q8. | A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is |
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A. | 50 ohms [Wrong Answer] |
B. | 500 ohms [Wrong Answer] |
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C. | 1000 ohms [Wrong Answer] |
D. | 5000 ohms [Correct Answer] |
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Q9. | Which circuit element(s) will oppose the change in circuit current? |
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A. | Resistance only [Wrong Answer] |
B. | Inductance only [Correct Answer] |
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C. | Capacitance only [Wrong Answer] |
D. | Inductance and capacitance [Wrong Answer] |
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Q10. | The inductance of a coil will increase under all the following conditions except |
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A. | when more length for the same number of turns is provided [Correct Answer] |
B. | when the number of turns of the coil increase [Wrong Answer] |
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C. | when more area for each turn is provided [Wrong Answer] |
D. | when permeability of the core increases [Wrong Answer] |
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