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Electrical Engineering
Electromagnetic Induction
Quiz 2
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Q.1
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
100 N
400 N
600 N
1000 N
Q.2
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
Unaffected
Doubled
Halved
Quadrupled
Q.3
Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be
6 H
8 H
12 H
24 H
Q.4
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
Variation in coil current
Variation in voltage to the coil
Change of number of turns of coil
The resistance of magnetic path
Q.5
Higher the self-inductance of a coil,
Lesser its weber-turns
Lower the e.m.f. induced
Greater the flux produced by it
Longer the delay in establishing steady current through it
Q.6
The polarity of the induced voltage can be determined by using the left-hand generator rule.
Yes
No
Q.7
A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be
10 V
15 V
25 V
50 V
Q.8
Mutually inductance between two magnetically coupled coils depends on
Permeability of the core
The number of their turns
Cross-sectional area of their common core
All of the above
Q.9
For a purely inductive circuit which of the following is true?
Apparent power is zero
Relative power is zero
Actual power of the circuit is zero
Any capacitance even if present in the circuit will not be charged
Q.10
The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be
3 mH
12 mH
24 mH
48 mH
Q.11
A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be
6 mH
146 mH
24 mH
48 mH
Q.12
An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
64 A/s
32 A/s
16 A/s
4 A/s
Q.13
Which of the following circuit element stores energy in the electromagnetic field?
Inductance
Condenser
Variable resistor
Resistance
Q.14
Increasing the field or increasing the current will decrease the force on the conductor.
Yes
No
Q.15
A moving magnetic field will produce the same effect as a conductor that is moving.
True
False
Q.16
Which of the following is not a unit of inductance?
Henry
Coulomb/volt ampere
Volt second per ampere
All of the above
Q.17
Which of the following is unit of inductance?
Ohm
Henry
Ampere turns
Weber/metre
Q.18
Which of the fpllowing inductor will have the least eddy current losses ?
Air core
Laminated iron core
Iron core
Powdered iron core
Q.19
A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage?
0.01 s
0.1 s
0.5 s
Q.20
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
50 ohms
500 ohms
1000 ohms
5000 ohms
0 h : 0 m : 1 s
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