A coil inducesmV when the current changes at the rate of 1 A/s. The value of inductance is
3500 mH
350 mH
250 mH
150 mH
Q.3.
Current changing from 8 A toA in one second inducedvolts in a coil. The value of inductance is
5 mH
10 mH
5 H
10 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.
Two coils have self-inductances ofH 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.6.
Two coils have inductances of 8 mH andmH and a coefficient of coupling of 0.If the two coils are connected in series aiding, the total inductance will be
32 mH
38 mH
40 mH
48 mH
Q.7.
If current in a conductor increases then according to Lenz's law self-induced voltage will
Aid the increasing current
Tend to decrease the amount of current
Produce current opposite to the increasing current
Aid the applied voltage
Q.8.
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.9.
The polarity of the induced voltage can be determined by using the left-hand generator rule.
Yes
No
Q.10.
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.11.
Find the force acting on a conductorlong carrying a current ofamperes at right angles to a magnetic field having a flux density of 0.tesla
100 N
400 N
600 N
1000 N
Q.12.
Which of the following inductor will have the least eddy current losses?
Air core
Laminated iron core
Iron core
Powdered iron core
Q.13.
Which of the following circuit element stores energy in the electromagnetic field?
Inductance
Condenser
Variable resistor
Resistance
Q.14.
An e.m.f. ofvolts 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.15.
Aturn coil has an inductance ofmH. If the number of turns is increased toturns, all other quantities (area, length etc.) remaining the same, the inductance will be
6 mH
146 mH
24 mH
48 mH
Q.16.
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.17.
Which of the fpllowing inductor will have the least eddy current losses ?
Air core
Laminated iron core
Iron core
Powdered iron core
Q.18.
Increasing the field or increasing the current will decrease the force on the conductor.
Yes
No
Q.19.
A moving magnetic field will produce the same effect as a conductor that is moving.
True
False
Q.20.
Aturns solenoid develops an average induced voltage ofV. Over what time interval must a flux change of 0.Wb occur to produce such a voltage?
0.01 s
0.1 s
0.5 s
All of above
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