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
Q.2
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
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
Q.4
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
Q.5
Higher the self-inductance of a coil,
Q.6
The polarity of the induced voltage can be determined by using the left-hand generator rule.
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
Q.8
Mutually inductance between two magnetically coupled coils depends on
Q.9
For a purely inductive circuit which of the following is true?
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
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
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
Q.13
Which of the following circuit element stores energy in the electromagnetic field?
Q.14
Increasing the field or increasing the current will decrease the force on the conductor.
Q.15
A moving magnetic field will produce the same effect as a conductor that is moving.
Q.16
Which of the following is not a unit of inductance?
Q.17
Which of the following is unit of inductance?
Q.18
Which of the fpllowing inductor will have the least eddy current losses ?
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?
Q.20
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
0 h : 0 m : 1 s