The practical illustration of the phenomenon of mutual induction is____________?
A. A.C generator
B. D.C dynamo
C. induction coil
D. transformer
Electromagnetic Induction
The polarity of the induced voltage can be determined by using the left-hand generator rule
The polarity of the induced voltage can be determined by using the left-hand generator rule
A. Yes
B. No
Reversing the field or the current will reverse the force on the conductor
Reversing the field or the current will reverse the force on the conductor
A. Yes
B. No
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns
A. Yes
B. No
Which circuit element(s) will oppose the change in circuit current ?
Which circuit element(s) will oppose the change in circuit current ?
A. Resistance only
B. Inductance only
C. Capacitance only
D. Inductance and capacitance
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
A. variation in coil current
B. variation in voltage to the coil
C. change of number of turns of coil
D. the resistance of magnetic path
A crack in the magnetic path of an inductor will result in________________?
A crack in the magnetic path of an inductor will result in________________?
A. unchanged inductance
B. increased inductance
C. zero inductance
D. reduced inductance
The co-efficient of coupling between two air core coils depends on____________?
The co-efficient of coupling between two air core coils depends on____________?
A. self-inductance of two coils only
B. mutual inductance between two coils only
C. mutual inductance and self inductance of two coils
D. none of the above
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________?
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________?
A. 5 mH
B. 10 mH
C. 5 H
D. 10 H
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is___________?
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is___________?
A. 3500 mH
B. 350 mH
C. 250 mH
D. 150 mH