Which of the following inductor will have the least eddy current losses?
Select an option to see the answer and solution.
Electrical Engineering · all questionsElectromagnetic Induction
Electromagnetic Induction
practice.
Practice every MCQ with options. Use Show answers when you want the correct option and solution.
45
Questions
2/3
Page
Pick an option on a question to see the right answer and solution.
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
Select an option to see the answer and solution.
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
Select an option to see the answer and solution.
The polarity of the induced voltage can be determined by using the left-hand generator rule.
Select an option to see the answer and solution.
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
Select an option to see the answer and solution.
If current in a conductor increases then according to Lenz's law self-induced voltage will
Select an option to see the answer and solution.
Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
Select an option to see the answer and solution.
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
Select an option to see the answer and solution.
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
Select an option to see the answer and solution.
Mutually inductance between two magnetically coupled coils depends on
Select an option to see the answer and solution.
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is
Select an option to see the answer and solution.
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
Select an option to see the answer and solution.
Higher the self-inductance of a coil,
Select an option to see the answer and solution.
The inductance of a coil will increase under all the following conditions except
Select an option to see the answer and solution.
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.
Select an option to see the answer and solution.
As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
Select an option to see the answer and solution.
The coefficient of coupling between two air core coils depends on
Select an option to see the answer and solution.
Air-core coils are practically free from
Select an option to see the answer and solution.
A laminated iron core has reduced eddy-current losses because
Select an option to see the answer and solution.
In case of an inductance, current is proportional to
Select an option to see the answer and solution.