Electro Magnetic Induction And Alternating Currents Question 298
Assertion : An electric motor will be most efficient when back e.m.f. is equal to applied e.m.f. Reason : Efficiency of electric motor is not depends only on magnitude of back e.m.f.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason are both false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: D
Solution:
Efficiency of electric motor is maximum when the back emf set up in the armature is equal to the value of the applied battery emf.
BETA
