(A) The voltage of direct current
(B) The voltage of alternating current
(C) The electrical energy
(D) The magnetic field
Tag: Physics Mcqs
A dynmo converts:
(A) Electrical energy into mechanical energy
(B) Mechanical energy into electrical energy
(C) Heat Energy into electrical energy
(D) Magnetic energy into electrical energy
The magnitude of the emf induced in the coil of A.C. generator is given by:
(A) ε = NBA sin ωt
(B) ε = NBA sin ωt / ω
(C) ε = NBAω sin ωt
(D) ε = B sin ωt / NAω
A 50 mH coil carries a current of 2 amps. The energy stored in its magnetic field is:
(A) 0.05 J
(B) 0.1 J
(C) 10 J
(D) 100 Joules
One henry can be defined as:
(A) 1 henry = Amp-sec / volt
(B) 1 henry = Volt-sec / Amp
(C) 1 henry = Volt x Amp-sec
(D) 1 henry = Volt / Amp-sec
Mutual inductance has a practical role in the performance of the:
(A) Radio choke
(B) A.C. generator
(C) D.C. generator
(D) Transformer
Two inductance coils, of same self-inductance, L are connected in parallel and the distance between them is large. The resultant self-inductance of the coil will be:
(A) L/2
(B) L/4
(C) 2L
(D) L
The value of the current in the armature of a DC motor is maximum when the motor:
(A) starts rotating with mean speed
(B) has gained full speed
(C) is switched off
(D) just starts rotating