The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?
(A) 3-Jan
(B) 3
(C) 1
(D) 6
Magnetic compass needle will be deflecting if it is kept near________________?
(A) Static charge
(B) Soft iron
(C) Semi-conductor
(D) Accelerating charge
A.C can not be used for_______________?
(A) producing heat
(B) producing light
(C) Magnetizing iron
(D) Producing magnetic field
A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?
(A) A torque about horizontal axis
(B) A torque about vertical axis
(C) An upward force along the axis
(D) No resultant force
The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?
(A) Magnetic flux density
(B) Torque
(C) Mutual induction
(D) Motional emf
The emf induced in a coil by a changing magnetic flux may have unit as______________?
(A) ms-1A
(B) ms-2A-1
(C) kgms2A-1
(D) kgm2s-1A-1
Power loss in actual transformer is due to_________________?
(A) Small output
(B) Eddy currents and magnetic hysterias
(C) Soft iron core
(D) Back emf
A.C and D.C have the same______________?
(A) effect in charging a capacitor
(B) effect in charging a battery
(C) effect while passing through an inductance
(D) heating effect through a resistance
If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?
(A) Vs/Vp = Np/Ns
(B) Vs/Vp = Ns/Np
(C) Vp/Vs = Ns/Np
(D) Vp/Vs = Np/Ns
A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?
(A) 0 volt
(B) 3.125 volt
(C) 31.25 volt
(D) 0.03125 volt