31. Any charge given to the battery when taken off the vehicle is called :
(A) trapped charge
(B) float charge
(C) step charge
(D) trickle charge
32. In synchronous machines, the salient poles are :
(A) rotating field winding
(B) stationary field winding
(C) rotating armature winding
(D) stationary armature winding
33. A moving electric charge will produce :
(A) Electric field only
(B) Magnetic field only
(C) Both electric field and magnetic field
(D) Electrostatic lines of force
34. Which of the following materials are used as control rods and coolant respectively in nuclear power station ?
(A) Uranium and Sodium
(B) Cadmium and Sodium
(C) Graphite and Cadmium
(D) Graphite and Sodium
35. Which of the following is likely to have the largest resistance ?
(A) Moving coil galvanometer
(B) Voltmeter of range 10V
(C) Ammeter of range 1 A
(D) 1 mA Ammeter