a) 48 b) 12 c) 24 d) None Ans: (d)
a) ƒ = PN/120 b) ƒ = PN/60 c) ƒ = P/60N d) ƒ = N/60P Ans: (a)
a) zero b) positive c) negative d) ideally infinite Ans: (c)
a) kVA becomes leading b) kVA become lagging c) kW will change d) pf of the load remains unaltered Ans: (b)
a) more than one b) equal to zero c) negative d) none of these Ans: (c)
a) damped bars b) flywheel c) machines having suitable synchronization power d) all of these Ans: (d)
a) reactance equal to resistance b) reactance less than resistances c) reactance greater than resistances d) none of these Ans: (d)
a) larger in size b) smaller in size c) cheaper d) costlier Ans: (b)
a) voltage matching b) frequency matching c) phase difference matching d) phase sequence matching Ans: (b)
a) armature handles very large currents and high voltages b) armature friction deep slots to accommodate large coils is easy if armature is kept stationary c) easy of cooling the stator than rotor d) none of these Ans: (d)