A) 78 A B) 48 A C) 38 A D) 10 A. Ans : (C)
A) 3 to 5 wb/m2 B) 2 to 2.9 wb/m2 C) 1 to 1.9 wb/m2 D) 0.35 to 0.6 wb/m2. Ans : (D)
A) power factor remains practically unchanged B) power factor goes on increasing upto rated load on then it starts falling C) power factor goes on increasing even beyond full load D) power factor goes on decreasing. Ans : (B)
A) slip should be zero B) slip should be 50% C) slip should be such that rotor reactance per phase is equal to the product of slip and rotor resistance per phase D) slip should be such that rotor reactance per phase is equal to the resistance per phase. Ans : (D)
A) 10 kV B) 1000 V C) 440 V D) 250 V. Ans : (B)
A) single phasing B) unbalancing C) hunting D) crawling. Ans : (A)
A) Die casted aluminium rotor B) Squirrel cage rotor using rectangular copper bars C) Squirrel cage rotor using round copper bars D) Wound rotor. Ans : (D)
A) 0o electrical B) 30o electrical C) 45o electrical D) 60o electrical. Ans : (D)
A) Stator-rotor starting B) Direct on line starting C) Star-delta starting D) Auto-transformer starting. Ans : (B)
A) semi-closed slots with parallel teeth B) closed slots with parallel teeth C) open slots with tapered teeth D) open slots with parallel teeth. Ans : (A)