a) The starting torque is one-third of the torque in case of delta connection b) During starting high losses result c) The starting torque increases and the motor runs with jerks d) None of these Ans: (a)
a) Zero starting torque b) Very small starting torque c) Medium starting torque d) Very high starting torque Ans: (b)
a) Decreased torque b) Increased torque c) Increased torque current d) Increased torque and decreased current due to increased impedance Ans: (d)
a) To reduce the magnetic resistance of the rotor b) To cool the rotor c) To reduce the electrical resistance of rotor cage d) None of these Ans: (b)
a) Smooth starting b) Higher starting torque c) Higher maximum torque d) Higher reduced starting torque Ans: (a)
a) Large slip b) Lower starting torque c) Higher power factor d) Higher efficiency Ans: (b)
a) 600 watts b) 300 watts c) 700 watts d) 1200 watts Ans: (a)
a) Makes noise b) Does not run c) Does not run d) Runs at dangerously high speed Ans: (c)
a) 6 b) 4 c) 3 d) 2 Ans: (b)
a) It is applicable only to motors having power of more than 100 kW b) It results in high losses c) With reduction in speed, the torque decreases significantly d) The speed can be controlled only very broadly Ans: (b)