Problem 1. (20 pts) Induction Motors 1. The s is the slip and Ns is the synchronous speed, then the actual running speed

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Problem 1 20 Pts Induction Motors 1 The S Is The Slip And Ns Is The Synchronous Speed Then The Actual Running Speed 1 (86.35 KiB) Viewed 13 times

Problem 1. (20 pts) Induction Motors 1. The s is the slip and Ns is the synchronous speed, then the actual running speed of the motor will be . (a) Ns (b) s.N (c) (1-s)Ns (d) (Ns-1)s 2. The efficiency of the induction motor is? . (a) 60 to 90% (b) 80 to 90% (C) 95 to 98% (d) 99% . . 3. In the squirrel-cage induction motor, the number of slip rings is usually? (a) two (b) three (c) four (d) none 4. In a squirrel-cage induction motor, the starting torque is usually? . . (a) low (b) negligible C) same as full-load torque (d) slightly more than full-load torque . . . . 5. The Star-delta starting of motors is not usually applicable in case of? (a) single-phase motors (b) variable speed motors (C) low horsepower motors (d) high-speed motors . .