Question 411. 7. A 3-phase, 4-pole squirrel cage induction motor has 36 stator and 28 rotor slots. The number of phases in the rotor is

Question 412. 0. 1f a 400V, 50Hz, star connected, 3 phase squirrel cage induction motor is operated from a 400V, 75iiz Fupply, the torque that the motor can now provide while drawing rated current from the supply?

Question 413. 1. The rotor of a three phase, 5 kW, 400V, 50Hz, slip ring induction motor is wound for 6 poles while its stator is wound for 4 poles. The approximate average no load steady state speed when this motor is connected to 400V, 50Hz supply is

Question 414. 2.  Group I lists different applications and Group II lists the motors for these applications. Match the application with the most suitable motor and choose the right combination among the choices given thereafter P Food mixer I. Permanent magnet dc motor Q Cassette tape 2. Single-phase induction recorder motor R Domestic water 3. Universal motor pump S Escalator 4. Three-phase induction motor 5. DC series motor 6. Stepper motor

Question 415. 3. No-load test on a 3-phase induction motor was conducted at different supply voltage and a plot of input power versus voltage was drawn. This curve was extrapolated to intersect the y-axis. This intersection point yields '

Question 416. 7. The direction of rotation of a 3-phase induction motor is clockwise when it is supplied with 3-phase sinusoidal voltage having phase sequence A-13-C. For counterclockwise rotation of the motor, the phase sequence of the power supply shold be

Question 417. 6. The type of single-phase induction motor having the highest power factor at full load is

Question 418. 4.  A 3-phase Induction Motor is driving a constant torque load at rated voltage and frequency. If both voltage and frequency are halved, following statements relate to the new condition if stator resistance, leakage reactance and core loss are ignored P The difference between synchronous speed and actual speed remains same Q The airgap flux remains same R The stator current remains same S The p.u. slip remains same Among the above, correct statements are

Question 419. 8.  The synchronous speed for the seventh space harmonic mmf wave of a 3-phase, 8 pole, 50 Hz induction machine is-

Question 420. 5. A single phase induction motor with only the main winding excited would exhibit the following response at synchronous speed.