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Basic Electrical Engineering: DC Motors 2
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Basic Electrical Engineering: DC Motors 2
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25 Questions

1. In repulsion motor direction of rotation of motor
2. The starting method for a 3-phase squirrel-cage induction motor which is inferior in view of poor starting torque per ampere of line current drawn is?
3. Which of the following motor is used in the mixer?
4. What type of operations are used in the starting switches?
5. If the capacitor of a single-phase motor is short-circuited
6. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
7. The ac electrolytic capacitor is formed by winding two sheets of etched aluminium foil.
8. What is/are the advantages of the skein winding?
9. Two three phase induction motors A and B are identical in all respects except that motor A has a larger air-gap than motor B. Which motor will have more no load current?
10. Two three phase induction motors A and B are identical in all respects except that motor A has a larger air-gap than motor B. Which motor will have better full-load power factor?
11. A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. How a three phase induction motor operates when rotor frequency is greater than stator frequency?
12. What is the form of the progressive windings?
13. A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. Then the rotor emf E2 and the rotor current I2 are zero at _________
14. In a split phase motor
15. What type of operations are used in the starting switches?
16. What type of coils are used for winding the single-phase induction motor generally?
17. How are the poles and pitches in the concentric windings?
18. What kind of motor employs the skein winding made use of?
19. The rotor of a three phase induction motor can never attain synchronous speed.
20. During no load test the wattmeter reading will be _________I. stator copper loss I. stator core loss II. rotor core loss V. friction and windage losses - Rotor copper loss.
21. If use auto transformer method starting to start an induction motor to replace star-delta method, then the required tapping on the transformer will be _________
22. Which of the following motor will have relatively higher power factor?
23. A three phase induction motor is sometimes calles a generalized transformer in so far as voltage and frequency transformation has been concerned. How a three phase induction motor operates when rotor frequency is equal to stator frequency?
24. What is the range of the power factor of electrolytic capacitors?
25. The direction of rmf when a three phase supply is given to stator of three phase induction motor is?

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