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Electrician Practice Test: DC Machine (Generator & Motor)
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Electrician Practice Test: DC Machine (Generator & Motor)
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25 Questions

1. What is the speed, if field winding of a DC shunt motor is in open circuit?
2. What is the best method to change the DOR of a compound motor without change of its characteristics?
3. Which speed control methods offers below normal speed in DC shunt motor?
4. Which winding wire is used for DC field coil?
5. Which rule is used to find direction of magnetic field?
6. Which rule is used to find the direction of induced emf in DC Generator?
7. What is the effect, if a four point starter resistance is cutoff during running?
8. Calculate the emf genarated in a 4 pole DC generator with simplex wave wound armature has 1020 conductors and driven at a speed of 1500 rpm, the flux / pole is 0.007 webers?
9. Which insulating material used in winding is a highly non -hygroscopic and possess good electrical strength?
10. Which rule determines the direction of rotation of armature in DC motor?
11. Why carbon composition brush requires in the armature circuit to operate the DC motor?
12. What is the effect if the shunt field resistance is above critical resistance value in a DC Generator?
13. Why solid pole shoes are used in DC Generator?
14. What is the principle of DC Generator?
15. Which metal is used to make pole core of large DC generator ?
16. Why the terminal voltage decreases if load increases in DC shunt generator?
17. Which type of armature winding is illustrated given below?
18. Which instrument is used to measure armature winding resistance?
19. How the effect of armature reaction can be neutralized in large DC generators?
20. Which energy is converted into electrical energy by generator?
21. What is the temperature value of class ‘F’ insulation?
22. Which type of DC Generator works in absence of residual magnetism?
23. Why armature resistance of a DC Generator is very low?
24. Which speed control system provides a smooth variation of speed from zero to above normal?
25. What is the effect in DC Generator, if it is kept ideal for long time?

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