RME Technical Subjects Test 11

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#1. The mechanical power developed by the DC motor is maximum when ________.

#2. The speed of DC series motor at no load is _____ .

#3. Power transformers are designed to have maximum efficiency at __________.

#4. In a given machine. How may the no? Of parallel paths be increased in the armature of lop connected.

#5. Which of the following motors has high starting torque?

#6. A magnet is being heated to a temperature of 460°. What do you think will happen?

#7. The resistance of low voltage side of a transformer __________.

#8. In a squirrel cage induction motor, which component is NOT a part of the motor?

#9. In a DC circuit, the ratio of watts to voltamperes is always _________.

#10. On a delta three-phase four-wire secondary, how many hot wires may use the common neutral?

#11. The dummy coil in the DC machines is used to ___________.

#12. In a small dc machine, armature slots are sometimes not made axial but skewed. Though skewing makes winding a little more difficult, yet it result in_______________________.

#13. Transformers are rated in ___________.

#14. Which of the following is a correct statement about eddy currents?

#15. The basic property of the transformer is that it changes the voltage level of an a.c. signal _______.

#16. How many contactor is needed to reverse the rotation of a three phase motor _____ .

#17. A hot smoky motor is a good indication of:

#18. What is standard instrument to measure the speed of a motor?

#19. In the design of Power Supply, transformer should not be place near the component because of vibration/humming due to _______.

#20. Which of the statement given below is true about autotransformer?

#21. A part of a generator that links the generator to the prime mover __________.

#22. What should be the possible no. of poles to obtain the highest operating speed?

#23. With a 3Ø delta-wye connected transformer 480 V primary, 208/120 V secondary, the secondary line current is ________.

#24. What is the common method of cooling transformer?

#25. What type of core is used for a high frequency transformer?

#26. If the field of a synchronous motor is under excited the Power factor will be _____ .

#27. For the equal output the total current is more in ______ .

#28. Preferably, the resistance between the primary and the secondary of a transformer should be ___________.

#29. The function of commutator in DC generator is _____ .

#30. The standard method of controlling the output voltage of a 440 V, 60 Hz AC generator is accomplished by adjusting the ____________.

#31. A generator has a commercial efficiency of 95% and a mechanical efficiency of 97%. Find the electrical efficiency.

#32. What is the turns ratio on a three-phase, four wire 480/240/120 volt transformer?

#33. Transformer core uses small frequency because is laminated _________.

#34. The transformer oil used in a transformer provides ____________.

#35. Electric power is transformed from one coil to the other coil in a transformer ______.

#36. Electric motors are rated in ________.

#37. A 25-hp engine drives a DC generator, if the generator has an efficiency of 84%, how much does it deliver?

#38. In any transformer the voltage per turn in primary and secondary remains ___________.

#39. _______________ the slot teeth will make the DC generator quieter in operation.

#40. In practice the rotation of electric motor referred to its back is ______ .

#41. Which transformer has only one winding?

#42. What is common in the two windings of a transformer?

#43. Which of the following motor is used in the Electric train?

#44. The stray losses in the transformer will be reduces if _____ .

#45. A 25 kVA, 2400/240 volt transformer has a primary current of 10 A. What is the secondary current?

#46. Which among the following types of motor with same power rating having the same voltage level is the heaviest?

#47. What is the equation for the DC generator?

#48. A transformer is more efficiently utilized when the load has a ______ power factor.

#49. A generator may lost residual magnetism because of excessive ______.

#50. The size of a transformer core will depend on _____________.




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