DC MOTOR 5
DC Motor Quiz: Test Your Knowledge
Welcome to the DC Motor Quiz! This engaging quiz is designed to test your understanding of DC motors and generators, their operational principles, and control methods. Whether you're a student, an engineer, or an enthusiast, this quiz will challenge your knowledge and help you learn more about this essential field of electrical engineering.
Key features:
- 10 carefully crafted questions
- Multiple-choice format for interactive learning
- Instant feedback on your answers
41. The main disadvantage of the Ward-Leonard control method is __________
High initial cost
High maintenance cost
Low efficiency at light loads
All of the above
42. Which of the following can be used to control the speed of a D.C.motor?
Thermistor
Thyristor
Thyratron
Transistor
43. In a D.C.generator all of the following could be the effects of iron losses except______
Loss of efficiency
excessive heating of core
Increase in terminal voltage
Rise in temperature of ventilating air
44. Which of the following loss in a D.C.generator varies significantly with the load current?
Field copper loss
Windage loss
Armature copper loss
None of the above
45. D.C.series machine has field consisting of _______________
Many number of turns of thick wire
Many number of turns of thick wire
Few number of turns of thick wire
Few number of turns of thin wire
46. D.C.shunt motors are used for driving __________
Trains
Cranes
Hoists
Machine toools
47. In a manual shunt motor starter, ____________
Over load relay is connected in series and no volt relay in parallel with the load
Over load relay is connected in parallel and no volt relay in series with the load
Over load relay and no volt relay are both connected in series with the load
Over load relay and no volt relay are both connected in parallel with the load
48. Which of the following steps is likely to result in reduction of hysteresis loss in D.C.generator?
Providing laminations in armature core
Providing laminations in stator
Using non-magnetic material for frame
using material of low hysteresis co--efficient for armature core material
49. Which loss in a D.C.generator varies with load?
Copper loss
Eddy current loss
Hystersis loss
Windage loss
50. Which loss in a D.C.generator does not vary with load as well as flux density?
Copper loss
Eddy current loss
Hystersis loss
Windage loss
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