AP ECET ELECTRICAL AND ELECTRONICS ENGINEERING (EEE) Multiple Choice Questions (MCQs)
AP ECET Electrical and Electronics Engineering (EEE) - Unit II: D.C. Machines, Batteries & Measuring Instruments
Multiple Choice Questions (16 to 30)
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16. The EMF equation of a DC generator depends on:
- a) Number of poles
- b) Field flux
- c) Speed of the generator
- d) All of the above
Answer: d) All of the above
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17. In a DC generator, the purpose of a commutator is to:
- a) Convert mechanical energy to electrical energy
- b) Reverse the direction of current flow
- c) Increase the output voltage
- d) Increase the field flux
Answer: b) Reverse the direction of current flow
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18. The armature reaction in a DC motor causes:
- a) Distortion of the magnetic field
- b) Improvement in efficiency
- c) Reduction in losses
- d) No effect on the motor
Answer: a) Distortion of the magnetic field
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19. The back EMF in a DC motor is proportional to:
- a) Speed of the motor
- b) Torque
- c) Armature current
- d) External load
Answer: a) Speed of the motor
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20. The efficiency of a DC generator is defined as the ratio of:
- a) Mechanical power to electrical power
- b) Electrical power to mechanical power
- c) Output power to input power
- d) Input power to output power
Answer: c) Output power to input power
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21. The torque equation of a DC motor is given by:
- a) T = k * I * Φ
- b) T = k * I * V
- c) T = k * I * R
- d) T = k * V * Φ
Answer: a) T = k * I * Φ
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22. The efficiency of a DC motor depends on:
- a) Load current
- b) Speed
- c) Armature resistance
- d) All of the above
Answer: d) All of the above
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23. The starter used for a DC motor is necessary to:
- a) Protect the armature from high current
- b) Increase the voltage
- c) Decrease the efficiency
- d) None of the above
Answer: a) Protect the armature from high current
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24. The speed of a DC motor can be controlled by:
- a) Varying the field flux
- b) Changing the armature resistance
- c) Changing the supply voltage
- d) All of the above
Answer: d) All of the above
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25. A moving coil instrument is used to measure:
- a) AC voltage
- b) DC voltage
- c) Both AC and DC voltage
- d) None of the above
Answer: b) DC voltage
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26. A moving iron instrument can measure:
- a) Only AC
- b) Only DC
- c) Both AC and DC
- d) Only resistance
Answer: c) Both AC and DC
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27. The principle of operation of a dynamometer type wattmeter is based on:
- a) Electromagnetic induction
- b) Mechanical deflection
- c) Magnetic field strength
- d) Electric potential difference
Answer: a) Electromagnetic induction
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28. The induction type energy meter is used to measure:
- a) Energy consumption in AC circuits
- b) Voltage in DC circuits
- c) Current in AC circuits
- d) Power factor in AC circuits
Answer: a) Energy consumption in AC circuits
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29. A strain gauge is used to measure:
- a) Force
- b) Strain
- c) Pressure
- d) Temperature
Answer: b) Strain
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30. The thermistor is used to measure:
- a) Pressure
- b) Temperature
- c) Strain
- d) Light intensity
Answer: b) Temperature
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