MCQ on Electrical Machine

Which of the following is not a type of Electrical Machine?

• a. DC Motor

• b. AC Generator

• c. Transformer

• d. Battery

What is the basic principle of operation of DC motor?

• a. Faraday's laws of Electro Magnetic Induction

• b. Lenz's Law

• c. Flemmig's Left hand Rule

• d. Flemming's right hand rule

Which of the following is the primary function of a transformer?

• a. To convert mechanical energy to electrical energy

• b. To step up or step down the voltage

• c. To convert AC to DC

• d.To regulate power factor

Which type of motor is commonly used in electric fans?

• a. Synchronous motor

• b. Induction motor

• c. Universal motor

• d. Stepper motor

Which of the following is the function of a starter in a motor?

• a. To increase the voltage applied to the motor
  
  
  

• b. To maintain a constant speed

• c. To limit the inrush current during motor startup

• d. To reduce the power factor of the motor

Which of the following is true for an ideal transformer?

• a) It has zero loss
  
  
  

• b) It has zero leakage flux

• c) Its efficiency is 100%

• d) All of the above

Which of the following motors is used in electric traction?

• a) Synchronous motor
  
  
  

• b) DC series motor

• c) Universal motor

• d) Induction motor

Which of the following motors is self-starting?

• a) Synchronous motor
  
  
  

• b) Shaded pole motor

• c) Universal motor

• d) Stepper motor

Which of the following electrical machines operates without a mechanical commutator?

• a) DC motor
  
  
  

• b) Synchronous motor

• c) Induction motor

• d) Universal motor

Which of the following methods is used to start a squirrel-cage induction motor?

• a) Star-delta method
  
  
  

• b) Direct-on-line method

• c) Autotransformer method

• d) All of the above