IV SEM 23198 EE-402 ELECTRICAL MACHINES-II

What is the relationship between speed, frequency, slip and poles?

(a)  

At standstill, what is the value of slip of a induction motor?

• 1

• 0

• 0.01

• 5%

What is the following ratio in terms of slip? P2:Pc:Pm=?

• 1:1-s:s

• 1:s:1-s

• s:1:1-s

• s:1-s:1

What is the condition for maximum torque?

(a)  

rotor efficiency in terms of slip?

• s

• 1

• 0

• 1-s

The speed of Induction motor is .....

• equal to synchronous speed

• independent of synchronous speed

• less than synchronous speed

• greater than synchronous speed

Which of the following motors are not self-starting?

• Synchronous motor

• 3-ph Induction motor

• 1-ph induction motor

• DC shunt motor

What is the direction of rotation of a shaded pole motor?

• shaded part to unshaded part of the pole

• unshaded part to shaded part of the pole

• Phase to neutral

• Neutral to phase

Which of the following is most suited for traction purposes?

• DC shunt motor

• DC series motor

• DC compound motor

• None of the above

Load angle is the angle between....

• Back emf and armature current

• Back emf and resultant emf

• resultant emf and applied voltage

• back emf and applied voltage