Previous year apgenco,apspdcl,apnpdcl,cpdcl,apepdcl

Induction Machines.

1.Speed of the stator field of an induction motor is ?

a. synchoronous speed   b.  any speed   c. less than synchoronous speed  d. slip speed

2.Difference in speed between stator field and rotor field?

a. full load speed  b. no load speed  c.slip  d. regulation

3.Frequency of current in rotor?

a. supply frequency   b.supply frequency d. slip frequency 

4.Shape of the torque slip curve ?

a. Rectangular hyperbola  b. parabola  c. sine  d.cosine

5.Machine with negative slip ?

a.induction motor  b. synchoronous machine  c.induction generator  d. brake

6. When rotor is at standstill ?

a.slip is zero b.slip is one c. any slip d. infinite slip

7.when the motor runs at synchoronous speed slip is ?

a. 1    b.infinite    c.zero       d. two

8.Which torque is greater ?

a.breakdown torque  b. Full load  c. No load  d. Running Torque

9.An induction motor analogous to ?

a. DCmotor b. T/F  c. Sync.Motor  d.DC gen

10.Blocked rotor is analogous to ?

a.OC test  b. SC test  c. swibners d.load test

11.Rotor Copper loss is equal to 

a. Frictional Loss b.Stator Loss  c. Slip times rotor input d. rotational loss

12.For the purpose of Plugging?

a. N is positive w.r.t. Ns    b .N=0     c.N is Negative  w.r.t Ns    d. N is Infinity 

13.Parameter from no load test is ?

 a.Ri and Xi     b.Ro and Xo   c.Copper Loss d. Impedence

14. If Stator field is rotating in clock wise direction rotor rotates in?

a.any direction b. cannot predict c. anti clockwise d. clock wise

15.Blocked rotor test is conducted at ?

a. High voltage b.rated current  c. high current d.rated voltage

16.Speed of Rotor field in space ?

a. N    b.Any speed   c. Ns    d. Slip Speed

17.Line joining tangent and output line in a circle diagram gives?

a.copper loss  b.stator loss   c. maximum output   d. maximum torque

18.Line joining tangent and torque line in a circle diagram gives ?

a.copper loss  b.stator loss   c. maximum output   d. maximum torque

19.No load test is conducted at ?

a. High voltage   b.rated current    c. high current     d.rated voltage

****************************All the Best **********************