Sunday, July 24, 2016

BSNL TTA Practice Question



Q1:- In a single phase induction motor 
  1. both the main and auxiliary windings are placed on the stator 
  2. both the main and auxiliary windings are paced on the rotor
  3. the main winding is on stator and the auxiliary winding is on rotor
  4. none of the above
ANSWER:- 1



Q2:- The rotor windings of a synchro control transformer are 
  1. never connected to the A.C. supply 
  2. connected to the CT taps 
  3. for 3-phase power input only
  4. connected to the A.C. supply 
ANSWER:-1



Q3:- The direction of rotation in a conventional shaded -pole motor can be reversed by 
  1. reversing the line connections 
  2. using a capacitor 
  3. reversing the rotor 
  4. reversing the stator poles 180 degree
ANSWER:-4



Q4:- The effective voltage induced in any synchro transmitter coi depends on the angular position of the 
  1. the differential field flux 
  2. the A.C. magnetic field of the rotor
  3. a D.C. source 
  4. compensation windings
ANSWER:-2



Q5:- If the centrifugal switch of a capacitor start motor fail to open
  1.   the motor will come to stop
  2. the auxiliary winding will be damaged the capacitor will be destroyed.
  3. the capacitor will be destroyed 
  4. none of the above 
ANSWER:-3


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