1.) A: Large synchronous machines are constructed with armature winding on stator. R: Stationary armature winding would have reduced armature reactance.
Each of the following questions consists of two statements, one labelled Assertion (A) and the other labelled the
Reason (R). Examine the two statements carefully and decide if the Assertion (A) and Reason (R) are individually true
and if so whether the Reason (R) is correct explanation of the Assertion (A). Select your answers to these questions using
the codes given below:
A. Both A and R are true and R is a correct explanation of A.
B. Both A and R are true but R is not a correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
1.) A: Large synchronous machines are constructed with armature winding on stator.
R: Stationary armature winding would have reduced armature reactance.
2.) A: Frequency of the system is the same, for synchronously connected machines.
R: Frequency can be controlled by synchronous generators only.
3.) A: For a three-phase alternator operating on leading pf at full load, the terminal voltage may be more than the no-load induced emf.
R: At leading power factor, the effect of armature reaction is demagnetizing.
4.) A: A synchronous motor is not inherently self starting.
R: At standstill the rotor of a synchronous motor is subjected to alternate forces of repulsion and attraction.
5.) A: The squirrel cage induction motor has semi-closed or totally closed type slots on its rotor.
R: There is little difficulty in inserting the rotor bars in semi-closed or totally closed slots and such slots reduce
magnetizing current and teeth loss.
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