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ESE EE : Electrical Machines Champion Quiz 4
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Question 1
A salient pole synchronous generator delivering power to an infinite bus through a reactive tie line reaches its steady state stability limit. What is the power angle of the generator relative to the infinite bus voltage reference?
Question 2
Which of the following conditions are to be satisfied for proper synchronization of alternators?
1) Equal terminal voltage
2) Same frequency
3) Same phase sequence
4) Same kVA rating
5) Same phase displacement
Select the correct answer using the code given below:
1) Equal terminal voltage
2) Same frequency
3) Same phase sequence
4) Same kVA rating
5) Same phase displacement
Select the correct answer using the code given below:
Question 3
Assertion (A): For a 3-phase alternator operating on leading p.f. at full load, the terminal voltage may be more than the no-load induced e.m.f.
Reason (R): At leading power factor, the effect of armature reaction is demagnetizing.
Reason (R): At leading power factor, the effect of armature reaction is demagnetizing.
Question 4
When does a synchronous motor operate with leading power factor current?
Question 5
Consider the following statements:
Assertion (A): Large synchronous machines are constructed with armature winding on stator.
Reason (R): Stationary armature winding would have reduced armature reactance.
Of these statements
Assertion (A): Large synchronous machines are constructed with armature winding on stator.
Reason (R): Stationary armature winding would have reduced armature reactance.
Of these statements
Question 6
The equivalent circuit of a transformer has the leakage reactances 
and the magnetizing reactance 
What is the relationship between their magnitudes?
and the magnetizing reactance What is the relationship between their magnitudes? Question 7
What are the conditions to be satisfied for alternator to be synchronized with an incoming supply?
1) Equal voltage
2) Equal frequency
3) Same power rating
4) Same phase sequence
Select the correct answer using the code given below:
1) Equal voltage
2) Equal frequency
3) Same power rating
4) Same phase sequence
Select the correct answer using the code given below:
Question 8
In the measurement of 
(in ohms), following data are obtained by the slip test on a salient pole machine:
max = 10 A 
min = 6.5 A
max = 30 V 
min = 25 V
Which one of the following is correct?
(in ohms), following data are obtained by the slip test on a salient pole machine: max = 10 A min = 6.5 A max = 30 V min = 25 V Which one of the following is correct?
Question 9
A synchronous motor is operated from a bus voltage of 1.0 p.u. and is drawing 1.0 p.u. zero power factor leading current. Its synchronous reactance is 0.5 p.u. What is the excitation emf of the motor?
Question 10
In which one of the following is reluctance power developed?
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Aug 2ESE & GATE EE
