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ESE 2021 Technical Quiz || Synchronous machines 1

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Question 1

A salient pole synchronous generator has the following per unit parameters Xd = 0.8, Xq = 0.6 and Ra = 0.1 . If the generator is delivering rated kVA at rated voltage at pf 0.8(lead). The load angle will be

Question 2

Which of the following quantities are considered which measuring synchronous reactance?

i. Armature reaction

ii. Leakage reactive

iii. Power factors

iv. Core saturation

Question 3

Each of the next four (4) items consists of two statements, one labelled as ‘Statement (I)’ and the other as ‘Statement (II)’. You are to examine these two statements carefully and select the answers to these items using the code given below:

A. Both Statements (I) and Statement (II) are individually true and Statement (II) is correct explanation of statement (I).

B. Both Statements (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of statement (I).

C. Statement (I) is true but statement (II) is false.

D. Statement (I) is false but statement (II) is true.

Statement 1: Damping windings are used for starting a synchronous motor.

Statement 2: Damping windings are heavy copper bar inserted in slots of pole faces which are short circuited at both ends of the rotor thus acting as squirrel cage winding.

Question 4

A 60 kW, 415 V, 3-phase synchronous motor is delivering rated load with 85% efficiency if the power factor is 0.8 loading, the armature current is

Question 5

The phenomenon of rotor about load is termed as:
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Jun 7ESE & GATE EE

Posted by:

Shivang AgrawalShivang AgrawalMember since Jan 2020
M.tech(NIT Nagpur) GATE Ranker[2015-18]
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