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Test: Open Circuit and Short Circuit Test - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Electrical Machines for Electrical Engg. - Test: Open Circuit and Short Circuit Test

Test: Open Circuit and Short Circuit Test for Electrical Engineering (EE) 2024 is part of Electrical Machines for Electrical Engg. preparation. The Test: Open Circuit and Short Circuit Test questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Open Circuit and Short Circuit Test MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Open Circuit and Short Circuit Test below.
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Test: Open Circuit and Short Circuit Test - Question 1

Which of the following informations are not obtained from short-circuit test?

I. Ohmic losses at rated current
II. Equivalent resistance and leakage reactance
III. Core losses
IV. Voltage regulation

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 1

Core losses are found from OC test and the voltage regulation is not obtained from one single test here.

Test: Open Circuit and Short Circuit Test - Question 2

Which of the following conditions have to ensured for a open-circuit test?

A. Performed on L.V side
B. Leakage impedance can be obtained
C. It is performed at rated voltage
D. It gives magnetizing impedance

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 2

Leakage impedance is not found from open-circuit test.

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Test: Open Circuit and Short Circuit Test - Question 3

Which of the following conditions have to ensured for a short-circuit test?

A. h.v. winding is short-circuited
B. It helps in calculation of voltage regulation
C. It is performed at rated voltage
D. l.v. winding is short-circuited

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 3

For conducting short circuit test, l.v. winding is short circuited and it is not performed at rated voltage.

Test: Open Circuit and Short Circuit Test - Question 4

A single phase transformer of 2200/220 V having rated l.v. current of 150 A has to undergo open circuit test on h.v side. The instruments used are voltmeter of 200V and ammeter of 1A. Then the results ___________

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 4

The current in the h.v. winding will be around 10 A but the ammeter is of 1 A rating. So, it will burn off.

Test: Open Circuit and Short Circuit Test - Question 5

A single phase transformer of 2200/220 V having rated l.v. current of 150 A has to undergo open circuit test on h.v. side. Which of the below instruments range should be used?

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 5

Open circuit test is conducted on l.v. side, so the measuring instruments will be on the h.v. side.
So the current in the h.v. side will be around 3-6% of the rated.

Test: Open Circuit and Short Circuit Test - Question 6

To conduct the open circuit test, test is conducted on the _____________

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 6

OC test is performed on the l.v. side of the transformer because the l.v. winding will have lower stress on the insulation and no damage will occur.

Test: Open Circuit and Short Circuit Test - Question 7

Which of the following informations are obtained from short-circuit test?

I. Ohmic losses at rated current
II. Equivalent resistance and leakage reactance
III. Core losses
IV. Voltage regulation

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 7

Core losses are found from OC test.

Test: Open Circuit and Short Circuit Test - Question 8

The open circuit test results in finding which of the following parameters?

I. core losses
II. shunt branch parameters
III. turns ratio of transformer

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 8

OC test gives the shunt branch parameters as well as the turns ratio by connecting a voltmeter at open circuited secondary terminals.

Test: Open Circuit and Short Circuit Test - Question 9

Which of the following conditions have to ensured for a open-circuit test?

A. Performed on L.V side
B. Leakage impedance can be obtained
C. It is performed at 10-12% of rated voltage
D. It gives magnetizing impedance

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 9

Leakage impedance is not found from open-circuit test. And it is performed on the rated voltage to account for core losses.

Test: Open Circuit and Short Circuit Test - Question 10

Transformers with high leakage impedance is used in ___________

Detailed Solution for Test: Open Circuit and Short Circuit Test - Question 10

The feature of the high impedance is extracted in the arc welding applications.

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