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Test: Instrument Transformer - 1 - Electrical Engineering (EE) MCQ


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15 Questions MCQ Test GATE Electrical Engineering (EE) 2024 Mock Test Series - Test: Instrument Transformer - 1

Test: Instrument Transformer - 1 for Electrical Engineering (EE) 2024 is part of GATE Electrical Engineering (EE) 2024 Mock Test Series preparation. The Test: Instrument Transformer - 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Instrument Transformer - 1 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Instrument Transformer - 1 below.
Solutions of Test: Instrument Transformer - 1 questions in English are available as part of our GATE Electrical Engineering (EE) 2024 Mock Test Series for Electrical Engineering (EE) & Test: Instrument Transformer - 1 solutions in Hindi for GATE Electrical Engineering (EE) 2024 Mock Test Series course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Instrument Transformer - 1 | 15 questions in 45 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study GATE Electrical Engineering (EE) 2024 Mock Test Series for Electrical Engineering (EE) Exam | Download free PDF with solutions
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Test: Instrument Transformer - 1 - Question 1

What is the potential transformer?

Detailed Solution for Test: Instrument Transformer - 1 - Question 1

A transformer used to extend the range of an A.C. voltmeter is known as a potential transformer. A potential transformer is also abbreviated as P.T.

Test: Instrument Transformer - 1 - Question 2

The primary winding of a C.T. has _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 2

The primary winding of a C.T. has a very few number of turns. It is connected in series with the load circuit through which the primary current flows.

Test: Instrument Transformer - 1 - Question 3

Turns ration for a C.T. is _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 3

The turns ratio for a C.T. is defined as the ratio of the number of turns in the secondary to the number of turns in the primary. It is given by the relation

Test: Instrument Transformer - 1 - Question 4

The secondary winding of a P.T. has _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 4

Secondary winding of a P.T. has a few number of turns. A low range voltmeter is connected in parallel with the secondary winding.

Test: Instrument Transformer - 1 - Question 5

Instrument transformers provide _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 5

In an instrument transformer, the low rated secondary windings provide electrical isolation from the high rated primary windings.

Test: Instrument Transformer - 1 - Question 6

C.T. and P.T. are standardized at _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 6

Current transformers are standardized at 5 A of secondary winding current, whereas Potential transformers are standardized at 110 V of secondary winding voltage.

Test: Instrument Transformer - 1 - Question 7

A 110V voltmeter can measure a voltage of upto 110kV using a _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 7

An 110000/110V potential transformer can be used for measuring a voltage of upto 110000V by making use of a voltmeter with 110V voltage reading.

Test: Instrument Transformer - 1 - Question 8

How are instrument transformers different from shunts and multipliers?

Detailed Solution for Test: Instrument Transformer - 1 - Question 8

Instrument transformers can be used for extending the range of the A.C. instruments. In instrument transformers, readings are independent of the values of R, L, and C. But in the case of shunts and multipliers, the readings depend on the values of circuit constants.

Test: Instrument Transformer - 1 - Question 9

What is the current transformer?

Detailed Solution for Test: Instrument Transformer - 1 - Question 9

A transformer used to extend the range of an A.C. ammeter is known as a current transformer. A current transformer is also abbreviated as C.T.

Test: Instrument Transformer - 1 - Question 10

C.T. and P.T. are used for _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 10

C.T. is basically used for the measurement of high currents. A P.T. is usually used for the measurement of high voltages. They are used with A.C. ammeters and voltmeters in order to extend their range.

Test: Instrument Transformer - 1 - Question 11

The secondary winding of a C.T. has _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 11

Secondary winding of a C.T. has a large number of turns. It is connected in series to an ammeter through which a small portion of the current flows through.

Test: Instrument Transformer - 1 - Question 12

The primary winding of a P.T. has _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 12

The primary winding of a P.T. has a very large number of turns. It is connected in parallel with the load whose voltage is to be measured.

Test: Instrument Transformer - 1 - Question 13

A 5A ammeter can measure a current of upto 1000 A using a _________

Detailed Solution for Test: Instrument Transformer - 1 - Question 13

A 1000/5A current transformer can be used for measuring a current of upto 1000A by making use of an ammeter with 5A current reading.

Test: Instrument Transformer - 1 - Question 14

How can the meter circuit be isolated from the power circuit?

Detailed Solution for Test: Instrument Transformer - 1 - Question 14

Leads of the secondary winding transformer are brought to the switch board thus separating them from high voltage windings. In this way, the meter circuit is isolated from the high voltage power circuit.

*Answer can only contain numeric values
Test: Instrument Transformer - 1 - Question 15

The total impedance of the secondary winding, leads, and burden of a 5 A CT is 0.01 Ω. If the fault current is 20 times the rated primary current of the CT, the VA output of the CT is ________.


Detailed Solution for Test: Instrument Transformer - 1 - Question 15

Given that, impedance of secondary winding = 0.01 Ω
Rated current = 5 A
fault current = 20 times of rated current = 20 x 5 = 100 A
VA output = I2z = 1002 x 0.01 = 100 VA

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