Extension of Instrument Ranges MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Extension of Instrument Ranges, a fundamental topic in the field of Electrical Measurement and Instrumentation. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Extension of Instrument Ranges MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Extension of Instrument Ranges mcq questions that explore various aspects of Extension of Instrument Ranges problems. Each MCQ is crafted to challenge your understanding of Extension of Instrument Ranges principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Electrical Measurement and Instrumentation tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Extension of Instrument Ranges MCQs are your pathway to success in mastering this essential Electrical Measurement and Instrumentation topic.

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Extension of Instrument Ranges MCQs | Page 10 of 12

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Q91.
A 1000/5 A, 50 Hz correct transformer has a secondary burden comprising a non-inductance of 2Ω. What is the ratio error, if the iron loss is 3 W and magnetizing mmf is 250 A?

a.

4%

b.

5.7%

c.

3.6%

d.

4.8%

Discuss
Answer: (b).5.7%
Q92.
A 200/1 Current Transformer (CT) is wound with 400 turns on the secondary on a toroidal core. When it carries a current of 180 A on the primary, the ratio is found to be -0.5%. If the number of secondary turns is reduced by 1, the new ratio error (in %) will be?

a.

0.0

b.

-0.5

c.

-1.0

d.

-2.0

Discuss
Answer: (c).-1.0
Q93.
A (350 A/ 7A), 50 Hz current transformer has a primary bar. The secondary burden is a pure resistance of 1 Ω and it draws a current of 5 A. The magnetic core requires 350 AT for magnetization. Find the percentage ratio error.

a.

10.56

b.

-28.57

c.

11.80

d.

-11.80

Discuss
Answer: (b).-28.57
Q94.
The observation when the secondary winding of a current transformer is open-circuited is?

a.

The whole of the primary current produces a large value of flux in the core thereby producing a large voltage in the secondary winding

b.

The large voltage may act as a safety hazard for the operators and many even raptures the insulation

c.

When the large magnetizing force is taken off, it leaves a large value of residual magnetism

d.

When the large magnetizing force is taken off, it leaves a small value of residual magnetism

Discuss
Answer: (b).The large voltage may act as a safety hazard for the operators and many even raptures the insulation
Q95.
Usually a CT has ____________

a.

Power overload capacity than PT

b.

The same overload capacity as a PT

c.

A higher overload capacity than a PT

d.

No overload capacity

Discuss
Answer: (c).A higher overload capacity than a PT
Q96.
A PT is a device which is ___________

a.

Electrostatically coupled

b.

Electrically coupled

c.

Electromagnetically coupled

d.

Conductively coupled

Discuss
Answer: (c).Electromagnetically coupled
Q97.
The CT supplies current to the current coil of a wattmeter power factor meter, energy meter and, an ammeter. These are connected as?

a.

All coils in parallel

b.

All coils in series

c.

Series-parallel connection with two in each arm

d.

Series-parallel connection with one in each arm

Discuss
Answer: (b).All coils in series
Q98.
In a moving iron meter, the deflection torque is proportional to?

a.

Square of the current through the coil

b.

Current through the coil

c.

Sine of measurand

d.

The Square root of the measurand

Discuss
Answer: (a).Square of the current through the coil
Q99.
The full-scale deflection current of an ammeter is 4 mA and its internal resistance is 400Ω. If this meter is to have a full deflection of 10 A, what is the value of the shunt resistance to be used?

a.

49.99 Ω

b.

0.16 Ω

c.

1.5 Ω

d.

2.6 Ω

Discuss
Answer: (b).0.16 Ω
Q100.
The full-scale deflection current of a meter is 4 mA and its internal resistance is 400Ω. This meter is to have full deflection when 400 V is measured. What is the value of the series resistor to be used?

a.

99.90 kΩ

b.

100 kΩ

c.

99.60 kΩ

d.

100 Ω

Discuss
Answer: (c).99.60 kΩ
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