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 12 of 12

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Q111.
A 50 Hz voltage is measured with a moving iron voltmeter and a rectifier type AC voltmeter connected in parallel. If the meter readings are Va and Vb respectively. Then the form factor may be estimated as?

a.

\(\frac{V_a}{V_b}\)

b.

\(\frac{1.11 V_a}{V_b}\)

c.

\(\frac{\sqrt{2} V_a}{V_b}\)

d.

\(\frac{π V_a}{V_b}\)

Discuss
Answer: (b).\(\frac{1.11 V_a}{V_b}\)
Q112.
A moving iron ammeter produces a full-scale torque of 240 μN-m with a deflection of 120° at a current of 10 A. the rate of change of self-inductance (μH/rad) of the instrument at full scale is?

a.

2.0 μH/rad

b.

4.8 μH/rad

c.

12.0 μH/rad

d.

114.6 μH/rad

Discuss
Answer: (b).4.8 μH/rad
Q113.
A moving coil of a meter has 250 turns and a length and depth of 40 mm and 30 mm respectively. It is positioned in a uniform radial flux density of 450 mT. The coil carries a current of 160 mA. The torque on the coil is?

a.

0.0216 N-m

b.

0.0456 N-m

c.

0.1448 N-m

d.

1 N-m

Discuss
Answer: (a).0.0216 N-m
Q114.
Two 100 μA full-scale PMMC meters are employed to construct a 10 V and a 100 V full-scale voltmeter. These meters will have figure of merit (sensitivities) as?

a.

10 kΩ/V and 10 kΩ/V

b.

100 kΩ/V and 10 kΩ/V

c.

10 kΩ/V and 100 kΩ/V

d.

10 kΩ/V and 1 kΩ/V

Discuss
Answer: (a).10 kΩ/V and 10 kΩ/V
Q115.
A PMMC rated as 100 μA is used in a rectifier type of instrument which uses full wave rectification. What is the sensitivity on sinusoidal AC?

a.

4.5 kΩ/V

b.

18 kΩ/V

c.

10 kΩ/V

d.

9 kΩ/V

Discuss
Answer: (d).9 kΩ/V
Q116.
The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The damping ratio is?

a.

0.0568

b.

0.0887

c.

0.0357

d.

0.0441

Discuss
Answer: (c).0.0357
Q117.
The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The logarithmic decrement is?

a.

0.225

b.

0.565

c.

0.484

d.

0.7887

Discuss
Answer: (a).0.225
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