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Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements


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10 Questions MCQ Test GATE Electrical Engineering (EE) 2023 Mock Test Series | Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements for Electrical Engineering (EE) 2022 is part of GATE Electrical Engineering (EE) 2023 Mock Test Series preparation. The Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements MCQs are made for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements below.
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Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 1

A moving coil instrument has the following data:
Number of turns = 100
Width of the coil = 20 mm
Depth of the coil = 30 mm
Flux density in the gap = 0.1 Wb/m2
If the control spring constant is 2 x 10-6 N-m/ degree, then the deflection of the pointer when the coil carries a current of 10 mA is

Detailed Solution for Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 1

The deflecting torque,

At equilibrium,
Tc = Td

Thus, the deflection of the pointer  = π/6 radian.

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 2

A PMMC uses a :

Detailed Solution for Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 2

A PMMC uses a moving coil and the magnet is permanent.

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 3

A moving iron movement uses

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 4

A 1 mA meter movement with an internal resistance of 100 Ω is to be converted into a 0-100 mA. The value of shunt resistant required is

Detailed Solution for Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 4

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 5

Which of the following is not a desired characteristic of shunts used in PMMC instruments?

Detailed Solution for Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 5

Shunts used in PMMC instruments are made up of manganin or constantan since they have very low temperature coefficient of resistance.

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 6

To select the range, a multirange ammeter uses a

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 7

A D’Arsonval movement is

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 8

What is the value of multiplier resistance on the 50 V range of a dc voltmeter that uses a 500 μA meter movement with an internal resistance of 1 kΩ?

Detailed Solution for Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 8

The sensitivity of 500 μA meter movement is given by,

The value of the multiplier resistance can be obtained as

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 9

Loading effect in a voltmeter can be avoided by

Detailed Solution for Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 9

Higher the sensitivity of the voltmeter, lower the loading effect and vice-versa.

Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 10

Assertion (A): Gravity control is not suited for indicating instruments in general and portable instruments in particular.
Reason (R): Gravity control is used in only vertically mounted instruments.

Detailed Solution for Test: Electromechanical Indicating Instruments to Electrical & Electronics Measurements - Question 10

Gravity control is not suited for indicating instruments in general and portable instruments in particular because for using this type of control, the instruments must be mounted in level position otherwise there will be a very serious zero error. Gravity control is used in only vertically mounted instruments. Hence, reason is also a true statement but, not a correct explanation of assertion.

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