Instrumentation Transducers Questions and Answers – Servo Operated Electro Magnetic Flowmeter

This set of Instrumentation Transducers MCQs focuses on “Servo Operated Electro Magnetic Flowmeter”.

1. Which of the following are not suitable with electromagnetic flow meter?
a) Steady flowing liquid
b) Slurries
c) Liquid containing particulate matter
d) None of the mentioned
View Answer

Answer: d
Explanation: Electromagnetic flow meter can be used with all type of liquid.

2. Output signal of electromagnetic flow meter inversely proportional to _________________
a) Magnetic flux density
b) Diameter of tube
c) Velocity of flow
d) None of the mentioned
View Answer

Answer: d
Explanation: E= BDV, where B is the magnetic flux density, D is the diameter of the tube and V is the velocity of flow.

3. Frequency of AC electromagnets are independent of magnetic flux density.
a) True
b) False
View Answer

Answer: b
Explanation: For 50 Hz AC electromagnetic flow meter, magnetic flux density may fluctuate.
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4. Feedback system in electromagnetic flow meter is applied to ______________
a) Overcome fluctuation of B
b) Reduce measuring time
c) Reduce excitation supply
d) None of the mentioned
View Answer

Answer: a
Explanation: Feedback system in electromagnetic flow meter is used to overcome fluctuation of B.

5. Feedback system draws current from the main circuit.
a) True
b) False
View Answer

Answer: b
Explanation: Feedback system connected will not draw any current from the main circuit.

6. Servo operated electromagnetic flow meter is _________________
a) Zero order system
b) First order system
c) Second order system
d) Third order system
View Answer

Answer: c
Explanation: Presence of servomotor in a forward path made a second order system.

7. Electromagnetic flow meter is based on ________________
a) Coulomb’s law
b) Law of electromagnetic induction
c) Kirchhoff law
d) Newton’s law
View Answer

Answer: b
Explanation: Electromagnetic flow meters are based on law of electromagnetic induction.
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8. Which for the following represents condition for maximum emf?
a) Electrodes parallel to pipe length
b) Electrodes parallel to flow
c) Electrodes across flow
d) None of the mentioned
View Answer

Answer: c
Explanation: For maximum emf to be produced electrodes are placed across flow.

9. Which of the following device is used for measuring emf between electrodes?
a) Low impedance type voltmeter
b) High impedance voltmeter
c) No specification for voltmeter
d) None of the mentioned
View Answer

Answer: b
Explanation: If low impedance is used, there will be a drop due to the internal resistance of liquid.
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10. Which of the following factors electromagnetic flow meters are sensitive to?
a) Temperature of fluid
b) Viscosity of fluid
c) Density of fluid
d) None of the mentioned
View Answer

Answer: d
Explanation: Electromagnetic flow meters are insensitive to temperature, viscosity and density of a fluid.

Sanfoundry Global Education & Learning Series – Instrumentation Transducers.

To practice MCQs on all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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