Measuring Instruments Objective Type Questions

1. An ammeter is …………… instrument. (i) an indicating (ii) an integrating (iii) a recording (iv) none of the above 2. The controlling torque of an indicating instrument ………. as the deflection of the moving system increases. (i) remains unchanged (ii) decreases (iii) increases (iv) none of the above 3. When the pointer of an …

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Electrostatic Voltmeter Working Principle

Electrostatic voltmeters are based on the fact that an electric force (attraction or repulsion) exists between charged plates or objects. An electrostatic voltmeter is essentially an air condenser ; one plate is fixed while the other, which is coupled to the pointer, is free to rotate on jewelled bearings. Electrostatic Voltmeter Working Principle When p.d. …

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Electrical Engineering Questions and Answers

1. A kilowatt hour is the unit of (i) energy(ii) power(iii) electric charge(iv) electric current 2. Heat produced in a conductor depends (i) inversely on time(ii) directly on time(iii) both (i) and (ii)(iv) none of the above 3. If potential difference across a conductot of a material of resistivity ρ remains constant, then heat produced …

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What are Slip Rings and How do They Tie All Industries Together

Slip rings are often overlooked aspects of machines that have a rotary part to it and need a transmission of electrical signal or power. Without slip rings, rotational devices and machines might not operate as smoothly as they do today, and that’s why slip rings can be seen in so many devices across so many …

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Lightning and Switching Voltage Protection Methods

Most insulations fail during one of the following events: Switching overvoltage due to the inductive and capacitive energy of the system overshooting the system voltage that can be as high as 2 × rated voltage. This is analogous to overpressure due to water hammer when a water pipe is suddenly shut off (switched-off). Lightning overvoltage …

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