Electrical Measurement MCQs Part 7

Electrical Engineering MCQ on Electrical Measurements

The two pressure coils of a single phase power factor meter have

The two pressure coils of a single phase power factor meter have

1. Same dimension but different number of turns
2. Same dimensions and the same number of turns
3. Same number of turns but different dimensions
4. None of these

Correct answer: 2. Same dimensions and the same number of turns

Inorder to measure the flux, devices used are based on

Inorder to measure the flux, devices used are based on

1. Hall effect
2. Photo-voltaic effect
3. Piezo-electric effect
4. Voltaic effect

Correct answer: 1. Hall effect

No eddy current and hysteresis losses occur in which of following instrument

No eddy current and hysteresis losses occur in which of following instrument

1. Electrodynamo meter instruments
2. Electrostatic instruments
3. Moving iron instruments
4. PMMC instruments

Correct answer: 2. Electrostatic instruments

The absolute measurement of resistance is done using which method

The absolute measurement of resistance is done using which method

1. Bridge Method
2. Lorenz method
3. Ohm’s law method
4. Rayleigh method

Correct answer: 2. Lorenz method

For power measurement of three phase circuit using two wattmeter method, when power factor is less than 0.5 lagging

For power measurement of three phase circuit using two wattmeter method, when power factor is less than 0.5 lagging

1. Both will have the same readings
2. One of the wattmeter connections will have to be reversed
3. One of the wattmeters will read zero
4. Pressure coil of the wattmeter will become ineffective.

Correct answer: 2. One of the wattmeter connections will have to be reversed