# High Voltage Engineering Questions and Answers – Electrostatic Voltmeter

This set of High Voltage Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Electrostatic Voltmeter”.

1. The uniformity of electric field in an electrostatic voltmeter is maintained by __________
a) electrodes
b) hemisphere structures
c) lower plates
d) guard ring

Explanation: Guard ring maintains the uniformity of electric field in an electrostatic voltmeter. These guard rings are maintained at a constant potential in space. Capacitor divider helps them to maintain constant potential.

2. The __________ the force __________ is the precision that can be obtained with the electrostatic voltmeter.
a) higher, greater
b) higher, lower
c) lower, greater
d) lower, lower

Explanation: The higher the force, greater is the precision that can be obtained with the electrostatic voltmeter. To get a higher force, the area of the plates must be large and the spacing between the plates must be small.

3. Voltmeter using SF6 gas can measure voltage up to __________
a) 500kV
b) 1000kV
c) 2000kV
d) 2500kV

Explanation: Voltmeter using SF6 gas can measure voltage up to 1000kV. Electrostatic meters that uses the compressed gases as the insulating medium can measure higher voltages.

4. Electrostatic voltmeters find it difficult to measure the voltage below __________
a) 10V
b) 20V
c) 50V
d) 100V

Explanation: Electrostatic voltmeters find it difficult to measure the voltage below10V. The force becomes very small that is becomes difficult to measure.

5. In electrostatic voltmeters __________
a) both plates are rigidly fixed
b) both plates are movable
c) both plates are semi movable
d) one plate is fixed and one is movable

Explanation: In electrostatic voltmeters, one plate is fixed and one is movable. Thus it is possible to
create disturbance in the electric field.

6. The electric field is produced by voltage.
a) True
b) False

Explanation: The electric field is produced by voltage. According to Coloumb, electric field is the field of forces.

7. Energy density of electric field between the plates is given by __________
a) W=εE2/2
b) W=εE2/4
c) W=2εE2
d) W=4εE2

Explanation: Energy density of electric field between the plates is given by $$W=\frac{\epsilon E^2}{2}$$ where E is the electric field and ε is the permittivity of the medium between the two plates.

8. The force between the plates is given by __________
a) W=εE2 A/4
b) W=εE2 A/2
c) W=4AεE2
d) W=2AεE2

Explanation: The force between the plates is given by $$W=\frac{\epsilon E^2 A}{2}$$ where E is the electric field, ε is the permittivity of the medium between the two plates and A is the area of the plate.

a) True
b) False

Explanation: Electrostatic voltmeter has low loading effect as only electric field is set up. This serves as a greater advantage of electrostatic voltmeter.

10. Diameter of the plates used in electrostatic voltmeter is __________
a) 1m
b) 2m
c) 3m
d) 4m

Explanation: Diameter of the plates used in electrostatic voltmeter is 1m. At times a pair of spheres of diameter 100cm is used to measure the force between them.

Sanfoundry Global Education & Learning Series – High Voltage Engineering.

To practice all areas of High Voltage Engineering, here is complete set of Multiple Choice Questions and Answers.

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