# Q.Which of the following properties damping oil must possess?

• AMust be a good insulator and non-evaporating
• BShould not have corrosive action upon the metal of the vane
• CThe viscosity of the oil should not change with the temperature
• DAll of the above
Correct Answer : (D)

All of the above

Hints :

The properties damping oil must possess are Must be a good insulator and non-evaporating, Should not have corrosive action upon the metal of the vane and the viscosity of the oil should not change with the temperature.

Which of the following are Integrating instruments?

Resistances can be measured with the help of