1. Main advantage of null balance technique of measurement is ?
A- It does not load the medium.
2. Span of a zero centered voltmeter with scale -10 Volts to + 10 Volts is ?
A- 20 Volts
3. X require 30 mA and Y - 50 mA, to show full scale deflection , then which is more sensitive?
A- X is more sensitive
4. The smallest change in the measured variable to which an instrument responds is known as ?
A- Resolution
5. What is Hysteresis in an Instrument ?
A- Change in the same reading when reading are taken in increasing order and vice versa.
6. What is static error band?
A- It is error caused when pen is stopped at some deflection
7. What is Fidelity ?
A- How closely the instrument reading follows the measured variable.
8. What is Thermal Zero shift?
A- Maximum variation in Pen Zero because of the temperature variation..
9. The pointer indicates most accurately in which part of the scale ?
A- Middle
10. What is reliability in MI?
A- The Characteristics remain linear.
11. Two wires are wound side by side in opposite direction in a resistor to ?
A- Reduce the inductance of coil.
12. Residual Inductance of a standard resistance is reduced by ?
A- By making bifilar winding on a card.
13. Why are the wire wound resistors not suitable for high frequencies?
A- They posses unwanted effects - Inductive and Capacitive.
14. The Condition for a resistor to be non inductive is ?
A- L=CR^2
15. Most common type of capacitor is ?
A- Concentric Cylinder type having a guard ring
16. Accuracy classes of Industrial MI are ?
A- 1, 1.5, 2.5, 5
17. The preferred material for a Permanent magnet is ?
A- Alnico.
