Which of the following methods are used for producing damping torque in analog instruments?
1. Air friction damping
2. Fluid friction damping
3. Eddy current damping
4. Electromagnetic damping
A. 1, 2 and 3 only
B. 1, 2 and 4 only
C. 1, 3 and 4 only
D. 1, 2, 3 and 4
Answer: Option D
This Question Belongs to Electronics And Communications Engineering >> Measurement And Instrumentation
The spring material used in a spring control device should have the following property.
A. Should be nonmagnetic
B. Most be of low temperature coefficient
C. Should have low specific resistance
D. All of the above
Why is a MISC meter not recommended for DC measurement?
A. The meter is calibrated for AC and it’s error for DC would be high
B. The meter does not respond to DC signals
C. The error is high due to hysteresis effect
D. The error is high due to eddy current effect
A moving iron ammeter may be compensated for frequency errors by
A. A shunt resistance
B. A series inductance
C. Shunt capacitance
D. Series resistance
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