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WorksheetsRevision Chapter 2
Total questions: 10
Worksheet time: 5mins
A ...... device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
damping
deflecting
controlling
none of the above
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
Low
High
Almost zero
None of the above
A dynamometer wattmeter can be used for
DC
AC
DC and AC
Any of the above
In a portable instrument, the controlling torque is provided by
Spring
Gravity
Eddy Current
Spindle
The disc of an instrument using eddy current damping should be of.........
Conducting and magnetic material
Non-conducting and magnetic material
Conducting and non-magnetic material
None of the above
The gravity controlled instrument has crowded scale because current is proportional to.................
Balancing weight
Deflection angle
cosine of deflection angle
Sine of deflection angle
Which of the following is the merit of a moving iron instrument
It can be used under severe over-load conditions
It has linear scale
It can be used at high frequencies
Its current sensitivity is high
............ damping method is common in moving coil instruments
Air
Fluid
Spring
Eddy Current
Control springs are made up of................
Steel
Gold
Silver
Phosphor bronze
An induction meter can handle current upto
50A
30A
100A
80A
