Which of the following methods may be adopted to reduce the effects of armature reaction?
A). Increase in length of air gap at pole tips
B). Increasing reluctance of pole tips
C). Compensating windings
D). All of the above
When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
A). short pitch
B). full pitch
C). either of the above
D). none of the above
A potentiometer may be used for
A). measurement of resistance
B). measurement of current
C). calibration of ammeter
D). calibration of voltmeter
E). all of the above
Basically a potentiometer is a device for
A). comparing two voltages
B). measuring a current
C). comparing two currents
D). measuring a voltage
E). none of the above
An induction wattmeter can be used for
A). both D.C. and A.C.
B). D.C. only
C). A.C. only
D). any of the above