(a) 4000
(b) 8000
(c) 6000
(d) 10,000
(c) 6000
(d) 10,000
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In a three-stack 12/8-pole VR motor, the rotor pole pitch is
(a) 15º
(b) 30º
(c) 45º
(d) 60º
(b) 30º
(c) 45º
(d) 60º
A variable reluctance stepper motor is constructed of
(a) paramagnetic
(b) ferromagnetic
(c) diamagnetic
(d) non-magnetic
(b) ferromagnetic
(c) diamagnetic
(d) non-magnetic
The function of a snubber circuit connected across an scr is to
A. Suppress dv/dt
B. Increase dv/dt
C. Decrease dv/dt
D. Keep transient voltage at a constant value
A snubber circuit is used in the scr control circuits to overcome the effects of
A. Transients in the dc supply
B. Corona
C. Electromagnetism
D. Heating caused by the high voltage ac supply