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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.
rheostatic control.
none of above.
Ward Leonard control.
any of above method.
rheostatic control.
none of above.
Ward Leonard control.
any of above method.
Answer
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Related Question
Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in
Armature current.
Supply voltage.
Field excitaion.
Armature voltage.
Armature current.
Supply voltage.
Field excitaion.
Armature voltage.
Answer
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Electrical Machines
In DC machine torque is proportional to which of the following?
flux(φ)
None of these
armature current(Ia)
both A and B
flux(φ)
None of these
armature current(Ia)
both A and B
Answer
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Electrical Machines
Hopkinss test in DC motor is conducted at ?
Full load.
Low load.
None of these.
No load.
Full load.
Low load.
None of these.
No load.
Answer
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Electrical Machines
In DC shunt motor if load is increased, the speed
increase proportional.
increased slightly.
remains constant.
reduce slightly.
increase proportional.
increased slightly.
remains constant.
reduce slightly.
Answer
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Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?
Lv on one core limb and hv on the other
Sandwiched lv and hv discs on each core limb
Half hv inside and half lv outside on each core limb
Half lv inside and half hv outside on each core limb
Lv on one core limb and hv on the other
Sandwiched lv and hv discs on each core limb
Half hv inside and half lv outside on each core limb
Half lv inside and half hv outside on each core limb
Answer
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