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Electrical Machines
Lap winding is prefered for which type of machines?
low current and low voltage
low current and high voltage
high current and high voltage
high current and low voltage
low current and low voltage
low current and high voltage
high current and high voltage
high current and low voltage
Answer
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Related Question
Electrical Machines
In a step down transformer which one of the following statements is true?
Number of secondary turns is more than that of primary.
Secondary power is less than primary power.
Secondary current is less than primary current.
Number of secondary turns is less than primary turns.
Number of secondary turns is more than that of primary.
Secondary power is less than primary power.
Secondary current is less than primary current.
Number of secondary turns is less than primary turns.
Answer
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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be
zero
more than 6 V
6 V
less than 6 V
zero
more than 6 V
6 V
less than 6 V
Answer
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Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will
start working as induction motor.
come to stand still.
continue to work as alternator but the direction of rotation will reverse.
continue to work as synchronous motor with same direction of rotation.
start working as induction motor.
come to stand still.
continue to work as alternator but the direction of rotation will reverse.
continue to work as synchronous motor with same direction of rotation.
Answer
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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then
lap-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
wave-wound machine will have more rated voltage and less current
wave-wound machine will have more rated current and more voltage
lap-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
wave-wound machine will have more rated voltage and less current
wave-wound machine will have more rated current and more voltage
Answer
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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?
60°
45°
10°
30°
60°
45°
10°
30°
Answer
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