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Electrical Machines
In which transformer, the tertiary winding is used?
Star - delta
Star - star
Delta - delta
Delta - star
Star - delta
Star - star
Delta - delta
Delta - star
Answer
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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will
worsen and terminal voltage will fall
improve but terminal voltage will fall.
worsen and terminal voltage will rise.
improve and terminal voltage will rise .
worsen and terminal voltage will fall
improve but terminal voltage will fall.
worsen and terminal voltage will rise.
improve and terminal voltage will rise .
Answer
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Electrical Machines
Slot wedges in a dc machine is made up of
cast iron.
silicon steel.
fibre.
mild steel.
cast iron.
silicon steel.
fibre.
mild steel.
Answer
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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.
940 RPM
960 RPM
970 RPM
920 RPM
940 RPM
960 RPM
970 RPM
920 RPM
Answer
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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase
rotor resistance
supply voltage
None of these
supply frequency
rotor resistance
supply voltage
None of these
supply frequency
Answer
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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be
36.
80.
50.
18.
36.
80.
50.
18.
Answer
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