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Electrical Machines
At slip s = 1 torque developed in machine is
electromagnetic torque.
maximum torque.
none.
starting torque.
electromagnetic torque.
maximum torque.
none.
starting torque.
Answer
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Related Question
Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging
shunt field connections.
armature connections.
series field connections.
armature or field connections.
shunt field connections.
armature connections.
series field connections.
armature or field connections.
Answer
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Electrical Machines
A 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 efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.
82.5%
78.5%
67.5%
72.5%
82.5%
78.5%
67.5%
72.5%
Answer
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Electrical Machines
Tappings of a transformer are provided
at the phase end of hv side
at the middle of hv side
at the phase end of lv side
at the neutral side end of hv side
at the phase end of hv side
at the middle of hv side
at the phase end of lv side
at the neutral side end of hv side
Answer
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Electrical Machines
Which of the following bearings and their uses are correct
neither 1 nor 2
ball bearings → small machines
both A and B
roller bearings → large machines
neither 1 nor 2
ball bearings → small machines
both A and B
roller bearings → large machines
Answer
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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?
1.5KW
2KW
0.5Kw
3KW
1.5KW
2KW
0.5Kw
3KW
Answer
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