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Electrical Machines
A DC series motor has which of the following characteristics?
Has a almost constant speed.
Has its field winding consinting of thick wire and less no of turns.
Has a poor torque.
Can be started easily without load.
Has a almost constant speed.
Has its field winding consinting of thick wire and less no of turns.
Has a poor torque.
Can be started easily without load.
Answer
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Related Question
Electrical Machines
The polarity of a DC generator can be reversed by
any of above.
reversing the field current.
reversing field electric current as well as direction of rotation.
increasing field current.
any of above.
reversing the field current.
reversing field electric current as well as direction of rotation.
increasing field current.
Answer
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Electrical Machines
If a DC Series motor is connected across an AC supply it will
not run.
run at normal speed.
run at lower speed.
burn.
not run.
run at normal speed.
run at lower speed.
burn.
Answer
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Electrical Machines
In case of DC shunt motor if load is reduced
DC Shunt Motor
The speed will increase in proportion to reduction in load.
The speed will increase abruptly.
The speed will remains almost constant.
DC Shunt Motor
The speed will increase in proportion to reduction in load.
The speed will increase abruptly.
The speed will remains almost constant.
Answer
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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is
θelec = 4/P*θmech
θelec = θmech
θelec = 2/P*θmech
θelec = P/2*θmech
θelec = 4/P*θmech
θelec = θmech
θelec = 2/P*θmech
θelec = P/2*θmech
Answer
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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as
3 to 5.
2 to 3.
1.0.
1.5 to 2.
3 to 5.
2 to 3.
1.0.
1.5 to 2.
Answer
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