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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will
develop very low starting torque.
not start automatically.
start automatically without trouble.
get damaged.
develop very low starting torque.
not start automatically.
start automatically without trouble.
get damaged.
Answer
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Related Question
Electrical Machines
The speed of a 3-phase induction motor operating in its stable region
increases with increase in the load torque.
remains constant.
decreases with decrease in the load torque.
decreases with increase in the load torque.
increases with increase in the load torque.
remains constant.
decreases with decrease in the load torque.
decreases with increase in the load torque.
Answer
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Electrical Machines
The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are
1, 2, 3, 4 and 5
2, 3, 4, 5
2, 3, 4
1, 3, 4, 5
1, 2, 3, 4 and 5
2, 3, 4, 5
2, 3, 4
1, 3, 4, 5
Answer
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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is
K×R1
K²R1
R1 /K²
R1 /K
K×R1
K²R1
R1 /K²
R1 /K
Answer
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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.
None of above.
Any of above method.
Rheostatic control.
Ward Leonard control.
None of above.
Any of above method.
Rheostatic control.
Ward Leonard control.
Answer
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Electrical Machines
Induction motors have the advantage of
all of below.
less cost.
less maintenance.
simple in construction.
all of below.
less cost.
less maintenance.
simple in construction.
Answer
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