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ELECTRICAL MACHINES

Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 zero or very low voltage supply.
 all of these.
 over load.
 high filed circuit resistance.

ANSWER DOWNLOAD EXAMIANS APP

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

 start automatically without trouble.
 get damaged.
 not start automatically.
 develop very low starting torque.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a DC Motor 3 point starter is used to

 provide overload protection.
 provide protection against Low-Voltage.
 limit the starting current to a safer value.
 all of above.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If starter is not used with large DC motor for starting, it will

 all of above.
 provide execessive voltage drop in line.
 draw a starting current many times its rated full load current.
 damage the armature and commutator.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting torque becomes low.
 the motor may run away.
 the motor may not start.
 the starting current will be enormously high.

ANSWER DOWNLOAD EXAMIANS APP
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