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[llachica014]

1. A DOL starter is normally used in a / an type of motor ________



2. An induction motor is expected to draw the highest starting current with a starter.

3. Auto transformer starters are often used for motors above kW.

4. The high starting current in a motor normally drops to normal at about______ % of it speed.

5. Autotransformer starters are used with polyphase induction motors to ______.

6. A soft starter can be connected in with the motor,

7. Modem soft start controllers use _________ devices.

8. The main part of a motor starter includes________ .

9. A solenoid works on the________ principle.

10. The Function of a Star-Delta starter of a motor is to ________

 

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1. A DOL (Direct On-Line) starter is normally used in a/an type of motor - single-phase AC motors and three-phase AC motors up to 5 horsepower.

2. Induction motors are known for drawing high starting current, and therefore, they need starters to limit the starting current.

3. Auto transformer starters are often used for motors above 10 kW.

4. The high starting current in a motor normally drops to normal at about 75-85% of its speed.

5. Autotransformer starters are used with polyphase induction motors to reduce the starting current and voltage variations in the power system.

6. Yes, a soft starter can be connected in series with the motor to limit the starting current and reduce the mechanical stresses during starting.

7. Modern soft start controllers use solid-state electronic devices like thyristors, power transistors, or IGBTs (Insulated Gate Bipolar Transistors).

8. The main parts of a motor starter include a contactor, overload relay, control circuit, and power circuit.

9. A solenoid works on the principle of electromagnetic attraction and repulsion, which causes the movement of a plunger or armature.

10. The function of a Star-Delta starter of a motor is to reduce the starting current of a motor and minimize the voltage drop in the power system during starting. It achieves this by initially starting the motor in a Star configuration, which reduces the voltage applied to each winding of the motor. Once the motor is up to speed, it is switched to a Delta configuration for normal operation.