WorksheetsDOL Starters - https://www.youtube.com/watch?v=Shs9lTnZVCU
Total questions: 21
Worksheet time: 11mins
What is the purpose of the overload relay in a direct online starter?
To start the motor
To stop the motor
To protect the motor from overload
To control the speed of the motor
What is the function of the retaining contacts (13 and 14) in a direct online starter?
To start the motor
To hold the motor contacts in place when the start button is pressed
To stop the motor
To reset the motor
What is the typical voltage of the coil in a single phase direct online starter?
110 volts
230 volts
400 volts
12 volts
What is the purpose of the auxiliary circuit in a direct online starter?
To provide power to the motor
To carry a small current for control purposes
To measure the motor's speed
To carry the full load current
What is the typical maximum power rating for a direct online starter used with a grain store motor?
2-3 kilowatts
8-9 kilowatts
6-7 kilowatts
4-5 kilowatts
What happens if the neutral connection is incorrectly wired to the coil in a direct online starter?
The overload relay will trip
The motor will not start
The start button will not work
The motor will run continuously
What is the purpose of the start button in a direct online starter?
To energize the coil and start the motor
To test the motor
To reset the motor
To stop the motor
What is the purpose of the stop button in a direct online starter?
To test the motor
To reset the overload relay
To de-energize the coil and stop the motor
To start the motor
What is the function of the armature in a direct online starter?
To generate a magnetic field
To pull the contacts in place when the coil is energized
To control the voltage
To measure the current
What is the function of the contactor in a direct online starter?
To provide a manual start and stop function
To automatically control the motor's operation
To measure the motor's current
To protect the motor from short circuits
What is the role of the thermal overload relay in a direct online starter?
To start the motor
To stop the motor
To protect the motor from overheating
To control the motor's speed
What is the typical current rating for a direct online starter used with a small industrial motor?
5-10 amps
15-20 amps
25-30 amps
35-40 amps
What is the function of the main contacts in a direct online starter?
To provide a manual start and stop function
To carry the full load current to the motor
To measure the motor's voltage
To protect the motor from overload
What happens if the start button is pressed and held in a direct online starter?
The motor will start and run continuously
The motor will start and then stop
The overload relay will trip
The motor will not start
What is the function of the start capacitor in a single phase direct online starter?
To provide a phase shift for starting torque
To measure the motor's current
To protect the motor from overload
To control the motor's speed
What is the purpose of the interlock in a direct online starter?
To prevent simultaneous operation of start and stop buttons
To measure the motor's voltage
To provide a manual start and stop function
To protect the motor from short circuits
What is the typical frequency of the supply voltage for a direct online starter in most countries?
50 Hz
60 Hz
70 Hz
80 Hz
What is the function of the control circuit in a direct online starter?
To provide power to the motor
To control the operation of the starter
To measure the motor's current
To protect the motor from overload
What is the purpose of the fuse in a direct online starter?
To start the motor
To stop the motor
To protect the motor from short circuits
To control the motor's speed
What happens if the coil in a direct online starter is not energized?
The motor will start
The motor will stop
The motor will run continuously
The motor will not start
What is the function of the start button in a direct online starter?
To energize the coil and start the motor
To test the motor
To reset the motor
To stop the motor
