Electrical Circuit Design
Q1. What component in the power circuit of a DOL starter connects the motor to the power supply?
a. Overload relay
b. Main contactor
c. Start push button
d. Stop push button
Q2. Why is an overload relay used in a DOL starter circuit?
a. To increase motor speed
b. To provide soft start to the motor
c. To protect the motor from overcurrent
d. To reduce voltage fluctuations
Q3. In a DOL starter, what happens when the stop button is pressed?
a. The main contactor is energized
b. The overload relay is bypassed
c. The motor speed increases
d. The main contactor is de-energized
Q4. Which input signal does the PLC process to stop the motor in a DOL starter setup?
a. X0 (Start button)
b. X1 (Stop button)
c. X2 (Overload relay)
d. X3 (Emergency stop)
Q5. What is the main advantage of using a PLC in controlling a DOL starter?
a. Reduced hardware components
b. Increased manual intervention
c. Enhanced programmability and control
d. Lower initial cost
