Electrical Circuit Design
Q1. What is the primary function of a Direct-On-Line (DOL) starter?
a. To increase the speed of the motor
b. To provide a soft start to the motor
c. To directly connect the motor to the power supply
d. To reduce the voltage applied to the motor
Q2. What problem does a DOL starter help to mitigate when starting a 3-phase induction motor?
a. Low starting torque
b. High inrush current
c. Excessive noise
d. Mechanical wear
Q3. Which component in a DOL starter protects the motor from overcurrent conditions?
a. Main contactor
b. Overload relay
c. Start push button
d. Stop push button
Q4. What is the role of the PLC in a DOL starter circuit?
a. To increase motor speed
b. To manually control the contactor
c. To process input signals and control the contactor
d. To provide power to the motor
Q5. Which of the following is a common application of a DOL starter?
a. Light dimmers
b. HVAC systems
c. Mobile phones
d. Battery chargers
