ETO ETO Exam papers 📅 Jul 2025

Exam Question

(a) Sketch a circuit diagram of a push button direct online contactor starter for a three phase Incorporating overload and short circuit protection. (8)

(b) Indicate, on a sketch of the typical characteristic curves of current and torque against Speed, disadvantages of a direct online start squirrel cage induction motor. (8)

Reference Answer

(a) In the D.O.L starter circuit:
The main supply is connected to the contactor, which, when energized, connects the A.C motor to the supply.
The START push button activates the contactor, allowing the motor to start running.
Overload protection (O/L Relay) and Single Phase Protection Relay are connected in series with the contactor in the control circuit.

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