Q1. A. Sketch a circuit diagram of a push button direct online contactor starter for a three phase Incorporating overload and short circuit protection.
B. Indicate, on a sketch of the typical characteristic curves of current and torque against Speed, disadvantages of a direct on line start squirrel cage induction motor.
Q1. (a) With reference to single phasing applied to A.C. motors: (8)
(i) Explain the meaning of single phasing
(ii) Describe its effect
(iii) State the most common cause of single phasing.
(b) Sketch a simple diagram of a direct online starter, showing in detail the overload and single-phase protection trip. (8)
Q2. 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)
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