Q2. If the motor terminal markings are unknown how would you identify the start, run and common terminal connections. (16)
Q2. Differentiate between squirrel cage and wound rotor motors, of the three phase a.c. induction type, in respect of the following: (16)
(a) Rotor construction
(b) Torque characteristics
(c) Speed variation
Q4. (a) Sketch the following types of electric motor connections: (8)
(i) A star connection
(ii) A delta connection
(b) Explain how and why star and delta connections are combined to produce a Star / Delta starter for an electric motor. (8)
Q2. With reference to a 3 speed a.c. cage motor driven cargo winch:
a) Sketch a circuit diagram for a pole change motor. (8)
b) Describe how speed change and braking are achieved. (8)
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