Learning Outcomes:On successful completion of this module the student will be able toKnowledge and Understanding1. Describe and explain electrical a.c. and d.c. machine construction, control andtheory.Cognitive and Intellectual Skills2. Apply appropriate methods for the solution of well defined calculations inrelation to applications of electrical machines.Practical and Professional Skills3. Interpret British Standards in relation to winding connections and industrialelectrical performance characteristic drawings.Key Transferable Skills4. Demonstrate the ability to apply numerical skills to well defined problems inelectrical machine applications.1. (a) Define the term ‘slip’ as applied to an induction motor.(b) What is the operating speed of a 4-pole squirrel-cage induction motorfed from a 60 Hz supply if the slip is 4%?2. Demonstrate that the relationship between total rotor power, rotor lossesand the mechanical power generated, in terms of rotor current andresistance, by the rotor of an induction motor is of the form 1 : (1 – s) : s.3. (a) State the formula for determining the synchronous speed of aninduction motor.(b) If a 6-pole induction motor is fed from a 50 Hz supply, what is itssynchronous speed?(c) What would be the supply frequency for the 6-pole motor of part (b)running at a speed of 1150 rev min–1 when fully loaded and the slipspeed is 50 rev min–1?4. A four-pole, star-connected, squirrel-cage induction motor operates froma variable voltage 50 Hz three-phase supply. The following results wereobtained as the supply voltage was gradually reduced with the motorrunning on no-load(a) By plotting a suitable graph from these results, determine the total ofwindage and friction losses, the no load magnetising current I0(assume no load current I0 is magnetising losses) and the equivalentcircuit magnetising circuit parameters R0 and X0.3Teesside University Open Learning(Engineering)© Teesside University 2011(b) With locked rotor and 50 volts applied to the stator, the current was23 amperes and power input 985 watts. The resistance between twolines is 0.5 ohms.If the rotor turns per phase equals the stator turns per phase, draw theequivalent circuit of the motor and determine the values of thevarious components. Assume the stator phase reactance is the samevalue as the rotor phase reactance.

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