# Question 21 May 2021 Assume a four pole, lap wound, short shunt compound (cumulative) d.c, generator with an armature resistance of 0.020, field resistance of 0.040 and a shunt resistance of 100. The armature has 120 conductors in the slots and runs at 1000rpm. The generator supplies three loads connected as follows: i. a 72kW motor and a 2.4kW geyser connected in 21 May 2021 Assume a four pole, lap wound, short shunt compound (cumulative) d.c, generator with an armature resistance of 0.020, field resistance of 0.040 and a shunt resistance of 100. The armature has 120 conductors in the slots and runs at 1000rpm. The generator supplies three loads connected as follows: i. a 72kW motor and a 2.4kW geyser connected in parallel and a ii. a 1.8kW lighting load in series with the parallel combination in (1) above iii. the motor draws a current of 30A Neglect friction, rotational losses and assume a brush drop of 1.8V then: a. calculate the armature induced voltage [10 marks] b. calculate the flux per pole [05 marks) [05 marks] c. calculate the efficiency of the machine d. calculate the voltage across the lighting load [05 marks]

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Transcribed Image Text: 21 May 2021 Assume a four pole, lap wound, short shunt compound (cumulative) d.c, generator with an armature resistance of 0.020, field resistance of 0.040 and a shunt resistance of 100. The armature has 120 conductors in the slots and runs at 1000rpm. The generator supplies three loads connected as follows: i. a 72kW motor and a 2.4kW geyser connected in parallel and a ii. a 1.8kW lighting load in series with the parallel combination in (1) above iii. the motor draws a current of 30A Neglect friction, rotational losses and assume a brush drop of 1.8V then: a. calculate the armature induced voltage [10 marks] b. calculate the flux per pole [05 marks) [05 marks] c. calculate the efficiency of the machine d. calculate the voltage across the lighting load [05 marks]
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Transcribed Image Text: 21 May 2021 Assume a four pole, lap wound, short shunt compound (cumulative) d.c, generator with an armature resistance of 0.020, field resistance of 0.040 and a shunt resistance of 100. The armature has 120 conductors in the slots and runs at 1000rpm. The generator supplies three loads connected as follows: i. a 72kW motor and a 2.4kW geyser connected in parallel and a ii. a 1.8kW lighting load in series with the parallel combination in (1) above iii. the motor draws a current of 30A Neglect friction, rotational losses and assume a brush drop of 1.8V then: a. calculate the armature induced voltage [10 marks] b. calculate the flux per pole [05 marks) [05 marks] c. calculate the efficiency of the machine d. calculate the voltage across the lighting load [05 marks]