Q1. Long-shunt generator delivers a load current of 30 A at 220 V. It has armature and shunt field resistances of 0.050, 2000 respectively: A- calculate the generated emf, the copper loss in armature, shunt field loss and the total copper loss. B-if the iron and friction loss is 1000W. Calculate the electrical efficiency, mechanical efficiency, commertial efficiency and maximum efficiency. (Armature reaction may be neglected) Q2. A 220V, 4-pole, lap-connected, shunt motor with 800 conductors in armature slots. The armature and shunt field resistance are 0.62 and 2200 respectively. The motor runs to supply load with 8000W and draw current (50amps) from the mains. The flux per pole is 25mWb A- Calculate the gross torque developed by the armature, the shaft torque (useful), and the lost torque. B- Calculate the gross power developed by the armature, the iron and friction lost power, mechanical efficiency, electrical efficiency, and the overall efficiency. Armature reaction may be neglected. DC MACHINES/FIRST TEST (14/2/2021)( University of Anbar /Mechanical Eng. Dep. 2nd YEAR 2020/2021)/ time:2h(Dr. Eng. Falah Shallal Khalifa)(ATTEMPT BOTH QUESTIONS).Q1. Long-shunt generator delivers a load current of 30 A at 220 V. it has armatureand shunt field resistances of 0.050, 2000 respectively:A- calculate the generated emf, the copper loss in armature, shunt field loss andthe total copper loss.B- if the iron and friction loss is 1000W. Calculate the electrical efficiency,mechanical efficiency, commertial efficiency and maximum efficiency.( Armaturereaction may be neglected)Q2. A 220V, 4-pole, lap-connected, shunt motor with 800 conductors in armatureslots. The armature and shunt field resistance are 0.602 and 2202 respectively.The motor runs to supply load with 8000W and draw current (50amps) from themains. The flux per pole is 25mWbA- Calculate the gross torque developed by the armature, the shaft torque(useful), and the lost torque.B- Calculate the gross power developed by the armature, the iron and frictionlost power, mechanical efficiency, electrical efficiency, and the overall efficiency.Armature reaction may be neglected.GOOD LUCK

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Q1. Long-shunt generator delivers a load current of 30 A at 220 V. It has armature and shunt field resistances of 0.050, 2000 respectively: A- calculate the generated emf, the copper loss in armature, shunt field loss and the total copper loss. B-if the iron and friction loss is 1000W. Calculate the electrical efficiency, mechanical efficiency, commertial efficiency and maximum efficiency. (Armature reaction may be neglected) Q2. A 220V, 4-pole, lap-connected, shunt motor with 800 conductors in armature slots. The armature and shunt field resistance are 0.62 and 2200 respectively. The motor runs to supply load with 8000W and draw current (50amps) from the mains. The flux per pole is 25mWb A- Calculate the gross torque developed by the armature, the shaft torque (useful), and the lost torque. B- Calculate the gross power developed by the armature, the iron and friction lost power, mechanical efficiency, electrical efficiency, and the overall efficiency. Armature reaction may be neglected.

DC MACHINES/FIRST TEST (14/2/2021)
( University of Anbar /Mechanical Eng. Dep. 2nd YEAR 2020/2021)/ time:2h
(Dr. Eng. Falah Shallal Khalifa)
(ATTEMPT BOTH QUESTIONS).
Q1. Long-shunt generator delivers a load current of 30 A at 220 V. it has armature
and shunt field resistances of 0.050, 2000 respectively:
A- calculate the generated emf, the copper loss in armature, shunt field loss and
the total copper loss.
B- if the iron and friction loss is 1000W. Calculate the electrical efficiency,
mechanical efficiency, commertial efficiency and maximum efficiency.( Armature
reaction may be neglected)
Q2. A 220V, 4-pole, lap-connected, shunt motor with 800 conductors in armature
slots. The armature and shunt field resistance are 0.602 and 2202 respectively.
The motor runs to supply load with 8000W and draw current (50amps) from the
mains. The flux per pole is 25mWb
A- Calculate the gross torque developed by the armature, the shaft torque
(useful), and the lost torque.
B- Calculate the gross power developed by the armature, the iron and friction
lost power, mechanical efficiency, electrical efficiency, and the overall efficiency.
Armature reaction may be neglected.
GOOD LUCK

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