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A DC generator is connected to 220 V DC mains. The current delivered by the generator to the mains is 100 A. The armature resistance is 0.1 Q. The generator is driven at a speed of 400 rpm. Calculate: a) The induced emf. b) The electromagnetic torque c) The mechanical power input to the armature neglecting iron and rotational losses d) The power input and output of the armature when the speed drops to 350 rpm. State whether the machine is now working in generating or motoring mode. Assume constant flux. e) Calculate machine input and output power for the operational mode specified in part d).

A DC generator is connected to 220 V DC mains. The current delivered by the generator to the mains is 100 A. The armature resistance is 0.1 Q. The generator is driven at a speed of 400 rpm. Calculate: a) The induced emf. b) The electromagnetic torque c) The mechanical power input to the armature neglecting iron and rotational losses d) The power input and output of the armature when the speed drops to 350 rpm. State whether the machine is now working in generating or motoring mode. Assume constant flux. e) Calculate machine input and output power for the operational mode specified in part d).

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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pls solve subparts d and e

A DC generator is connected to 220 V DC mains. The current delivered by the generator to the mains is 100 A. The armature resistance is 0.1 Q. The generator is driven at a speed of 400 rpm. Calculate: a) The induced emf. b) The electromagnetic torque c) The mechanical power input to the armature neglecting iron and rotational losses d) The power input and output of the armature when the speed drops to 350 rpm. State whether the machine is now working in generating or motoring mode. Assume constant flux. e) Calculate machine input and output power for the operational mode specified in part d).
Transcribed Image Text:A DC generator is connected to 220 V DC mains. The current delivered by the generator to the mains is 100 A. The armature resistance is 0.1 Q. The generator is driven at a speed of 400 rpm. Calculate: a) The induced emf. b) The electromagnetic torque c) The mechanical power input to the armature neglecting iron and rotational losses d) The power input and output of the armature when the speed drops to 350 rpm. State whether the machine is now working in generating or motoring mode. Assume constant flux. e) Calculate machine input and output power for the operational mode specified in part d).
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