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Q/ A d.c. series motor takes 38 A at 240 V and runs at 940 r.p.m. If the armature and field resistance are 0.21 2 and 0.11 Q respectively and the iron and friction losses are 0.52 kW, find (1) The back e.m.f (2) the torque developed in the armature if the motor speed is halved. (3) The motor efficiency.

Q/ A d.c. series motor takes 38 A at 240 V and runs at 940 r.p.m. If the armature and field resistance are 0.21 2 and 0.11 Q respectively and the iron and friction losses are 0.52 kW, find (1) The back e.m.f (2) the torque developed in the armature if the motor speed is halved. (3) The motor efficiency.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Q/ A d.c. series motor takes 38 A at 240 V and runs at 940 r.p.m. If the armature and field resistance are 0.21 2 and 0.11 2 respectively and the iron and friction losses are 0.52 kW, find (1) The back e.m.f (2) the torque developed in the armature if the motor speed is halved. (3) The motor efficiency.
Transcribed Image Text:Q/ A d.c. series motor takes 38 A at 240 V and runs at 940 r.p.m. If the armature and field resistance are 0.21 2 and 0.11 2 respectively and the iron and friction losses are 0.52 kW, find (1) The back e.m.f (2) the torque developed in the armature if the motor speed is halved. (3) The motor efficiency.
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