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This question assesses your understanding of the devices and application part of the module. Note: When entering your numerical answers, please pay attention to the precesion restirections (if any) as this will cost you lasing the mark if not met. a) A 80 KVA single-phase 1100V/140V, 50 Hz transformer has a maximum core flux density of 1.2T and an effective cross-sectional area of 65cm?. Calculate the number of turns on the primary and secondary windings and the rated current of the seconday winding. i) the number of turns on the primary, N Round your answer to the nearest integer. turos. ii) the number of turns on the secondary, N2 Round your answer to the nearest integer.turns. ii) the rated secondary current, I2 Round your answer to the nearest integerA b) A 235V, 10hp separately excited dc motor delivers power to a load at 1300 rpm. The armature current drawn by the motor is 208A and the armature resistance of the motor is 0.25Q. If the rotational losses are 480W, what is the value of the load torque? The Load torque is Round your answer to the nearest integer. N.m. c) A 400V separately excited DC motor runs at its normal speed of 635 rpm when the armature current is 70 A. The armature resistance is 0.30. Determine the speed when the armature current is 40A and the field is reduced to 75% of its normal value by increasing the resistance of the field circuit. The new speed is Round your answer to the nearest integer. r.p.m.

This question assesses your understanding of the devices and application part of the module. Note: When entering your numerical answers, please pay attention to the precesion restirections (if any) as this will cost you lasing the mark if not met. a) A 80 KVA single-phase 1100V/140V, 50 Hz transformer has a maximum core flux density of 1.2T and an effective cross-sectional area of 65cm?. Calculate the number of turns on the primary and secondary windings and the rated current of the seconday winding. i) the number of turns on the primary, N Round your answer to the nearest integer. turos. ii) the number of turns on the secondary, N2 Round your answer to the nearest integer.turns. ii) the rated secondary current, I2 Round your answer to the nearest integerA b) A 235V, 10hp separately excited dc motor delivers power to a load at 1300 rpm. The armature current drawn by the motor is 208A and the armature resistance of the motor is 0.25Q. If the rotational losses are 480W, what is the value of the load torque? The Load torque is Round your answer to the nearest integer. N.m. c) A 400V separately excited DC motor runs at its normal speed of 635 rpm when the armature current is 70 A. The armature resistance is 0.30. Determine the speed when the armature current is 40A and the field is reduced to 75% of its normal value by increasing the resistance of the field circuit. The new speed is Round your answer to the nearest integer. r.p.m.

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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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This question assesses your understanding of the devices and application part of the module. Note: When entering your numerical answers, please pay attention to the precesion restirections (if any) as this will cost you lasing the mark if not met. a) A 80 KVA single-phase 1100V/140V, 50 Hz transformer has a maximum core flux density of 1.2T and an effective cross-sectional area of 65cm?. Calculate the number of turns on the primary and secondary windings and the rated current of the seconday winding. i) the number of turns on the primary, N Round your answer to the nearest integer. turos. ii) the number of turns on the secondary, N2 Round your answer to the nearest integer.turns. ii) the rated secondary current, I2 Round your answer to the nearest integerA
Transcribed Image Text:This question assesses your understanding of the devices and application part of the module. Note: When entering your numerical answers, please pay attention to the precesion restirections (if any) as this will cost you lasing the mark if not met. a) A 80 KVA single-phase 1100V/140V, 50 Hz transformer has a maximum core flux density of 1.2T and an effective cross-sectional area of 65cm?. Calculate the number of turns on the primary and secondary windings and the rated current of the seconday winding. i) the number of turns on the primary, N Round your answer to the nearest integer. turos. ii) the number of turns on the secondary, N2 Round your answer to the nearest integer.turns. ii) the rated secondary current, I2 Round your answer to the nearest integerA
b) A 235V, 10hp separately excited dc motor delivers power to a load at 1300 rpm. The armature current drawn by the motor is 208A and the armature resistance of the motor is 0.25Q. If the rotational losses are 480W, what is the value of the load torque? The Load torque is Round your answer to the nearest integer. N.m. c) A 400V separately excited DC motor runs at its normal speed of 635 rpm when the armature current is 70 A. The armature resistance is 0.30. Determine the speed when the armature current is 40A and the field is reduced to 75% of its normal value by increasing the resistance of the field circuit. The new speed is Round your answer to the nearest integer. r.p.m.
Transcribed Image Text:b) A 235V, 10hp separately excited dc motor delivers power to a load at 1300 rpm. The armature current drawn by the motor is 208A and the armature resistance of the motor is 0.25Q. If the rotational losses are 480W, what is the value of the load torque? The Load torque is Round your answer to the nearest integer. N.m. c) A 400V separately excited DC motor runs at its normal speed of 635 rpm when the armature current is 70 A. The armature resistance is 0.30. Determine the speed when the armature current is 40A and the field is reduced to 75% of its normal value by increasing the resistance of the field circuit. The new speed is Round your answer to the nearest integer. r.p.m.
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