A 6-pole armature of a d.c. machine has 776 conductors and a flux per pole of 35 mWb. Determine the e.m.f. generated when running at 681 rev/min when the armature is lap-wound. O a. 308.27 V O b. 924.80 V O c. 616532.00 V O d. 6165.32 V

A 6-pole armature of a d.c. machine has 776 conductors and a flux per pole of 35 mWb. Determine the e.m.f. generated when running at 681 rev/min when the armature is lap-wound. O a. 308.27 V O b. 924.80 V O c. 616532.00 V O d. 6165.32 V

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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Concept explainers

Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors. The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.

Question

q. 21

A 6-pole armature of a d.c. machine has 776 conductors and a flux per pole of 35 mWb.
Determine the e.m.f. generated when running at 681 rev/min when the armature is lap-wound.
O a. 308.27 V
O b. 924.80 V
O C. 616532.00 V
O d. 6165.32 V

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