A d.c. shunt motor runs at 500 r.p.m. on a 200 V supply. Its armature resistance is 0.5 Q and the current taken is 30 Amp in addition to field current. What resistance must be placed in series with armature to reduce the speed to 300 rpm ? The current in armature remains the same.

A d.c. shunt motor runs at 500 r.p.m. on a 200 V supply. Its armature resistance is 0.5 Q and the current taken is 30 Amp in addition to field current. What resistance must be placed in series with armature to reduce the speed to 300 rpm ? The current in armature remains the same.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 13RQ: A squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is...

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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.

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A d.c. shunt motor runs at 500 r.p.m. on a 200 V supply. Its armature resistance is 0.5 02 and
the current taken is 30 Amp in addition to field current. What resistance must be placed in
series with armature to reduce the speed to 300 rpm ? The current in armature remains the
same.

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