Electrical Engineering - DC Generators and Motors - Part 2, Study notes of Electrical and Electronics Engineering

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D.C. Generators and Motors

Electrical Engineering (ELE-232)

Problem

• (^) A shunt generator supplies a 20 kW load at 200 V through cables of resistance, R = 100 mili-ohm. If the field winding resistance, Rf =50 ohm and the armature resistance, Ra = 40 mili-ohm, determine (a) the terminal voltage, and (b) the e.m.f. generated in the armature. 2

Solution

4

Solution

MZS FKEE, UMP 5

Solution

MZS FKEE, UMP 7

Solution

MZS FKEE, UMP 8

Solution

MZS FKEE, UMP 10

Problem

• (^) Determine the terminal voltage of a generator which develops an e.m.f. of 200 V and has an armature current of 30 A on load. Assume the armature resistance is 0. 11

Problem

• (^) A generator is connected to a 60 load and a current of 8 A flows. If the armature resistance is 1 ohm determine
• (^) (a) the terminal voltage, and
• (^) (b) the generated e.m.f. 13

Solution

14

Solution

MZS FKEE, UMP 16

Problem

• (^) A short-shunt compound generator supplies 80 A at 200 V. If the field resistance, Rf = 40 ohm, the series resistance, Rse = 0.02 ohm and the armature resistance, Ra = 0.04 ohm , determine the e.m.f. generated. 17

Problem

• (^) A 10 kW shunt generator having an armature circuit resistance of 0.75 ohm and a field resistance of 125 ohm, generates a terminal voltage of 250 V at full load. Determine the efficiency of the generator at full load, assuming the iron, friction and windage losses amount to 600 W. 19

Solution

MZS FKEE, UMP 20