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ETO – ETO – Section 2 : 2023/MAR/05

Question

Q5. (a) Describe the no-load saturation characteristic of a d.c. generator. (6)

(b) A 400V shunt motor has an armature resistance of 0.3 ohm and a shunt-field circuit resistance of 300 ohm. Calculate the speed attained by the motor when the current taken from the supply is (i) 30A and (ii) 50A. The open-circuit characteristic of the machine, when driven as a generator at 1500 rev/min, is given by the following figures:

$F i e l d C u r r e n t (A)$	$0.25$	$0.5$	$0.75$	$1.0$	$1.25$	$1.5$
$O p e n - c i r c u i t V o l t a g e$	$220$	$398$	$515$	$598$	$638$	$662$

Neglect the effects of armature reaction (10)

Asked in Year/Month/Ques No.

2023/MAR/05

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