SSC JE Electrical Engineering 25th May 2014 Shift-2

Instructions

For the following questions answer them individually

Question 151

In a 3- phase induction motor crawling happens at

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Question 152

A 4-pole, 3-phase induction motor runs at 1440 rpm on a 50 Hz supply. Find the slip speed

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Question 153

Low voltage windings are splaced nearer to the core in the case of concentric windings because

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Question 154

If K is the phase-to-phase voltage ratio, then the line-to-line voltage ratio in a 3-phase $$Y-\triangle$$ transformer is

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Question 155

In an auto-transformer of voltage ratio $$\frac{V_{1}}{V_{2}},V_{1}>V_{2}$$, the fraction of power tranferred inductively is proportional to

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Question 156

Stepped core is used in transformers in order to reduce

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Question 157

Commutation conditions at full load for large DC machines can be efficiently checked by the

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Question 158

The emf induced in a DC shunt generator is 230 V. The armature resistance is $$0.1Ω$$. If the armature current is 200 A, the terminal voltage will be

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Question 159

The commutator of a DC generator acts as

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Question 160

Fleming's left hand rule is applicable to

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