SSC JE Electrical Engineering 25th May 2014 Shift-1

Instructions

For the following questions answer them individually

Question 151

The synchronous speed of a three phase induction motor having 20 poles and connected to a 50 Hz source is

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Question 152

A circuit with a resistor, inductor and capacitor in series is resonant of $$f_o$$ Hz. If all the component values are now doubled the new resonant frequency is

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Question 153

A 2 cm long coil has 10 turns and carries a current of 750 mA. the magnetising force of the coil is

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Question 154

A consumer has annual consumption of 700800 units. If his maximum demand is 200 kW. The load factor will be

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Question 155

The rated voltage of a 3-phase power system is given as

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Question 156

For a half wave rectifier sine wave the ripple factor is

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Question 157

Which one of the following bridges is generally used for measurement of frequency and also capacitance?

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Question 158

Two voltmeter of (0-300 V) range are connected in parallel to a A.C. circuit. One voltmeter is moving iron type reads 200 V. If the other is PMMC instrument, its reading will be

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Question 159

The least number of $$1 - \phi$$ wattmeters required to measure total power consumed by an unbalanced load fed from a $$3 \phi$$ , 4 wire system is

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Question 160

Total capacitance between the points L and M in figure is

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