SSC JE Electrical 2019 with solution SET-1

SSC JE Electrical 2019 with solution SET-1
Lamp efficiency is measured in

Candela/watt

Lumen/lux

Lux/watt

Lumen/watt

Candela/watt

Lumen/lux

Lux/watt

Lumen/watt

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SSC JE Electrical 2019 with solution SET-1
Two coupled coils with L1 = L2 = 0.5H have a coupling coefficient of K = 0.75. The turn ratio N1 ⁄ N2 = ?

1

4

2

0.5

1

4

2

0.5

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SSC JE Electrical 2019 with solution SET-1
An electric heater is connected across 230V and it draws a current of 2A. Then the resistance offered by the heater is?

29 ohm

290 ohm

115 ohm

11.5 ohm

29 ohm

290 ohm

115 ohm

11.5 ohm

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SSC JE Electrical 2019 with solution SET-1
In an AC network, the load connected is (10 + j10). The phase relation between the voltage applied and the current through the load is:

Voltage lags current by 30°

Voltage leads current by 45°

Voltage lags current by 45°

Voltage and current are in phase with each other

Voltage lags current by 30°

Voltage leads current by 45°

Voltage lags current by 45°

Voltage and current are in phase with each other

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SSC JE Electrical 2019 with solution SET-1
A magnetic circuit is applied with a current that changes at a rate of 5 A/sec. The circuit has an inductance of 2H, then the self-induced EMF is

−4 V

−10 V

0.4 V

−2.5 V

−4 V

−10 V

0.4 V

−2.5 V

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SSC JE Electrical 2019 with solution SET-1
Identify the important feature of a DC series motor

Medium starting torque

Zero starting torque

Low starting torque

High starting torque

Medium starting torque

Zero starting torque

Low starting torque

High starting torque

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