SSC JE Electrical 2019 with solution SET-1

SSC JE Electrical 2019 with solution SET-1
At f = _____R – L – C series circuit operates at unity power factor

1/RC

1/2π√LC

1 ⁄ LC

1 ⁄ RLC

1/RC

1/2π√LC

1 ⁄ LC

1 ⁄ RLC

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SSC JE Electrical 2019 with solution SET-1
The below symbol which is used in single line diagrams represents

Circuit breaker

Current transformer

Potential transformer

Power transformer

Circuit breaker

Current transformer

Potential transformer

Power transformer

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SSC JE Electrical 2019 with solution SET-1
Identify the INCORRECT statement with regards to synchronous motors

It is a self-starting machine

The field winding is placed on the rotor

It is a constant speed motor

The armature winding is placed on the stator

It is a self-starting machine

The field winding is placed on the rotor

It is a constant speed motor

The armature winding is placed on the stator

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SSC JE Electrical 2019 with solution SET-1
Z1 and Z2 are connected in series to form a load. A wattmeter’s current coil is connected in series with the load, whereas its pressure coil is connected across Z2. The wattmeter reads

Power consumed by Z1 and Z2

Zero always

Power consumed by Z1

Power consumed by Z2

Power consumed by Z1 and Z2

Zero always

Power consumed by Z1

Power consumed by Z2

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SSC JE Electrical 2019 with solution SET-1
Three lamps are connected in series across a 120V supply and take a current of 1.5A. If the resistance of two of the lamps is 30Ω, what is the resistance of the third lamp?

20Ω

10Ω

40Ω

30Ω

20Ω

10Ω

40Ω

30Ω

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SSC JE Electrical 2019 with solution SET-1
In the circuit shown, if R = 0, then the phase angle between v(t) and i(t) is

90°

60°

30°

0°

90°

60°

30°

0°

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