SSC JE Electrical 2019 with solution SET-1

SSC JE Electrical 2019 with solution SET-1
_______is a tube that brings water to turbines

Spillway

Forebay

Trash rack

Penstock

Spillway

Forebay

Trash rack

Penstock

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SSC JE Electrical 2019 with solution SET-1
In the speed-time curve of a train, speed in and time are plotted

km/h; sec

km/s; hour

km/h; hour

km/s; sec

km/h; sec

km/s; hour

km/h; hour

km/s; sec

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SSC JE Electrical 2019 with solution SET-1
Find the frequency of rotor induced EMF of a 3-phase, 440V, 50 Hz induction motor has a slip of 10%

5Hz

2.5Hz

25Hz

50Hz

5Hz

2.5Hz

25Hz

50Hz

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SSC JE Electrical 2019 with solution SET-1
______starting method CANNOT be used for starting a 3-phase squirrel cage induction motor

Auto-transformer

Star-delta

Direct-on-line

Rotor-resistance

Auto-transformer

Star-delta

Direct-on-line

Rotor-resistance

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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?

40Ω

30Ω

10Ω

20Ω

40Ω

30Ω

10Ω

20Ω

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SSC JE Electrical 2019 with solution SET-1
Which of the following is the correct relation regarding coupled coils?

M > (L1L2)0.5

M = (L1 − L2)/2

M ≤ (L1L2)0.5

M = (L1 + L2)/2

M > (L1L2)0.5

M = (L1 − L2)/2

M ≤ (L1L2)0.5

M = (L1 + L2)/2

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