SSC JE ELECTRICAL 2019 WITH SOLUTION SET-1 QUIZ

In the full-wave rectifier circuit shown in the figure, the diodes that conduct when the positive half-wave of AC signal applied are

D4, D1

D1, D2

D2, D3

D3, D4

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______starting method CANNOT be used for starting a 3-phase squirrel cage induction motor

Auto-transformer

Star-delta

Rotor-resistance

Direct-on-line

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Two inductors of 4H and 6H are connected in series. The equivalent inductance of this combination is

2.4 H

4 H

10 H

6 H

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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 and current are in phase with each other

Voltage lags current by 45°

Voltage lags current by 30°

Voltage leads current by 45°

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A synchronous motor runs at 600rpm, which of the following case is true?

P = 10, f = 60 Hz

P = 8, f = 50 Hz

P= 12, f = 50 Hz

P = 12, f = 60 Hz

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The resistive component of the rotor with resistance R2 offered to the backward rotating flux wave in a single-phase motor runs with slip s is given as

R2 ⁄ (2 − S)

R2 ⁄ (1 + S)

R2 ⁄ S

R2 ⁄ (1 − S)

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If N = linkage flux, then the linkage flux per unit current is defined as:<br/>

Inductance

Magnetomotive force

Leakage coefficient

Inductive reactance

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A three-phase induction machine, when it is operating like a motor, the range of slip is given by

0 ≤ s ≤ 1

0 > s > −1

−1 > s > −2

1 < a < 2

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The function of condenser in a Thermal power plant is:

Condense water

Condense used steam into water

Purify steam

Purify water

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In the speed-time curve of a train, speed in and time are plotted

km/h; hour

km/h; sec

km/s; hour

km/s; sec

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