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475.

An 800 kV transmission line has a maximum power transfer capacity on the operated at 400 kV with the series reactance unchanged, the new maximum power transfer capacity is approximately [1 mark]
(a) P
(b) 2P
(c) P/2
(d) P/4

asked in Electrical Engineering, 2005

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476.

The p.u. parameters for a 500 MVA machine on its own base are:
Inertia M = 20 p.u.; reactance X = 2 p.u.
The p.u. values of inertia and reactance on 100 MVA common base, respectively, are [1 mark]
(a) 4, 0.4
(b) 100, 10
(c) 4, 10
(d) 100, 0.4

last reply by CpjJwWHV • 13 years ago • asked in Electrical Engineering, 2005

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477.

For an induction motor, operating at a slip s, the ratio of gross power output to air gap power is equal to: [1 mark]
(a) (1-s)²
(b) (1-s)
(c) (1-s)^1/2
(d) (1-√s)

asked in Electrical Engineering, 2005

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478.

On the torque/speed curve of induction motor shown in Fig, four points of operation are market as W, X, Y and Z. Which one of them represents the operation at a slip greater than 1?

[1 mark]
(a) W
(b) X
(c) Y
(d) Z

asked in Electrical Engineering, 2005

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479.

Which three-phase connection can be used in a transformer to introduce a phase difference of 30° between its output and corresponding input line voltages [1 mark]
(a) Star - Star
(b) Star - Delta
(c) Delta - Delta
(d) Delta - Zigzag

asked in Electrical Engineering, 2005

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480.

The equivalent circuit of a transformer has leakage reactance X₁ , X'₂ and
magnetizing reactance . X_M Their magnitudes satisfy [1 mark]
(a) X₁ >> X'₂ >> X_M
(b) X₁ ≈ X'₂ >> X_M
(c) X₁ << X'₂ << X_M
(d) X₁ ≈ X'₂ << X_M

asked in Electrical Engineering, 2005

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