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715.

A 1 kVA, 230V/100V, single phase, 50 Hz transformer having negligible winding resistance and leakage inductance is operating under saturation, while 250 V, 50 Hz sinusoidal supply is connected to the high voltage winding. A resistive load is connected to the low voltage winding which draws rated current. Which one of the following quantities will not be sinusoidal? [1 mark]
(a) Voltage induced across the low voltage winding
(b) Core flux
(c) Load current
(d) Current drawn from the source

asked in Electrical Engineering, 2002

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716.

A dc series motor fed from rated supply voltage is overloaded and its magnetic circuit is saturated. The torque-speed characteristic of this motor will be approximately represented by which curve of Fig.?

[1 mark]
(a) Curve A
(b) Curve B
(c) Curve C
(d) Curve D

asked in Electrical Engineering, 2002

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717.

If a 400V, 50 Hz, star connected, 3 phase squirrel cage induction motor is operated from a 400 V, 75 Hz supply, the torque that the motor can now provide while drawing rated current from the supply? [1 mark]
(a) reduces
(b) increases
(c) remains the same
(d) increase or reduces depending upon the rotor resistance

asked in Electrical Engineering, 2002

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718.

Given a vector field F, the divergence theorem states that
[1 mark]

asked in Electrical Engineering, 2002

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719.

Two in-phase, 50 Hz sinusoidal waveform of unit amplitude are fed into channel 1 and channel 2 respectively of an oscilloscope. Assuming that the voltage scale, time scale and other settings are exactly the same for both the channels, what would be observed if the oscilloscope is operated in X-Y mode? [1 mark]
(a) A circle of unit radius
(b) An ellipse
(c) A parabola
(d) A straight line inclined at 45° with respect to the x-axis

asked in Electrical Engineering, 2002

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720.

The graph of an electrical network has N nodes and B branches. The number of links, L, with respect to the choice of a tree, is given by
[1 mark]
(a) B – N + 1
(b) B + N
(c) N – B + 1
(d) N – 2B -1

last reply by CpjJwWHV • 10 years ago • asked in Electrical Engineering, 2002

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