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661.

A power system consists of 300 buses out of which 20 buses are generator buses, 25 buses are the ones with reactive power support and 15 buses are the ones with fixed shunt capacitors. All the other buses are load buses. It is proposed to perform a load flow analysis for the system using Newton-Raphson method. The size of the Newton-Raphson Jacobian matrix is
[1 mark]
(a) 553×553
(b) 540×540
(c) 555×555
(d) 554×554

asked in Electrical Engineering, 2003

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662.

Bundled conductors are mainly used in high voltage overhead transmission lines to [1 mark]
(a) reduce transmission line losses
(b) increase mechanical strength of the line
(c) reduce corona
(d) reduce sag

asked in Electrical Engineering, 2003

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663.

No-load test on a 3-phase induction motor was conducted at different supply voltages and a plot of input power versus voltage was drawn. This curve was extrapolated to intersect the y-axis. This intersection point yields
[1 mark]
(a) Core loss
(b) Stator copper loss
(c) Stray load loss
(d) Friction and windage loss

asked in Electrical Engineering, 2003

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664.

Curves X and Y in Fig.Q9 denote open circuit and full-load zero power factor (zpf) characteristics of asynchronous generator. Q is a point on the zpf characteristics at 1.0 p.u. voltage. The vertical distance PQ in Fig. gives the voltage drop across

[1 mark]
(a) Synchronous reactance
(b) Magnetizing reactance
(c) Potier reactance
(d) Leakage reactance

asked in Electrical Engineering, 2003

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665.

A stand-alone engine driven Synchronous generator is feeding a partly inductive load. A capacitor is now connected across the load to completely nullify the inductive current. For this operating condition.
[1 mark]
(a) the field current and fuel input have to be reduced
(b) the field current and fuel input have to be increased
(c) the field current has to be increased and fuel input left unaltered
(d) the field current has to be reduced and fuel input left unaltered

asked in Electrical Engineering, 2003

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666.

Group I lists different applications and Group II lists the motors for these applications. Match the application with the most suitable motor and choose the right combination among the choices given thereafter

Group I Group II

P: Food mixer 1: Permanent magnet dc motor

Q: Cassette tape recorder 2: Single phase induction motor

R: Domestic water pump 3: Universal motor

S: Escalator 4: Three phase induction motor

5: DC series motor

6: Stepper motor

[1 mark]
(a) P – 3, Q – 6, R – 4, S - 5
(b) P – 1, Q – 3, R – 2, S - 4
(c) P – 3, Q – 1, R – 2, S - 4
(d) P – 3, Q – 2, R – 1, S - 4

asked in Electrical Engineering, 2003

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