LOGICAL DATABASE DESIGN QUIZ

In a thermal power plant, which of its following components needs maximum maintenance attention

Condenser.

Super heater.

Boiler.

Steam turbine.

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Positive, negative and zero sequence impedances of line are 2,2 and 5 pu respectively. Find self and mutual impedances respectively?

1 and 3 pu

2 and 5 pu

3 and 1 pu

2 and 2 pu

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The economics of power plant is greatly influenced by

nether 1 nor 2

load factor

both 1 and 2

diversity factor

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A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm sinωt?

4.68 msec

9.68 msec

2.63 msec

1.47 msec

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The rating of fuse wire is always expressed in

amperes.

kWh.

ampere-hours.

ampere-volts.

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If all the sequence voltages at the fault point in a power system are equal, then the fault point is a

LLG

LLL

LL

LG

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The steam power plant efficiency can be improved by

using large quantity of water.

burning large amount of coal.

using high temperature and high pressure steam.

decreasing the load on the plant.

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The overall efficiency of a steam power plant equal to

product of boiler efficiency, turbine efficiency and generator efficiency.

regenerative cycle.

binary vapor cycle.

the Rankine cycle.

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Earth fault relay uses the which of the following sequence currents?

positive sequence

zero sequence

any of the above

negative sequence

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Which of the following statements are true?

nether 1 nor 2

Bus impedance matrix is a full matrix

both 1 and 2

Bus admittance matrix is a sparse matrix

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