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If the power system network is at Vs∠δ and receiving end voltage is Vr∠0 consisting of the impedance of TL as (R+j5)Ω. For maximum power transfer to the load, the most appropriate value of resistance R should be __________
a Explanation: For maximum power transfer, X=√3 R 3=√3 R R=√3
a
See lessExplanation: For maximum power transfer, X=√3 R
3=√3 R
R=√3
A 500 MW, 21 kV, 50 Hz three phase two pole alternator has 0.8 lagging p.f. with moment of inertia of 27.5×103 kgm-2 . The inertia constant H will be _______ MJ/MVA
d) 2.62
d) 2.62
See lessCoincidence factor is reciprocal of ___________
d Explanation: Coincidence factor is the ratio of total maximum demand to the sum of individual maximum demands which is the reciprocal of diversity factor.
d
See lessExplanation: Coincidence factor is the ratio of total maximum demand to the sum of
individual maximum demands which is the reciprocal of diversity factor.
Power plants to be employed as base load plants are not required to have ___________
c Explanation: Capability of quick start is the essential requirement for peak load plant. Base load plants are started once and operated for long time so capability of quick start is not an essential requirement for base load plants.
c
See lessExplanation: Capability of quick start is the essential requirement for peak load plant.
Base load plants are started once and operated for long time so capability of quick start
is not an essential requirement for base load plants.
The system supplying base and peak loads will be more economical if power is supplied by ________
d Explanation: The system containing only one power plant would be uneconomical since. Gas turbine and Diesel power plants operate economically only for peak load and Thermal power plant is suitable only for base load. Hence such power loads should not be supplied from single power plant.
d
See lessExplanation: The system containing only one power plant would be uneconomical since.
Gas turbine and Diesel power plants operate economically only for peak load and
Thermal power plant is suitable only for base load. Hence such power loads should not
be supplied from single power plant.
Which of the following pollutants emitted by thermal power plant is a cause of global warming?
b Explanation: Carbon monoxide and carbon dioxide are also emitted during the combustion of coal. Carbon monoxide is very toxic pollutant but it gets converted into carbon dioxide in open atmosphere surrounding the power station. On the other hand carbon dioxide has been identified as major cause ofRead more
b
See lessExplanation: Carbon monoxide and carbon dioxide are also emitted during the
combustion of coal. Carbon monoxide is very toxic pollutant but it gets converted into
carbon dioxide in open atmosphere surrounding the power station. On the other hand
carbon dioxide has been identified as major cause of global warming
The system supplying base and peak loads will be more economical if power is supplied by _______
d Explanation: The system containing only one power plant would be uneconomical since. Gas turbine and Diesel power plants operate economically only for peak load and Thermal power plant is suitable only for base load. Hence such power loads should not be supplied from single power plant.
d
See lessExplanation: The system containing only one power plant would be uneconomical since.
Gas turbine and Diesel power plants operate economically only for peak load and
Thermal power plant is suitable only for base load. Hence such power loads should not
be supplied from single power plant.
The various peak demands of the load above the base load of power plant is called _________
c Explanation: If the load is to be supplied from one power plant only then the installed capacity of the plant should be equal to the peak load or more. Otherwise during peak load period the plant will not be able to meet the load demand.
c
See lessExplanation: If the load is to be supplied from one power plant only then the installed
capacity of the plant should be equal to the peak load or more. Otherwise during peak
load period the plant will not be able to meet the load demand.
f there is one power plant only, the installed capacity of that power plant should be equal to ____
c Explanation: If the load is to be supplied from one power plant only then the installed capacity of the plant should be equal to the peak load or more. Otherwise during peak load period the plant will not be able to meet the load demand.
c
See lessExplanation: If the load is to be supplied from one power plant only then the installed
capacity of the plant should be equal to the peak load or more. Otherwise during peak
load period the plant will not be able to meet the load demand.
The unvarying load, which occurs almost the whole day on the power plant is called _________
a Explanation: The load on any power plant can be conveniently considered into two parts namely ‘base load’ and ‘peak load’. The unvarying load which occurs almost the whole day on the power plant is called base load
a
See lessExplanation: The load on any power plant can be conveniently considered into two parts
namely ‘base load’ and ‘peak load’. The unvarying load which occurs almost the whole
day on the power plant is called base load