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Quiz 4
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Q.1
The percentage 02 by volume in atmosphere air is
21%
23%
77%
79%
Q.2
Bucket elevators are used for
carrying coal in horizontal direction
carrying coal in vertical direction
carrying coal in any direction
none of the above
Q.3
The maximum length of a screw conveyer is about
30 metres
40 metres
60 metres
100 metres
Q.4
Pipes carrying steam are generally made up of
steel
cast iron
copper
aluminium
Q.5
Edward?s air pump
removes air and also vapour from condenser
removes only air from condenser
removes only un-condensed vapour from condenser
removes air alongwith vapour and also the condensed water from condenser
Q.6
For Parson's reaction steam turbine, degree of reaction is
75%
100%
50%
60%
Q.7
The energy radiated by sun on a bright sunny day is approximately
700 W/m²
800 W/m²
1 kW/m²
2 kW/m²
Q.8
The average ash content in Indian co als is about
5%
10%
15%
20%
Q.9
The amount of air which is supplied for complete combustion is called
primary air
secondary air
tertiary air
none of the above
Q.10
Reheat factor is the ratio of
isentropic heat drop to useful heat drop
adiabatic heat drop to isentropic heat drop
cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop
none of the above
Q.11
Belt conveyer can be used to transport coal at inclinations upto
30°
60°
80°
90°
Q.12
A steam power station requires space
equal to diesel power station
more than diesel power station
less than diesel power station
none of the above
Q.13
Reheat factor in steam turbines depends on
exit pressure only
stage efficiency only
initial pressures and temperature only
all of the above
Q.14
Incase of reaction steam turbine
there is enthalpy drop both in fixed and moving blades
there is enthalpy drop only in fixed blades
there is enthalpy drop only in moving blades
none of the above
Q.15
Thorium Breeder Reactors are most suitable for India because
these develop more power
its technology is simple
abundance of thorium deposits are available in India
these can be easily designed
Q.16
The overall efficiency of thermal power plant is equal to
Rankine cycle efficiency
Carnot cycle efficiency
Regenerative cycle efficiency
Boiler efficiency x turbine efficiency x generator efficiency
Q.17
The main source of production of biogas is
human waste
wet cow dung
wet livestock waste
all above
Q.18
Deaerative heating is done to
Heat the water
Heat the air in the water
Remove dissolved gases in the water
None of these
Q.19
Regenerative cycle thermal efficiency
is always greater than simple Rankine thermal efficiency
is greater than simple Rankine cycle thermal efficiency only when steam is bled at particu-lar pressure
is same as simple Rankine cycle thermal efficiency
is always less than simple Rankine cycle thermal efficiency
Q.20
In De Laval steam turbine
the pressure in the turbine rotor is approximately same as in condenser
the pressure in the turbine rotor is higher than pressure in the condenser
the pressure in the turbine rotor gradually decreases from inlet to exit from condenser
none from the above
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