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In condensing turbine what is the back pressure of the turbine?
d Explanation: According to the back pressure steam turbines are classified into condensing and non condensing turbines. Where there is no use of exhaust steam, turbine is built as a pure condensing type turbine. In condensing turbine steam is reduced in pressure down to a vacuum pressure which is iRead more
d
See lessExplanation: According to the back pressure steam turbines are classified into
condensing and non condensing turbines. Where there is no use of exhaust steam,
turbine is built as a pure condensing type turbine. In condensing turbine steam is
reduced in pressure down to a vacuum pressure which is in accordance with the cooling
water temperature
Which statement about reaction turbine is false?
d Explanation: The expansion of steam in reaction turbine totally occurs when it flows over the turbine blades. The expansion of steam as it flows over the blades is adiabatic any friction losses between the steam and the blades are converted into heat which in turn will reheat the steam.
d
See lessExplanation: The expansion of steam in reaction turbine totally occurs when it flows over
the turbine blades. The expansion of steam as it flows over the blades is adiabatic any
friction losses between the steam and the blades are converted into heat which in turn
will reheat the steam.
Which of the following is a part of air and fuel gas circuit?
c Explanation: In air and fuel gas circuit air is drawn from the atmosphere by a forced draught fan or induced draught fan through the air preheater. In air preheater that air is heated by the heat of flue gases passing to the chimney and then admitted to the furnaces. Cooling tower and Condenser arRead more
c
See lessExplanation: In air and fuel gas circuit air is drawn from the atmosphere by a forced
draught fan or induced draught fan through the air preheater. In air preheater that air is
heated by the heat of flue gases passing to the chimney and then admitted to the
furnaces. Cooling tower and Condenser are parts of Cooling water circuit and
Economiser is part of Feed water and steam circuit
.Which of the following statement about economiser of steam power plant is wrong?
c Explanation: Economiser is used to rise the temperature of feed water. Air preheater is used to raise the temperature of intake air. Flue gases after heating boiler water Still possesses sufficient heat energy which if not used will waste. Economiser and air preheater uses that heat energy to workRead more
c
See lessExplanation: Economiser is used to rise the temperature of feed water. Air preheater is
used to raise the temperature of intake air. Flue gases after heating boiler water Still
possesses sufficient heat energy which if not used will waste. Economiser and air
preheater uses that heat energy to work and hence increase the thermal efficiency of
power plant about 15%.
What is the principle of operation of steam power plant?
d Explanation: The Rankine cycle is an idealized thermodynamic cycle of heat engine. Under this cycle heat energy is converted into mechanical energy while undergoing phase change. The heat is supplied externally to the closed loop which usually uses water as working fluid
d
See lessExplanation: The Rankine cycle is an idealized thermodynamic cycle of heat engine.
Under this cycle heat energy is converted into mechanical energy while undergoing
phase change. The heat is supplied externally to the closed loop which usually uses
water as working fluid
For increasing the thermal efficiency of thermal power plant pressure in condenser should be
a Explanation: The thermal efficiency can be effectively increased by decreasing the pressure in the condenser. Pressure in condenser is kept very low usually 0.04 kg/cm2
a
See lessExplanation: The thermal efficiency can be effectively increased by decreasing the
pressure in the condenser. Pressure in condenser is kept very low usually 0.04 kg/cm2
Overall efficiency of thermal power plant is equal to ___________
c Explanation: Thermal efficiency of steam power plant is the ratio of the heat equivalent of mechanical energy transmitted to the turbine shaft and the heat of the combustion. Thermal efficiency is generally quite low about 30%. Efficiency of generator is called generation efficiency
c
See lessExplanation: Thermal efficiency of steam power plant is the ratio of the heat equivalent
of mechanical energy transmitted to the turbine shaft and the heat of the combustion.
Thermal efficiency is generally quite low about 30%. Efficiency of generator is called
generation efficiency
What is the effect of increasing steam pressure on efficiency of steam power plant?
: b Explanation: The thermal efficiency of steam power plant depends upon the steam pressure. The efficiency increases with increasing steam pressure nonlinearly up to a level. After that level increase in efficiency becomes very low with respect to increasing pressure
: b
See lessExplanation: The thermal efficiency of steam power plant depends upon the steam
pressure. The efficiency increases with increasing steam pressure nonlinearly up to a
level. After that level increase in efficiency becomes very low with respect to increasing
pressure
What is the effect of increasing steam temperature of thermal power plant on its thermal efficiency?
a Explanation: Thermal efficiency of steam power plant increases with increase in steam temperature linearly. Increas in temperature of steam also causes its effect on cost. So temperature of steam is increased only upto a level at which it is economica
a
See lessExplanation: Thermal efficiency of steam power plant increases with increase in steam
temperature linearly. Increas in temperature of steam also causes its effect on cost. So
temperature of steam is increased only upto a level at which it is economica
Governing mechanism used in case of Pelton wheel turbine is ________
b Explanation: During load variation it is necessary to maintain the speed of the alternator constant. This is achieved by controlling the flow of water entering the turbine by the help of automatic adjustment of guide vanes for reaction turbine and the nozzle needle is in case of impulse turbine. SRead more
b
See lessExplanation: During load variation it is necessary to maintain the speed of the alternator
constant. This is achieved by controlling the flow of water entering the turbine by the
help of automatic adjustment of guide vanes for reaction turbine and the nozzle needle
is in case of impulse turbine. Such an operation of speed regulation called governing
and the system used to do this is called governor