Steam turbines are governed by the following methods
A. Throttle governing
B. Nozzle control governing
C. By-pass governing
D. all of the above
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The cooling section in the surface condenser
A. increases the quantity of vapour extracted along with air
B. reduces the quantity of vapour extracted along with air
C. does not affect vapour quantity extracted but reduces pump capacity of air extraction pump
D. none of the above
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The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is
A. 0.555
B. 0.578
C. 0.5457
D. 0.6
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The draught in locomotive boilers is produced by
A. forced fan
B. chimney
C. steam jet
D. only motion of locomotive
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The percentage O2 by volume in atmosphere air is
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In a surface condenser if air is removed, there is
A. fall in absolute pressure maintained in condenser
B. rise in absolute pressure maintained in condenser
C. no change in absolute pressure in the condenser
D. rise in temperature of condensed steam
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Economiser is used to heat
A. air
B. feed water
C. flue gases
D. all above
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Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is
A. underfeed stoker
B. overfeed stoker
C. any
D. none of the above
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The pressure on the two sides of the impulse wheel of a steam turbine
A. is same
B. is different
C. increases from one side to the other side
D. decreases from one side to the other side
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Thorium Breeder Reactors are most suitable for India because
A. these develop more power
B. its technology is simple
C. abundance of thorium deposits are available in India
D. these can be easily designed
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The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is
A. 0.6
B. 0.578
C. 0.555
D. 0.5457
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Load carrying capacity of belt conveyor is about
A. 20 to 40 tonnes/hr
B. 50 to 100 tonnes/hr
C. 100 to 150 tonnes/hr
D. 150 to 200 tonnes/hr
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The proper indication of incomplete combustion is
A. High CO content in flue gases at exit
B. High CO2 content in flue gases at exit
C. High temperature of flue gases
D. The smoking exhaust from chimney
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In case of impulse steam turbine
A. there is enthalpy drop in fixed and moving blades
B. there is enthalpy drop only in moving blades
C. there is enthalpy drop in nozzles
D. none of the above
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Load center in a power station is
A. Center of coal fields
B. Center of maximum load of equipments
C. Center of gravity of electrical system
D. None of the above
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The percentage O2 by Weight in atmospheric air is
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Solar thermal power generation can be achieved by
A. using focusing collector or heliostates
B. using flat plate collectors
C. using a solar pond
D. any of the above system
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The modern steam turbines are
A. impulse turbines
B. reaction turbines
C. impulse-reaction turbines
D. none of the above
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The capacity of large turbo-generators varies from
A. 20 to 100 MW
B. 50 to 300 MW
C. 70 to 400 MW
D. 100 to 650 MW
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The efficiency of chimney is approximately
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