Related Questions

Thermal efficiency of furnaces can be improved by
A Waste heat recovery from flue gas
B Minimising heat losses from furnace walls
C Maintaining proper draught
D All of the above
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
Thermal spalling mainly occurs during __________ of furnaces.
A Cooling down
B Warming up
C Both A & B
D Neither A nor B
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
A Remain same
B Decrease
C Increase
D None of the above
Maximum heat transfer in high temperature furnaces is by
A Conduction
B Convection
C Radiation
D Either A, B or C; depends on the type of furnace
Thermal efficiency of a thermal power plant is of the order of
A 15%
B 20%
C 30%
D 45%
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called
A Net efficiency
B Efficiency ratio
C Relative efficiency
D Overall efficiency
The ratio of the indicated thermal efficiency to the air standard efficiency is known as
A Mechanical efficiency
B Overall efficiency
C Volumetric efficiency
D Relative efficiency
Direct arc furnaces have which of the following power factors?
A Unity
B Low, lagging
C Low, leading
D Any of the above
Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?
A Pyrometer
B Thermocouple
C Thermometer
D Thermistor

Next steps