Related Questions

In compressed air tunnelling, the volume of free air provided is
A 6 m3 per second per m2 of face area
B 6 m3 per minute per m2 of face area
C 20 m3 per minute per m2 of face area
D 6 m3 per hour per m2 of face area
Compressed dry air is used as the cutting fluid, while machining
A Steel
B Cast iron
C Aluminium
D None of these
In closed cycle gas turbine, the air is compressed
A Isothermally
B Isentropically
C Polytropically
D None of these
To avoid moisture troubles, the compressed air main line should
A Rise gradually towards the point of use
B Drop gradually towards the point of use
C Be laid vertically
D Be laid exactly horizontally
In a closed cycle gas turbine, the air is compressed
A Isothermally
B Polytropically
C Isentropically
D None of these
In a double acting compressor, the air is compressed
A In one cylinder
B In two cylinders
C In a single cylinder on both sides of the piston
D In two cylinders on both sides of the piston
The overall efficiency of the compressed air system is the
A Ratio of shaft output of the air motor to the shaft input to the compressor
B Ratio of shaft input to the compressor to the shaft output of air motor
C Product of shaft output of air motor and shaft input to the compressor
D None of the above
In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in
A Exit nozzle, which is a constant volume process
B Exit nozzle, which is essentially an isentropic process
C Turbine blades, which is a constant volume process
D Turbine blades, which is essentially an isentropic process
The most suitable soil for compressed air tunnelling is
A Silt
B Sand
C Clay
D Gravel
'Utilities' in a chemical process plant includes compressed air, steam, water, electrical power, oxygen, acetylene, fuel gases etc. Utility costs for ordinary chemical process plants ranges roughly from __________ percent of the total product cost.
A 1 to 5
B 10 to 20
C 25 to 35
D 35 to 45

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