Which of the following refrigerant has the lowest boiling point? Ammonia Carbon

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Question
Which of the following refrigerant has the lowest boiling point?
Options
A. Ammonia
B. Carbon dioxide
C. Sulphur dioxide
D. R-12

Correct Answer

Carbon dioxide

More questions

1. A hydraulic ram is a device used to
Options
A. store the energy of water
B. increase the pressure of water
C. to lift water from deep wells
D. to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

6. Coke is produced
Options
A. when coal is first dried and then crushed to a fine powder by pulverising machine
B. from the finely ground coal by moulding under pressure with or without a binding material
C. when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
D. by heating wood with a limited supply of air to a temperature not less than 280�C

8. In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is __________ the relative velocity of steam at inlet tip of the blade.
Options
A. equal to
B. less than
C. greater than

9. The overall isothermal efficiency of the compressor is defined as the ratio of
Options
A. work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
B. isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
C. volume of free air delivery per stroke to the swept volume of the piston
D. isentropic power to the power required to drive the compressor

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