187) The efficiency of jet engine is

higher at ground

higher at high altitudes

same at all altitudes

higher at high speed

Answer is:

higher at high altitudes

directly proportional to clearance volume

greatly affected by clearance volume

not affected by clearance volume

inversely proportional to clearance volume

Answer is:

it is inefficient

it is bulky

it requires cooling water for its operation

None of These

Answer is:

increase in net output but decrease in thermal efficiency

increase in thermal efficiency but decrease in net output

increase in both thermal efficiency and net output

decrease in both thermal efficiency and net output

Answer is:

melting point rises slightly and boiling point drops markedly

melting point rises markedly and boiling point drops markedly

melting point drops slightly and boiling point drops markedly

melting point drops slightly and boiling point drops slightly

Answer is: