19 A furnace is heated by combusting a gaseous fuel of composition  and  with dry air. The Orsat analysis of products of combustion (POC) is  and .

i) volume of POC at NTP in m3 is close to

a) 2.53

b) 2.60

c) 2.57

d) 2.59

ii)  Volume of air at NTP in m3 is close to

a) 1.916

b) 1.876

c) 1.098

d) 1.076

iii) Percent excess air is close to

a) 70

b) 79

c) 82

d) 78

20)   A pitot tube is installed at the centre of a pipe of diameter 0.3m. The pipe carries air at . Air is flowing at gauge pressure. Pitot tube measures a pressure difference of 50 mm water. Calculate flow rate of air in pipe. Assume pitot coefficient unity.