90.

91.

92.

93.

94.

95.

Which hydrocarbons have chain structure?
(A) Paraffins (B) Naphthalenes
(C) Benzene (D) None of these

In a given combustion process

(i) The maximum temperature achieved through adiabatic complete combustion
varies with the type of reaction and percent of theoretical air supplied.

(ii) An increase in the air fuel ratio will effect an increase in the maximum
temperature

(iii) For a given fuel and a given pressure and temperature of the reactants,
the maximum adiabatic flame temperature that can be achieved is with a
stoichiometric mixture.

Which of these statements are correct?

(A) Only (i) and (ii) (B) Only (ii) and (iii)

(C) Only (i) and (iii) (D) All are correct

If a coal sample gave the analysis by weight of carbon 84% minimum weight of
oxygen required per kg of coal for complete combustion is

(A) 2.24 kg (B) 0.32 kg

(C) 3.08 kg (D) None of these

Weight of dry flue gas per kg of fuel is

(A) Weight of carbon in 1 kg of fuel to the weight of carbon in 1 kg of flue gas
(B) Weight of carbon in 1 kg of flue gas to the weight of carbon in 1 kg of fuel
(C) Weight of oxygen in 1 kg of flue gas to the weight of carbon in 1 kg of fuel
(D) Weight of oxygen in 1 kg of fuel to the weight of carbon in 1 kg of flue gas

For complete conversion to water or steam, 1 kg of hydrogen requires
(A) 4 kg of oxygen (B) 8 kg of oxygen
(C) 9 kg of oxygen (D) None of these

Mass of carbon contained in 1 kg of flue gas is calculated from

(A) Mass of carbon dioxide and mass of carbon monoxide present in them
(B) Mass of carbon dioxide and mass of oxygen in them

(C) Mass of carbon monoxide and mass of oxygen in them

(D) None of these

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