Test: Fuel Gas Analysis - 2 - Mechanical Engineering MCQ

Consider the following statements:

1. The gases measured directly by Orsat apparatus from a flue gas sample are CO₂, O₂ and N₂

2. Bomb calorimeter measures higher calorific value of fuel at constant pressure.

3. For burning 1 kg of fuel (carbon) to carbon monoxide, the stoichiometric quantity of air required is 8/3 kg

Which of the statements given above is/are correct? 

Which one of the following orders is the correct order of passing the flue gases through the different absorbents (in the flasks) during analysis in Orsat apparatus? 

Orsat apparatus is used to determine products of 

Items given in List I and List II pertain to gas analysis. Match List I with List II and select the correct answer.

In the Orsat flue gas analyser, ammoniacal cuprous chloride is used to absorb. 

In Orsat apparatus 

Consider the following statements:

1. For the combustion of pulverized coal, 5 to 10% excess air is required.

2. Air contains 21 % oxygen by weight.

3. The flue gases from a coal-fired furnace contain around 70% nitrogen byvolume.

4. In the combustion of liquid fuels the number of moles of the productsare invariably greater than the number of moles of the reactants.Of these statements 

When solid fuels are burned, the nitrogen content of the flue gas byvolume is about 

Assertion (A): In constant pressure type gas turbines, large quantity of air is used,in excess of its combustion requirements.

Reason (R): Excess air is used to compensate for inevitable air-loss due to leakagesin the system. 

The excess air required for combustion of pulverised coal is of the order of 

Dry flue gases with a composition of CO₂ = 10.4%, O₂ = 9.6 and N₂ = 80%,indicate that 

Assertion (A): Excess air supplied to a combustor increases the efficiency ofcombustion

.Reason (R): Excess air tends to lower the temperature of the products of combustion. 

Consider the following statements:

1. Forward swept blade impeller is used in draft fans.

2. Forward swept blade impeller is used in room air-conditioners.

3. Radial tipped blade impeller is used in draft fans

4. Forward swept blade impeller is used in exhaust fans.

Which of the statements given above is/are correct? 

Forced draught fans of a large steam generator have 

At constant efficiency, the horse power of a fan is 

Consider the following statements: Expansion joints in steam pipelines are installed to

1. Allow for future expansion of plant

2. Take stresses away from flanges and fittings

3. Permit expansion of pipes due to temperature rise.

Of these correct statements are 

Which one of the following fuels is used to determine the water equivalent of a bomb calorimeter? 

Amount of oxygen needed to completely burn l1lg of methane (CH₄) is

Which of the following combustion systems requires maximum excess air?

[IAS-2002]

A double acting steam engine with a cylinder diameter of 19 cm and a stroke of 30 cm has a cut-off of 0.35. The expansion ratio for this engine is nearly 

Match List I with List II and select the correct answer using the code given below the Lists:

Amount of oxygen needed to completely burn l1lg of methane (CH₄) is 

Assertion (A): The calorific value of a fuel depends on the excess air used for combustion.

Reason (R): The purpose of supplying excess air is to ensure complete combustion. 

Inside a large power boiler, the flue gas pressure will be above the atmospheric pressure 

An induced draft fan is normally located at the 

A power plant consumes coal at the rate of 80 kg/s while the combustion air required is 11kg/kg of coal. What will be the power of the F.D. fan supplying the air, if its efficiency is 80% and it develops a pressure of 1.2 m of water? (Assume density of air to be 1.2 kg/m3) 

The p-V diagram for thereciprocating steam engineis shown in the figure. Thelength A-B represents the