Question: Pick out the wrong statement?

• 1. The eddy viscosity is a function of the type of turbulence involved
• 2. The eddy viscosity is a fluid property
• 3. The viscosity of gas increases with increase in temperature
• 4. The viscosity of a liquid increases with decrease in temperature

Question: Pick out the wrong statement?

• 1. A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity
• 2. Newton’s law of viscosity is not applicable to the turbulent flow of fluid with linear velocitydistribution
• 3. Laminar flow of viscous liquids is involved in the lubrication of various types of bearings
• 4. Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes

Question: By-products are _____________ recovered in ‘Beehive ovens’ ?

• 1. Fully
• 2. Partially
• 3. Not at all
• 4. Negligibly

Question: Anthracite coal ____________________?

• 1. Contains more volatile matter than bituminous coal
• 2. Ignites more easily than bituminous coal
• 3. Is essentially a coking coal
• 4. Burns with short, bluish, yellow-tipped flame producing very little smoke

Question: Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called_________________?

• 1. Back draughting
• 2. Banking
• 3. Under pressurising
• 4. None of these

Question: Stack heat losses can be minimised by________________?

• 1. Controlling the excess air
• 2. Oxygen enrichment of combustion air
• 3. Using low c.v. fuels
• 4. Maintaining proper draft in the furnace

Question: Calorific value of bituminous coal may be around ______________ Kcal/kg?

• 1. 500
• 2. 1500
• 3. 6500
• 4. 20000

Question: Calorific values of both the solid as well as the liquid fuels can be determined by ______________ calorimeter?

• 1. Bomb
• 2. Boy’s
• 3. Junkers
• 4. None of these

Question: Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?

• 1. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
• 2. It reduces its calorific value tremendously
• 3. It reduces its flame temperature tremendously
• 4. There are chances of explosion during preheating

Question: Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about________________?

• 1. 8800 kcal/m3
• 2. 8800 kcal/kg
• 3. Same as that of coal middling
• 4. 25000 kcal/kg