Question: Which is not the correct statement about moisture in coal ______________________?

• 1. inherent moisture and surface mois¬ture are different things
• 2. in some coals moisture may be present upto 40%
• 3. some moisture in coal helps in better burning which is not possible with completely dry coal
• 4. it increases thermal efficiency

Question: Which is not correct statement about effect of sulphur in fuel ___________________?

• 1. it has heating value
• 2. it helps in electrostatic precipitation of ash in flue-gases
• 3. it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
• 4. it erodes furnace walls

Question: In which case the air-fuel ratio is likely to be maximum _________________?

• 1. 2-stroke engine
• 2. 4-stroke petrol engine
• 3. 4-stroke diesef engine
• 4. gas turbine

Question: In the aircraft propellers __________________?

• 1. the propulsive matter is caused to flow around the propelled body
• 2. propulsive matter is ejected from within the propelled body
• 3. its functioning does not depend on presence of air
• 4. all of the above

Question: Work ratio of a gas turbine plant is ratio of______________________?

• 1. net work output and work done by turbine
• 2. net work output and heat supplied
• 3. work done by turbine and heat supplied
• 4. work done by turbine and net work output

Question: The main purpose of reheating in gas turbine is to__________________?

• 1. increase temperature
• 2. reduce turbine size
• 3. increase power output
• 4. increase speed

Question: Gas turbine cycle with Regenerator __________________?

• 1. increases thermal efficiency
• 2. allows high compression ratio
• 3. decreases heat loss is exhaust
• 4. allows operation at very high altitudes

Question: Reheating in multistage expansion gas turbine results in____________________?

• 1. high thermal efficiency
• 2. reduction in compressor work
• 3. decrease of heat loss in exhaust
• 4. maximum work output

Question: Maximum temprature in a gas turbine is of the order of COMPRESSORS, GAS TURBINES AND JET ENGINES______________________?

• 1. 2500°C
• 2. 2000°C
• 3. 1500°C
• 4. 700°C

Question: In air breathing jet engine, the jet is formed by expanding__________________?

• 1. gases
• 2. solids
• 3. liquid
• 4. highly heated atmospheric air