Question: The draught which a chimney produces is called_____________?

• 1. induced draught
• 2. natural draught
• 3. forced draught
• 4. balanced draught

Question: The modern steam turbines are___________?

• 1. impulse turbines
• 2. reaction turbines
• 3. impulse-reaction turbines
• 4. none of the above

Question: Economiser is used to heat_____________?

• 1. air
• 2. feed water
• 3. flue gases
• 4. all above

Question: Mercury is a choice with steam in binary vapour cycle because it has____________?

• 1. higher critical temperature and pressure
• 2. higher saturation temperature than other fluids
• 3. relatively low vapourisation pressure
• 4. all above

Question: Reheat cycle in steam power plant is used to________________?

• 1. utilise heat of flue gases
• 2. increase thermal efficiency
• 3. improve condenser performance
• 4. reduce loss of heat

Question: In regenerative cycle feed water is heated by_____________?

• 1. exhaust gases
• 2. heaters
• 3. draining steam from the turbine
• 4. all above

Question: The maximum percentage gain in Regenerative feed heating cycle thermal efficiency____________?

• 1. increases with number of feed heaters increasing
• 2. decreases with number of feed heaters increasing
• 3. remains same unaffected by number of feed heaters
• 4. none of the above

Question: In a regenerative feed heating cycle, the greatest economy is affected___________?

• 1. when steam is extracted from only one suitable point of steam turbine
• 2. when steam is extracted from several places in different stages of steam turbine
• 3. when steam is extracted only from the last stage of steam turbine
• 4. when steam is extracted only from the first stage of steam turbine

Question: In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating________________?

• 1. decreases with increase in Rankine cycle efficiency
• 2. increases with increase in Rankine cycle efficiency
• 3. is unaffected by increase in Rankine cycle efficiency
• 4. none of the above

Question: Regenerative cycle thermal efficiency_______________?

• 1. is always greater than simple Rankine thermal efficiency
• 2. is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure
• 3. is same as simple Rankine cycle thermal efficiency
• 4. is always less than simple Rankine cycle thermal efficiency