Question: Choose the wrong statement ?

• 1. Temperature of medium being cooled must be below that of the evaporator
• 2. Refrigerant leaves the condenser as liquid
• 3. All solar thermally operated absorption systems are capable only of intermittent operation
• 4. frost on evaporator reduces heat transfer

Question: Pick up the incorrect statement?

• 1. lithium bromide used in vapour absorption cycle is nonvolatile
• 2. lithium bromide plant can’t operate below 0°C
• 3. a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing
• 4. concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator

Question: The three “Ts” for good combustion are____________________?

• 1. temperature, time, and turbulance
• 2. total air, true fuel, and turbulance
• 3. thorough mixing, total air, and temperature
• 4. total air, time, and temperature

Question: The safety valve on boiler drum compared to safety valve on super heater is set at ________________?

• 1. same value
• 2. higher value
• 3. lower value
• 4. lower/higher depending on steam flow

Question: The proximate analysis of fuel lists__________________?

• 1. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume
• 2. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
• 3. fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
• 4. fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

Question: Green coal, in order to be burnt, must be____________________?

• 1. heated sufficiently
• 2. burnt in excess air
• 3. heated to its ignition point
• 4. burnt as powder

Question: Sulphur in coal results in___________________?

• 1. causing clinkering and slagging
• 2. corroding air heaters
• 3. spontaneous combustion during coal storage
• 4. all of the above

Question: The behaviour of coal in a furnace is determained by_______________________?

• 1. the content of sulphur
• 2. the content of ash and heating value
• 3. the proximate analysis
• 4. the exact analysis

Question: Pour point of fuel oil is the____________________?

• 1. lowest temperature at which oil will flow under set condition
• 2. storage temperature
• 3. temperature at which fuel is pumped through burners
• 4. temperature at which oil is transported

Question: Gusset stays in a boiler are provided to____________________?

• 1. prevent the bulging of flat surfaces
• 2. avoid explosion in furnace
• 3. prevent leakage of hot flue gases
• 4. support furnace freely from top