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This set of Thermal Engineering 1 Multiple Choice Questions & Answers (MCQs) focuses on Two Phase System Set 2
Q1 | Total heat of a substance is also known as
- internal energy
- entropy
- thermal capacity
- enthalpy
Q2 | Equivalent evaporation of water is the evaporation "for a feed water supply at 100°C
- and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2
- and its corresponding conversion into dry steam at desired boiler pressure
- conversion into steam at atmospheric condition
- conversion into steam at the same pres-sure at which feed water is supplied
Q3 | Cochran boiler is a
- horizontal fire-tube boiler
- horizontal water-tube boiler
- veritcal water-tube boiler
- vertical fire tube boiler
Q4 | Lancashire 'boiler is a
- stationary fire tube boiler
- stationary water tube boiler
- water tube boiler with natural/forced circulation
- mobile fire tube boiler
Q5 | The diameter of Cornish boiler is of the order of
- 1-2 m
- 1.5-2.5 m
- 2-3 m
- 2.5-3.5 m
Q6 | The lenght of Cornish boiler is of the order of
- 2-4 m
- 3-5 m
- 5-7.5 m
- 7-9 m
Q7 | The diameter of fire tube of Cornish boiler compared to its shell is
- one half
- one third
- one-fifth
- two-fifth
Q8 | Water tube boilers are those in which
- flue gases pass through tubes and water around it
- water passes through the tubes and flue gases around it
- work is done during adiabatic expansion
- change in enthalpy
Q9 | Lancashire boiler is of
- stationary fire tube-type
- horizontal type
- internally fired type
- all of the above.
Q10 | Fire tube boilers are those in which
- flue gases pass through tubes and water around it
- water passes through the tubes and flue gases around it
- forced circulation takes place
- tubes are laid vertically
Q11 | The number of flue tubes in Lancashire boiler is
- zero
- one
- two
- four
Q12 | Which of the following is a water tube boiler
- Lancashire boiler
- Cochran boiler
- Cornish boiler
- Babcock and Wilcox boiler
Q13 | The diameter of cylindrical shell of the Lancashire boiler is of the order of
- 1 to 1.25m
- 1 to 1.75 m
- 2 to 4 m
- 1.75 to 2.75 m
Q14 | A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are
- supplied by same manufacturer loose and assembled at site
- supplied mounted on a single base
- purchased from several parties and packed together at site
- packaged boiler does not exist
Q15 | The diameter of internal flue tubes in a Lancashire boiler compared to its shell is
- one-half
- one-third
- one-fourth
- two-fifth.
Q16 | The water tubes in a babcock and wilcox boiler are
- horizontal
- vertical
- inclined
- horizontal and inclined
Q17 | A boiler in India should conform to safety regulations of
- DIN
- BS
- ASTM
- IBR
Q18 | The difference between cornish boiler and lancashire boiler is that
- former is fire tube type and latter is water tube type boiler
- former is water tube type and latter is fire tube type
- former contains one fire tube and latter contains two fire tubes
- former contains two fire tubes and latter contains one fire tube
Q19 | A fusible plug is fitted in small boilers in order to
- avoid excessive build up of pressure
- avoid explosion
- extinguish fire if water level in the boiler falls below alarming limit
- control steam dome
Q20 | The fusible plug in small boilers is located
- in the drum
- in the fire tubes
- above steam dome
- over the combustion chamber
Q21 | Fusible plug for boilers is made of fusible metal containing tin, lead, and
- bismuth
- copper
- aluminium
- nickel
Q22 | The ratio of heat utilised to produce steam and the heat liberated in furnace is known as
- boiler effectiveness
- boiler evaporative capacity
- factor of evaporation
- boiler efficiency.
Q23 | It is required to produce large amount of steam at low pressure. Which boiler should be used ?
- pulverised fuel fired boiler
- cochran boiler
- lancashire boiler
- babcock and wilcox boiler
Q24 | Size of boiler tubes is specified by
- mean diameter and thickness
- inside diameter and thickness
- outside diameter and thickness
- outside diameter and inside diameter
Q25 | The heat loss in a boiler takes place in the form of
- heat carried away by flue gases
- heat carried away by ash
- radiation
- all of the above.