### Two Phase System Set 2

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