TSEE MCQ part 6

41. An increase in bulk density of a refractory increases its

a) Thermal conductivity b) Heat capacity

c) Resistance to slag penetration d) All of the above

Answer D

 

42. The storage heat losses in a batch type furnace can be best reduced by

a) Fire Clay brick b) Ceramic fibre

c) High alumina brick d) High silica brick.

Answer B

 

43. Emissivity is a measure of material’s ability to

a) Only absorb heat b) Only radiate heat

c) Absorb and radiate heat d) None of the above

Answer C

 

44. Which of the following depends on physical properties of fluids as well as geometry of the heat exchanger ?

a) Overall heat transfer coefficient b) Fouling coefficient

c) LMTD d) Effectiveness

Answer A

 

45. The waste heat boiler application is not suitable for which of the following?

a) Gas turbine b) Diesel engine

c) Oil fired furnaces d) Hot air dryers

Answer D

 

46. Moisture content in coal

a) Increases heat loss due to evaporation and superheating of water vapour

b) Helps in binding fines

c) Aids in radiation heat transfer

d) All of the above

Answer D

 

47. With respect to properties of steam

a) The sensible heat decreases as the pressure increases

b) The latent heat increases as the pressure increases

c) The specific volume increases as the pressure increases

d) The specific volume decreases as the pressure increases

Answer D

 

48. Oxidation of carbon to CO2 yields 8084 kcal/kg of carbon. Oxidation of carbon to CO in the flue gas yields 2430 kcal/kg of carbon. Oxidation of CO to CO2 will yield

a) 5654 kCal b) 5800 kCal

c) 5464 kCal d) 540 kCal

Answer A

 

49. The maximum loss that takes place in a fully condensing steam turbine power plant is

a) Flue gas loss b) Steam distribution loss

c) Radiation and insulation loss d) Condenser losses

Answer D

 

50. The difference between mean solid and mean gas velocity in FBC boiler is called

a) Fluidization factor b) Slip velocity

c) Settling velocity d) Terminal velocity

Answer B