TSEE MCQ part 5

31. If 10 % air is entrained in a steam system at 5 kg/cm2g then the saturation temperature of steam will be

a) Less than the saturation temperature at 5 kg/cm2g

b) More than the saturation temperature at 5 kg/cm2g

c) Equal to the saturation temperature at 5 kg/cm2g

d) Equal to the saturation temperature at 5.5 kg/cm2g

Answer A

 

32. In a pressure reduction valve, which of these does not change?

a) Temperature b) Pressure

c) Velocity d) Enthalpy

Answer D

 

33. Steam at 6 bar has a sensible heat of 159.33 kcal/kg and latent heat of 498.59 kcal/kg.

If the steam is 95 % dry then the total enthalpy is

a) 625 kCal/kg b) 649.95 kCal/kg

c) 553 kCal/kg d) 633 kCal/kg

Answer D

 

34. Select the wrong statement with respect to steam traps

a) Discharges condensate as soon as it is formed

b) Does not allow steam to escape

c) Capable of discharging air and other incondensable gases

d) Does not allow condensate to escape

Answer D

35. Velocity of steam in steam pipe is directly proportional to _______________

a) Number of bends in pipe b) Specific volume of steam

c) Length of pipe d) Diameter of the pipe

Answer B

 

36. In a typical industrial steam distribution, the commonly used trap for main steam pipe lines is

a) Thermostatic trap b) Inverted bucket trap

c) Thermodynamic trap d) Open bucket trap

Answer C

 

37. For same inlet conditions of the steam, which of the following will generate the maximum mechanical power ?

a) Condensing turbine b) Back pressure turbine

c) Extraction-cum-condensing turbine d) Extraction-cum-back pressure turbine

Answer A

 

38. In an oil fired heat treatment furnace, which of the following is not required to determine its efficiency by direct method ?

a) Weight of input material b) Oxygen percentage in flue gas

c) Fuel consumption d) Calorific value of fuel

Answer B

 

39. In a coke fired cupola, carbon monoxide is produced in the

a) Preheating zone b) Reducing zone

c) Combustion zone d) Melting zone

Answer B

 

40. Tuyeres is a part of the equipment associated with

a) Induction furnace b) Re-heating furnace

c) Electrical melting arc furnace d) Cupola

Answer D