Emerging Trends in Mechanical Engineering

Pages – 1/2/3/4/5/6/7

Chapter 2: Process Engineering

2.1 Process Boilers

1   A boiler is a device used to create steam by applying __________to water
    (A)   Light energy
    (B)   Heat energy
    (C)   Wind energy
    (D)   Mechanical energy

2   Process boiler is a type of boiler with a capacity of ____________Buts per hour
    (A)   200,000
    (B)   300,000
    (C)   400,000
    (D)   50,000

3   _________is the most widely used media in distribution of heat over distance in industries
    (A)   Steam
    (B)   Light
    (C)   Springs
    (D)   Water

4   The temperature and pressure in saturated stem has —— relationship
    (A)   Direct
    (B)   Indirect
    (C)   Neither of above
    (D)   Both a and b

5   What should be the temperature of feed water?
    (A)   12°C
    (B)   80°C
    (C)   50°C
    (D)   None of above

6   For caring the heat efficiently the steam must be__________
    (A)   Dry
    (B)   Wet
    (C)   Saturated
    (D)   None of above

7   _____________is used to release condensate in pipe work
    (A)   Steam trap
    (B)   valves
    (C)   Power generators
    (D)   none of above

8   Water tube boilers are those in which
    (A)   Flue gases pass through tubes and water around it
    (B)   Water passes through the tubes and flue gases around it
    (C)   Work is done during adiabatic expansion
    (D)   Change is enthalpy

9   Fire tube boilers are those in which
    (A)   Flue gases pass through tubes and water around it
    (B)   Water passes through the tubes and flue gases around it
    (C)   Work is done during adiabatic expansion
    (D)   Change is enthalpy

10   Size of boiler tubes is specified by
    (A)   Mean diameter and thickness
    (B)   Inside diameter and thickness
    (C)   Outside diameter and thickness
    (D)   Outside diameter and inside diameter

11   Cochran boiler is a
    (A)   Horizontal fire tube boiler
    (B)   Horizontal water tube boiler
    (C)   Vertical water tube type
    (D)   Vertical fire tube type

12   Locomotive boiler has
    (A)   137 fire tubes and 44 superheated tubes
    (B)   147 fire tubes and 34 superheated tubes
    (C)   157 fire tubes and 24 superheated tubes
    (D)   167 fire tubes and 14 superheated tubes

13   Water tube boilers produces steam at a________ pressure than that of fire tube boilers.
    (A)   Higher
    (B)   Lower
    (C)   Same
    (D)   None of the above

14   The biggest loss in the boiler is
    (A)   Moisture in fuel
    (B)   Dry flue gases
    (C)   Steam formation
    (D)   Un-burnt carbon

15   The draught in locomotive boilers is produced by a ___________
    (A)   Chimney
    (B)   Centrifugal fan
    (C)   Steam jet
    (D)   All of the above

16   The draught may be produced by a_________
    (A)   Chimney
    (B)   Mechanical fan
    (C)   Steam jet
    (D)   All of the above

17   The efficiency of the plant _____ with the mechanical draught
    (A)   Increases
    (B)   Decreases
    (C)   Remain constant
    (D)   None of the above

18   Which of the following boiler is best suited to meet the fluctuating demand of steam——?
    (A)   Locomotive boiler.
    (B)   Lancashire boiler
    (C)   Cornish boiler
    (D)   Babcock and Wilcox boiler

19   Which of the following is a water tube boiler——?
    (A)   Locomotive boiler
    (B)   Lancashire boiler
    (C)   Cornish boiler
    (D)   Babcock and Wilcox boiler

20   The economizer is used in boilers to……..
    (A)   Increase thermal efficiency of boiler
    (B)   Economize on fuel
    (C)   Extract heat from the exhaust the gases
    (D)   Increase flue gas temperature

21   An economizer in a boiler……..
    (A)   Increases steam pressure.
    (B)   Increases steam flow
    (C)   Decreases fuel consumption
    (D)   Decreases steam pressure

22   In a condensation process, _______ to _________
    (A)   Gas, Solid
    (B)   Gas, Liquid
    (C)   Liquid, Gas
    (D)   Liquid, Solid

23   When vapor is compressed isothermally the ____________ changes.
    (A)   Volume.
    (B)   Pressure
    (C)   Temperature
    (D)   None of the mentioned

24   Condensation starts ________ point.
    (A)   Dew point
    (B)   Bubble point
    (C)   Triple point
    (D)   None of the mentioned

25   When gas changes to liquid through the process of condensation, the temperature
    (A)   Increases.
    (B)   Decreases
    (C)   Remains constant.
    (D)   None of the mentioned

26   When vapor is cooled at constant total system volume, the _______ changes.
    (A)   Volume.
    (B)   Pressure
    (C)   Temperature.
    (D)   None of the mentioned

27   Which of the following boiler is best suited to meet the fluctuating demand of steam —–
    (A)   Locomotive boiler.
    (B)   Lancashire boiler
    (C)   Cornish boiler
    (D)   Babcock and Wilcox boiler

28   Boiler efficiency is a measure of how effectively _______ energy in fuel is converted into heat energy in steam going to the turbines
    (A)   Chemical energy
    (B)   Heat energy
    (C)   Thermal energy
    (D)   All of the above

29   The water tubes in a simple vertical boiler are _______
    (A)   Horizontal
    (B)   Vertical
    (C)   Inclined
    (D)   All of the above

30   The diameter of fine tubes in Cochran boiler is of order of _______
    (A)   2cm
    (B)   6cm
    (C)   8cm
    (D)   15cm

31   The diameter of internal flue tubes of a Lancashire boiler is about _______ that of its shell
    (A)   One fourth
    (B)   One third
    (C)   Two fifth
    (D)   One half

32   Thermal of well-maintained boiler will be of the order ______
    (A)   30%
    (B)   55%
    (C)   90%
    (D)   45%

33   What is the temperature at which the steam boiler is capable to withstand?
    (A)   200°C
    (B)   280°C
    (C)   540°C
    (D)   358°C

34   Where are steam boilers used in the industries?
    (A)   Heating requirement for facility
    (B)   Steam for batching
    (C)   Steam for processing
    (D)   all of the above

35   Which of the following is not a part of a boiler?
    (A)   burner the combination
    (B)   Chamber
    (C)   Water reservoir
    (D)   None above

36   The heat in the boiler is used for making ______
    (A)   Steam
    (B)   Condensing process
    (C)   Ice
    (D)   None of these

37   How many cooling towers are there near a reactor?
    (A)   1
    (B)   4
    (C)   5
    (D)   2

38   Cooling Towers vary from size of 40 meters to
    (A)   400
    (B)   120
    (C)   450
    (D)   560

39   What is the main component in a boiler?
    (A)   Steam
    (B)   Heat
    (C)   Pressure condenser
    (D)   Combination

40   Which cooling Towers use a process similar to the one found in small evaporation active cooling units
    (A)   Hyperbolic
    (B)   Tower
    (C)   Condensate loop
    (D)   None of these

41   What is the reason to service a cooling tower?
    (A)   To ensure proper air flow
    (B)   To clean the tubes
    (C)   To inspect the water pump
    (D)   all of these

42   A __________ is a type of heat exchange system where water is heated to its’ boiling point via combustion of a fuel blown through a tube submerged in water.
    (A)   Condensate loop
    (B)   Hyperbolic cooling tower
    (C)   Steam boiler
    (D)   All of above

43   The heat produced in this system is then rejected into the system as _______
    (A)   Steam
    (B)   Boiler
    (C)   Both a & b
    (D)   None

44   A ________ incorporates a firebox or furnace in order to burn the fuel and _________ heat.
    (A)   Boiler, generate
    (B)   Heat, boiler
    (C)   Steam, pressure
    (D)   None

45   A boiler is an enclosed vessel that provides a means for ________ and ______ heat to water until it becomes hot water or steam.
    (A)   Generate, boiler
    (B)   Condenser, loop
    (C)   Combustion, transfers
    (D)   All of above

46   Steam produced in a boiler can be used for a variety of purposes including space heating, drying and _________________
    (A)   Sterilization
    (B)   Humidification
    (C)   Power generation
    (D)   All of above

47   The _______ system includes anywhere that the steam condenses to form liquid water.
    (A)   Loop
    (B)   Power
    (C)   Liquid
    (D)   Condensate

48   The back pressure created by lift is approximately ______PSIG for every 2 feet of condensate lift.
    (A)   1 PSIG
    (B)   3PSIG
    (C)   1PSGI
    (D)   3PSGI

49   Condensate is the liquid formed when steam passes from the ________ to the ______ state.
    (A)   Vapor, solid
    (B)   Solid, liquid
    (C)   Vapor, liquid
    (D)   None

50   A _______ incorporates a firebox or furnace in order to burn the fuel and generate heat.
    (A)   Steam
    (B)   Boiler
    (C)   Hydrogen
    (D)   None

51   The generated heat is transferred to water to make ______ the process of boiling.
    (A)   Steam
    (B)   Boiler
    (C)   Both
    (D)   None

52   Steam is regularly used for propulsion (as a driving force) in applications such as ________ turbines.
    (A)   Gas turbine
    (B)   Steam turbine
    (C)   Water turbine
    (D)   Option: B

53   Heating Requirement for Facility.
    (A)   Steam for Batching.
    (B)   Steam for Processing.
    (C)   All of the above

54   Industrial boilers are closed vessels that use a fuel source or electricity to generate ________for industrial purposes.
    (A)   Fuel
    (B)   Food
    (C)   Steam

55   Basic Parts of a Boiler.
    (A)   Burner,
    (B)   The combustion chamber,
    (C)   The heat exchanger
    (D)   All of the above

56   Boiler water pH refers to a quantitative figure that expresses the acidity or alkalinity of boiler water. Ideally it should be between
    (A)   8.5 to 9.5
    (B)   7.5 to 8.5
    (C)   9.5 to 10.5

57   Steam Properties and Qualities:
    (A)   They are capable of dividing and renewing themselves for long periods
    (B)   They are unspecialized
    (C)   They can give rise to specialized cell types.
    (D)   All of above

58   On Mollier chart, free expansion or throttling process from High pressure to atmosphere is represented by
    (A)   Horizontal straight line
    (B)   Vertical straight line
    (C)   Straight inclined line
    (D)   Curved line

59   What is the function of boiler?
    (A)   To burn the fuel in a confined closed system with the supply of air
    (B)   To generate steam in varying pressure
    (C)   To generate steam at constant pressure
    (D)   To produce flue gases by burning fuel at a given pressure

60   What increase as steam pressure increase inside a boiler?
    (A)   Force
    (B)   Density
    (C)   Rate of steam conversion
    (D)   Viscosity

61   In what is water in high pressure boiler circulated through?
    (A)   Conduits
    (B)   Cove
    (C)   Channel
    (D)   Tubes

62   Why single boiler unit per turbine is equipped commonly?
    (A)   For better turbine control
    (B)   To reduce the cost
    (C)   For overcoming losses of power
    (D)   To improve the efficiency

63   Cornish boiler is an example of which types of boiler?
    (A)   Fire tube boiler
    (B)   Water tube boiler
    (C)   Vertical tube boiler
    (D)   externally fired boiler

64   Which of these is a stationary boiler?
    (A)   Locomotive boiler
    (B)   Marine boiler
    (C)   Mobile boiler
    (D)   Babcock Wilcox boiler

65   What is the steam pressure limit of natural circulation Boiler?
    (A)   650 bar
    (B)   180 bar
    (C)   400 bar
    (D)   550 bar

66   A device known as a _______ is used to release condensate from the pipe work whilst preventing the steam from escaping from the system.
    (A)   Steam traps
    (B)   Steam pipes
    (C)   Boiler nose
    (D)   Release valve

67   Which of these is a ‘fissile fuel’?
    (A)   Thorium
    (B)   Carbon
    (C)   Potassium
    (D)   Graphite

68   What kind of energy output is obtained from a ‘Steam Power Plant’?
    (A)   Heat energy
    (B)   Sound energy
    (C)   Electricity
    (D)   Thermal energy

69   Water that is fed back to the boiler by the pump is called?
    (A)   Absorber
    (B)   Absolute
    (C)   Compressor
    (D)   Condensate

70   Which of these is an output of a ‘Furnace’?
    (A)   Fuel gas
    (B)   Cool Air
    (C)   Flue gases
    (D)   Water Vapor

71   The product of efficiency & heat transferred to the working fluid is?
    (A)   Net temperature change
    (B)   Net work done
    (C)   Net enthalpy change
    (D)   None of the mentioned

72   Rankine cycle efficiency in a good steam power station may be in the range between……..
    (A)   15% – 20%
    (B)   35% – 40%
    (C)   50% – 60%
    (D)   90% – 95%

73   The following is the correct order of energy conversion in thermal power plants
    (A)   Chemical energy – Mechanical energy – Electrical energy
    (B)   Mechanical energy – Chemical energy – Electrical energy
    (C)   Wind energy – Mechanical energy – Electrical energy
    (D)   Heat energy – Electrical energy – Mechanical energy.

74   Feed water usually at…… °C temperature.
    (A)   70
    (B)   120
    (C)   1000
    (D)   80

75   If the water level inside the boiler were not carefully control cased…
    (A)   explosion
    (B)   overheat and fail
    (C)   both a) & b)
    (D)   None of above

76   When steam is condensate volume is drastically…….
    (A)   Reduces
    (B)   increase
    (C)   Both a) & b)
    (D)   None of above

77   Following image shows part of………
    (A)   Compressor
    (B)   separator
    (C)   Steam tube
    (D)   boiler shell

78   Direct relation between…….. &………of saturated steam, the amount of energy input to process easy to control.
    (A)   Volume, pressure
    (B)   volume, temperature
    (C)   Temperature, pressure
    (D)   none of above

79   …… is excellent carrier of heat
    (A)   Water
    (B)   steam
    (C)   Solid
    (D)   None of above

80   A steam and condensate system represents a _____ loop.
    (A)   Discontinuous
    (B)   Continuous
    (C)   None of the above
    (D)   All of the above

81   Once the condensate reaches the _____, it becomes available to the boiler for recycling.
    (A)   Condenser
    (B)   Turbine
    (C)   Boiler
    (D)   Generator

82   A boiler or steam generator is a device used to create steam by applying heat energy to _____.
    (A)   Water
    (B)   Petrol
    (C)   Oil
    (D)   All of the above

83   Which of the following is not a type of boiler?
    (A)   Fire tube boiler
    (B)   Water tube boiler
    (C)   Cast iron boiler
    (D)   Hot water boiler

84   Which of the following is the combustion accessory of a boiler?
    (A)   Fuel oil system
    (B)   Gas system
    (C)   Coal system
    (D)   All of the above

85   Find the wrong statement.
    (A)   Boiler is used to produce electricity in the energy business.
    (B)   Boiler is used to produce steam for generating electricity.
    (C)   Boiler can pressurize the water and can also evaporate it.
    (D)   All are wrong.

86   When the bubbles of steam are produced?
    (A)   Once the water reaches saturation temperature
    (B)   Once the water starts evaporating
    (C)   Once the temperature decreases
    (D)   None of the above

87   If steam is pressurized _____
    (A)   It occupies more space
    (B)   It occupies less space
    (C)   Both are correct
    (D)   None of the above

88   Combustion air positive shut-off shall be provided on all newly installed _______
    (A)   Grant boilers
    (B)   Process boilers
    (C)   Worcester boilers
    (D)   All of the above

89   Process boilers with capacity of 2.5 MMBtu/h and above are also referred as _
    (A)   Natural draft boilers
    (B)   Atmospheric boilers
    (C)   Both a. And b.
    (D)   None of the above

90   A flue damper and a vent damper are two examples of _______
    (A)   Combustion air positive shut off devices
    (B)   Combustion air negative shut off devices
    (C)   Both a. & b.
    (D)   None of the above

91   For process boilers, combustion air fans must meet the following requirements ___
    (A)   The fan motor shall be driven by a variable speed drive
    (B)   The fan motor shall include controls that limit the fan motor demand to no more than
    (C)   30 %.
    (D)   Both a. & b.

92   Use of ______ is prohibited in process boilers.
    (A)   Use of a common gas
    (B)   combustion air control linkage
    (C)   jack shaft
    (D)   All of the above

93   Oxygen trim control strategy __
    (A)   continuously measures the oxygen content in the flue gas
    (B)   adjusts the combustion air flow
    (C)   Continually tuning the air-fuel mixture.
    (D)   All of above

94   It is easy to detect and monitor excess air
    (A)   As oxygen not used for combustion is heated and discharged with the exhaust gases.
    (B)   Oxygen is discharged without heating
    (C)   Both a. & b.
    (D)   None of above

95   Detecting and monitoring carbon monoxide assures the air/fuel ratio is not too rich as
    (A)   The excess air is trimmed
    (B)   Excess air is let out
    (C)   Both a. & b.
    (D)   None of above

96   Based on the exhaust gas analysis, a controller maintains stoichiometric combustion __
    (A)   by commanding a servo motor to adjust the combustion air damper
    (B)   By commanding servo motor to adjust the fuel supply valve.
    (C)   Both a. & b.
    (D)   None of the above.

97   Combustion is the ideal air/fuel ratio where
    (A)   the mixing proportion is correct,
    (B)   the fuel is completely burned
    (C)   the oxygen is entirely consumed
    (D)   All of the above

98   Green coal, in order to be burnt, must be
    (A)   Heated sufficiently
    (B)   Burnt in excess air
    (C)   Heated to its ignition point
    (D)   Burnt as powder

99   A safety valve usually employed with stationary boilers is
    (A)   Lever safety valve
    (B)   Dead weight safety valve
    (C)   High steam and low water safety valve
    (D)   All of these

100   The relative heat absorption for successively added equal areas of boiler convection heating surfaces__________
    (A)   Increases
    (B)   Decreases
    (C)   Remain unaffected
    (D)   First increases and then decreases

Pages – 1/2/3/4/5/6/7

Back to Top