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