| Post Name | Boiler Attendant - Pharmaceutical Corporation Kerala Ltd |
|---|---|
| Question Paper Code | 104/2023/OL |
| Category Code | 156/2022 |
| Date of Test | 4 July 2023 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
If a pure substance in the gaseous phase is to be liquefied, it must first be cooled below the
Answer
B. critical state
2
In Mollier diagram, Isobars
Answer
C. diverge from one another
3
The density difference between saturated liquid and saturated vapor is _______ at critical state.
Answer
B. Zero
4
Which of the following is the equation for heat of superheated steam?
Answer
A. h_sup=h_f+h_fg+C_ps log_e(T_sup/T_s)
5
The throttling calorimeter is used for measuring
Answer
C. very high dryness fraction upto 0.98
6
Entropy of 1 kg of wet steam is given by
Answer
A. s_f+xh_fg/T_s
7
A rigid vessel with a volume of contains a water vapor mixture at 400 kPa at 60 percent quality. The pressure is lowered to 300 kPa by colling the vessel. Find mass of gas (mg) at state 2.
Answer
A. 16.5 kg
8
The point that connects saturated-liquid line to saturated vapor line is called
Answer
A. Triple point
9
The specific volume of water at 200°C and at 80 percent quality
Answer
C. 0.1 /kg
10
Two kilograms of steam are contained in a piston cylinder arrangement. The 20 mm diameter 40 kg piston is allowed to rise with no friction until the temperature reaches 260ºC. The final volume is
Answer
B. 0.29
11
The reading of pressure gauge fitted on a vessel is 25 bar. The atmospheric pressures is 1.03 bar and the value of g is 9.81 m/ The absolute pressure in the vessel is
Answer
C. 26.03 bar
12
The standard atmospheric pressure is 762 mm of Hg. At a specific location, barometer reads 700 m of Hg. At this place, what does an absolute pressure at 380 mm of Hg corresponds to
Answer
A. 320 mm of Hg vacuum
13
Where can a piezometer be not used for pressure measurement in pipes?
Answer
C. The fluid in the pipe is as gas
14
Elastic elements used for measurement of force give
Answer
B. low sensitivity and fast response if they are stiff
15
Electromagnetic type of balances
Answer
B. give an output which can be used for display, recording and control
16
Purely mechanical instruments cannot be used for dynamic measurements because they have
Answer
D. all the above
17
The temperature range in which radiation Pyrometers are used
Answer
D. 1200 - 2500ºC
18
The temperature probes for high-speed flows measure
Answer
C. recovery temperature
19
The property desirable for a manometric fluid is
Answer
C. low vapor pressure
20
The bulb and capillary of a pressure thermometer using mercury is made up of
Answer
A. stainless steel
21
The safety regulations followed by boilers in India
Answer
D. IBR
22
In the event that the water level goes below the safe level, which of the following fittings is used to extinguish the boiler furnace fire?
Answer
C. fusible plug
23
The external inspection of a boiler ensures
Answer
B. the valves are in good operating condition
24
The operation for opening up a boiler into a pressured steam header is referred to as "cutting" the boiler into the header according to which ASME code?
Answer
D. ASME Section VII
25
It is beneficial to _______ before removing a boiler from service for maintenance purposes
Answer
B. use soot blowers and clean the fireside well
26
Statement 1 - Sudden surging/spouting of water into the outlet of the boiler is called priming Statement 2 - Tiny bubbles forming inside a steam boiler is known as carry over. Which of the above are true?
Answer
A. Statement 1
27
Out of the following what are the possible causes for priming. 1. Too high level of water 2. Uneven fire distribution 3. Load surging
Answer
B. All of the above
28
Out of the following, which are the disadvantages of reverse osmosis feed water treatment 1. not fit for high pressure operations 2. chances of biofouling 3. short cleaning intervals 4. does not reject all solids
Answer
D. 1 and 2
29
Statement 1 - Turbidimeter is used to measure sulfate content in water Statement 2 - In a Turbidimeter, Barium chloride is added to form barium sulphate crystals of uniform size Which of the above is true regarding a turbidimeter?
Answer
A. both are correct
30
Out of the following, what are the preferred values for a boiler feed water 1. PH above 11 2. Alkalinity between 300 and 500 ppm 3. Chlorides between 60 and 100 ppm 4. Total dissolved solids 10 ppm.
Answer
B. 1, 2 and 3
31
Which of the following statements related to boiler feed water alkalinity is true? Statement 1 - Excess alkalinity causes caustic embrittlement Statement 2 - Alkalinity needs to be high enough to prevent corrision
Answer
A. Both are correct
32
Statement 1 - Conductivity can be used to measure amount of total dissolved solids in feed water Statement 2 - Purity of steam leaving the boiler can be measured by measuring conductivity of steam Which of the above statements is correct?
Answer
C. Statement 1 and 2
33
Statement 1 - Phosphate treatment is to reduce Calcium of low hardness water. Statement 2 - Continuous blowdown in a boiler differs from intermittent blowdown by keeping concentration levels constant Which of the above is correct?
Answer
C. both are correct
34
In a Steam boiler, losses are in the order of (low to high)
Answer
A. Shell losses, Blowdown, Flue gases
35
Statement 1 - Scaling is the result of deposition of Calcium and Magnesium into carbonates at higher temperatures Statement 2 - Corrosion is mainly due to dissolved oxygen and partly by carbon dioxide formed by decomposition of carbonates at high temperature Which of the above statements is correct?
Answer
B. both are correct
36
Statement 1 - An automatic blowdown system works by sensing anything that adds conductivity like Calcium, Magnesium, Sodium etc. Statement 2 - Ammonia is known to increase yellow metal corrosion. Which of the above statement are true?
Answer
D. both are correct
37
Statement 1 - Incomplete oxygen removal from feed water causes economiser failure due to pitting Statement 2 - Deaerator and feedwater tank operates on the basis of increased solubility of dissolved gases at increased temperatures Which of the above statements are true
Answer
C. Only statement 1
38
Statement 1 - Lever safety valves can be adjusted for different operating pressures Statement 2 - In a Lever safety valve, operating pressure is set by shifting the weight arm (position) on the lever. Which of the above is correct regarding the operation of a boiler?
Answer
D. Both are correct
39
Statement 1 - High steam and low water level safety valve can be used as a pressure regulator as well as water level indicator Statement 2 - High steam and low water level valve makes different sounds (whistles) for low water level and high pressure Which of the above is correct regarding the operation of a boiler?
Answer
D. both are correct
40
In the super heater section of a boiler which combination of following heating methods is used? 1. inductive 2. radiative 3. convective 4. conductive
Answer
B. 2 and 3
41
Statement 1 - In a boiler, steam trap is used to reduce sediments and impurities Statement 2 - In a boiler, blow off cock is used to reduce condensate accumulation. Which of the above is correct regarding the operation of a boiler?
Answer
C. Both are incorrect
42
Assertion - All high pressure boilers are water tube boilers Reason - In water tube boiler are high pressure steam passes through small diameter tubes, 'Hoop stresses' developed is minimum Which of the above is true regarding the working of a high pressures boiler?
Answer
A. Assertions and reasons are true. Reason is correct explanation for Assertion
43
Which of the following are true regarding the operation of a Benson boiler? 1. It is a fire tube boiler 2. It works close to the critical point of water 3. It is known as drumless boiler 4. It has severe maintenance issues
Answer
A. 2, 3 and 4
44
What is the preferred conductivity value for boiler feed water in micro siemens per meter?
Answer
D. less than 5.0
45
Which of the following is correct regarding the operation of a La Mont boiler 1. It can produce 170 bar steam at 50 tonne per hour rate 2. It is a supercritical boiler 3. It uses forced circulation of water
Answer
B. 1 and 3
46
Which of the following is correct regarding the operation of a Boiler? 1. Fusible plug is generally used in fire tube boilers at protection devices 2. Fire tube boiler has higher efficiency than a water tube boiler for same steam conditions 3. Boiler accessories are used to improve efficiency of boilers
Answer
A. 1 and 3
47
Which of the following is true regarding the working of boilers? 1. Cochran boiler is a vertical boiler 2. Babcox Wicox boiler is a water tube boiler 3. Stirling boiler can produce steam at much higher pressure than a Lancashire boiler
Answer
B. All of above
48
Which of the following is correct regarding a stirling boiler? 1. In a stirling boiler steam drums and water drums are connected by steel tubes. 2. In a stirling boiler equalizers are used to equalise pressure in steam drums
Answer
B. 2 only
49
Which of the following is correct regarding a steam locomotive? 1. It has no stacks 2. It is a horizontal boiler 3. It is extrernally fired 4. It is a water tube boiler 5. It is a fire tube boiler with a single tube for flue gas 6. It is a fire tube with many tubes for flue gas
Answer
D. 2, 3 and 6
50
Which of the following is not a boiler mounting?
Answer
D. Feed pump
51
The device which used to put-off the fire in the boiler furnace when the level of water falls to an unsafe limit
Answer
A. Fusible plug
52
Which of the type of safety valve is mainly used for marine and locomotive boilers?
Answer
B. Spring loaded safety valve
53
A device, which is used to recover the waste heat of the flue gas for heating feed water
Answer
C. Economiser
54
The function of an injector in a steam boiler is to
Answer
B. Deliver cold water to boiler against its own pressure
55
Pressure gauge in a boiler is used to indicate the pressure of
Answer
D. Steam
56
The shape of manhole door in a boiler is
Answer
D. Elliptical
57
A feed check valve is a
Answer
C. Non-return valve
58
The mounting at the bottom of the boiler to discharge the accumulated mud, scale or sediments is
Answer
B. Blow off cock
59
The auxiliary parts or plants required for steam boilers for their proper operation and to increased efficiency is called
Answer
C. Boiler accessories
60
Fusible plug for boiler is made with
Answer
D. Gun metal
61
The number of water level indicators generally fitted on a boiler is
Answer
B. Two
62
The function of superheater is to
Answer
A. Increase the temperature of saturated steam
63
Boiler draught is broadly classified into
Answer
C. Natural draught and artificial draught
64
Choose the wrong statement about natural draught
Answer
A. Higher efficiency than artificial draught
65
In natural draught , the efficiency of chimney is approximately
Answer
D. 0.25%
66
Draught produced by a blower is installed near the base of the chimney is
Answer
C. Induced draught
67
The draught produced by steel chimney as compared to that produced by brick chimney for the same height is
Answer
B. More
68
The type of draught produced for locomotives by
Answer
B. Steam jet
69
Which is the correct statement about induced draught
Answer
A. The pressure inside the furnace is below the atmospheric pressure
70
The draught produced by means of a chimney is called
Answer
C. Natural draught
71
The power P required in Watts to drive the induced draught fan is given by
Answer
A. hmMT/(60×36×η)
72
Artificial draught is produced by
Answer
D. Blower and steam jet
73
The amount of water evaporated from saturated liquid water at 100°C to dry saturated steam at 100ºC is called
Answer
C. Equivalent evaporation
74
The efficiency of a boiler is defined as
Answer
B. The ration of heat actually utilised in generation of steam to the heat supplied by the fuel in the same time
75
The main object of a boiler trial is
Answer
D. All of the above
76
If h is the total heat of the steam in kJ/kg and h_f is the sensible heat of feed water in kJ/kg, the factor of evaporation is
Answer
B. (h−h_f)/2257
77
In a well maintained boiler, heat loss is maximum
Answer
D. Flue gases exhausted through chimney
78
A ______________ shows the complete account of heat supplied by 1 kg of dry fuel and heat consumed
Answer
C. Heat balance sheet
79
Which of the following loss cannot be fond direct method and is calculated by substracting the heat utilised in rising steam and heat loss from the heat supplied?
Answer
B. Heat loss due to radiation
80
The performance of a steam boiler is measured in terms of its
Answer
C. Evaportive capacity
81
Coke is produced by
Answer
B. bituminous coal is heated strongly in the absence of air for 48 hours
82
Which of the following has the highest calorific value?
Answer
D. Anthracite coal
83
Which of the following varieties of coal is mostly used in steam boilers?
Answer
B. Non-caking Bituminous coal
84
A good fuel is one which has
Answer
C. low ignition point and high calorific value
85
Calorific value of gaseous fuel is expressed in
Answer
D. kJ/
86
Producer gas is obtained by
Answer
A. partial combustion of coal, coke and charcoal in a mixed air stream
87
Calorific value of liquid fuel is the amount of heat liberated
Answer
C. By complete combustion of 1 kg of fuel
88
Bomb calorimeter is used to determine
Answer
A. higher calorific value of solid and liquid fuels at high pressure
89
To calculate net calorific value, product of combustion are
Answer
B. allowed to escape
90
Which of the following gas has highest calorific value
Answer
B. coal gas
91
One kg of carbon requires kg of oxygen and produces
Answer
D. kg of carbon monoxide gas
92
Mass of dry flue gas per kg of fuel burnt is the ratio of
Answer
D. Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas
93
Mass of excess air supplied is equal to
Answer
A. × Mass of excess oxygen
94
Orsat apparatus is used for
Answer
B. Volumetric analysis of dry flue gas
95
The three "Ts" for good combustion are
Answer
A. Temperature, time and turbulence
96
Kelvin-Planck's law deals with
Answer
C. Conversion of heat into work
97
Heat transfer takes place according to which of the following law?
Answer
D. Second law of thermodynamics
98
The mass of carbon present in 1 kg of flue gas is given by
Answer
D. 3/11 CO₂ + 3/7 CO
99
When one kg of solid or liquid fuel, containing C, H₂, O₂, S
Answer
B. 100/23[(8/3 C+8H₂+S)−O₂] kg
100
Air contains by volume
Answer
B. 21 parts and 79 Parts
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