| Post Name | Technician Grade-II (Boiler Operator) - Kerala Co-operative Milk Marketing Federation Ltd |
|---|---|
| Question Paper Code | 057/2022 |
| Category Code | 101/2020, 102/2020 |
| Date of Test | 21 May 2022 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Convert 0.1N to dynes
Answer
A. 10000
2
The unit which is not derived is
Answer
C. Candela
3
Which of the following conversion takes place in bourdon tubes?
Answer
B. Pressure to displacement
4
Which of the following is a non-contact type thermometer?
Answer
D. Optical Pyrometer
5
Which of the following is correct?
Answer
C. Gauge pressure = Absolute pressure – atmospheric pressure
6
Which one of the following is not the unit of energy?
Answer
C. Kilowatt
7
Calorie is a measure of
Answer
A. Quantity of Heat
8
The vacuum pressure is always the negative gauge pressure
Answer
B. Yes
9
Weight of the body in Newtons (N) is
Answer
B. kg m/s2
10
Each question is provided with four choices
Answer
D. having one correct answer. Choose
the correct answer and darken the bubble corresponding to the question number using Blue or
Black Ball Point Pen in the OMR Answer Sheet.
11
If 0.8 and 0.9 are the dryness fraction obtained in separating calorimeter and throttling
calorimeter respectively, then in combined separated and throttling calorimeter the
actual dryness fraction of steam is
Answer
B. 0.72
12
Triple point temperature and pressure for water are
Answer
C. 0.01°C and 0.6108 kPa
13
Specific volume of wet steam with dryness fraction x is
Answer
A. x vg
14
Steam coming out of the whistle of pressure cooker is
Answer
D. Wet steam
15
The properties of water and steam become identical at
Answer
B. 2.122 × 107 Pa
16
Calculate the dryness fraction of steam which has 1 kg of water in suspension with
49 kg of steam
Answer
A. 0.98
17
Specific volume of water when heated at 273.15 K
Answer
C. First decreases and then increases
18
Heat of superheated steam is given by
Answer
A. h_sup = h_f + h_fg + c_ps logₑ(T_sup/T_s)
19
With increase in pressure the enthalpy of dry saturated steam
Answer
D. Decreases
20
Superheating of steam done at constant
Answer
D. Pressure
21
Nothing in this the Boilers Act 1923 shall apply to
Answer
D. all of the above
4 057/2022
22
The economizer can be operated after issue of
Answer
B. Form XI
23
For a boiler having outside diameter below 2 ft. 6 inches, the manhole or sight hole
size shall be
Answer
C. 9 inches × 7 inches
24
For feed water and boiler water, test methods shall be carried out as prescribed in the
appropriate clauses as shown below:
Answer
C. IS : 3025 - 1964 and IS : 3025 - 1965
25
The Chief Inspector and all Deputy Chief Inspectors and Inspectors shall be deemed
to be public servants within the meaning of ______ of the Indian Penal Code
(45 of 1860).
Answer
A. Section 21
26
Which of the following is an integral part of a boiler, which increases the efficiency of
the boiler?
Answer
B. Accessories
27
Which of the following statements is/are correct about a horizontal type boiler?
(i) It occupies more space
(ii) It can be inspected easily
(iii) It can be repaired easily
Answer
D. All of the above
28
A high pressure boiler is one which produces steam at a pressure of
Answer
B. 80 bar and above
29
Which of the following statements is/are correct about Babcock and Wilcox boiler?
(i) It is a horizontal fire tube boiler (ii) It is a horizontal water tube boiler
(iii) It is a natural circulation type boiler (iv) It is a forced circulation type boiler
Answer
B. Only (ii & iii)
30
Which of the following statements is/are correct about Stirling boiler?
(i) It is a water tube boiler
(ii) It is a bent tube boiler with steam drums and water drum.
(iii) It is a water tube boiler with straight tubes.
(iv) It is popular for large central power stations.
Answer
C. Only (i, ii & iv)
31
Match the following statements in Column 1 to that in Column 2
Column 1 Column 2
Answer
D. Single tube boiler (iv) Simple vertical boiler
32
Which of the following combinations represents boiler mountings?
Answer
D. Pressure gauges and water level gauges
33
Which of the following is not a horizontal boiler?
Answer
D. Cochran
34
Match the following statements in Column 1 to that in Column 2:
Column 1 Column 2
Answer
A. High Pressure boiler (i) Locomotive
35
For the same power, the shell diameter of fire tube boiler compared to that of water
tube boiler is
Answer
B. Larger
36
Which of the following statements is/are correct about the fire tube boilers?
(i) They are suitable for larger power plants
(ii) They can work under very high pressure as 100 bar
(iii) Requires less skill for efficient and economic working
(iv) Construction and transportation are difficult
Answer
C. Only (iii & iv)
37
Match the following boiler terms in Column 1 to that of their description in Column 2:
Column 1 Column 2
Answer
A. Foaming (i) Blocks of asbestos or magnesia
insulation wrapped on the outside of
boiler shell
38
Next to oxygen, the main cause of corrosion in boilers is
Answer
C. Carbon dioxide
39
Which of the following combinations represents mechanical methods of feed water
treatment in boilers?
Answer
B. Sedimentation and coagulation
40
The correct sequence which indicates the effect of scale formation in boiler is
Answer
C. Overheating → Blistering → Rupturing
41
Which of the following statements is/are correct regarding 'turbidity' in feed water?
(i) It indicates coarse particles which settle down in stationary water.
(ii) It is the suspended insoluble matter
Answer
B. Only (ii)
42
The formation of hard surfaces which resists the heat transfer and clogs the passages
in pipes of boiler is caused by
Answer
D. All of the above
43
Match the various types of feed water treatment methods in Column 1 to that in
Column 2
Column 1 Column 2
Answer
C. Chemical treatment (iii)
Uses a series of cation and anion
exchangers
44
Which of the following are the favourable conditions for corrosion in boilers?
Answer
A. Low pH, Dissolved O2 & CO2
45
Which of the following statements is/are correct about hot process phosphate
softening of feed water in boilers?
(i) It is a thermal method of treatment
(ii) It uses trisodium phosphate and caustic soda
(iii) It uses lime and soda ash
(iv) It is a chemical treatment
Answer
B. Only (ii & iv)
46
The corrosion in boilers can be controlled by
Answer
D. All of the above
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47
The favourable conditions for scale formation in boilers is/are
Answer
B. Decrease of solubility of salts with increase of temperature
48
Which of the following is/are correct about zeolites
Answer
B. They almost completely remove hardness of feed water
49
Water high in carbonates can be softened easily without replacing the water with
some other salts by
Answer
C. Zeolite processes
50
Which of the following statements regarding boiler mounting is true?
Answer
A. They ensure safe operation of the boiler
51
A lever safety valve used on steam boiler is
Answer
B. Maintaining constant safe pressure inside the steam boiler
52
In which type safety valve is used in a stationary boiler?
Answer
C. Dead weight safety valve
53
A device used to heat feed water by utilising the heat in the exhaust flue gases
Answer
C. Ecnomizer
54
In which type pressure gauges are generally used in steam boiler?
Answer
B. Bourdon type
55
In water level indicator how many water level devices are used?
Answer
C. 2
56
In which boiler mountings are used to protect the fire tube?
Answer
B. Fusible plug
57
Which of the following is not a boiler accessory?
Answer
A. Water level indicator
58
A super heater used in the steam boiler is
Answer
B. To increase the temperature of saturated steam
59
An air preheater is installed
Answer
C. Between the ecnomizer and chimney
60
Blow off cock is used in a boiler to
Answer
B. Remove impurities from the boiler
61
Which of the following boiler mountings prevents the back flow of the water after
pumping into the boiler?
Answer
A. Feed check valve
62
Which of the following relatively employs highest heat transfer surface in a high
pressure boiler?
Answer
D. Air preheater
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63
In a draught system fan is placed before the fire grate is called
Answer
C. Forced draught system
64
The efficiency of chimney is
Answer
B. less than one per cent
65
The velocity of flue gases V through a chimney under static draught H metres is
Answer
A. 4.43√H
66
Which type of draught system is used in the locomotives?
Answer
D. Induced steam draught system
67
The ratio of chimney height to the hot gas coloumn producing draught for the maximum
discharge of flue gas through chimney is
Answer
B. 1
68
In an induced steam jet draught system, the steam jet issuing from nozzle is placed in
Answer
B. Chimney
69
A draught produced by the chimney due to the difference of densities between the
hot gases inside the chimney and cold atmosphere air outside is called
Answer
B. Natural draught system
70
Which of the following statements is wrong?
Answer
B. The natural draught reduces the fuel consumption
71
For chimney height H and atmospheric temperature T₁, the draught pressure for maximum discharge is
Answer
B. 176.5H/T₁ mm of water
72
The boiler draught is
Answer
B. The difference of pressure is maintained above and below the fire grate
73
The factor of evaporation of boiler is
Answer
D. Greater than unity
74
When the enthalpy of steam is h KJ/Kg and the enthalpy of feed water is hf1KJ/Kg then
the factor of evaporation is given by
Answer
A. h – hf1 /2257
75
The performance of a steam boiler is measured in terms of its
Answer
D. Evaporative capacity
76
Heat balance sheet of a steam boiler shows
Answer
C. Complete account of heat supplied by 1 Kg of dry fuel and heat consumed
77
The main objectives of a boiler trial are:
Answer
B. To determine the generating capacity of the boiler
78
Boiler efficiency does not depend on
Answer
D. Operating time
79
The evaporative capacity of a steam boiler is expressed in
Answer
B. Kg/Kg of fuel burned
80
In a boiler various heat losses take place. The biggest loss is due to
Answer
B. Dry flue gases
81
Which of the following is a primary fuel?
Answer
A. Lignite coal
82
The most suitable solid fuel for steam generation is
Answer
D. Anthracite
83
By passing steam over incandescent coke can produce
Answer
B. Water gas
84
If the fuel contains oxygen then as per Dulong's formula it is assumed that the whole
amount is combined with hydrogen having mass equal to
Answer
B. (1/8) th of oxygen
85
LCV of a fuel can be found by subtracting heat of steam formed during combustion from HCV, where mass of steam formed in kg per kg of fuel equals
Answer
A. 9H₂
86
Bomb calorimeter can be used to find the calorific value of
Answer
C. Both liquid and solid fuels
87
Cover of the bomb calorimeter has
Answer
B. Two valves
88
Higher calorific value is for
Answer
A. Petrol
89
The gas which is obtained by the carbonisation of bituminous coal
Answer
D. Coke oven gas
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90
Which hydrocarbons have chain structure?
Answer
A. Paraffins
91
In a given combustion process
(i) The maximum temperature achieved through adiabatic complete combustion
varies with the type of reaction and percent of theoretical air supplied.
(ii) An increase in the air fuel ratio will effect an increase in the maximum
temperature
(iii) For a given fuel and a given pressure and temperature of the reactants,
the maximum adiabatic flame temperature that can be achieved is with a
stoichiometric mixture.
Which of these statements are correct?
Answer
C. Only (i) and (iii)
92
If a coal sample gave the analysis by weight of carbon 84% minimum weight of
oxygen required per kg of coal for complete combustion is
Answer
A. 2.24 kg
93
Weight of dry flue gas per kg of fuel is
Answer
A. Weight of carbon in 1 kg of fuel to the weight of carbon in 1 kg of flue gas
94
For complete conversion to water or steam, 1 kg of hydrogen requires
Answer
B. 8 kg of oxygen
95
Mass of carbon contained in 1 kg of flue gas is calculated from
Answer
A. Mass of carbon dioxide and mass of carbon monoxide present in them
96
To ensure complete combustion of fuel, modern tendency is to use
Answer
D. 25 to 50% of excess air
97
Caustic soda and pyrogallic acid is used in one flask of the Orsat apparatus to
determine the constituents of the flue gases which will absorb
Answer
B. Oxygen
98
Maximum loss of heat in a boiler is due to
Answer
A. Dry flue gases
99
The main objects of boiler trial are
(i) To determine the generating capacity of the boiler
(ii) To determine the thermal efficiency of the boiler when working at a definite
pressure
(iii) To prepare heat balance sheet for the boiler
Which of these statements are correct?
Answer
B. All of the above (i), (ii) & (iii)
100
Which of the following conditions should satisfy a reversible process?
(i) The process should not involve friction of any kind
(ii) Heat transfer should take place with finite temperature difference
(iii) There should be no free or unrestricted expansion
Which of these statements are correct?
Answer
D. Only (i) and (iii)
___________
057/2022 [P.T.O 15
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