EPC-School 2012
M for Mechanical
Topic- Static
M for Mechanical
1)
When
the system pressure reaches set pressure the pressure safety valve
a) lifts fully to relieve the pressure
b) lifts proportional to the increase
in system pressure above the set pressure
c) does not lift
2)
Safety
valve opening is proportional to the rise in system pressure over and above the
set pressure.
(a) True (b) False
3) A
conventional pressure safety valves (without bellows) is installed on a
pressure vessel operating at 90 barg at 250 C.
The safety valve is set to pop at 100 barg. The valve is having a back-
pressure of 5 barg at the outlet. The Cold Differential Test Pressure (CDTP) on
the test bench will be
a) 90 b) 100 c) 95 d) 105
4)
Pilot
operated relief valves allows the system to be operated more close to the set
pressure
(a) True (b) False
5)
Rupture
Devices are single use devices
(a) True (b) False
6)
Relief
valves installed on LPG spheres are to be inspected as per
a) Indian Boiler regulations Act
b) Static and Mobile Pressure vessels
rule (SMPV)
c) Gujarat Factories Act
d) None of the above
7) 18/8 SS…..
a) Have 18Ni-8Cr nominal composition
b) Have 18Ni-8Mo nominal composition
c) Have 18Cr-8Ni nominal composition
d) Have 18Cr-8Mo nominal composition
8)
PSV
calibration in work shop is done at
a) Set Pressure
b) Back Pressure
c) Cold Differential Test pressure
d) Design pressure
9) Following
heat exchanger is preferred to handle unclean, hot hydrocarbons.
a) Fixed tube heat exchanger
b) U Tube heat exchanger
c) Floating head heat exchanger
d) Hair pin exchanger
10) In
radiant zone, source of heat to the processing fluid inside the tube, is from…
a) Burner flame
b) Hot gases
c) Refractory
d) All of the above
11) Purpose of inner and outer ring in
spiral wound gaskets is to
a) Contain and protect sealing elements
b) Prevent buckling
c) Direct more of the bolt load to sealing
element
d)All of the above
12) In SAP maintenance activity on a piece of
equipment is entered in
a) Work order
b) FIR/FAR
c) Notification
13) Tube to tubesheet joints in a shell and
tube heat exchanger can be
a) Expanded
b) Expanded and seal welded
c) Strength welded
d) All of the above
14) Baffle plates in a heat exchanger tube
bundle is used for
a) supporting the tubes
b) guiding the flow of the shell side
fluid
c) None of the above
d) Both (a) & (b)
15) In case of air fin coolers, fins are
provided on the tubes
a) to improve heat transfer
b) to provide additional strength to
tubes
c) to prevent damage to tubes as they
are exposed to atmosphere
d) All of the above
16) Refinery piping has been constructed as
per
a) ANSI B 31.3
b) ASME Sec VIII Div.1
c) API 610
d) None of the above.
17) For
a leak free flanged joint the following are necessary
a) gasket of correct specification
b) parallelity of flange faces
c) Tightening at correct torque
d) All of the above
18) Disadvantage
of floating head type shell & tube heat exchanger is
a) it cannot accommodate expansion of
tubes
b) it cannot be cleaned on shell side
c) Floating head gasket leak will
result in shutdown of the exchanger/unit.
d) All of the above
19)
Hydrotest
of a heat exchanger is done to ascertain
a) tube leaks
b) tube to tubesheet joint leaks
c) gasket leaks
d) all of the above
20)
Dye
penetrant test can be applied to detect
a) defects below the surface
b) defects open to the surface
c) Both
d) None of the above
21)
In
case of pipes
a) OD is a fixed standard value
b) ID is a fixed standard value
c) None of the above
22)
Hydrotest
pressure in a heat exchanger is usually
a) 1.5 times design pressure multiplied
by temperature correction
b) equal to design pressure
c) 1.5 times operating pressure
23)
Maximum
set pressure of the pressure relief device installed on a pressure vessel
a) equal to design pressure
b) 1.1 times design pressure
c) hydrotest pressure
d) 1.1 times the normal operating
pressure.
24) Pressure vessels are designed as per
a)ASME Sec VIII Div . 1
b)ANSI B 31.3
c)API 650
d)API 661
25) Strength of the metallic material
_____________ with temperature
a)increases
b)decreases
c)Remains same
d)None of the
above
26)
Steam generators come under which statutory body
a)Gujarat Factories Act
b)SMPV
c)IBR
d)None of the
above
27) Square pitch
tube layout in a exchanger tube bundle is preferred when
a)Shell side cleaning is expected
b)Shell side design temperature is
more than tube side
c)Tubes are stainless steel
d)All of the above
28) In piping
specification EC38EA, C stands for
a)Carbon steel
b)Corrosive service
c)C – Crude service
d)Copper
29) In piping
specification EC38EA “8” stands for
a)800 pound rating pressure
b)8” inches nominal dia of the pipe
c)Corrosion allowance of 8mm
d)Corrosion allowance of 6.0mm
30) A common
method used for testing of weld joint at site is
a)Hammer test
b)Destructive test
c)Radiographic test
31) Hydrotest of heat exchangers is cleared
at site by
a)Maintenance engineers
b)Operations engineer
c)Inspection engineer
d)None of the above
32) A check
valve is
a)Non return valve
b)Gate valve
c)Globe valve
d)None of the above
33) A
check valve can be used as an isolation valve
a)True
b)False
34) Pneumatic
test of pressure vessels is normally avoided in an operating plant due
a)Leakage detection is
difficult
b)Code does not permit
the same
c)Hazard of an explosion
and damage
d)All of the above
35) Cerawool
lining on heater shell in radiant section is done only
a)In furnaces with fuel
gas firing only
b)In furnaces with fuel
oil firing only
c)In furnaces with
combination firing
36) The
temperature of flue gas in furnace air preheater outlet should be
a)At least equal to dew
point temperature
b)As low as possible to
maximize the heat recovery
c)At least 15 C more
than dew point conditions
37) The
tube skin temperature of the heater could increase due to
a)Fouling inside the
tubes
b)Flame impingement
c)Drop in pass flows
d)One or more of the
above
38) In
cooling water heat exchangers the maximum permissible water outlet temperature is
a)43 C
b)Inlet
plus 5 deg C
c)No limit
39) In
cooling water exchangers, the minimum recommended velocity to minimize fouling in tubes is
a)2 m/sec
b)0.5 m/sec
c)0.9 m/sec
d)No limit
40) Low
point drains are critical from inspection due to
a)Dead end formed in the
LPD
b)Vibrations in the LPD
c)Both
41) The
minimum design life of a heater tube is
a)20 years
b)Unlimited life
c)100000 hrs
42) Metallurgy
selection of equipment components depends on
a)Operating conditions
b)Corrosion
characteristics
c)Economics
d)Material Availability
e)All of the above
43) There
is a high temperature spot on the radiant shell of fired heater. The area will be cooled by
a)Air
b)Water
c)Steam
d)None. Shutdown the
unit
44) What
is CUI?
a)Critical Unit
Indicators
b)Corrosion Under
Insulation
c)Commonly Used
Instruments
d)None of the above
45) Thermography
is typically used for
a)Measuring temperature
of heater tubes
b)Measure temperature of
electric panels
c)Measure temperature of
refractory lined pipe
d)All of the above
46) Primary
protection for under ground piping from corrosion is
a)Wrapping coating
b)Keeping the sand dry
c)Increasing corrosion
allowance.
47) Underground
piping in protected from corrosion by
a)Impressed current
cathodic protection system
b)Sacrificial anode
cathodic protection system
c)Either of the above
48) Water
used for hydrotest of SS316 stainless steel piping should have
a)Chlorides less than 30
ppm
b)Chlorides less than
100 ppm
c)Potable water can be
used
49) Material
selection for hydrogen service typically in hydrotreaters is done as per
a)Bechtel standard
b)API 941
c)Inspection engineer
requirements
d)Site urgency
50) A heat
exchanger is being hydrotested at 38 barg. What should be the pressure gage range
a)0 – 25 barg
b)0 – 40 barg
c)0 – 60 barg
d)0 – 200 barg
51) A
waste heat steam generator is under the purview
a)IBR
b)Factories Act
c)Static and Mobile
Pressure Vessel rule
52) A
heat exchanger is having 1000 tubes and 230 tubes are leaking. Is this acceptable case for
using the heat exchanger
a)Yes
b)No
53) The
component in Crude that causes high temperature corrosion is
a)Nitrogen
b)Chlorides
c)Sulphur
d)All of the above
54) Atmospheric
corrosion is taken care by
a)Metallurgy upgrade
b)Use zinc coating
c)Painting
55) Which
of the following are corrosion control strategies?
a)Accept corrosion and
replace component periodically
b)Add wash water ,
corrosion inhibitor, control operating parameters
c)Metallurgy upgrade
d)All of the above
56)
Corrosion
in the hydrocarbons streams processed is due to
a)Sulfur
b)Chlorides
c)Nitrogen
d)all of the
above
57)
As per IBR act, what is the minimum capacity
of the closed vessel in which water is converted into steam under pressurized
condition.
a)
22.25
liters
b)
Five
gallons
c)
22.5
liters
d)
Three
gallons.
58. IBR code is provides guidelines for the efficiency of
the boilers
a)
True
b)
False
59. Boilers are used to generate:.
a)
HP
steam
b)
MP
steam
c)
LP
steam
d)
All
of the above
60. Exhaust flue gases are used in
following boiler
a) Auxiliary boiler
b) HRSG
c) Waste heat boiler
d) None of the
above
61.Out of following which is boiler mountings.
a) Fusible Plug
b) Economiser
c) Steam Trap
d) None of the above
62.Out of following which is not a
boiler accessories;
a)
Super
heater
b)
Feed
pump
c)
Steam
Trap
d)
Safety
valve
63.
In
alloy steel total alloying element is less than 10 percent:
a.
True
b.
False
64.
What
are the composition of the P22 material
a.
1.25%
Cr and 0.5 % Molybdenum
b.
2.25%
Cr and 0.5 % Molybdenum
c.
2.25%
Cr and 1 % Molybdenum
d.
2.5%
Cr and 0.5 % Molybdenum
65.
Which
material is not suitable at temperature less than equal to 385 deg C ideally
a.
SA
106 Gr B
b.
SA
335 P22
c.
SA
335 P5
d.
SA
335 P9
66.
Natural
circulation can be takes place due to
density difference of the water and steam in the
boiler.
a.
True
b.
False
67.
Deaerator
is used to remove:
a.
Only
O2
b.
Only
CO2
c.
O2
and Co2 both
68.
Dosing
of which chemical act as oxygen scavenger in boiler feed water
a.
Hydrazine
Hydrate
b.
Morpholine
c.
Tri
sodium Phosphate
d.
Di-sodium
phosphate
69.
pH
is derived by :
a.
Measuring
Hydrogen ion concentration in milligrams per liter of
solution
b.
Measuring
Hydrogen ion concentration in kilograms per liter of
solution
c.
Measuring
Hydrogen ion concentration in grams per liter of
solution
d.
None
of the above
70. Which part of the
boiler is more prone to sulfur corrosion
a) Economiser
b) Super heater
c) Evaporator
71.
Hydrostatic
test of the vessel shall be carried out
at what pressure as per
a.
1.5
times the design pressure
b.
1.25
times the design pressure
c.
1.5
times of the operating pressure
d.
1.25
times of the operating pressure
72. Corrosion means:
a) Destruction of metal as a chemical reaction
only
b) As a electrochemical process only
c) Combination of a and b
73. For galvanic corrosion one of the
important requirement is
a) Two metal in contact without any
electrolyte
b) Two metals in contact having
different electrode potential in
presence of electrolyte
c) Two metals in contact with same
electrode potential in presence of
electrolyte
74. Carry over of
which impurities results in the corrosin on the turbine blades.
a) Magnesium
b) Calcium
c) Silica
d) Phosphate
75. Which chemical is
used as a pH booster in steam drum.
a) Phosphate
b)
Hydrzine
c)
Caustic
d)
Chlorides
- At what temperature, Stress
corrosion cracking takes place generally in presence
a) More than 60 Deg C
b) More than 60 Deg F
c) Ambient temperature
77. SA
106 Gr B is fully killed carbon steel material
a) True
b) False
78. After
hydrostatic test , pressure shall be released of any pressure vessel from the:
a) Low point drain when high point
b) High
point
79. Finned type tubes in the heat exchangers are
used for
a. To increase the heat transfer
b. To decrease the heat transfer
c. Ease of cleaning
80. Algae formation can be avoided in the cooling
towers by dosing
a) Phosphate
b) Chlorine
c) Calcium
d) Magnesium
81. Reverse osmosis means
a) The passage of water from a more
concentrated solution to a less
concentrated solution through a
semipermeable membrane under pressure.
b)The passage of water from a less
concentrated solution to a more
concentrated solution through a
semipermeable membrane under pressure
82. Is oxygen corrosive?
a)
Yes
b)
No
83.In
Electrode E7018, Numeric 70 indicates :
a)
Tensile
stress of electrode metal is 70 Psi
b)
Tensile
stress of electrode metal is 70 Ksi
c)
Tensile
stress of electrode metal is 70 Mpa
d)
Tensile
stress of electrode metal is 70 Kg/cm2
84. One bar pressure equal to
a)
1.02 kgf/cm2
b)
14.05 psi
c)
all of the above
d)
None of the above
85. In fire tube boiler
a)
Flue gases in tube side and water is outer side
b)
Flue gases in outer side and water in tube side
c)
Both of the above
d)
None of the above
86. Heat transfer in the boiler can be take place by means of:
a)
Radiation and conduction
b)
Radiation and convection
c)
Convection and
conduction
d)
Radiation, convection and conduction
Answers to Above Questions-
1. (a) lifts fully
to relieve the pressure
2. (b) False
3. (c ) 95
4. (a) True
5. (a) True
6. (b) Static and Mobile Pressure vessels rule (SMPV)
7. (c) Have 18Cr-8Ni nominal composition
8. (c) Cold Differential Test pressure
9 (c ) Floating head heat exchanger
10 (d) All of the
above
11 (d) All of the
above
12 (c )
Notification
13 (d) All of the
above
14 (d ) Both (a)
& (b)
15 (a) to improve
heat transfer
16 (a) ANSI B 31.3
17(d) All of the
above
18(c ) Floating
head gasket leak will result in shutdown of the exchanger/unit
19(d) All of the
above
20 (b) defects open
to the surface
21 (a) OD is a
fixed standard value
22 (a) 1.5 times
design pressure multiplied by temperature correction
23(a) equal to
design pressure
24 (a) ASME
Sec VIII Div . 1
25 (b) decreases
26 (c) IBR
27 (a) Shell side cleaning
is expected
28 (a) Carbon
steel
29 (d) Corrosion allowance of 6.0mm
30 (c) Radiographic test
31 (c ) Inspection
engineer
32 (a) Non return
valve
33 (b) false
34 (c) Hazard of an
explosion and damage
35 (a) In furnaces
with fuel gas firing only
36 (c ) at least 15
C more than dew point conditions
37 (d) One or more
of the above.
38 (a) 43 C
39 (c ) 0.9 m/sec
40 (c) Both
41 (c ) 100000 hrs
42 (e) all of the
above
43 (c ) Steam
44 (b) Corrosion
Under Insulation
45 (d) All of the
above
46 (a) Wrapping
coating
47 (c ) Either of
the above
48 (a) Chlorides
less than 30ppm
49 (b) API 941
50 (c ) 0 – 60 barg
51 (a) IBR
52 (b) No
53 (c) Sulfur
54 (c ) Painting
55 (d) All of the
above
56 (d) All of the
above
57 (b) Five gallons
58 (b) False
59 (d) All of the
above
60 (b) HRSG
61 (a) Fusible Plug
62 (a) Super heater
63 (a) True
64(c) 2.25% Cr and
1 % Molybdenum
65 (a) SA 106 Gr B
66 (a) True
67 (c ) O2 and Co2
both
68 (a) Hydrazine
Hydrate
69 (c) Measuring
Hydrogen ion concentration in grams per liter of solution
70 (a) Economiser
71 (a) 1.5 times
the design pressure
72 (c) Combination
of a and b
73 (b)Two metals in
contact having different electrode potential in presence of electrolyte
74 (c ) Silica
75 (a) Phosphate
76 (a) More than 60
Deg C
77 (a) True
78 (b)High point
79 (a) To increase
the heat transfer
80 (b) Chlorine
81 (a)The passage
of water from a more concentrated solution to a less concentrated solution
through a semipermeable membrane under pressure.
82 (a) Yes
83 (b) Tensile
stress of electrode metal is 70 Ksi
84 (a) 1.02 kgf/cm2
85 (a) Flue gases in tube side and water is outer side
86 (d) Radiation, convection and conduction
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