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8/10/2019 Common Question on Piping Interview
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35 Common Question on Piping Interview1.Which of the following is fully killed steel?
a)ASTM A 53b)ASTM A 106
c)ASTM A 333
d)All of the above
Ans. b
2.What is the mills tolerance to be considered for the thickness calculation ofsmls pipe as per ASME B31.3a)12b)12.25c)12.5
d)None of the above
Ans. c
3.Butt welded fittings (upto 600#) are generally used in which Size range
a)1/2 & aboveb)2 & above
c)Both a & bd)None of the above
Ans. b
4.ASME B16.10 describes about
a)Face to face & end to end dimensions of non-ferrous valvesb)Face to face & end to end dimensions of ferrous valves
c)Both a & bd)None of the above
Ans. b
5.ASTM Std. for 6 C.S welded pipe isa)A106 Gr.B
b)A53 Gr.Bc)API 5L Gr.B
d)All of the above
Ans. b
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6.ASTM Std. for 8 C.S 150# flangea)A234Gr WPBb)A216Gr WCBc)A105d)None of the above
Ans. c
7.Usually the ASTM Std. for 30 L.T.C.S. EFW pipe isa)A333 Gr.6b)A106 Gr.Bc)A671 Gr.CC60 Cl.32d)All of the above
Ans. c
8.Which of the fluid Service is non-toxic in nature?a)Category Db)Category Mc)High Pressure fluid serviced)Normal fluid service
Ans. a
9.All Pipe bends in CS are ____________a)hot formed
b)cold formed
c)both a & bd)none of the above
Ans. b
10.What is the Size range in NPS for ASTM A106 Smls.Pipea)1/8 to 46b)1/8 to 44c)1/8 to 48d)None of the above
Ans. c
11.What is the dmn.std. for S.B. gate valve?
a)API-602b)API-600c)API-609d)None of the aboveAns. a
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12.What is the dmn.std. for L.B. gate valve?a)API-602b)API-600c)API-609d)None of the above
Ans. b
13.What is the dmn.std. for S.B. globe valve?a)BS-5351b)BS-5352c)BS-1873d)API-602
Ans. b
14.What is the dmn.std. for L.B. globe valve?a)BS-5351b)BS-5352c)BS-1873d)API-602
Ans. c
15.What is the dmn.std. for check valve?a)BS-5352
b)BS-1868
c)BS-1873d)Both a & b
Ans. d
16.What is the dmn.std. for Ball valve?a)BS-5351b)BS-5352c)BS-1873d)None of the above
Ans. a
17.Steam pipe lines are usually _________________
a)ERWb)EFWc)Seamlessd)None of the aboveAns. c
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18.Low temp. carbon steel shall be used below which temp. in 0Ca)-20b)-30c)-29d)-40
Ans. c
19.What is the std. used for Welded and seamless wrought steel pipe?a)ASME B36.10b)ASME B36.19c)ASME B16.11d)ASME B16.9
Ans. a
20.Small bore fitting are covered under which American std.?a)ASME B36.10b)ASME B36.19c)ASME B16.11d)ASME B16.9
Ans. c
21.Large bore fittings are covered under which American std.?a)ASME B36.10
b)ASME B36.19
c)ASME B16.11d)ASME B16.9
Ans. d
22.Which Std. is used for large dia. flanges ?a)ASME B16.5b)ASME B16.47c)ASME B16.48d)None of the above
Ans. b
23._________is used as the fitting material in LTCS for Sizes usually 2 &
abovea)ASTM A420 Gr.WPL6b)ASTM A350 Gr.LF2c)Both a & bd)None of the above
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Ans. a
24._________is used as the fitting material in LTCS for Sizes usually 11/2 &belowa)ASTM A420 Gr.WPL6
b)ASTM A350 Gr.LF2c)Both a & bd)None of the above
Ans. b
25._____________ is a non-return Valve.
a)Gate Valveb)Globe valvec)Ball Valved)Check Valve
Ans. d
26.What is the dmn.std. for Plug valve?a)BS-5352b)BS-5351c)API-599d)API-602
Ans. c
27._________ is the maximum temp. till which Carbon Steel can be used as perB31.3
a)4200Cb)4290Cc)4250Cd)4270C
Ans. c
28._________ is the minimum temp. till which Carbon Steel can be used as per
B31.3a)-300C
b)-280Cc)-450C
d)-290C
Ans. d
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29.Under which p group is Carbon Steel Considered?a)1b)3c)6d)7
Ans. a
30.Generally _____________ is used as a by-pass Valvea)Gate Valveb)Butterfly Valvec)Ball Valved)Globe Valve
Ans. d
31.Types of Ball Valve:a)Full Portb)Regular Portc)Soft Seat & Metal Seatd)All of the above
Ans. d
32.Types of Check Valve:a)Lift type
b)Swing type
c)Wafer typed)All of the above
Ans. d
33.Gate & Ball Valve are ________________ valvesa)Isolatingb)Regulatingc)Non-returnd)None of the above
Ans. a
34.Globe Valve is a ________________ valve
a)Isolatingb)Regulatingc)Non-returnd)None of the aboveAns. b
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35.What is the minimum thickness required for CS pipe which needs PWHT
requirement?a)18 mmb)20 mm
c)19 mmd)21 mm
Ans. c