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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