WELDING SOLDERING AND BRAZING MCQ 3

1) In which of the following form flux does not available?

Powder

Liquid

Paste

Vapour

Correct Answwr- (D)

2) The functions performed by the flux are

clean the joining surface

prevent from oxidisation

help to melt the Solder

All of the above

Correct Answwr- (D)

3) For brazing, speltar is an alloy of

tin and lead

tin, lead and aluminium

silver, copper and zinc

None of these

Correct Answwr- (C)

4) The method of cleaning of the surfaces of soldering is

a) mechanical method

b) chemical method

c) electrical method

d) Both (a) and (b)

Correct Answwr- (D)

5) For cleaning of copper ………….. is used.

nitric acid

dilute sulphuric acid

concentrated sulphuric acid

dilute Hcl

Correct Answwr- (A)

6) Grease can be removed from surface by using

solvent of alcohol carbon tetrachloride

solvent Of alcohol carbon pentachloride

by using ammonia

None of the above

Correct Answwr- (A)

7) Which one of the following is a method of soldering?

Soldering iron method

Spray method

Resistance method

All of these

Correct Answwr- (D)

8) The function of flux during soldering is

to prevent corrosion

to avoid porosity in solder

to promote wet surface

to remove oxides from the soldering surface

Correct Answwr- (D)

9) Which one of the following is not the function of flux in braze welding?

Chemically clean the joint

Evaporate before melting the filler metal

Remove impurities from the joint

Allow molten filler metal to flow easily

Correct Answwr- (B)

10) The electric soldering iron consists of

handle

shank

bit-tip

All of these

Correct Answwr- (D)

11) After cleaning the soldering equipment a thick layer of resin is coated on

shank

bit

handle

None of these

Correct Answwr- (B)

12) After soldering ………………. is removed from the surface of metal

a) flux

b) filler metal

c) Both (a) and (b)

d) None of these

Correct Answwr- (A)

13) The process by which metal remains in its original structure after joining is

a) soldering

b) brazing

c) Both (a) and (b)

d) welding

Correct Answwr- (C)

14) The soldering iron is kept …… after use.

in its box

anywhere

on a table

in a stand

Correct Answwr- (D)

15) The filler metal used for brazing of aluminium is

a) Cu-P

b) Mg

c) Al-Si alloy

d) None of these

Correct Answwr- (C)

16) For brazing of magnesium alloy, the filler metal used is

a) Mg

b) Mg-Cu-Zn

c) Ni-Ag

d) None of these

Correct Answwr- (A)

17) The major constituent of flux for gold-copper alloys in brazing is

a) borax

b) flouride

c) chloride

d) Both (b) and (C)

Correct Answwr- (A)

18) In which of the following operation the mechanical property of material changes at joint?

Soldering

Brazing

Welding

All of these

Correct Answwr- (C)

19) Which of the following operation required heat treatment after joining?

Welding

Brazing

Soldering

All of these

Correct Answwr- (A)

20) By using oxy-acetylene flame the consumption of acetylene gas in welding of medium steel was 10 litres. The consumption of oxygen from cylinder is

5 litre

10 Iitre

15 Iitre

20 Iitre

Correct Answwr- (D)

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