1) Range of temperature of oxy-acetylene flame is

2500— 2600°C

2100—2300°C

3500— 3600°C

3100— 3300°C

Correct Answer (D)

2) What is the color of acetylene gas cylinder?

Black

Red

Yellow

Green

Correct Answer (B)

3) What is the colour of oxygen gas cylinder?

Black

Red

Yellow

Green

Correct Answer (A)

4) What is the color of welding booth wall?

Red

Black

Green

Yellow

Correct Answer (B)

5) Which gas is not fuel gas?

Acetylene

coal-gas

Oxygen

hydrogen

Correct Answer (C)

6) Which process is not fusion process?

Resistance welding

Gas welding

Thermal welding

Arc welding

Correct Answer (A)

7) Welding torch has oxygen and acetylene gas in

handle

tip

regulator

mixing chamber

Correct Answer (D)

8) Oxygen cylinder is made up of

carbon steel

stainless steel

None of these

seamless steel

Correct Answer (D)

9) The temperature required for gas welding is

1000°C

2000°C

2500°C

3000°C

Correct Answer (D)

10) To make calcium carbide, the required heating temperature of cock and limestone is

1500°C

1900°C

1200°C

2000°C

Correct Answer (D)

11) While gas cutting process, which one of the point should be followed?

Oxygen valve is fully opened

Oxygen valve is partially opened

Acetylene valve is fully opened

Acetylene valve is partially opened

Correct Answer (B)

12) Pressure of gas in acetylene cylinder is

200 pound / sq. inch

350 pound / sq. inch

250 pound / sq. inch

400 pound / sq. inch

Correct Answer (C)

13) Name the substance that mixed with acetylene to stored in cylinder.

Water

Ammonia

Petroleum

Acylone

Correct Answer (D)

14) The indication of flash back is

voice of blast

dark fog with blast voice in nozzle

blow pipe heating

hose pipe burning

Correct Answer (B)

15) The main cause of slag inclusion is

used the large thickness electrode

used the large amount of current

not cleaned the workpiece property

used the small arc

Correct Answer (C)

16) Which of the following types is not fillet weld?

butt joint

lap joint

T-joint

Corner joint

Correct Answer (A)

17) Which one of the following is not a composition of spelter solder?

Copper = 50%, Zinc = 37%, Pb = 13%

Copper = 50%, Zinc = 37%, Tin = 23%

Copper = 67%, Zinc = 33%

Copper = 50%, Zinc = 50%

Correct Answer (A)

18) Soldering and brazing are the methods of joining.

  1. a) similar metals
  2. b) dissimilar metals
  3. c) Both (a) and (b)
  4. d) None of these
  5. Correct Answer (C)

19) The melting point of solder (mixture of tin and lead) is

195° C

200° C

183° C

210° C

Correct Answer (C)

20) What is the melting point of gun metal, whose filler metal composition is tin-63% and lead 37%?

202° C

183° C

189°

180°

Correct Answer (B)

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