WELDING MCQ PART – 1 FOR SEM 1

1) If a worker has suffered from electric shock, he should be

given an alcoholic drink

given a cold drink

made to walk

kept warm and covered

2) Which one of the following is a temporary joint?

Welded joint

Soldered joint

Riveted joint

Press fit joint

3) Which type of fire extinguisher is used in a welding shop?

Halon extinguisher

Dry powder extinguisher

Foam type extinguisher

Carbon Dioxide extinguisher

4) The arc utilized in electric arc welding is a

High voltage, high current discharge

Low voltage, low current discharge

Low voltage, high current discharge

High voltage, low current discharge

5) Which one of the following is the type of transformer used in arc welding?

Step down

Step up

One-to-one

Capable of increasing supply voltage

6) The welding machine, which is used to convert AC welding supply to DC welding supply is

Welding transformer

Engine generator set

Motor generator set

Rectifier set

7) In DC welding heat distribution is possible between the electrode and the base metal due to the change of polarity. The distribution of heat is

Positive 2/3 and negative 1/3

Positive 1/3 and negative 2/3

Positive 3/4 and negative 1/4

Positive 1/4 and negative 3/4

8) The size of a welding machine is determined by

Input amperage

Output amperage

Open circuit voltage

Closed circuit voltage

9) The position in which it is easiest to weld is

Flat

Vertical

Horizontal

Overhead 

10) The electrode size refers to

the diameter of its core wire

the thickness of the flux coating

diameter (overall) of electrode

length of electrode

11) One of the functions of the electrode coating is

to stabilize the arc

to prevent rusting

to control arc temperature

to increase welding current

12) The electrodes are manufactured in two 

standard lengths namely

350 mm and 250 mm

350 mm and 450 mm

400 mm and 500 mm

12” and 10”

13) The correct colors for oxygen and acetylene hoses are:

Black for oxygen and red for acetylene

Red for oxygen and blue for acetylene

Black for oxygen and maroon for acetylene

Red for oxygen and maroon for acetylene

14) In an acetylene cylinder, the acetylene is dissolved in

Water

Carbon dioxide

Acetone

Mercury

15) The function of the central hole in the tip of the cutting blowpipe is

Supply acetylene for preheating

Supply acetylene for cutting

Supply oxygen for preheating

Supply oxygen for cutting

16) Cast iron contains two elements, which make it difficult to cut it by gas cutting. What are these elements?

Graphite and phosphorous

Silicon and graphite

Sulphur and phosphorous

Silicon and sulphur

17) Which fuel gas is used for cutting deep under water?

Acetylene

LPG

Methane

Hydrogen

18) If L (mm) is the length of the inner cone of the flame, the tip-to-metal distance should be

L mm

L+2mm

L+4mm

L+6mm

19) The correct flame for preheating before cutting is

oxidizing flame

neutral flame

carburizing flame

slightly carburizing flame

20) While gas cutting the nozzle should

almost touch the work

be 10 mm away from work

be 2 mm away from work

be 5 mm away from work