WELDING MCQ 1
WELDING MCQ 1
1) If a worker has suffered from electric shock, he should be
kept warm and covered
made to walk
given a cold drink
given an alcoholic drink
Correct Answer (A)
2) Which one of the following is a temporary joint?
Riveted joint
Press fit joint
Welded joint
Soldered joint
Correct Answer (B)
3) Which type of fire extinguisher is used in a welding shop?
Foam type extinguisher
Dry powder extinguisher
Carbon Dioxide extinguisher
Halon extinguisher
Correct Answer (C)
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
Correct Answer (C)
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
Correct Answer (A)
6) The welding machine, which is used to convert AC welding supply to DC welding supply is
Rectifier set
Motor generator set
Engine generator set
Welding transformer
Correct Answer (A)
7) In DC welding heat distribution is possible between 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
Correct Answer (A)
8) The size of a welding machine is determined by
Output amperage
Closed circuit voltage
Open circuit voltage
Input amperage
Correct Answer (A)
9) The position in which it is easiest to weld is
Overhead
Horizontal
Vertical
Flat
Correct Answer (D)
10) The electrode size refers to
diameter (overall) of electrode
diameter of its core wire
length of electrode
thickness of flux coating
Correct Answer (B)
11) One of the functions of electrode coating is
to increase welding current
to prevent rusting
to stabilize the arc
to control arc temperature
Correct Answer (C)
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”
Correct Answer (B)
13) The correct colours for oxygen and acetylene hoses are:
Black for oxygen and maroon for acetylene
Red for oxygen and blue for acetylene
Black for oxygen and red for acetylene
Red for oxygen and maroon for acetylene
Correct Answer (A)
14) In an acetylene cylinder, the acetylene is dissolved in
Water
Mercury
Carbon dioxide
Acetone
Correct Answer (D)
15) The function of the central hole in the tip of the cutting blowpipe is
Supply acetylene for cutting
Supply oxygen for preheating
Supply oxygen for cutting
Supply acetylene for preheating
Correct Answer (C)
16) Cast iron contains two elements, whichmake it difficult to cut it by gas cutting.What are these elements?
Silicon and sulphur
Silicon and graphite
Graphite and phosphorous
Sulphur and phosphorous
Correct Answer (B)
17) Which fuel gas is used for cutting deep under water?
Methane
LPG
Hydrogen
Acetylene
Correct Answer (C)
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
Correct Answer (B)
19) The correct flame for preheating before cutting is
oxidizing flame
neutral flame
carburising flame
slightly carburizing flame
Correct Answer (B)
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
