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Utilization of Electrical Energy MCQ PDF 1
1)If a worker has suffered from electric shock, he should be
A.given a cold drink
B.kept warm and covered
C.made to walk
D.given an alcoholic drink
Answer-B
2)Which one of the following is a temporary joint
A.Welded joint
B.Press fit joint
C.Soldered joint
D.Riveted joint
Answer-B
3) Which type of fire extinguisher is used in a welding shop
A.Halon extinguisher
B.Foam type extinguisher
C.Dry powder extinguisher
D.Carbon Dioxide extinguisher
Answer-D
4) The arc utilized in electric arc welding is a
A.High voltage, high current discharge
B.Low voltage, low current discharge
C.Low voltage, high current discharge
D.High voltage, low current discharge
Answer-C
5) Which one of the following is the type of transformer used in arc welding
A.Step down
B.Step up
C.One-to-one
D.Capable of increasing supply voltage
Answer-A
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6) The welding machine, which is used to convert AC welding supply to DC welding supply is
A.Engine generator set
B.Welding transformer
C.Rectifier set
D.Motor generator set
Answer-C
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
A.Positive 2/3 and negative 1/3
B.Positive 1/3 and negative 2/3
C.Positive 3/4 and negative 1/4
D.Positive 1/4 and negative 3/4
Answer-A
8) The size of a welding machine is determined by
A.Open circuit voltage
B.Closed circuit voltage
C.Output amperage
D.Input amperage
Answer-C
9) The position in which it is easiest to weld is
A.Horizontal
B.Overhead
C.Vertical
D.Flat
Answer-D
10) The electrode size refers to
A.diameter of its core wire
B.thickness of flux coating
C.diameter (overall) of electrode
D.length of electrode
Answer-A
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11) One of the functions of electrode coating is
A.to prevent rusting
B.to stabilize the arc
C.to increase welding current
D.to control arc temperature
Answer-B
12) The electrodes are manufactured in two standard lengths namely
A.350 mm and 250 mm
B.350 mm and 450 mm
C.400 mm and 500 mm
D.12” and 10”
Answer-B
13) The correct colours for oxygen and acetylene hoses are
A.Black for oxygen and red for acetylene
B.Black for oxygen and maroon for acetylene
C.Red for oxygen and blue for acetylene
D.Red for oxygen and maroon for acetylene
Answer-B
14) In an acetylene cylinder, the acetylene is dissolved in
A.Mercury
B.Carbon dioxide
C.Water
D.Acetone
Answer-D
15) The function of the central hole in the tip of the cutting blowpipe is
A.Supply acetylene for preheating
B.Supply oxygen for preheating
C.Supply oxygen for cutting
D.Supply acetylene for cutting
Answer-C
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16) Cast iron contains two elements, which make it difficult to cut it by gas cutting.What are
these elements
A.Silicon and graphite
B.Graphite and phosphorous
C.Sulphur and phosphorous
D.Silicon and sulphur
Answer-A
17) Which fuel gas is used for cutting deep under water
A.Methane
B.Acetylene
C.Hydrogen
D.LPG
Answer-C
18) If L (mm) is the length of the inner cone of the flame, the tip-to-metal distance should be
A.L mm
B.L+2mm
C.L+4mm
D.L+6mm
Answer-B
19) The correct flame for preheating before cutting is
A.oxidizing flame
B.neutral flame
C.carburising flame
D.slightly carburizing flame
Answer-B
20) While gas cutting the nozzle should
A.almost touch the work
B.be 10 mm away from work
C.be 2 mm away from work
D.be 5 mm away from work
Answer-D
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