Mocktest Sub Engineer – Cable-earthing & Welding

The objective of earthing or grounding is

a) to provide as low resistance possible to the ground

b) to provide as high resistance possible to the ground

c) to provide flow of positive, negative and zero sequence currents

d) none of the above

Correct! Wrong!

Non – consumable electrodes are made of

a. Carbon

b. Graphite

c. Either carbon or graphite

d. Same material as the metal pieces to be welded

Correct! Wrong!

Earth wire or ground wire is made of

a) copper

b) aluminum

c) iron

d) galvanized steel

Correct! Wrong!

In inert gas metal arc welding,

a. Argon is used for welding thin materials and helium is used for welding thick materials

b. Both argon and helium are used for welding thin materials

c. Both argon and helium are used for welding thick materials

Correct! Wrong!

The size of the earth or ground wire is based on the

a) maximum fault current carrying through the ground wire

b) rated current carrying capacity of the service line

c) depends on the soil resistance

d) both (a) and (c)

Correct! Wrong!

Average resistance of human body is

a) 500 ohms

b) 1000 ohms

c) 1500 ohms

d) 2000 ohms

Correct! Wrong!

Seam-welding is.........

A.Multi-spot welding process

B.Continuous spot welding process

C.Used to form mesh

D.Used for welding cylindrical objects

Correct! Wrong!

Which of the following protects a cable against mechanical injury ?

(a) Bedding

(b) Sheath

(d) None of the above

Correct! Wrong!

The insulating material for a cable should have

(a) low cost

(b) high dielectric strength

(d) all of the above

Correct! Wrong!

The voltage – current characteristics of the arc welding must be

a. Exponentially rising

b. Drooping

c. Straight line

d. Parabolic

Correct! Wrong!

Moisture content in the soil __ the earth soil resistance

a) increase

b) decrease

c) does not affect

d) none of the above

Correct! Wrong!

For a good weld,

a. Cross – section of the added metal should be small and oxidation should be minimum

b. Cross – section of the added metal should be small and oxidation should be maximum

c. Cross – section of the added metal should be large and oxidation should be minimum

d. Cross – section of the added metal should be large and oxidation should be maximum

Correct! Wrong!

Generally grounding is provided for

a) only for the safety of the equipment

b) only for the safety of the operating personnel

c) both (a) and (b)

d) none of the above

Correct! Wrong!

Projection welding is.......

A.Multi-spot welding process

B.Continuous spot welding process

C.Used to form mesh

D.Used to make cantilevers

Correct! Wrong!

Cross-wire welding is.......

A.Multi-spot welding process

B.Continuous spot welding process

C.Used to form mesh

D.Used where additional strength is desired

Correct! Wrong!

Advantage of using electron beam welding is / are

a. Welds are clean

b. Absence of porosity

c. Distortion less

d. All of these

Correct! Wrong!

TIG welding is best suited for welding.......

A.Mild welding

B.Stainless steel

C.Carbon steel

D.Aluminium

Correct! Wrong!

How many cores are used in a cable for the transmission of voltages upto 66 kV?

a. Single core.

b. Two core.

c. Three core.

d. All of the above.

Correct! Wrong!

Thermit welding is a form of......

A.Resistance welding

B.Gas welding

C.Fusion welding

D.Forge welding

Correct! Wrong!

Factors on which soil resistance depends

a) depth of the electrode

b) moisture

c) Nacl

d) all the above

Correct! Wrong!

Mocktest Sub Engineer - Cable-earthing & Welding

Your Marks

The objective of earthing or grounding is

Non – consumable electrodes are made of

Earth wire or ground wire is made of

In inert gas metal arc welding,

The size of the earth or ground wire is based on the

Average resistance of human body is

Seam-welding is.........

Which of the following protects a cable against mechanical injury ?

The insulating material for a cable should have

The voltage – current characteristics of the arc welding must be

Moisture content in the soil __ the earth soil resistance

For a good weld,

Generally grounding is provided for

Projection welding is.......

Cross-wire welding is.......

Advantage of using electron beam welding is / are

TIG welding is best suited for welding.......

How many cores are used in a cable for the transmission of voltages upto 66 kV?

Thermit welding is a form of......

Factors on which soil resistance depends

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