electric cable (RIT)

Which of the following is the function of mechanical protection of the cable

• protect against rain

• protect against impact

• protect against humidity

• protect against leakage

The part named insulation is to protect against

• leakage of live part

• magnetic induction

• eddy current

• heat loss

Which if the following is NOT a property of a good conductor?

• It has low resistivity

• It has good thermal conductivity

• It is ductile

• it is shiny

Which of the following is true of aluminium as compared to copper?

• It is more flexible

• It is lighter

• It is a better conductor

• It has lower resistance

Which of the following materials is used for plating of switch contact?

• aluminium

• copper

• silver

• brass

Which of the following material is used for terminals and plug pins?

• Brass

• Gold

• mercury

• tungdten

Conductors are usually stranded to

• ensure flexibility

• reduce cost

• save material

• reduce resistance

According to SS638 , conductor of cross sectional area _____ mm² or less shall be copper

• 6

• 10

• 16

• 25

Where cables is specified as 7/0.67, the number 7 refers to the number of strands while the number 0.67 refers to

• radius of each strand

• diameter of each strand

• cross sectional area of each strand

• circumference of each strand

"2X2.5 mm² copper conductor , PVC insulated and PVC sheathed cable + CPC installed in PVC trunking "

In the above description , the 2.5 mm² refers to

• cross sectional area of conductor

• cross sectional area of insulation

• cross sectional area of sheath

• overall cross sectional area of entire cable