Wireman – Semester 1, Module 9: Earthing

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Common for Wireman Trade 1st Year

NAME *

NAME OF THE ITI *

MOBILE NUMBER *

1 : What is the purpose of system earthing? *

2 points

A : To maintain ground at zero potential

B : To reduce the load current

C : To protect the equipment from over load

D : To reduce the losses

2: Why earth resistance value required to keep very low? *

2 points

A : For quick current flow

B : For easy measurement

C : For low power consumption

D : For low voltage drop

3: What is the minimum length of the earth electrode pipe? *

2 points

A : 1.5 metre

B : 2 metre

C : 2.25 metre

D : 2.5 metre

4 : What is the minimum size of the copperplate electrode? *

2 points

A : 30cm to 30cm

B : 60cm X 40cm

C : 60cm X 50cm

D : 60cm X 60cm

5 : What will happen to the value of earth resistance, if length of the earth pipe is increased? *

2 points

A : Remain same

B : Increases

C : Decreases

D : Infinity

6 : Which type of holder is to be earthed as per BIS? *

2 points

A : Angle holder

B : Bracket holder

C : Battern lamp holder

D : Pendant lamp holder

7 : What is size of earth conductor used in power load? *

2 points

A : 8 SWG

B : 10 SWG

C : 14 SWG

D : 20 SWG

8 : What is the range of good earth resistance? *

2 points

A : High resistance

B : Very low resistance

C : Medium resistance

D : Very high resistance

9 : How earth resistance value mainted in summer? *

2 points

A : Use new electrode

B : Use new coal and salt layer

C : Use new earth wire

D : Use water and maintain wet condition

10 : Which method is used to reduce earth resistance? *

2 points

A : Reducing the pit depth for earthing

B : Increasing the depth of earth pit

C : Decreasing the length of the electrode

D : Connecting number of earth electrode in parallel

11 : Which instrument is used to measure earth resistance? *

2 points

A : Megger

B : Ohm meter

C : Wheatstone bridge

D : Earth tester

12 : What principle earth tester works? *

2 points

A : Potential dividing method

B : Fall of potential method

C : Fall of resistance method

D : Current dividing method

13 : What is the reason for supplying AC to the electrodes for measuring earth resistance? *

2 points

A : AC is easily available

B : Protect the coils in the meter

C : Reduce the value of current in the meter

D : Avoid the effect of electrolytic Emf interference

14 : How many primary winding required in ELCB? *

2 points

A : One primary winding

B : Two primary windings

C : Three primary windings

D : Four primary windings

15 : What is the purpose of the ELCB? *

2 points

A : Control the fault circuit current

B : Protect the residual current

C : Protect the equipment from over load

D : Protect the circuit from short circuit

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