Cables MCQs - Quiz 1

1. Conduit pipes are normally used to protect _____ cables.
A) Unsheathed
B) Armoured
C) PVC Sheathed
D) All of the above

The correct answer is A

2. The minimum dielectric stress in a cable is at:
A) Armour
B) Bedding
C) Conductor surface
D) Lead sheath

The correct answer is D

3. In single core cables armouring is not done to:
A) Make it flexible
B) Avoid excessive sheath losses
C) A & B
D) None of the above

The correct answer is B

4. Dielectric strength of rubber is nearly:
A) 3 kV/mm
B) 100 kV/mm
C) 30 kV/mm
D) 300 kV/mm

The correct answer is C

5. Low tension cables are used up to:
A) 250 V
B) 500 V
C) 750 V
D) 1000 V

The correct answer is D

6. In a cable, the maximum stress under operating conditions is at:
A) insulation layer
B) sheath
C) armour
D) conductor surface

The correct answer is D

7. High tension cables are used generally up to:
A) 11kV
B) 33kV
C) 66 kV
D) 132 kV

The correct answer is A

8. The relative permittivity of rubber is between:
A) 2 and 3
B) 5 and 6
C) 8 and 10
D) 12 and 14

The correct answer is A

9. If the length of a cable is doubled, its capacitance:
A) becomes one-fourth
B) becomes one-half
C) becomes double
D) remains unchanged

The correct answer is C

10. The surge resistance of cable is around:
A) 5 ohms
B) 20 ohms
C) 40 ohms
D) 100 ohms

The correct answer is C