A. Yes
B. No
Related Mcqs:
- In capacitance grading of cables we use a _______ dielectric?
A. composite
B. porous
C. homogeneous
D. hygroscopic - Capacitance grading of cable implies__________?
A. use of dielectrics of different permeabilities
B. grading according to capacitance of cables per km length
C. cables using single dielectric in different concentrations
D. capacitance required to be introduced at different lengths to counter the effect of inductance
E. none of the above - If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?
A. 5 kV/mm
B. 10 kV/mm
A. 15 kV/mm
D. 30 kV/mm - Dielectric strength of rubber is around____________?
A. 5 kV/mm
B. 15 kV/mm
C. 30 kV/mm
D. 200 kV/mm - The minimum dielectric stress in a cable is at_____________?
A. armour
B. bedding
C. conductor surface
D. lead sheath - Polyethylene has very poor dielectric and ageing properties
A. Yes
B. No - A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
A. one half
B. double
C. four times
D. none of the above - The insulating material for cables should____________?
A. be acid proof
B. be non-inflammable
C. be non-hygroscopic
D. have all above properties - Underground cables are laid at sufficient depth___________?
A. to minimise temperature stresses
B. to avoid being unearthed easily due to removal of soil
C. to minimize the effect of shocks and vibrations due to gassing vehicles, etc
D. for all of the above reasons - In a cable the voltage stress is maximum at____________?
A. sheath
B. insulator
E. surface of the conductor
D. core of the conductor
