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…
Pressure cables are generally not used beyond__________? A. 11 kV B. 33 kVC. 66 kV D. 132 kV
The relative permittivity of rubber is____________? A. between 2 and 3 B. between 5 and 6 C. between 8 and 10 D. between 12 and 14
The material for armouring on cable is usually__________? A. steel tape B. galvanised steel wireC. any of the above D. none of the above
Conduit pipes are normally used to protect _______ cables A. unsheathed cables B. armoured C. PVC sheathed cables D. all of the above
PVC stands for____________? A. polyvinyl chloride B. post varnish conductor C. pressed and varnished cloth D. positive voltage conductor E. none of the above
In capacitance grading of cables we use a _______ dielectric? A. composite B. porous C. homogeneous D. hygroscopic
The surge resistance of cable is__________? A. 5 ohms B. 20 ohmsC. 50 ohms D. 100 ohms
The minimum dielectric stress in a cable is at_____________? A. armour B. bedding C. conductor surfaceD. lead sheath
In the cables, the location of fault is usually found out by comparing____________? A. the resistance of the conductor B. the inductance of conductorsC. the capacitances of insulated conductors D. all above parameters