Switchgear and Protection

A. current carrying contacts called electrodes
B. arc extinguishers
C. circuits to break the system
D. transformers to isolate the two systems
E. any of the above

A. current carrying contacts called electrodes
B. arc extinguishers
C. circuits to break the system
D. transformers to isolate the two systems
E. any of the above

A. have low contact resistance
B. be clean and smooth
C. be of sufficient size and proper shape
D. have all above properties

A. short-circuits
B. heavy loads
C. grounds
D. all of the above

A. induction
B. solid state
C. thermal
D. electromagnetic
E. all above

A. short-circuit
B. temperature
C. overload
D. over voltage

A. is yellow in colour
B. is lighter than air
C. is nontoxic
D. has pungent small
E. none of the above

A. Water
B. Oil
C. Air
D. SF6

A. Oil circuit breakers
B. Air blast circuit breakers
C. Minimum oil circuit breakers
D. All of the above

A. copper tungsten alloy
B. porcelain
C. electrolytic copper
D. aluminium alloy