A. Oil circuit breakers
B. Air blast circuit breakers
C. Minimum oil circuit breakers
D. All of the above
Related Mcqs:
- With which of the following, a circuit breaker must be equipped for remote operation ?
A. Inverse time trip
B. Time-delay trip
C. Shunt trip
D. None of the above
E. All of the above - Which of the following medium is employed for extinction of arc in air circuit breaker?
A. Water
B. Oil
C. Air
D. SF6 - Which of the following statements is incorrect ?
A. Lightning arrestors are used before the switchgear
B. Shunt reactors are used as compensation reactors
C. The peak short current is (1.8 xV2) times the A.C. component
D. The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance - For which of the following protection from negative sequence currents is provided ?
A. Generators
B. Motors
C. Transmission line
D. Transformers - Which of the following parameter can be neglected for a short line ?
A. Inductance
B. Capacitance
C. Resistance
D. Reactance - Which of the following circuit breakers has high reliability and minimum maintenance ?
A. Air blast circuit breakers
B. Circuit breaker with SF6 gas
C. Vacuum circuit breakers
D. Oil circuit breakers - Which of the following devices will receive voltage surge first travelling on the transmission line ?
A. Lightning arresters
B. Relays
C. Step-down transformer
D. Switchgear - For which of the following ratings of the transformer differential protection is recommended ?
A. above 30 kVA.
B. equal to and above 5 MVA
C. equal to and above 25 MVA
D. none of the above - By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
A. Radiation
B. Convection
C. Conduction
D. All of the above - On which of the following effects of electric current a fuse operates ?
A. Photoelectric effect
B. Electrostatic effect
C. Heating effect
D. Magnetic effect
