Electrician 4th sem CB & Relays

Which circuit breaker is installed along with wiring circuit against leakage current protection?

• OCB

• MCB

• ELCB

• MCCB

Which relay hold their contacts in position after power is cutoff?

• Read relay

• Current relay

• Voltage relay

• Latching relay

What is the name of circuit breaker?

• Oil circuit breaker

• Air blast circuit breaker

• Vacuum circuit breaker

• Air break circuit breaker

How the rupturing capacity of circuit breaker is rated?

• KV

• KW

• MVA

• KVAR

What is the pick-up voltage in a over voltage relay indicated?

• Working voltage of relay

• Maximum voltage rating of relay

• Minimum voltage rating of relay

• Minimum voltage to start the relay

What is the function of Buchholz relay in power transformer?

• Over load and short circuit protection

• Over voltage and earth fault protection

• Open circuit and earth fault protection

• Open circuit and over voltage protection

Which type of load is protected by G’ series MCB?

• Ovens

• Geysers

• Air conditioners

• General lighting systems

Which type of relay is used in both A.C and D.C supply?

• Reed relay

• Impulse relay

• Thermal relay

• Clapper-type armature relay

Which circuit breaker is used as a switch and protective device in the domestic wiring circuit?

• Air circuit breaker

• Miniature circuit breaker

• Moulded case circuit breaker

• Earth Leakage circuit breaker

What is the purpose of trip coil used in circuit breakers?

• Easy operation

• Remote operation

• Accurate operation

• Emergency operation