Top 150+ Solved Switch Gear and Protection MCQ Questions Answer
Q. H.R.C. fuse, as compared to a rewirable fuse, has
a. no ageing effect
b. high speed of operation
c. high rupturing capacity
d. all of the above
Q. On which of the following effects of electric current a fuse operates ?
a. Photoelectric effect
b. Electrostatic effect
c. Heating effect
d. Magnetic effect
Q. An isolator is installed
a. to operate the relay of circuit breaker
b. as a substitute for circuit breaker
c. always independent of the position of circuit breaker
d. generally on both sides of a circuit breaker
Q. A fuse in a motor circuit provides protection against
a. overload
b. short-circuit and overload
c. open circuit, short-circuit and overload
d. none of the above
Q. A fuse is never inserted in
a. neutral wire
b. negative of D.C. circuit
c. positive of D.C. circuit
d. phase dine
Q. Oil switches are employed for
a. low currents circuits
b. low voltages circuits
c. high voltages and large currents circuits
d. all circuits
Q. A switchgear is device used for
a. interrupting an electrical circuit
b. switching an electrical circuit 111.
c. switching and controlling an electrical circuit
d. switching, controlling and protecting the electrical circuit and equipment
Q. The fuse wire, in D.C. circuits, is inserted in
a. negative circuit only
b. positive circuit only
c. both (a) and (b)
d. either (a) or (b)
Q. By which of the following methods major portion of the heatgenerated in a H.R.C. fuse is dissipated ?
a. Radiation
b. Convection
c. Conduction
d. All of the above
Q. A short-circuit is identified by
a. no current flow
b. heavy current flow
c. voltage drop
d. voltage rise
Q. The information to the circuit breaker under fault conditions isprovided by
a. relay
b. rewirable fuse
c. H.R.C. only
d. all of the above
Q. To limit short-circuit current in a power system are used.
a. earth wires
b. isolators
c. H.R.C. fuses
d. reactors