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
A balanced 3-phase system consists of_______________?
(A) zero sequence currents only
(B) positive sequence currents only
(C) negative and zero sequence currents
(D) zero, negative and positive sequence currents
A short-circuit is identified by_____________?
(A) no current flow
(B) heavy current flow
(C) voltage drop
(D) voltage rise
Oil switches are employed for_____________?
(A) low currents circuits
(B) low voltages circuits
(C) high voltages and large currents circuits
(D) all circuits
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
On which of the following effects of electric current a fuse operates ?
(A) Photoelectric effect
(B) Electrostatic effect
(C) Heating effect
(D) Magnetic effect
The power loss is an important factor for the design of_______________?
(A) transmission line
(B) motor
(C) generator
(D) feeder
The material used for fuse must have_____________?
(A) low melting point and high specific resistance
(B) low melting point and -low specific resistance
(C) high melting point and low specific resistance
(D) low melting point and any specific resistance