The fuse blows off by___________?
The fuse blows off by___________? A. burning B. arcingC. melting D. none of the above
The fuse blows off by___________? A. burning B. arcingC. melting D. none of the above
H.R.C. fuse, as compared to a rewirable fuse, has_________________? A. no ageing effect B. high speed of operation C. high rupturing capacityD. all of the above
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 breakerD. generally on both sides of a circuit breaker
Protection by fuses is generally not used beyond__________? A. 20 A B. 50 AC. 100 A D. 200 A
Oil switches are employed for_____________? A. low currents circuits B. low voltages circuitsC. high voltages and large currents circuits D. all circuits
A fuse in a motor circuit provides protection against__________? A. overloadB. 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 effectC. Heating effect D. Magnetic effect
The fuse rating is expressed in terms of_____________? A. current B. voltage C. VAR D. kVA
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