A. connecting lines in parallel
B. connecting lines in series
E. using machines of high impedance
D. reducing the excitation of machines
E. none of the above
Related Mcqs:
- A transmission line is protected by_____________?
A. inrush protection
B. distance protection
C. time graded and current graded over current protection
D. both (B) and (C)
E. none of the above - A short-circuit is identified by_____________?
A. no current flow
B. heavy current flow
C. voltage drop
D. voltage rise - For the protection of power station buildings against direct strokes the requirements are___________?
A. interception
B. interception and conduction
C. interception, conduction and dissipation
D. interception, conduction, dissipation and reflection
E. none of the above - To protect most of the electrical equipment handling low power, the types of relays used are______________?
A. thermocouple
B. electronic and bimetallic
C. both (A) and (B)
D. none of the above - The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?
A. lubricate the contacts
B. insulate the contacts from switch body
C. extinguish the arc
D. all of the above
E. none of the above - Air blast circuit breakers for 400 kV power system are designed to operate in_______________?
A. 100 microsecond
B. 50 millisecond
C. 0.5 sec
D. 0.1 sec - The inductive interference between power and communication line can be minimized by__________?
A. transposition of the power line
B. transposition of the communication line
C. both (A) and (B)
D. increasing the distance between the conductors - To limit short-circuit current in a power system are used______________?
A. earth wires
B. isolators
C. H.R.C. fuses
D. reactors - The power loss is an important factor for the design of_______________?
A. transmission line
B. motor
C. generator
D. feeder - Fault diverters are basically____________?
A. fuses
B. relays
C. fast switches
D. circuit breakers
