[amp_mcq option1=”burning” option2=”arcing” option3=”melting” option4=”none of the above” correct=”option1″]
Switchgear protections
32. H.R.C. fuses provide best protection against
[amp_mcq option1=”overload” option2=”reverse current” option3=”fuses provide best protection against A. overload B. reverse current C. open-circuits” option4=”short-circuits” correct=”option1″]
Detailed SolutionH.R.C. fuses provide best protection against
33. Overfluxing protection is recommended for
[amp_mcq option1=”distribution transformer” option2=”generator transformer of the power plant” option3=”auto-transformer of the power plant” option4=”station transformer of the power plant” correct=”option2″]
34. The main function of a fuse is to
[amp_mcq option1=”protect the line” option2=”open the circuit” option3=”protect the appliance” option4=”prevent excessive currents E. none of the above” correct=”option4″]
35. A short-circuit is identified by
[amp_mcq option1=”no current flow” option2=”heavy current flow” option3=”voltage drop” option4=”voltage rise” correct=”option2″]
36. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
[amp_mcq option1=”Zero” option2=”Unity” option3=”Infinity” option4=”None of the above” correct=”option1″]
37. Ionization in circuit breaker is facilitated by
[amp_mcq option1=”high temperature” option2=”increase of mean free path” option3=”increasing field strength” option4=”all of the above” correct=”option4″]
Detailed SolutionIonization in circuit breaker is facilitated by
38. The fuse rating is expressed in terms of
[amp_mcq option1=”current” option2=”voltage” option3=”VAR” option4=”kVA” correct=”option1″]
39. When a transmission line is energized, the wave that propagates on it is
[amp_mcq option1=”current wave only” option2=”voltage wave only” option3=”both (A) and (B)” option4=”power factor wave only” correct=”option3″]
Detailed SolutionWhen a transmission line is energized, the wave that propagates on it is
40. By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
[amp_mcq option1=”Radiation” option2=”Convection” option3=”fuse is dissipated ? A. Radiation B. Convection C. Conduction” option4=”All of the above” correct=”option4″]