1.A 3-phase 4-wire system is commonly used for
Explain:- A 3-phase 4-wire system is commonly used for Secondary Distribution.
2.The rated voltage of a 3-phase power is given as
Explain:- The rated voltage of a 3-phase power is given as RMS line to line voltage.
3.The networks in which the R, L, C parameters are individually concentrated or lumped at discrete points in the circuit are called
Explain:- The networks in which the R, L, C parameters are individually concentrated or lumped at discrete points in the circuit are called lumped networks. These networks can be identified definitely as representing a particular parameter. An example is the filters.
4.Which primary parameter is uniformly distributed along the length of the conductor?
Explain:- The resistance is a primary parameter that is uniformly distributed along the length of the conductor. It depends on the cross section area and the length of the conductor
5.The primary parameter that is associated with the magnetic flux linkage is
Explain:- When the conductors carry current, the conductor will be surrounded and linked by magnetic flux. The flux linkages per ampere of current gives rise to the effect of inductance. It is denoted by L. OR Conductors separated by insulating dielectrics in order to store electric charges, gives rise to the capacitance effect. The capacitance is distributed in the whole conductor length.
6.Single line diagram of which of the following power system is possible?
Explain:- Only balanced power system can be represented by a single line diagram. Single line diagram is drawn on per phase basis. A power system with LLG, LG and LL faults becomes unbalanced and can not be represented in per phase basis.
7. Single line diagram does not represents:
Explain:- Single line diagram is a representation of balanced power system on per phase basis with neutral eliminated. Neutral wire is not shown in single line diagram. Winding connections (star or neutral) is represented beside the symbol of transformer with its Impidance and rating.
8. For a given power system, its zero and maximum regulation will occur at the impedance angle of
9. A protection system engineer is planning to provide the complete protection, he can achieve this by ___________
Explain:- For the complete protection of the power system, one can use 3 phase fault relays and two earth fault relays so that to cover the entire zone of operation.
10. The area under the load curve represents ____________
Explain:- Load curve is obtained by plotting fluctuating load be keeping load on y axis and time in x axis. The area under the load curve represents the total number of units generated in a particular time.
11. The presence of Ozone due to corona is harmful because of
12. Which of the following is not a constituent for making porcelain insulators?
13.Multicore cables generally are
14. If δ is the loss angle of the cable, its power factor is
Explain:-
