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This set of Transmission and Distribution of Electrical Energy Multiple Choice Questions & Answers (MCQs) focuses on Transmission And Distribution Of Electrical Energy Set 1
Q1 | By which of the following systems electric power may be transmitted ?
- Overhead system
- Underground system
- Both (a) and (b)
- None of the above
Q2 | are the conductors, which connect the consumer’s terminals to the distribution
- Distributors
- Service mains
- Feeders
- None of the above
Q3 | The underground system cannot be operated above
- 440 V
- 11 kV
- 33 kV
- 66 kV
Q4 | Overhead system can be designed for operation up to
- 11 kV
- 33 kV
- 66 kV
- 400 kV
Q5 | If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as
- Kelvin’s law
- Ohm’s law
- Kirchhoffs law
- Faraday’s law
Q6 | The wooden poles well impregnated with creosite oil or any preservative compound have life
- from 2 to 5 years
- 10 to 15 years
- 25 to 30 years
- 60 to 70 years
Q7 | Which of the following materials is not used for transmission and distribution of electricalpower ?
- Copper
- Aluminium
- Steel
- Tungsten
Q8 | Galvanised steel wire is generally used as
- stay wire
- earth wire
- structural components
- all of the above
Q9 | The usual spans with R.C.C. poles are
- 40—50 meters
- 60—100 meters
- 80—100 meters
- 300—500 meters
Q10 | The corona is considerably affected by which of the following ?
- Size of the conductor
- Shape of the conductor
- Surface condition of the conductor
- All of the above
Q11 | Which of the following are the constants of the transmission lines ?
- Resistance
- Inductance
- Capacitance
- All of the above
Q12 | 310 km line is considered as
- a long line
- a medium line
- a short line
- any of the above
Q13 | The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loadedline is called the
- Seeback effect
- Ferranti effect
- Raman effect
- none of the above
Q14 | The square root of the ratio of line impedance and shunt admittance is called the
- surge impedance of the line
- conductance of the line
- regulation of the line
- none of the above
Q15 | Which of the following is the demerit of a ‘constant voltage transmission system’ ?
- Increase of short-circuit current of the system
- Availability of steady voltage at all loads at the line terminals
- Possibility of better protection for the line due to possible use of higher terminal reactants
- Improvement of power factor at times of moderate and heavy loads
Q16 | The operating voltage of high voltage cables is up to
- l.lkV
- 3.3kV
- 6.6kV
- llkV
Q17 | The operating voltage of supertension cables is up to
- 3.3 kV
- 6.6 kV
- 11 kV
- 33 kV
Q18 | The operating voltage of extra high tension cables is upto
- 6.6 kV
- 11 kV
- 33 kV
- 66 kV
Q19 | Which of the following methods is used for laying of underground cables ?
- Direct laying
- Draw-in-system
- Solid system
- All of the above
Q20 | Which of the following is the source of heat generation in the cables ?
- Dielectric losses in cable insulation
- losses in the conductor
- Losses in the metallic sheathings and armourings
- All of the above
Q21 | Due to which of the following reasons the cables should not be operated too hot ?
- The oil may loose its viscosity and it may start drawing off from higher levels
- Expansion of the oil may cause the sheath to burst
- Unequal expansion may create voids in the insulation which will lead to ionization
- All of the above
Q22 | Which of the following D.C. distribution system is the simplest and lowest in first cost ?
- Radial system
- Ring system
- Inter-connected system
- None of the above
Q23 | A booster is a
- series wound generator
- shunt wound generator
- synchronous generator
- none of the above
Q24 | Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system ?
- Circulating current method
- Thevenin’s theorem
- Superposition of currents
- All of the above
Q25 | Which of the following faults is most likely to occur in cables ?
- Cross or short-circuit fault
- Open circuit fault
- Breakdown of cable insulation
- All of the above