Electrical Generation Transmission And Distribution Mcq PdfBy Jenny M. In and pdf 29.04.2021 at 02:58 5 min read
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- 300+ TOP Transmission & Distribution Objective Questions and Answers
- Power System MCQs with Explanatory Answers
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300+ TOP Transmission & Distribution Objective Questions and Answers
By which of the following systems electric power may be transmitted? 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. The wooden poles well impregnated with creosite oil or any preservative compound have life a from 2 to 5 years b 10 to 15 years c 25 to 30 years d 60 to 70 years Ans: c.
Which of the following materials is not used for transmission and distribution of electrical power? Galvanised steel wire is generally used as a stay wire b earth wire c structural components d all of the above Ans: d.
The usual spans with R. The corona is considerably affected by which of the following? Which of the following are the constants of the transmission lines? The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the a Seeback effect b Ferranti effect c Raman effect d none of the above Ans: b.
The square root of the ratio of line impedance and shunt admittance is called the a surge impedance of the line b conductance of the line c regulation of the line d none of the above Ans: a. Low voltage cables are meant for use up to a l. The operating voltage of high voltage cables is up to a l. The operating voltage of supertension cables is up to a 3. The operating voltage of extra high tension cables is upto a 6. Which of the following methods is used for laying of underground cables?
Which of the following is the source of heat generation in the cables? Due to which of the following reasons the cables should not be operated too hot? Which of the following D. A booster is a a series wound generator b shunt wound generator c synchronous generator d none of the above Ans: a. Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system?
Which of the following faults is most likely to occur in cables? The cause of damage to the lead sheath of a cable is a crystallisation of the lead through vibration b chemical action on the lead when buried in the earth c mechanical damage d all of the above Ans:.
The voltage of the single phase supply to residential consumers is a V b V c V d V Ans: c. Most of the high voltage transmission lines in India are a underground b overhead c either of the above d none of the above Ans: b.
The distributors for residential areas are a single phase b three-phase three wire c three-phase four wire d none of the above Ans: c. The conductors of the overhead lines are a solid b stranded c both solid and stranded d none of the above Ans:.
High voltage transmission lines use a suspension insulators b pin insulators c both a and b d none of the above Ans: a. Multicore cables generally use a square conductors b circular conductors c rectangular conductors d sector-shaped conductors e none of the above Ans: d. Distribution lines in India generally use a wooden poles b R. The material commonly used for insulation in high voltage cables is a lead b paper c rubber d none of the above Ans: b.
The loads on distributors systems are generally a balanced b unbalanced c either of the above d none of the above Ans: b. The power factor of industrial loads is generally a unity b lagging c leading d zero Ans: b.
Overhead lines generally use a copper conductors b all aluminium conductors c A. In transmission lines the cross-arms are made of a copper b wood c R. The material generally used for armour of high voltage cables is a aluminium b steel c brass d copper Ans: b.
Transmission line insulators are made of a glass b porcelain c iron d P. The material commonly used for sheaths of underground cables is a lead b rubber c copper d iron Ans: a. The minimum clearance between the ground and a kV line is about a 4. The spacing between phase conductors of a kV line is approximately equal to a 2 m b 3. Large industrial consumers are supplied electrical energy at a V b 11 kV c 66 kV d kV Ans: c. Transmitted power remaining the same, if supply voltage of a D.
A uniformly-loaded D. As compared to a similar distributor fed at one end only, the drop at the middle point is a one-fourth b one-third c one-half d twice e none of the above Ans: a. As compared to a 2-wire D. Which of the following is usually not the generating voltage? For an overhead line, the surge impedance is taken as a ohms b 70—80 ohms c — ohms d — ohms e none of the above Ans: c. The presence of ozone due to corona is harmful because it a reduces power factor b corrodes the material c gives odour d transfer energy to the ground e none of the above Ans: b.
A feeder, in a transmission system, feeds power to a distributors b generating stations c service mains d all of the above Ans: a.
The power transmitted will be maximum when a corona losses are minimum b reactance is high c sending end voltage is more d receiving end voltage is more Ans: c. A 3-phase 4 wire system is commonly used on a primary transmission b secondary transmission c primary distribution d secondary distribution Ans: d. Which of the following materials is used for overhead transmission lines? Which of the following is not a constituent for making porcelain insulators? There is a greater possibility of occurence of corona during a dry weather b winter c summer heat d humid weather e none of the above Ans: d.
Which of the following relays is used on long transmission lines? The steel used in steel cored conductors is usually a alloy steel b stainless steel c mild steel d high speed steel e all of the above Ans: c. Which of the following distribution systems is more reliable? Which of the following characteristics should the line supports for transmission lines possess? Transmission voltage of ll kV is normally used for distances upto a 20—25 km b 40—50 km c 60—70 km d 80— km Ans: a.
Which of the following regulations is considered best? Skin effect is proportional to a conductor diameter b conductor diameter c conductor diameter d conductor diameter e none of the above Ans: c. A conductor, due to sag between two supports, takes the form of a semi-circle b triangle c ellipse d catenary Ans: d. In AC. Which of the following bus-bar schemes has the lowest cost? By which of the following methods string efficiency can be improved? In aluminium conductors, steel core is provided to a compensate for skin effect b neutralise proximity effect c reduce line inductance d increase the tensile strength Ans: d.
By which of the following a bus-bar is rated? A circuit is disconnected by isolators when a line is energized b there is no current in the line c line is on full load d circuit breaker is not open Ans: b. For which of the following equipment current rating is not necessary?
In a substation the following equipment is not installed a exciters b series capacitors c shunt reactors d voltatre transformers Ans: a. The voltage drop, for constant voltage transmission is compensated by installing a inductors b capacitors c synchronous motors d all of above e none of the above Ans: c.
The use of strain type insulators is made where the conductors are a dead ended b at intermediate anchor towers c any of the above d none of the above Ans: c. The current drawn by the line due to corona losses is a non-sinusoidal b sinusoidal c triangular d square Ans: a. Pin type insulators are generally not used for voltages beyond a 1 kV b 11 kV c 22 kV d 33 kV Ans: d.
Aluminium has a specific gravity of a 1. For transmission of power over a distance of km, the transmission voltage should be a kV b 66 kV c 33 kV d 11 kV Ans: a. For aluminium, as compared to copper, all the following factors have higher values except a specific volume 6 electrical conductivity c co-efficient of linear expansion d resistance per unit length for same cross-section Ans: b.
Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical? In a tap changing transformer, the tappings are provided on a primary winding b secondary winding c high voltage winding d any of the above Ans: c. Constant voltage transmission entails the following disadvantage a large conductor area is required for same power transmission b short-circuit current of the system is increased c either of the above d none of the above Ans: b.
On which of the following factors skin effect depends? The effect of corona can be detected by a presence of ozone detected by odour b hissing sound c faint luminous glow of bluish colour d all of the above Ans: d. For transmission of power over a distance of km, the transmission voltage should be in the range a to kV b to kV c 60 to kV d 20 to 50 kV Ans: a. In the analysis of which of the following lines shunt capacitance is neglected? The frequency of voltage generated, in case of generators, can be increased by a using reactors b increasing the load c adjusting the governor d reducing the terminal voltage e none of the above Ans: c.
When an alternator connected to the bus-bar is shut down the bus-bar voltage will a fall b rise c remain unchanged d none of the above Ans: c. The angular displacement between two interconnected stations is mainly due to a armature reactance of both alternators b reactance of the interconnector c synchronous reactance of both the alternators d all of the above Ans: a.
Electro-mechanical voltage regulators are generally used in a reactors b generators c transformers d all of the above Ans: b. Series capacitors on transmission lines are of little use when the load VAR requirement is a large b small b fluctuating d any of the above Ans: b. The voltage regulation in magnetic amplifier type voltage regulator is effected by a electromagnetic induction b varying the resistance c varying the reactance d variable transformer Ans: c.
When a conductor carries more current on the surface as compared to core, it is due to a permeability variation b corona c skin effect d unsymmetrical fault e none of the above Ans: c. The following system is not generally used a 1-phase 3 wire b 1-phase 4 wire c 3-phase 3 wire d 3-phase 4 wire Ans: a. The skin effect of a conductor will reduce as the a resistivity of conductor material increases b permeability of conductor material increases c diameter increases d frequency increases Ans: a.
When a live conductor of public electric supply breaks down and touches the earth which of the following will happen? Please send me all questions Pradeepsawant96 gmail. Provide me transmission and distiburation and genration of electicity objectives question ans. Email id — pintu. Your email address will not be published.
The wooden poles well impregnated with creosite oil or any preservative compound have life a from 2 to 5 years b 10 to 15 years c 25 to 30 years d 60 to 70 years Ans: c 7. Galvanised steel wire is generally used as a stay wire b earth wire c structural components d all of the above Ans: d 9.
Power System MCQs with Explanatory Answers
MCQ No - 1. Which of the following are the constants of the transmission lines? A Inductance. B Capacitance. C Resistance. D All of the above. Answer D.
Power Transmission and Distribution Questions and Answers PDF Dowload
Follow by Email. Which of the following is not the transmission voltage in America? A 66 kV Like Page.
By which of the following systems electric power may be transmitted? 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. The wooden poles well impregnated with creosite oil or any preservative compound have life a from 2 to 5 years b 10 to 15 years c 25 to 30 years d 60 to 70 years Ans: c. Which of the following materials is not used for transmission and distribution of electrical power?
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