Virtual Labs

Monitoring Feeder parameter from workstation

The maximum generated voltage in power generating stations in advanced countries is 33kV while that in India is _________

a: 6 kV Explanation

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b: 9 kV Explanation

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c: 11 kV Explanation

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d: 44 kV Explanation

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The transmission lines and feeders are _____________ .

a: 2-phase 2-wire circuit Explanation

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b: 3-phase 3-wire circuit Explanation

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c: Both 2-phase 2-wire circuit and 3-phase 3-wire circuit Explanation

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d: None Explanation

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The transmission lines are _____________

a: 3-phase 4-wire circuits Explanation

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b: 2-phase 2-wire circuits Explanation

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c: 3-phase 3-wire circuits Explanation

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d: None Explanation

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________ are lines conductors which connect the distribution substations to the areas, to be fed by those distribution substations.

a: Service mains Explanation

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b: Distributors Explanation

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c: Feeders Explanation

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d: None Explanation

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________ are the terminals which connect the consumer's terminals to the distributors

a: Service mains Explanation

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b: Distributors Explanation

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c: Feeders Explanation

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d: None Explanation

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In AC-system ,

a: Electric power can be generated at high voltage Explanation

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b: Stepping-up and stepping down of an AC voltage can be done easily and efficiently with the help of transformers Explanation

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c: Transformer line construction is comparatively difficult and the amount of copper required is comparatively more Explanation

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d: All Explanation

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In AC system,

a: There is a need to synchronize the alternators before they are put in parallel Explanation

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b: As a result of skin effect, the resistance of the line is increased Explanation

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c: In order to avoid corona loss and also to provide adequate amount of insulation in case of overhead lines, more spacing between the conductors is required Explanation

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d: All Explanation

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Statement 1:- The best method is to use AC system for generation and distribution purpose and DC system for transmission purpose.
Statement 2:- The best method is to use DC system for generation and distribution purpose and AC system for transmission purpose.

a: Statement 1 is true and Statement 2 is false Explanation

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b: Statement 1 is false and Statement 2 is false Explanation

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c: Statement 1 is false and Statement 2 is true Explanation

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d: Statement 1 is false and Statement 2 is false Explanation

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Underground cables are rarely used for

a: Detection of fault is tough Explanation

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b: Installation costs are very high Explanation

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c: More suitable for short distance Explanation

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d: All Explanation

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Important component of overhead lines is

a: Conductors Explanation

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b: Supports and cross-arms Explanation

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c: Insulators Explanation

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d: All Explanation

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The characteristics that conductors used for transmission and distribution should posses :

a: High tensile strength and low sensitivity Explanation

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b: Low specific gravity Explanation

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c: Low cost Explanation

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d: All Explanation

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Hard drawing of copper __________ electrical conductivity by small amount but it ___________ the tensile strength considerably.

a: Increases, decreases Explanation

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b: Decreases, increases Explanation

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c: Both Increases, decreases and Decreases, increases in some cases Explanation

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d: None Explanation

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Copper conductor is

a: Homogenous material Explanation

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b: Highly durable and has high scrap value Explanation

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c: It has high current density, so lesser X-sectional area of conductor is required Explanation

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d: All Explanation

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Aluminium is ______________ in weight as compared to copper, but has _________ conductivity and tensile strength.

a: Heavier, Smaller Explanation

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b: Heavier, Greater Explanation

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c: Lighter, Greater Explanation

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d: Lighter, Smaller Explanation

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The sag in aluminium conductors is __________ the copper conductors.

a: Lesser than Explanation

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b: Equal to Explanation

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c: Greater than Explanation

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d: 2 times lesser than Explanation

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The advantages of using aluminium conductors steel reinforced over aluminium conductor is ________

a: Tensile strength is increased Explanation

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b: Skin effect is greatly increased Explanation

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c: Both Tensile strength is increased and Skin effect is greatly increased Explanation

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d: None of the above Explanation

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Choose the proper set of increases order of mechanical strength of the following line supports :

a: Wooden poles > steel poles > steel towers > R.C.C poles Explanation

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b: Wooden poles > steel towers > steel poles > R.C.C poles Explanation

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c: Wooden poles > steel poles >R.C.C poles > steel towers Explanation

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d: Wooden poles > R.C.C poles >steel poles > steel towers Explanation

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Characteristics of an insulator used in overhead lines are

a: It should have high electric strength Explanation

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b: High ratio of rapture strength to flash over voltage Explanation

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c: High mechanical strength Explanation

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d: All Explanation

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A good porcelain insulator has compressive strength of about _________ and dielectric strength of _________ of its thickness.

a: 70 N/m² , 6kV/cm Explanation

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b: 700 N/m² , 6kV/cm Explanation

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c: 7000 N/m² , 6kV/cm Explanation

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d: 7000 N/m² , 60kV/cm Explanation

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Glass insulators, can be used up to _________ under normal atmospheric conditions, and in dry atmosphere, it can be used up to __________.

a: 2.5kV, 5kV Explanation

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b: 2.5kV,250kV Explanation

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c: 25kV, 250kV Explanation

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d: 25kV, 50kV Explanation

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Steatite is produced by mixing ___________ with small proton of ________ and ___________.

a: Hydrated magnesium silicate,carbon,nitrogen Explanation

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b: Hydrated magnesium silicate,carbon,clay Explanation

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c: Hydrated magnesium silicate,nitrogen,clay Explanation

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d: Hydrated magnesium silicate, clay, felspar Explanation

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In a pin type insulator,

a: Insulators made of glass are generally used for low voltages Explanation

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b: Insulators made of poralain can be used up to a 90kv but are rarely used on lines above 60kV Explanation

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c: Both Insulators made of glass are generally used for low voltages and Insulators made of poralain can be used up to a 90kv but are rarely used on lines above 60kV Explanation

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d: None of the above Explanation

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The factor affecting the sag in overhead lines are

a: Weight of the conductor Explanation

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b: Span length Explanation

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c: Temperature Explanation

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d: All Explanation

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Due to skin effect, the total resistance of the conductor _________, as the frequency of the current ________ and also with the increases in the diameter of the conductor.

a: Increases ,Increases ,Increases Explanation

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b: Decreases ,Increases ,Decreases Explanation

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c: Increases ,Decreases ,Increases Explanation

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d: None Explanation

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The skin effect is negligible when the supply frequency is ________ and the conductor diameter is _________.

a: High, Large Explanation

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b: High, Small Explanation

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c: Low ,Small Explanation

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d: Low ,Large Explanation

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The alternating magnetic flues in a conductor caused by the current flowing in a neighbouring conductor gives rise to circulating currents which cause an apparent increases in the resistance of the conductor. This phenomena is called ________ .

a: Skin effect Explanation

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b: Corona effect Explanation

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c: Proximity effect Explanation

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d: None Explanation

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The factor which effect skin and proximity effects are ______________

a: Frequency of the current Explanation

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b: Permeability of the conductor material Explanation

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c: Size of the conductor and distance between the conductors Explanation

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d: All Explanation

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Usually in short transmission lines ___________

a: Length is less than 50km Explanation

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b: Operating voltage is less than 20kV Explanation

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c: Both Length is less than 50km and Operating voltage is less than 20kV Explanation

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d: None of the above Explanation

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In medium transmission lines

a: Length is between 50 km and 160km Explanation

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b: Operating voltage is between 21kV and 100kV Explanation

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c: Both Length is between 50 km and 160km and Operating voltage is between 21kV and 100kV Explanation

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d: None Explanation

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In long transmission lines

a: Length is more than 160km Explanation

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b: Operating voltage is above 100kV Explanation

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c: Both Length is more than 160km and Operating voltage is above 100kV Explanation

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d: None Explanation

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