PVC stands for (a) polyvinyl chloride (b) post varnish conductor (c) pressed and varnished cloth (d) positive voltage conductor (e) none of the above

PVC stands for (a) polyvinyl chloride (b) post varnish conductor (c) pressed and varnished cloth (d) positive voltage conductor (e) none of the above
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(a) polyvinyl chloride
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the classification of cables. (i) According with voltage levels. (ii) According to numbers of core.

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In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres. (A) Polythene (B) PVC (C) Rayon (D) Polyvinyl acetate

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Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk

Description : Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk

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Cables for 220 kV lines are invariably (a) mica insulated (b) paper insulated (c) compressed oil or compressed gas insulated (d) rubber insulated (e) none of the above

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Last Answer : (c) compressed oil or compressed gas insulated

The thickness of metallic shielding on cables is usually (a) 0.04 mm (b) 0.2 to 0.4 mm (e) 3 to 5 mm (d) 40 to 60 mm

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Last Answer : (a) 0.04 mm

Capacitance grading of cable implies (a) use of dielectrics of different permeabilities (b) grading according to capacitance of cables per km length (c) cables using single dielectric in different concentrations (d) capacitance required to be introduced at different lengths to counter the effect of inductance (e) none of the above

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Last Answer : (a) use of dielectrics of different permeabilities

In the cables, sheaths are used to (a) prevent the moisture from entering the cable (b) provide enough strength (e) provide proper insulation (d) none of the above

Description : In the cables, sheaths are used to (a) prevent the moisture from entering the cable (b) provide enough strength (e) provide proper insulation (d) none of the above

Last Answer : (a) prevent the moisture from entering the cable

The current carrying capacity of cables in D.C. is more that in A.C. mainly due to (a) absence of harmonics (b) non-existence of any stability limit (c) smaller dielectric loss (d) absence of ripples (e) none of the above

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Last Answer : (c) smaller dielectric loss

PVC stands for (A) Plastic very compact (B) Polythene vinyl chloride (C) Polythene vinyl carbon (D) Polythene vanadium carbide

Description : PVC stands for (A) Plastic very compact (B) Polythene vinyl chloride (C) Polythene vinyl carbon (D) Polythene vanadium carbide

Last Answer : Answer: Option B

What is the type cable used in radiation areas?

Description : What is the type cable used in radiation areas?

Last Answer : Mineral insulated (MI) cables. 

Why bimetallic washers provided in aluminium copper transition joints?

Description : Why bimetallic washers provided in aluminium copper transition joints?

Last Answer : To avoid galvanic corrosion failure.  

Why 1.1 kV grade cables used for 415V?

Description : Why 1.1 kV grade cables used for 415V?

Last Answer : To take care of the both earthed / unearthed systems.  

What are the types of cables used in 6.6 kV and 415 V system voltages?

Description : What are the types of cables used in 6.6 kV and 415 V system voltages? 

Last Answer : In 6.6 kV system AC (unearthed) grade having stranded aluminium conductors cables are used. Their insulation's are as follows. 1. XLPE - Crossed linked polyethylene insulation. 2. FRLS PVC - Fire ... V grade copper or aluminium stranded cables are used. Their insulations are HR PVC and FS type. 

Why armouring done?

Description : Why armouring done?

Last Answer : For mechanical strength, protect against damage by impact of an object.  

How armours /sheaths grounded?

Description : How armours /sheaths grounded? 

Last Answer : 1 core cables -- sheaths/shields/armours grounded at one end only, other end insulated to prevent the circulating current through sheaths. 3 core cables -- grounded at both ends but not including core balance CT’s, since even small induced current causes 50N operation. 

What is the specified cable life?

Description : What is the specified cable life? 

Last Answer : 50 years.  

What are the advantages of XLPE?

Description : What are the advantages of XLPE? 

Last Answer : a. Easy routing at heights b. Easy maintenance c. Large current (90 ºC) d. No sheath (no fatigue) e. No paper tape wrapping technique f. High dielectric strength g. Very little deformation ... i. Low tan delta and hence suits long routes j. Very light k. Good mechanical properties. 

What are the disadvantages of paper insulation?

Description : What are the disadvantages of paper insulation? 

Last Answer : a. Absorbs moisture. b. Cable termination/sealing problems. 

What are the purposes of cable trays?

Description : What are the purposes of cable trays? 

Last Answer : a. Avoid sagging of cables b. Give mechanical support 

The metallic sheath may be made of lead or lead alloy or of aluminium. (a) Yes (b) No

Description : The metallic sheath may be made of lead or lead alloy or of aluminium. (a) Yes (b) No

Last Answer : (b) No