Description : The insulation of the cable decreases with (a) the increase in length of the insulation (b) the decrease in the length of the insulation (c) either (a) or (b) (d) none of the above
Last Answer : (a) the increase in length of the insulation
Description : If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be
Last Answer : If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be 0.2 mega ohm
Description : A cylindrical cable of core radius 1.25cm and impregnated paper insulation of thickness 2.13cm and relative permittivity 3.5. Compute the capacitance of the cable/km (in nF
Last Answer : To calculate the capacitance of the cable per kilometer, you can use the following formula: C = ε * ε0 * A / d where: C is the capacitance of the cable per kilometer (in farads) ε is ... * 10^9 = 644 nF/km So the capacitance of the cable per kilometer would be approximately 644 nanofarads.
Description : Which of the following statements concerning electrical cables is correct? A. Where they pass through watertight bulkheads, they should be fitted with watertight stuffing boxes. B. Electric cable coverings should ... , or glued in place where nonmetallic insulation is used. D. All of the above.
Last Answer : Answer: A
Description : What is used as insulation for PILC cable?
Last Answer : Impregnated paper.
Description : A cable of core radius 1.25cm and impregnated paper insulation of thickness 2.13cm and relative permittivity 3.5. Compute the capacitance of the cable/km(in nF) a) 195.7 b) 179.5 c) 157.9 d) 197.5
Last Answer : a) 195.7
Description : Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ? (a) Polyvinyle chloride (b) Vulcanised rubber (c) Impregnated paper (d) Compressed SFe gas (e) none of the above
Last Answer : (d) Compressed SFe gas
Description : The breakdown of insulation of the cable can be avoided economically by the use of (a) inter-sheaths (b) insulating materials with different dielectric constants (c) both (a) and (b) (d) none of the above
Last Answer : (c) both (a) and (b)
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
Description : If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be (a) 5 kV/mm (b) 10 kV/mm (a) 15 kV/mm (d) 30 kV/mm
Last Answer : (b) 10 kV/mm
Description : A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become (a) one half (6) double (c) four times (d) none of the above
Last Answer : (a) one half
Description : In a cable, the maximum stress under operating conditions is at (a) insulation layer (b) sheath (c) armour (d) conductor surface
Last Answer : (d) conductor surface
Description : What materials are commonly used as cushions between cable insulation and metallic armor?
Last Answer : Jute and Asphalt coverings.
Description : The core of fiber-optic cable is surrounded by ∙ A. wire braid shield ∙ B. Keviar ∙ C. cladding ∙ D. plastic insulation
Last Answer : ∙ C. cladding
Description : The ‘sheath’ is used in cable to (A) provide strength to the cable. (B) provide proper insulation. (C) prevent the moisture from entering the cable. (D) avoid chances of rust on strands.
Last Answer : Ans: A The sheath in underground cable is provided to give mechanical strength.
Description : A cable has an insulation of relative permittivity 2. If the insulation is replaced by one of relative permittivity 4, then capacitance of the cable (a) is doubled (b) is halved (c) remains unchanged (d) is reduced
Last Answer : B
Description : In a 3-phase extra-high voltage cable, a metallic screen around each core insulation is provided to (a) Facilitate heat dissipation (b) Give mechanical strength (c) Obtain longitudinal electric stress (d) Obtain radial electric stress
Last Answer : In a 3-phase extra-high voltage cable, a metallic screen around each core insulation is provided to Give mechanical strength
Description : A megger is to measure insulation resistance of a cable. The cable should be connected to (a) Battery (b) DC supply (c) AC supply (d) No supply
Last Answer : majorly in DC as well as AC......but ans is Battery
Last Answer : In RE cable the insulation resistance will be above 20 mega ohms.
Description : What is the Water Regulations the maximum permissible length of dead leg without insulation from the top of a hot water cylinder to the outlet tap for a 22mm pipe?
Last Answer : 8m
Description : What is the Water Regulations the maximum permissible length of dead leg without insulation from the top of a hot water cylinder to the outlet tap for a 22mm pipe i?
Description : The existing resistance of a conductor is dependent upon its length, cross-sectional area, _____________. A. temperature and insulation B. material and insulation C. resistive coefficient and material D. material and temperature
Last Answer : Answer: D
Description : A horizontal load of 120 kg/mt is to be carried by a cable suspended between supports at same level and 60 mts apart. If the maximum permissible tension is 36,000 kg the required length of cable is a.63.3 mets b.62.5 mts c.60.8 mts d.107 dynes e.60.1 mts
Last Answer : e. 60.1 mts
Description : What is the strain in a cable of original length 50m whose length increases by 2.5cm when a load is lifted?
Last Answer : What is the strain in a cable of original length 50m whose length increases by 2.5cm when a load is lifted?
Description : Which of the following characteristics is most critical in determining the size of the cable to be used in a particular circuit? A. voltage rating B. weight per unit length C. current rating D. inductance per unit length
Last Answer : Answer: C
Description : Which of the cable length has the highest attenuation? a. 1 km b. 2 km c. 95 ft d. 5500 ft
Last Answer : b. 2 km
Description : Why is the physical length of a coaxial cable transmission line shorter than its electrical length? A. Skin effect is less pronounced in the coaxial cable B. RF energy moves slower along the ... higher in the parallel feed line D. The characteristic impedance is higher in the parallel feed line
Last Answer : B. RF energy moves slower along the coaxial cable
Description : Determine the maximum length of the cable (in km) for transmitting data at a rate of 500 Mbps in an Ethernet LAN with frames of size 10,000 bits. Assume the signal speed in the cable to be 2,00,000 km/s. b. 2 c. 2.5 d. 5
Last Answer : b. 2
Description : The maximum length of a "thick" Ethernet cable is ……….. A. 100 meters B. 200 meters C. 500 meters D. 1000meters
Last Answer : C. 500 meters
Description : 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 ... introduced at different lengths to counter the effect of inductance (e) none of the above
Last Answer : (a) use of dielectrics of different permeabilities
Description : If the length of a cable is doubled, its capacitance (a) becomes one-fourth (b) becomes one-half (c) becomes double (d) remains unchanged
Last Answer : (c) becomes double
Description : Which cable length has the highest attenuation? ∙ A. 1 km ∙ B. 2 km ∙ C. 95 ft. ∙ D. 500 ft.
Last Answer : B. 2 km
Description : Which of the cable length has the highest attenuation? ∙ a. 1 km ∙ b. 2 km ∙ c. 95 ft ∙ d. 5500 ft
Last Answer : ∙ b. 2 km
Description : A simple cabling method, known as the..................topology allows about 30 computers on a maximum cable length of about 600 feet. A) Ring B) Bus C) Star D) Mesh
Last Answer : Bus
Description : A simple cabling method, known as the ……………… topology allows about 30 computers on a maximum cable length of about 600 feet. A) Ring B) Bus C) Star D) Mesh
Last Answer : B) Bus
Description : In air-core cable the surge voltage travels approximately at the speed of light and a cable of 100m length gives a delay of a. 0.666μsec b. 0.333μsec c. 1.555μsec d. 1μsec
Last Answer : In air-core cable the surge voltage travels approximately at the speed of light and a cable of 100m length gives a delay of a. 0.666μsec b. 0.333μsec c. 1.555μsec d. 1μsec