Cables Mcqs – (Electrical Engineering) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
“ Cables Mcqs “. Tab this page to check “Latest Cables MCQs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Cables in past papers. Past papers of Cables mcqs. Past papers of Cables MCQs. Mcqs are the necessary part of any competitive / job related exams. The Cables mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Cables mcqs. The Important series of Cables Mcqs are given below:
Which of the following insulation is used in cables ?
A. Rubber
B. Varnished cambric
C. Paper
D. Any of the above
The thickness of the layer of insulation on the conductor, in cables, depends upon___________?
A. power factor
B. reactive power
C. voltage
D. current carrying capacity
The insulating material for a cable should have__________?
A. high dielectric strength
B. low cost
C. high mechanical strength
D. all of the above
Which of the following protects a cable against mechanical injury___________?
A. Sheath
B. Bedding
C. Armouring
D. None of the above
Empire tape is__________?
A. varnished cambric
B. impregnated paper
C. vulcanised rubber
D. none of the above
In a cable immediately above metallic sheath ______ is provided
A. armouring
B. bedding
C. earthing connection
D. none of the above
The bedding on a cable consists of____________?
A. jute
B. hessian cloth
C. any of the above
D. none of the above
cables are used for 132 kV lines____________?
A. Super tension
B. High tension
C. Extra high tension
D. Extra super voltage
The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to__________?
A. absence of ripples
B. non-existence of any stability limit
C. smaller dielectric loss
D. absence of harmonics
E. none of the above
The insulating material for cables should____________?
A. be non-inflammable
B. be acid proof
C. be non-hygroscopic
D. have all above properties
In single core cables armouring is not done to________?
A. avoid excessive sheath losses
B. make it flexible
C. either
D. none
In case of three core flexible cable the colour of the neutral is_________?
A. blue
B. brown
C. black
D. none of the above
In a cable, the maximum stress under operating conditions is at___________?
A. sheath
B. insulation layer
C. armour
D. conductor surface
Dielectric strength of rubber is around____________?
A. 15 kV/mm
B. 5 kV/mm
C. 30 kV/mm
D. 200 kV/mm
High tension cables are generally used up to_____________?
A. 11kV
B. 66 kV
C. 33kV
D. 132 kV
Low tension cables are generally used up to___________?
A. 500 V
B. 200 V
C. 700 V
D. 1000 V
Cables, generally used beyond 66 kV are___________?
A. oil filled
B. belted
C. S.L. type
D. armoured
In the cables, the location of fault is usually found out by comparing____________?
A. the inductance of conductors
B. the resistance of the conductor
C. the capacitances of insulated conductors
D. all above parameters
The minimum dielectric stress in a cable is at_____________?
A. bedding
B. armour
C. conductor surface
D. lead sheath
The surge resistance of cable is__________?
A. 20 ohms
B. 5 ohms
C. 50 ohms
D. 100 ohms
In capacitance grading of cables we use a _______ dielectric?
A. porous
B. composite
C. homogeneous
D. hygroscopic
PVC stands for____________?
A. polyvinyl chloride
B. pressed and varnished cloth
C. post varnish conductor
D. positive voltage conductor
E. none of the above
Conduit pipes are normally used to protect _______ cables
A. unsheathed cables
B. PVC sheathed cables
C. armoured
D. all of the above
The material for armouring on cable is usually__________?
A. galvanised steel wire
B. steel tape
C. any of the above
D. none of the above
The relative permittivity of rubber is____________?
A. between 2 and 3
B. between 8 and 10
C. between 5 and 6
D. between 12 and 14
Pressure cables are generally not used beyond__________?
A. 33 kV
B. 11 kV
C. 66 kV
D. 132 kV
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
B. four times
C. double
D. none of the above
Solid type cables are considered unreliable beyond 66 kV because___________?
A. insulation may melt due to higher temperature
B. of corona loss between conductor and sheath material
C. skin effect dominates on the conductor
D. there is a danger of breakdown of insulation due to the presence of voids
In cables the charging current__________?
A. lags the voltage by 180°
B. leads the voltage by 90°
C. lags the voltage by 90°
D. leads the voltage by 180°
If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?
A. 15 kV/mm
B. 10 kV/mm
A. 5 kV/mm
D. 30 kV/mm
The intersheaths in the cables are used to_____________?
A. avoid the requirement of good insulation
B. minimize the stress
C. provide proper stress distribution
D. none of the above
The breakdown of insulation of the cable can be avoided economically by the use of___________?
A. insulating materials with different dielectric constants
B. inter-sheaths
C. both (A) and (B)
D. none of the above
In the cables, sheaths are used to___________?
A. prevent the moisture from entering the cable
B. provide proper insulation
E. provide enough strength
D. none of the above
If the length of a cable is doubled, its capacitance____________?
A. becomes one-half
B. becomes one-fourth
C. becomes double
D. remains unchanged
The metallic sheath may be made of lead or lead alloy or of aluminium ?
A. No
B. Yes
It is difficult to maintain oil filled cables____________?
A. Yes
B. No
In congested areas where excavation is expensive and inconvenient ‘draw in system’ of laying of underground cables is often adopted
A. Yes
B. No
Polyethylene has very poor dielectric and ageing properties
A. Yes
B. No
Natural rubber is obtained from milky sap of tropical trees
A. Yes
B. No
In capacitance grading a homogeneous dielectric is used
A. Yes
B. No
Rubber is most commonly used insulation in cables
A. Yes
B. No
The disadvantage with paper as insulating material is____________?
A. it is hygroscopic
B. it is an organic material
C. it has high capacitance
D. none of the above
The insulating material should have____________?
A. high resistivity
B. low permittivity
C. high dielectric strength
D. all of the above
If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________?
A. 10 cm
B. 2 cm
C. 50 cm
D. 400 cm
Cables for 220 kV lines are invariably____________?
A. paper insulated
B. mica insulated
C. compressed oil or compressed gas insulated
D. rubber insulated
E. none of the above
Copper as conductor for cables is used as________?
A. annealed
B. hard drawn
C. hardened and tempered
D. alloy with chromium
The advantage of oil filled cables is_________?
A. smaller overall size
B. more perfect impregnation
C. no ionisation, oxidation and formation of voids
D. all of the above
The breakdown voltage of a cable depends on_____________?
A. working temperature
B. presence of moisture
C. time of application of the voltage
D. all of the above
The thickness of metallic shielding on cables is usually_______________?
A. 0.04 mm
B. 3 to 5 mm
E. 0.2 to 0.4 mm
D. 40 to 60 mm
Underground cables are laid at sufficient depth___________?
A. to avoid being unearthed easily due to removal of soil
B. to minimise temperature stresses
C. to minimize the effect of shocks and vibrations due to gassing vehicles, etc
D. for all of the above reasons
The electrostatic stress in underground cables is_________?
A. zero at the conductor as well as on the sheath
B. minimum at the conductor and maximum at the sheath
C. maximum at the conductor and minimum at the sheath
D. same at the conductor and the sheath
E. none of the above
A cable carrying alternating current has__________?
A. hysteresis, leakage and copper losses only
B. hysteresis and leakage losses only
C. hysteresis losses only
D. hysteresis, leakage, copper and friction losses
Capacitance grading of cable implies__________?
A. use of dielectrics of different permeabilities
B. cables using single dielectric in different concentrations
C. grading according to capacitance of cables per km length
D. capacitance required to be introduced at different lengths to counter the effect of inductance
E. none of the above
The advantage of cables over overhead transmission lines is___________?
A. low cost
B. easy maintenance
C. can be used in congested areas
D. can be used in high voltage circuits
Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ____________?
A. Vulcanised rubber
B. Polyvinyle chloride
C. Impregnated paper
D. Compressed SFe gas
E. none of the above
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
D. none
In a cable the voltage stress is maximum at____________?
A. insulator
B. sheath
E. surface of the conductor
D. core of the conductor