HSSC JE Electrical 2018 Questions
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Attempt Free HSSC JE Electrical 2018 Questions Here. Read The Important Electrical MCQ From Below.
Haryana Staff Selection Commission (HSSC) Junior Engineer(JE) Electrical 2018 Questions With YouTube Explanation & PDF Part One
HSSC JE Electrical 2018 Questions
Question-1.Long distance railways operate on
(1) 600 V dc.
(2) 25 kV single phase ac.
(3) 25 kV three phase ac.
(4) 15 kV three phase ac.
Answer-2
Explanation-Railway electrification systems using alternating current (AC) at 25 kilovolts (kV) are used worldwide, especially for high-speed rail and long distance.
HSSC JE Electrical 2018 Questions
Question-2.The speed-time curve for urban service has no
(1) coasting period
(2) free running period
(3) breaking period
(4) acceleration period
Answer-2
Explanation-Urban Service or City Service
• In this service the distance between the stops is comparatively very short. (say 1 km or so)
• Time required for this run is very small.
• The acceleration as well as retardation is required to be high so that high average speed and short time run is obtained.
• Free run is not possible.
• Coasting period is also small.
Speed–Time curve for Urban Service
HSSC JE Electrical 2018 Questions
Question-3.The normal value of co-efficient of adhesion is
(1) 0.25
(2) 0.30
(3) 0.50
(4) 0.65
Answer-3
Explanation-
Coefficient of Adhesion in Traction (μa)=Maximum tractive effort that can be applied without slipping of wheels/Weight on driving excel
Normal value of co-efficient of adhesion is 0.25
Question-4.The voltage required to pass the necessary current through an electrolytic cell is of the order of
(1) 1-2 V
(2) 100-120 V
(3) 10-20 V
(4) 150-200 V
Answer-3
Explanation-The voltage required to pass the necessary current through an electrolytic cell is of the order of 10-20 V.
Question-5.What is the maximum load that is usually connected in a power sub-circuit
(1) 1000 W
(2) 2000 W
(3) 3000 W
(4) 4000 W
Answer-3
Explanation-Power sub-circuit-The load connected in a power sub-circuit normally should not exceed 3,000 watts and the number of outlasts connected on each sub circuit in no case should exceed two.
HSSC JE Electrical 2018 Questions
Single phase 15A sub-circuits (power sub-circuits) are used for connecting heaters, stoves, electric iron, small single phase motors etc.
Question-6.What type of starter will you recommend for a 20 kW squirrel cage induction motor
(1) Auto-transformer starter
(2) D-O-L starter
(3) Star-delta starter
(4) 3-point starter
Answer-1
Explanation-An Auto transformer Starter is suitable for a 20 kW squirrel cage induction motor.
Question-7.Compensating winding is used to
(1) Improve commutation
(2) Reduce armature reaction
(3) Reduce stray losses
(4) Improve look of machine.
Answer-2
Explanation-In order to neutralize the cross magnetizing effect of armature reaction, a compensating winding is used.
HSSC JE Electrical 2018 Questions
Question-8. _________ is cause of failure to build up voltage.
(1) No residual magnetism
(2) Actual field connections
(3) Less resistance
(4) High field current
Answer- 1
Explanation-Cause of failure to build up voltage in generator
- No residual magnetism of field
- Open field connection
- Field connection reversed
- Field circuit resistance too high
Question-9. __________ is done to improve efficiency and reliability of dc generator.
(1) Series operation
(2) Parallel operation
(3) Compound operation
(4) Load forecasting
Answer- 1
Explanation-Parallel operation is done to improve efficiency and reliability of dc generator.
HSSC JE Electrical 2018 Questions
Question-10.V curve is a graph of
(1) Armature voltage, Field current
(2) Field voltage, Field current
(3) Armature current, Field current
(4) Field voltage, Armature current
Answer-3
Explanation-V curve is a graph of Armature current and Field current.
Question-11.Thyristor is a __________ Layer and __________ Terminal semi-conductor device.
(1) 3, 3
(2) 3, 2
(3) 2, 2
(4) 4, 3
Answer- 4
Explanation-A thyristor is a solid-state semiconductor device with four layers of alternating P- and N-type materials. It have three terminal-Anode, Cathode, Gate
HSSC JE Electrical 2018 Questions
Question-12.Which among the below stated Boolean expressions do not obey De-Morgan’s theorem
(1) X’+Y’=X’.Y’
(2) X’.Y’=X’+Y’
(3) X.Y=(X+Y)’
(4) X’+Y=X.Y
Answer- 3
Explanation– According to De-Morgan’s theorem-The complement of the product of two or more variables is equal to the sum of the complements of the variables.
Question-14. Which of the following quantities are same in all parts of parallel circuit
(1) Resistance
(2) Voltage
(3) Power
(4) Current
Answer-2
Explanation-Voltage is the same across each component of the parallel circuit.
Question-14. Power factor is the ratio of
(1) Resistance to Inductance
(2) Inductance to Capacitance
(3) Resistance to Impedance
(4) Inductance to Impedance
Answer-3
Explanation-Power Factor=Cos(θ) = Real power (P)/Apparent power (S)= W/VA =R/Z
HSSC JE Electrical 2018 Questions
Question-15.The unit of resistivity is
(1) ohm-meter
(2) mho-meter
(3) ampere-meter
(4) voltage-meter
Answer-1
Explanation-Electrical resistivity is a fundamental property of a material that quantifies how strongly it resists the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current. The SI unit of electrical resistivity is the ohm⋅ metre (Ω⋅m)
Question-16. The Load factor
(1) is always more than 1
(2) is always less than 1
(3) 1
(4) 0
Answer- 2
Explanation-The load factor is defined as the average load divided by the peak load in a specified time period, It is always less than 1
HSSC JE Electrical 2018 Questions
Question-17.. Nuclear power plant is normally used for
(1) Base load
(2) Peak load
(3) Average load
(4) Any load
Answer- 1
Explanation– The base load power plants typically are nuclear plants or coal-fueled, due to low-cost fuel and steady state power they can produce.
Question-18. From below which power station has maximum efficiency
(1) Steam Power Station
(2) Hydro-electrical Power Station
(3) Diesel Power Station
(4) Nuclear Power Station
Answer- 2
Explanation–
Hydro Power station-85% efficient
Nuclear Power station-55% efficient
Diesel Power station-35% efficient
Steam Power station-25% efficient
HSSC JE Electrical 2018 Questions
Question-19.Which of the below metal is not used in Nuclear power plant as fuel
(1) Uranium
(2) Thorium
(3) Plutonium
(4) Magnesium
Answer- 4
Explanation-Metal is used in Nuclear power plant as fuel is enriched uranium (U-235) or reprocessed plutonium (Pu-239) and thorium.
Question-20.Which of the following power plant has practically no stand by loss
(1) Hydro-electric power plant
(2) Diesel power plant
(3) Nuclear power plant
(4) Steam power plant
Answer- 1
Explanation-Hydro Power station-85% efficient-This Plant has no stand-by losses
Question-21.What is the value of Load Factor
(1) <1
(2) >1
(3) >=1
(4) <0
Answer- 1
Explanation-The load factor is defined as the average load divided by the peak load in a specified time period,It is always less than 1
HSSC JE Electrical 2018 Questions
Question-22. In electric welding, arc blow can be avoided by
(1) using ac machines.
(2) increasing arc length.
(3) using bare electrodes.
(4) welding away from ground connection.
Answer- 1
Explanation-Arc blow is the undesirable effect of a electric welding during arc welding. They are two kinds of arc blow-Magnetic and Thermal.In electric welding, arc blow can be avoided by using ac machines.
Question-23.Which switch use in Staircase Wiring Circuits
(1) One way switch
(2) Two way center off switch
(3) Two way switch
(4) Double pole main switch
Answer-3
Explanation-Two way switching means having two or more switches in different locations to control one lamp. It use in Staircase Wiring Circuits
HSSC JE Electrical 2018 Questions
Question-24.Minimum size of the aluminium conductor in domestic wiring is
(1) 1.0 sq.mm.
(2) 2.5 sq.mm.
(3) 0.5 sq.mm.
(4) 1.5 sq.mm.
Answer-3
Explanation-Minimum size of the aluminium conductor in domestic wiring is 0.5 sq.mm.
Question-25.The material most commonly used for overhead line insulators is
(1) Rubber
(2) Wood
(3) Copper
(4) Porcelain
Answer-4
Explanation-Porcelain in most commonly used material for over head insulator.
