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Objective Questions

Latest NHSRCL Junior Engineer Electrical Exam Question (Objective Questions), MCQ in English

Subjects : Domain Knowledge, Quantitative Aptitude, Logical Reasoning, General Knowledge & English

Question Bank NHSRCL Junior Engineer (Electrical) Exam - English
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Domain Knowledge

Question 1Single Answer
The primary purpose of an electrical wiring system in a building is?
  1. A
    To distribute electrical power safely to various loads
  2. B
    To generate electricity
  3. C
    To increase supply frequency
  4. D
    To reduce transformer voltage only
Question 2Single Answer
Which wiring system is commonly used for concealed wiring in modern buildings?
  1. A
    Cleat wiring
  2. B
    Batten wiring
  3. C
    Open lead-sheathed wiring
  4. D
    PVC conduit wiring
Question 3Single Answer
Which type of conduit is generally used for heavy-duty industrial electrical installations?
  1. A
    Flexible plastic conduit
  2. B
    Wooden conduit
  3. C
    Rigid steel conduit
  4. D
    Rubber conduit
Question 4Single Answer
The main function of an electrical conduit is to?
  1. A
    Protect and route electrical conductors
  2. B
    Increase voltage
  3. C
    Generate electrical energy
  4. D
    Improve power factor
Question 5Single Answer
Which conduit is generally preferred where flexibility is required?
  1. A
    Rigid PVC conduit
  2. B
    Flexible conduit
  3. C
    Rigid steel conduit
  4. D
    Concrete conduit
Question 6Single Answer
The purpose of a cable tray is to?
  1. A
    Increase cable current capacity
  2. B
    Support and route electrical cables
  3. C
    Convert AC into DC
  4. D
    Reduce supply frequency
Question 7Single Answer
Which cable tray is generally suitable for carrying large numbers of power cables?
  1. A
    Perforated or ladder-type cable tray
  2. B
    Wooden tray
  3. C
    Plastic pipe
  4. D
    Porcelain channel
Question 8Single Answer
The main advantage of a ladder-type cable tray is?
  1. A
    It completely encloses cables
  2. B
    It provides good ventilation and support for heavy cables
  3. C
    It eliminates the need for cable supports
  4. D
    It is used only for underground cables
Question 9Single Answer
Cable trays should normally be connected to the earthing system to?
  1. A
    Increase insulation resistance
  2. B
    Prevent electric shock due to leakage or fault
  3. C
    Increase cable voltage
  4. D
    Reduce cable length
Question 10Single Answer
Which wiring accessory is used to control a lamp from one location?
  1. A
    Two-way switch
  2. B
    Intermediate switch
  3. C
    One-way switch
  4. D
    Push-button switch
Question 11Single Answer
Which switch arrangement is used to control a lamp from two different locations?
  1. A
    One-way switching
  2. B
    Star switching
  3. C
    Series switching
  4. D
    Two-way switching
Question 12Single Answer
Which device is commonly used to provide protection against overload and short circuit in a building circuit?
  1. A
    Isolator
  2. B
    MCB
  3. C
    Contactor
  4. D
    Voltmeter
Question 13Single Answer
The full form of MCB is?
  1. A
    Main Control Board
  2. B
    Motor Control Breaker
  3. C
    Maximum Current Box
  4. D
    Miniature Circuit Breaker
Question 14Single Answer
Which device provides protection against earth leakage in an electrical installation?
  1. A
    MCB
  2. B
    Fuse link
  3. C
    Isolator
  4. D
    RCCB
Question 15Single Answer
The full form of RCCB is?
  1. A
    Rated Current Control Board
  2. B
    Residual Current Circuit Breaker
  3. C
    Remote Current Circuit Breaker
  4. D
    Resistance Current Control Box
Question 16Single Answer
An RCCB primarily protects against?
  1. A
    Overvoltage
  2. B
    Earth leakage current
  3. C
    Underfrequency
  4. D
    Phase sequence reversal
Question 17Single Answer
Which device combines overcurrent protection and residual current protection?
  1. A
    RCCB
  2. B
    RCBO
  3. C
    Isolator
  4. D
    Contactor
Question 18Single Answer
The full form of RCBO is?
  1. A
    Residual Current Breaker with Overcurrent Protection
  2. B
    Remote Circuit Breaker Operation
  3. C
    Rated Current Board Outlet
  4. D
    Relay Controlled Breaker Operation
Question 19Single Answer
The main purpose of an electrical isolator is to?
  1. A
    Provide visible isolation for maintenance
  2. B
    Interrupt fault current automatically
  3. C
    Regulate voltage
  4. D
    Measure current
Question 20Single Answer
An isolator should normally be operated?
  1. A
    After the circuit breaker has opened the circuit
  2. B
    Under full load only
  3. C
    During a short circuit
  4. D
    Only during overvoltage
Question 21Single Answer
The main function of earthing is to?
  1. A
    Increase supply voltage
  2. B
    Provide a low-resistance path for fault current
  3. C
    Increase load current
  4. D
    Improve frequency regulation
Question 22Single Answer
Which conductor connects exposed metallic parts of equipment to the earth?
  1. A
    Earth conductor
  2. B
    Neutral conductor
  3. C
    Phase conductor
  4. D
    Pilot conductor
Question 23Single Answer
The earth electrode is used to?
  1. A
    Increase earth resistance
  2. B
    Establish electrical connection with the general mass of earth
  3. C
    Supply power to the load
  4. D
    Control the load voltage
Question 24Single Answer
Which material is commonly used for an earth electrode?
  1. A
    Dry wood
  2. B
    Copper or galvanized iron
  3. C
    Plastic
  4. D
    Porcelain
Question 25Single Answer
The resistance of an effective earthing system should generally be?
  1. A
    As high as possible
  2. B
    As low as practicable
  3. C
    Equal to load resistance
  4. D
    Infinite
Question 26Single Answer
The main purpose of equipotential bonding is to?
  1. A
    Increase the phase voltage
  2. B
    Increase load power
  3. C
    Minimize dangerous potential differences between conductive parts
  4. D
    Reduce supply frequency
Question 27Single Answer
Which instrument is used to measure earth resistance?
  1. A
    Megger
  2. B
    Frequency meter
  3. C
    Wattmeter
  4. D
    Earth tester
Question 28Single Answer
Which instrument is used to measure insulation resistance?
  1. A
    Clamp meter
  2. B
    Megger
  3. C
    Power factor meter
  4. D
    Synchroscope
Question 29Single Answer
Load assessment in a building is carried out mainly to?
  1. A
    Estimate the electrical demand and required capacity
  2. B
    Determine the colour of cables
  3. C
    Measure earth resistance only
  4. D
    Select the building material
Question 30Single Answer
The connected load of a building is?
  1. A
    The sum of the rated loads connected to the installation
  2. B
    The maximum demand only
  3. C
    The average load during the day
  4. D
    The minimum load
Question 31Single Answer
Maximum demand is generally?
  1. A
    Less than or equal to connected load
  2. B
    Equal to connected load in every case
  3. C
    Greater than connected load
  4. D
    Always zero
Question 32Single Answer
Diversity factor is defined as?
  1. A
    Maximum demand divided by connected load
  2. B
    Average load divided by peak load
  3. C
    Connected load divided by maximum demand
  4. D
    Sum of individual maximum demands divided by maximum demand of the system
Question 33Single Answer
Demand factor is the ratio of?
  1. A
    Maximum load to average load
  2. B
    Connected load to maximum demand
  3. C
    Average load to maximum load
  4. D
    Maximum demand to connected load
Question 34Single Answer
The diversity factor of an electrical system is generally?
  1. A
    Less than 1
  2. B
    Greater than or equal to 1
  3. C
    Equal to 0
  4. D
    Always negative
Question 35Single Answer
Which factor is important while selecting the current rating of a cable?
  1. A
    Cable colour only
  2. B
    Building height only
  3. C
    Load current and installation conditions
  4. D
    Supply frequency only
Question 36Single Answer
Cable sizing is primarily based on?
  1. A
    Current-carrying capacity, voltage drop and short-circuit withstand capability
  2. B
    Cable length only
  3. C
    Insulation colour only
  4. D
    Number of switches only
Question 37Single Answer
Excessive voltage drop in a cable may cause?
  1. A
    Improved equipment performance
  2. B
    Elimination of power loss
  3. C
    Increased insulation resistance
  4. D
    Poor voltage regulation at the load
Question 38Single Answer
Which parameter increases when the length of a cable increases?
  1. A
    Conductor resistance
  2. B
    Conductor cross-sectional area
  3. C
    Insulation strength
  4. D
    Rated voltage
Question 39Single Answer
Increasing the cross-sectional area of a conductor generally?
  1. A
    Reduces its resistance
  2. B
    Increases its resistance
  3. C
    Makes its resistance infinite
  4. D
    Does not affect its resistance
Question 40Single Answer
Which type of cable is commonly used for underground LT power distribution?
  1. A
    Bare conductor
  2. B
    Flexible cord only
  3. C
    Open copper strip
  4. D
    XLPE insulated armoured cable
Question 41Single Answer
The full form of XLPE is?
  1. A
    Extra Low Power Equipment
  2. B
    External Line Protection Equipment
  3. C
    Cross-Linked Polyethylene
  4. D
    Extra Light Polyethylene
Question 42Single Answer
The main purpose of cable armouring is to?
  1. A
    Increase supply frequency
  2. B
    Provide mechanical protection
  3. C
    Increase insulation resistance only
  4. D
    Reduce conductor size
Question 43Single Answer
Cable glands are used mainly to?
  1. A
    Increase cable voltage
  2. B
    Secure and terminate cables at equipment enclosures
  3. C
    Measure cable current
  4. D
    Reduce supply frequency
Question 44Single Answer
A cable lug is used to?
  1. A
    Measure insulation resistance
  2. B
    Increase cable length
  3. C
    Provide a secure electrical connection between a cable conductor and a terminal
  4. D
    Protect against lightning
Question 45Single Answer
Which precaution is important while laying underground cables?
  1. A
    Laying cables without protection
  2. B
    Removing cable identification marks
  3. C
    Providing suitable depth and mechanical protection
  4. D
    Keeping cables exposed to traffic
Question 46Single Answer
Cable identification tags are used to?
  1. A
    Increase cable current capacity
  2. B
    Reduce cable voltage
  3. C
    Identify cables during installation and maintenance
  4. D
    Improve power factor
Question 47Single Answer
The main function of an LT panel is to?
  1. A
    Generate electrical power
  2. B
    Control, protect and distribute low-voltage electrical power
  3. C
    Increase transmission voltage
  4. D
    Convert AC into mechanical energy
Question 48Single Answer
LT generally refers to voltage levels?
  1. A
    Above 220 kV
  2. B
    Above 400 kV
  3. C
    Between 66 kV and 220 kV only
  4. D
    Up to 1 kV AC
Question 49Single Answer
A busbar in an LT panel is used to?
  1. A
    Collect and distribute electrical power
  2. B
    Measure voltage
  3. C
    Provide lighting
  4. D
    Reduce frequency
Question 50Single Answer
Which material is commonly used for busbars?
  1. A
    Wood
  2. B
    Copper or aluminium
  3. C
    Rubber
  4. D
    Glass
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