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

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

Question Bank NGEL Engineer (Electrical) Exam - English
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Electrical

Question 1Single Answer
The primary purpose of a circuit breaker in a substation is to?
  1. A
    Interrupt normal and fault currents
  2. B
    Measure voltage
  3. C
    Provide visible isolation only
  4. D
    Improve power factor
Question 2Single Answer
An isolator is normally operated when the circuit is?
  1. A
    Carrying full-load current
  2. B
    Carrying short-circuit current
  3. C
    De-energized or carrying negligible current
  4. D
    Operating at low power factor
Question 3Single Answer
A current transformer is primarily used to?
  1. A
    Reduce current to a measurable value
  2. B
    Step up system voltage
  3. C
    Increase fault current
  4. D
    Control frequency
Question 4Single Answer
A CVT in an EHV switchyard is mainly used for?
  1. A
    Voltage measurement and carrier coupling
  2. B
    Current measurement
  3. C
    Reactive power generation
  4. D
    Arc extinction
Question 5Single Answer
The device connected between phase and earth to protect equipment against overvoltage is?
  1. A
    CT
  2. B
    Lightning arrester
  3. C
    Isolator
  4. D
    Earth switch
Question 6Single Answer
An earth switch is used to?
  1. A
    Energize a busbar
  2. B
    Measure earth resistance
  3. C
    Ground an isolated section for safety
  4. D
    Interrupt load current
Question 7Single Answer
SF6 gas in a circuit breaker is mainly used because of its?
  1. A
    High electrical conductivity
  2. B
    High dielectric and arc-quenching strength
  3. C
    Low mechanical strength
  4. D
    Magnetic properties
Question 8Single Answer
The making capacity of a circuit breaker is generally expressed in?
  1. A
    Peak value of current
  2. B
    RMS value only
  3. C
    Average current
  4. D
    Reactive current
Question 9Single Answer
The breaking capacity of a circuit breaker indicates its ability to?
  1. A
    Interrupt fault current safely
  2. B
    Close a healthy circuit
  3. C
    Improve voltage regulation
  4. D
    Increase insulation resistance
Question 10Single Answer
Busbars in EHV substations are primarily designed to carry?
  1. A
    Only charging current
  2. B
    Transformer exciting current only
  3. C
    Only earth-fault current
  4. D
    System load and fault current
Question 11Single Answer
The double-busbar arrangement is mainly adopted to improve?
  1. A
    Frequency regulation
  2. B
    Operational flexibility and reliability
  3. C
    Transformer efficiency
  4. D
    Power factor
Question 12Single Answer
A bus coupler circuit breaker is installed to?
  1. A
    Measure bus voltage
  2. B
    Ground a transformer
  3. C
    Connect two bus sections
  4. D
    Protect only lightning arresters
Question 13Single Answer
In a breaker-and-a-half scheme, three circuit breakers normally control?
  1. A
    Two circuits
  2. B
    One circuit
  3. C
    Three circuits
  4. D
    Four circuits
Question 14Single Answer
The breaker-and-a-half scheme is widely used in EHV substations because it provides high?
  1. A
    Harmonic distortion
  2. B
    Voltage drop
  3. C
    Reliability and flexibility
  4. D
    Earth resistance
Question 15Single Answer
The purpose of a wave trap in a transmission-line bay is to?
  1. A
    Block power-frequency current
  2. B
    Interrupt short circuits
  3. C
    Confine carrier-frequency signals to the required line section
  4. D
    Measure current
Question 16Single Answer
PLCC communication commonly uses the?
  1. A
    Earth mat only
  2. B
    Power transmission conductor
  3. C
    Control battery cable
  4. D
    Neutral conductor only
Question 17Single Answer
The coupling capacitor used in PLCC provides?
  1. A
    Low impedance to carrier frequency and high impedance to power frequency
  2. B
    High impedance to both frequencies
  3. C
    Low impedance to power frequency only
  4. D
    DC isolation only
Question 18Single Answer
A line trap offers high impedance mainly to?
  1. A
    50 Hz current
  2. B
    Carrier-frequency signals
  3. C
    DC current
  4. D
    Fault current only
Question 19Single Answer
The rated secondary current of a protection CT is commonly?
  1. A
    100 A
  2. B
    5 A or 1 A
  3. C
    50 A
  4. D
    25 A
Question 20Single Answer
CT secondary terminals should never be left open while the primary is energized because?
  1. A
    Excessively high secondary voltage may develop
  2. B
    Primary current becomes zero
  3. C
    CT ratio becomes unity
  4. D
    System frequency increases
Question 21Single Answer
The secondary of a voltage transformer should not be?
  1. A
    Grounded at one point
  2. B
    Connected to meters
  3. C
    Short-circuited
  4. D
    Fused
Question 22Single Answer
Protection-class CTs are designed mainly to maintain accuracy under?
  1. A
    Very low currents only
  2. B
    DC conditions
  3. C
    High fault currents
  4. D
    No-load conditions
Question 23Single Answer
CT saturation during a fault can cause a protective relay to?
  1. A
    Receive a distorted secondary current
  2. B
    Receive higher frequency
  3. C
    increase bus voltage
  4. D
    Improve its accuracy
Question 24Single Answer
Knee-point voltage is especially important for?
  1. A
    Metering CTs only
  2. B
    Protection CT performance
  3. C
    Power transformers only
  4. D
    Voltage regulators
Question 25Single Answer
The burden of a CT is normally specified in?
  1. A
    Hz
  2. B
    kWh
  3. C
    VA
  4. D
    VArh
Question 26Single Answer
A capacitive voltage transformer is particularly economical at?
  1. A
    Low-voltage DC circuits
  2. B
    12 V systems
  3. C
    Extra-high voltages
  4. D
    Battery systems
Question 27Single Answer
The first operation before maintenance on an energized bay should ultimately ensure?
  1. A
    Safe isolation and earthing
  2. B
    Higher bus voltage
  3. C
    Lower CT ratio
  4. D
    Increased fault level
Question 28Single Answer
Interlocking between isolator and circuit breaker prevents?
  1. A
    Relay operation
  2. B
    Transformer cooling
  3. C
    Incorrect switching sequence
  4. D
    Cable charging
Question 29Single Answer
An isolator normally has?
  1. A
    Significant fault-current interruption capability
  2. B
    Automatic reclosing capability
  3. C
    Current-limiting capability
  4. D
    No intended fault-current breaking duty
Question 30Single Answer
A pantograph isolator is commonly used where?
  1. A
    Transformer oil is tested
  2. B
    DC batteries are installed
  3. C
    Vertical space utilization is advantageous
  4. D
    Underground cables are terminated
Question 31Single Answer
The purpose of grading rings on EHV equipment is to?
  1. A
    Increase earth resistance
  2. B
    Increase power frequency
  3. C
    Improve electric-field distribution
  4. D
    Reduce transformer turns ratio
Question 32Single Answer
Corona on EHV conductors is associated with?
  1. A
    Mechanical resonance
  2. B
    Core saturation only
  3. C
    Transformer oil oxidation
  4. D
    Ionization of surrounding air
Question 33Single Answer
Bundled conductors in EHV transmission lines are mainly used to?
  1. A
    Reduce corona and reactance
  2. B
    Increase corona loss
  3. C
    Eliminate insulation
  4. D
    Increase earth resistance
Question 34Single Answer
String efficiency is associated with?
  1. A
    Underground cables only
  2. B
    Suspension insulator strings
  3. C
    Circuit-breaker contacts
  4. D
    Current transformers
Question 35Single Answer
Arcing horns on insulator strings are intended to?
  1. A
    Improve transformer efficiency
  2. B
    Measure voltage
  3. C
    Protect insulators from arc damage
  4. D
    Operate relays
Question 36Single Answer
The main advantage of a gas-insulated substation is?
  1. A
    Very high audible noise
  2. B
    High land requirement
  3. C
    No need for insulation
  4. D
    Compact size
Question 37Single Answer
The principal insulating medium in conventional GIS is?
  1. A
    SF6 or an approved insulating gas mixture
  2. B
    Water
  3. C
    Transformer oil only
  4. D
    Compressed hydrogen
Question 38Single Answer
AIS stands for?
  1. A
    Automatic Isolation System
  2. B
    Air Insulated Substation
  3. C
    Arc Interruption Scheme
  4. D
    Auxiliary Induction System
Question 39Single Answer
Compared with AIS, GIS generally requires?
  1. A
    Larger phase spacing
  2. B
    More outdoor clearance
  3. C
    Less space
  4. D
    Longer busbars
Question 40Single Answer
Partial discharge in high-voltage equipment indicates?
  1. A
    Normal load flow
  2. B
    Localized insulation discharge
  3. C
    Correct relay coordination
  4. D
    Improved dielectric strength
Question 41Single Answer
Tan-delta testing is commonly used to assess?
  1. A
    CT ratio only
  2. B
    Insulation condition
  3. C
    Frequency
  4. D
    Mechanical torque
Question 42Single Answer
Insulation resistance is normally measured using a?
  1. A
    Wattmeter
  2. B
    Megohmmeter
  3. C
    Frequency meter
  4. D
    Synchroscope
Question 43Single Answer
Contact resistance measurement of a circuit breaker primarily checks?
  1. A
    Transformer ratio
  2. B
    Condition of current-carrying contacts
  3. C
    Bus frequency
  4. D
    Battery capacity
Question 44Single Answer
Circuit-breaker timing tests determine?
  1. A
    Earth-grid resistance only
  2. B
    CT excitation current
  3. C
    Transformer losses
  4. D
    Opening and closing operating times
Question 45Single Answer
Pole discrepancy protection is associated with?
  1. A
    Surge capacitors
  2. B
    Battery chargers
  3. C
    Independent pole-operated circuit breakers
  4. D
    Energy meters
Question 46Single Answer
The anti-pumping circuit of a breaker prevents?
  1. A
    Repeated closing attempts from a maintained close command
  2. B
    Tripping during faults
  3. C
    Charging the spring
  4. D
    Earthing the busbar
Question 47Single Answer
Trip-circuit supervision monitors the?
  1. A
    Earth-mat resistance
  2. B
    Bus voltage only
  3. C
    Transformer oil temperature
  4. D
    Continuity and readiness of the trip circuit
Question 48Single Answer
Breaker failure protection operates when?
  1. A
    An isolator opens correctly
  2. B
    A commanded circuit breaker fails to clear a fault
  3. C
    A CT secondary is grounded
  4. D
    Bus voltage is normal
Question 49Single Answer
The spring-charging motor in a circuit breaker provides energy for?
  1. A
    Mechanical operating mechanism
  2. B
    Voltage measurement
  3. C
    Carrier communication
  4. D
    Bus differential protection
Question 50Single Answer
A trip-free circuit breaker is capable of?
  1. A
    Tripping even when a closing command is maintained
  2. B
    Remaining closed during all faults
  3. C
    Operating without a trip coil
  4. D
    Eliminating protection relays
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