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

Subjects : Basic Electrical Engineering, Magnetic Circuits and Electromagnetism, AC Fundamentals and AC Machines, Electrical Measurement and Measuring Instruments, DC Machines and Transformers, Alternators and Synchronous Machines, Power Generation, Transmission and Distribution, Estimation and Costing, Electrical Installation and Earthing, Power Systems and Economics, Cables, Switchgear and Protection Systems, Utilization of Electrical Energy, Basic Electronics, Computer and IT and Contemporary Technological Development and Innovation in this field, General Information Related to the state of UP

Question Bank UPSSSC Junior Engineer (Electrical) Exam - English
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Basic Electrical Engineering

Question 1Single Answer
Electric current is the rate of flow of which quantity?
  1. A
    Magnetic flux
  2. B
    Resistance
  3. C
    Electrical energy
  4. D
    Electric charge
Question 2Single Answer
The SI unit of electric current is:
  1. A
    Watt
  2. B
    Coulomb
  3. C
    Ampere
  4. D
    Volt
Question 3Single Answer
The SI unit of electric charge is:
  1. A
    Ohm
  2. B
    Ampere
  3. C
    Joule
  4. D
    Coulomb
Question 4Single Answer
Potential difference is defined as:
  1. A
    Current flowing per unit area
  2. B
    Power consumed per unit resistance
  3. C
    Energy transferred per unit charge
  4. D
    Charge transferred per unit time
Question 5Single Answer
One volt is equivalent to:
  1. A
    One joule per second
  2. B
    One joule per coulomb
  3. C
    One coulomb per second
  4. D
    One ampere per ohm

Magnetic Circuits and Electromagnetism

Question 6Single Answer
A diamagnetic material placed in a nonuniform magnetic field is generally:
  1. A
    Weakly repelled from the stronger field
  2. B
    Strongly attracted toward the stronger field
  3. C
    Permanently magnetized in the field direction
  4. D
    Unaffected under all conditions
Question 7Single Answer
A paramagnetic material is generally:
  1. A
    Strongly repelled by a magnetic field
  2. B
    Completely unaffected by a magnetic field
  3. C
    Weakly attracted toward a stronger magnetic field
  4. D
    Permanently magnetized after removing the field
Question 8Single Answer
Which of the following is ferromagnetic at ordinary room temperature?
  1. A
    Bismuth
  2. B
    Copper
  3. C
    Cobalt
  4. D
    Aluminium
Question 9Single Answer
The magnetic susceptibility of an ordinary diamagnetic material is:
  1. A
    Small and negative
  2. B
    Infinite
  3. C
    Exactly zero
  4. D
    Large and positive
Question 10Single Answer
The relative permeability of an ordinary paramagnetic material is:
  1. A
    Slightly greater than 1
  2. B
    Slightly less than 1
  3. C
    Exactly zero
  4. D
    Always negative

AC Fundamentals and AC Machines

Question 11Single Answer
Alternating current is characterized by:
  1. A
    A permanently fixed direction
  2. B
    Periodic reversal of direction
  3. C
    Constant magnitude under all conditions
  4. D
    Flow only through capacitors
Question 12Single Answer
One complete cycle of a sinusoidal waveform corresponds to:
  1. A
    90°
  2. B
    180°
  3. C
    360°
  4. D
    270°
Question 13Single Answer
The SI unit of frequency is:
  1. A
    Second
  2. B
    Radian
  3. C
    Hertz
  4. D
    Weber
Question 14Single Answer
The relationship between frequency f and time period T is:
  1. A
    f = T
  2. B
    f = 2T
  3. C
    f = 1/T
  4. D
    f = T²
Question 15Single Answer
The time period of a 50 Hz alternating waveform is:
  1. A
    2 ms
  2. B
    50 ms
  3. C
    20 ms
  4. D
    200 ms

Electrical Measurement and Measuring Instruments

Question 16Single Answer
Which instrument directly measures electrical active power?
  1. A
    Frequency meter
  2. B
    Megohmmeter
  3. C
    Wattmeter
  4. D
    Phase-sequence indicator
Question 17Single Answer
An electrical energy meter measures the accumulated value of:
  1. A
    Voltage alone
  2. B
    Current alone
  3. C
    Frequency multiplied by resistance
  4. D
    Power integrated over time
Question 18Single Answer
The SI unit of power is:
  1. A
    Watt-hour
  2. B
    Joule
  3. C
    Watt
  4. D
    Coulomb
Question 19Single Answer
Which of the following is a unit of electrical energy?
  1. A
    Kilowatt
  2. B
    Kilowatt-hour
  3. C
    Kilovolt
  4. D
    Kilovolt-ampere
Question 20Single Answer
One kilowatt-hour is equal to:
  1. A
    3.6 × 10⁵ J
  2. B
    3.6 × 10³ J
  3. C
    3.6 × 10⁶ J
  4. D
    3.6 × 10⁹ J

DC Machines and Transformers

Question 21Single Answer
The yoke of a conventional DC machine primarily provides:
  1. A
    Electrical insulation between armature conductors
  2. B
    Rectification of the armature current
  3. C
    Mechanical support and a magnetic return path
  4. D
    Speed control by varying resistance
Question 22Single Answer
The pole shoes of a DC machine help to:
  1. A
    Reverse the supply polarity
  2. B
    Eliminate the need for field windings
  3. C
    Spread magnetic flux over the armature surface
  4. D
    Increase the armature’s electrical resistance
Question 23Single Answer
In a conventional DC machine, the armature winding is located on the:
  1. A
    Stationary yoke
  2. B
    Main pole shoes
  3. C
    Brush holder
  4. D
    Rotor
Question 24Single Answer
The armature core of a DC machine is laminated mainly to reduce:
  1. A
    Bearing friction
  2. B
    Brush-contact resistance
  3. C
    Eddy-current loss
  4. D
    Windage loss
Question 25Single Answer
Slots in the armature core are provided mainly to accommodate the:
  1. A
    Main field poles
  2. B
    Bearings
  3. C
    Brush holders
  4. D
    Armature conductors

Alternators and Synchronous Machines

Question 26Single Answer
An alternator primarily converts:
  1. A
    Mechanical energy into AC electrical energy
  2. B
    Electrical energy into mechanical energy
  3. C
    Chemical energy directly into magnetic energy
  4. D
    AC electrical energy into DC electrical energy
Question 27Single Answer
The generation of emf in an alternator is based on:
  1. A
    Coulomb’s law
  2. B
    Joule’s law
  3. C
    Faraday’s law of electromagnetic induction
  4. D
    Ohm’s law alone
Question 28Single Answer
In a conventional large alternator, the armature winding is located on the:
  1. A
    Stator
  2. B
    Rotor shaft
  3. C
    Exciter frame only
  4. D
    Bearings
Question 29Single Answer
In a conventional rotating-field alternator, the main field winding is located on the:
  1. A
    Rotor
  2. B
    Stator
  3. C
    Terminal board
  4. D
    Neutral conductor
Question 30Single Answer
The main field winding of a conventional wound-field alternator requires:
  1. A
    Three-phase AC at twice the generated frequency
  2. B
    Single-phase AC at the generated frequency
  3. C
    DC excitation
  4. D
    An electrostatic charge only

Power Generation, Transmission and Distribution

Question 31Single Answer
The usual sequence of electrical power delivery is:
  1. A
    Distribution → Generation → Transmission → Utilization
  2. B
    Transmission → Utilization → Generation → Distribution
  3. C
    Generation → Utilization → Distribution → Transmission
  4. D
    Generation → Transmission → Distribution → Utilization
Question 32Single Answer
In a conventional turbine-driven power station, the generator converts:
  1. A
    Mechanical energy into electrical energy
  2. B
    Electrical energy into mechanical energy
  3. C
    Thermal energy directly into electrical energy without motion
  4. D
    Electrical energy into chemical energy
Question 33Single Answer
The primary purpose of a transmission system is to:
  1. A
    Measure household energy consumption
  2. B
    Supply only individual lighting circuits
  3. C
    Transfer bulk electrical power between generating stations and major substations
  4. D
    Convert electrical energy into fuel
Question 34Single Answer
An electrical distribution system primarily delivers power from distribution substations to:
  1. A
    Turbine blades
  2. B
    Boiler furnaces
  3. C
    Consumers
  4. D
    Cooling towers
Question 35Single Answer
An electrical substation may perform voltage transformation, switching, protection, and:
  1. A
    Steam condensation
  2. B
    Coal pulverization
  3. C
    Control of power flows
  4. D
    Nuclear fuel processing

Estimation and Costing

Question 36Single Answer
The principal purpose of electrical estimation is to determine the:
  1. A
    Exact future electricity tariff
  2. B
    Required quantities and probable cost of an electrical installation
  3. C
    Supply frequency from the building area
  4. D
    Manufacturing date of every accessory
Question 37Single Answer
A site survey before preparing an electrical estimate helps establish:
  1. A
    Actual installation conditions, routes, and access requirements
  2. B
    Only the electricity meter reading
  3. C
    Only the colour of the building
  4. D
    A fixed price for every future purchase
Question 38Single Answer
Which drawing is most useful for identifying the physical positions of lights, switches, and wiring routes?
  1. A
    Motor torque–speed curve
  2. B
    Transformer equivalent circuit
  3. C
    Generator open-circuit characteristic
  4. D
    Electrical layout drawing
Question 39Single Answer
A single-line diagram primarily shows the:
  1. A
    Exact physical length of every conductor
  2. B
    Labour attendance for the project
  3. C
    Architectural elevation of the building
  4. D
    Main electrical connections and distribution arrangement
Question 40Single Answer
A detailed electrical estimate is normally prepared from:
  1. A
    Building colour alone
  2. B
    The contractor’s name alone
  3. C
    Drawings, specifications, measured quantities, and applicable rates
  4. D
    The electricity tariff alone

Electrical Installation and Earthing

Question 41Single Answer
The main purpose of an electrical installation is to:
  1. A
    Increase supply frequency
  2. B
    Distribute and utilize electrical energy safely
  3. C
    Reduce insulation resistance
  4. D
    Increase conductor resistance
Question 42Single Answer
Before installing an electrical machine, the first requirement is to check its:
  1. A
    Paint colour
  2. B
    Nameplate rating
  3. C
    Packing material
  4. D
    Manufacturer logo
Question 43Single Answer
The nameplate of an electric motor normally gives its:
  1. A
    Room area
  2. B
    Building height
  3. C
    Cable-tray length
  4. D
    Rated voltage
Question 44Single Answer
Proper foundation of an electric motor is required mainly to:
  1. A
    Increase current
  2. B
    Provide stable mechanical support
  3. C
    Improve frequency
  4. D
    Reduce voltage
Question 45Single Answer
Improper motor alignment can cause:
  1. A
    Reduced vibration
  2. B
    Improved efficiency
  3. C
    Increased insulation resistance
  4. D
    Excessive vibration and bearing wear

Power Systems and Economics

Question 46Single Answer
Load factor is defined as:
  1. A
    Maximum demand ÷ Average load
  2. B
    Maximum demand ÷ Connected load
  3. C
    Connected load ÷ Average load
  4. D
    Average load ÷ Maximum demand
Question 47Single Answer
Demand factor is defined as:
  1. A
    Average load ÷ Maximum demand
  2. B
    Connected load ÷ Maximum demand
  3. C
    Maximum demand ÷ Connected load
  4. D
    Maximum demand ÷ Average load
Question 48Single Answer
Diversity factor is defined as:
  1. A
    Sum of individual maximum demands ÷ Coincident maximum demand
  2. B
    Coincident maximum demand ÷ Sum of individual maximum demands
  3. C
    Connected load ÷ Average load
  4. D
    Average load ÷ Connected load
Question 49Single Answer
The value of load factor can normally be:
  1. A
    Greater than 1
  2. B
    Negative
  3. C
    Always greater than 2
  4. D
    Equal to or less than 1
Question 50Single Answer
Demand factor is normally:
  1. A
    Greater than 1
  2. B
    Always equal to 2
  3. C
    Equal to or less than 1
  4. D
    Negative
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