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Objective Questions

Latest NMDC Executive Trainee Exam Question (Objective Questions), MCQ in English

Subjects : Electrical, General Aptitude

Question Bank NMDC Executive Trainee Exam (Electrical) - English
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Electrical

Question 1Single Answer
What is the primary purpose of the Laplace transform in network analysis?
  1. A
    To solve differential equations in the time domain
  2. B
    To convert time-domain signals to frequency domain
  3. C
    To analyze discrete systems
  4. D
    To synthesize network components
Question 2Single Answer
What is the Laplace transform of a unit step function u(t)?
  1. A
    1/s
  2. B
    s
  3. C
    e(-s)
  4. D
    1/(s+1)
Question 3Single Answer
Which property of the Laplace transform is used to handle initial conditions in network analysis?
  1. A
    Linearity
  2. B
    Time-shifting
  3. C
    Differentiation in time domain
  4. D
    Convolution
Question 4Single Answer
What is the Laplace transform of the derivative of a function f(t)?
  1. A
    sF(s)
  2. B
    sF(s) - f(0)
  3. C
    F(s)/s
  4. D
    F(s) + f(0)
Question 5Single Answer
What is the primary application of the Laplace transform in circuit analysis?
  1. A
    Solving algebraic equations
  2. B
    Solving differential equations for transient response
  3. C
    Analyzing steady-state response
  4. D
    Synthesizing network components
Question 6Single Answer
What is the Laplace transform of an exponential function e(-at)?
  1. A
    1/(s+1)
  2. B
    Decrease the speed
  3. C
    Have no effect on speed
  4. D
    Increase the torque
Question 7Single Answer
Which transform is used to analyze the frequency response of a network?
  1. A
    Laplace transform
  2. B
    Fourier transform
  3. C
    Z-transform
  4. D
    Hilbert transform
Question 8Single Answer
What is the primary advantage of using the Fourier transform in network analysis?
  1. A
    Handles initial conditions
  2. B
    Analyzes steady-state sinusoidal signals
  3. C
    Solves discrete systems
  4. D
    Synthesizes networks
Question 9Single Answer
Which property of the Fourier transform is used to analyze convolution in networks?
  1. A
    Linearity
  2. B
    Time-shifting
  3. C
    Convolution theorem
  4. D
    Frequency-shifting
Question 10Single Answer
What is the Laplace transform of a unit impulse function (t)?
  1. A
    1
  2. B
    s
  3. C
    1/s
  4. D
    e(-s)
Question 11Single Answer
What is the impedance of a resistor R in the Laplace domain?
  1. A
    R
  2. B
    sR
  3. C
    R/s
  4. D
    1/R
Question 12Single Answer
What is the impedance of an inductor L in the Laplace domain?
  1. A
    L
  2. B
    sL
  3. C
    L/s
  4. D
    1/sL
Question 13Single Answer
What is the impedance of a capacitor C in the Laplace domain?
  1. A
    C
  2. B
    sC
  3. C
    1/sC
  4. D
    s/C
Question 14Single Answer
Which transform is used to find the transient response of a circuit?
  1. A
    Fourier transform
  2. B
    Laplace transform
  3. C
    Z-transform
  4. D
    Hilbert transform
Question 15Single Answer
What is the Fourier transform used for in network analysis?
  1. A
    Solving initial value problems
  2. B
    Synthesizing discrete systems
  3. C
    Analyzing frequency-domain behavior
  4. D
    Handling non-periodic signals only
Question 16Single Answer
What is the Laplace transform of a ramp function t*u(t)?
  1. A
    1/s
  2. B
    1/s2
  3. C
    s-1
  4. D
    s2
Question 17Single Answer
Which method is used to solve Laplace-transformed circuit equations?
  1. A
    Partial fraction expansion
  2. B
    Matrix inversion
  3. C
    Numerical integration
  4. D
    Fourier series
Question 18Single Answer
What is the primary limitation of the Fourier transform in network analysis?
  1. A
    Cannot handle transient signals
  2. B
    Requires convergence of integrals
  3. C
    Limited to discrete systems
  4. D
    High computational cost
Question 19Single Answer
Which transform is used to analyze the steady-state response of a circuit to a periodic signal?
  1. A
    Laplace transform
  2. B
    Fourier transform
  3. C
    Z-transform
  4. D
    Wavelet transform
Question 20Single Answer
What is the Laplace transform of sin(ωt)?  
  1. A
    ω/(s2 + ω2)  
  2. B
    s/(s2 + ω2)  
  3. C
    1/(s2 + ω2)  
  4. D
    ω/(s + ω)  
Question 21Single Answer
What is the primary application of the Laplace transform in control systems?
  1. A
    Frequency response analysis
  2. B
    Stability analysis using transfer functions
  3. C
    Discrete system analysis
  4. D
    Network synthesis
Question 22Single Answer
Which transform is used to find the transfer function of a network?
  1. A
    Fourier transform
  2. B
    Laplace transform
  3. C
    Z-transform
  4. D
    Hilbert transform
Question 23Single Answer
What is the Fourier transform of a rectangular pulse?
  1. A
    Sinc function
  2. B
    Delta function
  3. C
    Exponential function
  4. D
    Gaussian function
Question 24Single Answer
What is the main advantage of using Laplace transforms in network analysis?
  1. A
    Handles both transient and steady-state responses
  2. B
    Simplifies frequency-domain analysis
  3. C
    Reduces computational complexity
  4. D
    Eliminates initial conditions
Question 25Single Answer
What is the primary purpose of the Z-transform in discrete systems?
  1. A
    To analyze continuous signals
  2. B
    To convert discrete-time signals to frequency domain
  3. C
    To synthesize analog circuits
  4. D
    To solve algebraic equations
Question 26Single Answer
What is the Z-transform of a unit impulse sequence (n)?
  1. A
    1
  2. B
    z
  3. C
    1/z
  4. D
    z(-1)
Question 27Single Answer
What is the Z-transform of a unit step sequence u(n)?
  1. A
    z/(z - 1)
  2. B
    1/(1 - z)
  3. C
    1/(1 - z(-1))
  4. D
    z(-1)/(1 - z(-1))
Question 28Single Answer
Which property of the Z-transform is used to analyze time-shifted sequences?
  1. A
    Linearity
  2. B
    Time-shifting
  3. C
    Convolution
  4. D
    Scaling
Question 29Single Answer
What is the Z-transform of a sequence x(n) shifted by k units, x(n-k)?
  1. A
    z(-k) X(z)
  2. B
    zk X(z)
  3. C
    X(z)/zk
  4. D
    X(z) + zk
Question 30Single Answer
What is the primary application of the Z-transform in discrete systems?
  1. A
    Solving differential equations
  2. B
    Analyzing difference equations
  3. C
    Synthesizing analog filters
  4. D
    Frequency response of continuous systems
Question 31Single 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 32Single 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 33Single 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 34Single 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 35Single 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 36Single 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 37Single 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 38Single 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 39Single 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 40Single 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 41Single 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 42Single 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 43Single 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 44Single 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 45Single 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 46Single Answer
Connected load is 313 kW and maximum demand is 191.9 kW. Demand factor is:
  1. A
    61.3
  2. B
    163.1321
  3. C
    1.6313
  4. D
    0.613
Question 47Single Answer
Sum of individual maximum demands is 281.2 kW and group maximum demand is 214 kW. Diversity factor is:
  1. A
    0.314
  2. B
    1.314
  3. C
    131.4
  4. D
    0.761
Question 48Single Answer
A 165 kW load improves pf from 0.8 to 0.95. Capacitor rating required is about:
  1. A
    123.75 kvar
  2. B
    54.23 kvar
  3. C
    69.52 kvar
  4. D
    34.76 kvar
Question 49Single Answer
A 166 kW, 400 V, 3-phase load operates at 0.8 pf. Line current is:
  1. A
    518.75 A
  2. B
    239.6 A
  3. C
    299.5 A
  4. D
    149.75 A
Question 50Single Answer
A 3-phase line carries 28 A and has 0.218 Ω resistance per phase. Copper loss is:
  1. A
    0.018 kW
  2. B
    0.256 kW
  3. C
    0.513 kW
  4. D
    0.171 kW
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