Test For Engineer(pdb, Desco,desa)

74 Questions

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Test For Engineer(pdb, Desco,desa)

Questions and Answers
  • 1. 
    Resistivity of a wire depends on
    • A. 

      Length

    • B. 

      Material

    • C. 

      Cross section area

    • D. 

      None

  • 2. 
    When n resistances each of value r are connected in parallel, then resultant resistance is x. When these n resistances are connected in series, total resistance is
    • A. 

      Nx

    • B. 

      Mx

    • C. 

      X/n

    • D. 

      N^2 x.

  • 3. 
    Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is
    • A. 

      R/2

    • B. 

      4r

    • C. 

      2r

    • D. 

      R/4

  • 4. 
    Kirchhoff's second law is based on law of conservation of
    • A. 

      Charge

    • B. 

      Energy

    • C. 

      Momentum

    • D. 

      Mass

  • 5. 
    The diameter of the nucleus of an atom is of the order of
    • A. 

      10^ -31 m

    • B. 

      10^ -25 m

    • C. 

      10^ -21 m

    • D. 

      10^ -14 m

  • 6. 
    The mass of proton is roughly how many times the mass of an electron?
    • A. 

      184000

    • B. 

      18400

    • C. 

      1840

    • D. 

      184

  • 7. 
    The charge on an electron is known to be 1.6 x 10-19 coulomb. In a circuit the current flowing is 1 A. How many electrons will be flowing through the circuit in a second?    
    • A. 

      1.6 x 10^19

    • B. 

      1.6 x 10^-19

    • C. 

      0.625 x 10^19

    • D. 

      0.625 x 10^12

  • 8. 
    Two bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in series to 250 volts supply. Power consumed in circuit is
    • A. 

      33 watt

    • B. 

      67 watt

    • C. 

      100 watt

    • D. 

      300 watt

  • 9. 
    Ampere second could be the unit of``
    • A. 

      Power

    • B. 

      Conductance

    • C. 

      Energy

    • D. 

      Charge

  • 10. 
    Which of the following is not the same as watt?
    • A. 

      Joule/sec

    • B. 

      Amperes/volt

    • C. 

      amperes x volts

    • D. 

      ( amperes )^2 x ohm.

  • 11. 
    An electric current of 5 A is same as
    • A. 

      5 J / C

    • B. 

      5 V/ C

    • C. 

      5 C/ sec

    • D. 

      5 W / sec

  • 12. 
    An electron of mass m kg and having a charge of e coulombs travels from rest through a potential difference of V volts. Its kinetic energy will be
    • A. 

      EV Joules

    • B. 

      MeV Joules

    • C. 

      Me/V Joules

    • D. 

      V/me Joules

  • 13. 
    A circuit contains two un-equal resistances in parallel
    • A. 

      Current is same in both

    • B. 

      large current flows in larger resistor

    • C. 

      Potential difference across each is same

    • D. 

      Smaller resistance has smaller conductance

  • 14. 
    In an alternator, voltage drops occurs in
    • A. 

      Armature resistance only

    • B. 

      Armature resistance and leakage reactance

    • C. 

      Armature resistance, leakage reactance and armature reaction

    • D. 

      armature resistance, leakage reactance, armature reaction and earth connections.

  • 15. 
    The magnitude of various voltage drops that occur in an alternator, depends on
    • A. 

      Power factor of the load

    • B. 

      Power factor x load current

    • C. 

      load current

    • D. 

      Power factor x (load current)^2.

  • 16. 
    The total impedance of a parallel LC circuit approaches “x” as the power supply frequency approaches resonance
    • A. 

      Infinity

    • B. 

      Unity

    • C. 

      Lagging

  • 17. 
    When multiple sine waveforms are mixed together (as is often the case in music), the lowest frequency sine-wave is called the fundamental, and the other sine-waves whose frequencies are whole-number multiples of the fundamental wave are called
    • A. 

      Low band width

    • B. 

      Harmonics

    • C. 

      High band width

  • 18. 
    Capacitors store energy in the form of an electric field, and electrically manifest that stored energy as a potential:
    • A. 

      Static voltage

    • B. 

      Capacitive voltage

    • C. 

      Variable voltage

  • 19. 
    When the power supply frequency for an AC circuit exactly matches that circuit’s natural oscillation frequency as set by the L and C components, a condition of “x” will have been reached.
    • A. 

      Resonance

    • B. 

      Reactance

    • C. 

      Impedance matching

  • 20. 
    A capacitor and inductor directly connected together form something called a “x” circuit,
    • A. 

      Tank

    • B. 

      Capacitive

    • C. 

      Inductive

  • 21. 
    Resistance is essentially “x” against the motion of electrons.
    • A. 

      Inertia

    • B. 

      Friction

    • C. 

      Impact

  • 22. 
    Reactance is essentially “x” against the motion of electrons.
    • A. 

      Friction

    • B. 

      Inertia

    • C. 

      Impact

  • 23. 
    Inductive reactance increases with increasing
    • A. 

      Frequency

    • B. 

      Current

    • C. 

      Power factor

  • 24. 
    A purely resistive impedance will always have a phase angle of exactly
    • A. 

      0 degree

    • B. 

      90 degree

    • C. 

      360 degree

  • 25. 
    The “x” effect is where alternating current tends to avoid travel through the center of a solid conductor, limiting itself to conduction near the surface.
    • A. 

      Ferrari

    • B. 

      Skin

    • C. 

      Capacitive

  • 26. 
    The equation for approximating skin effect at high frequencies (greater than 1 MHz) is : RAC = (RDC)(k) root of F. what k means here?   
    • A. 

      Wire gauge factor

    • B. 

      Wire resistance factor

    • C. 

      Co. efficient temperature of resistance

  • 27. 
    A “x” number is a mathematical quantity representing two dimensions of magnitude and direction.
    • A. 

      Scalar

    • B. 

      Vector

    • C. 

      Complex

  • 28. 
    All the laws and rules of DC circuits apply to AC circuits, with the exception of “x” calculations
    • A. 

      Power

    • B. 

      Voltage

    • C. 

      Current

  • 29. 
    A changing electric field produces a perpendicular “x” field, 
    • A. 

      Magnetic

    • B. 

      Electric

    • C. 

      Current

  • 30. 
    A changing magnetic field produces a perpendicular “x” field.
    • A. 

      Magnetic

    • B. 

      Electric

    • C. 

      Current

  • 31. 
    Analog, electromechanical meter movements respond proportionally to the “x” of an AC voltage or current.
    • A. 

      Rms value

    • B. 

      Average value

    • C. 

      Peak value

  • 32. 
    A “x” waveform is defined as one waveform that is ahead of another in its evolution.
    • A. 

      Lagging

    • B. 

      Leading

    • C. 

      Unity

  • 33. 
    The “x” of an AC waveform is the ratio of its RMS value to its average value.
    • A. 

      Form factor

    • B. 

      Crest factor

    • C. 

      Rms factor

  • 34. 
    Frequency is described as 1/”x”. What x means here?
    • A. 

      Period

    • B. 

      Magnitude

    • C. 

      Amplitude

  • 35. 
    The “x” of a wave is the amount of time it takes to complete one cycle. What x means here?          
    • A. 

      Period

    • B. 

      Magnitude

    • C. 

      Amplitude

  • 36. 
      “x” is a way of expressing an AC quantity of voltage r current in terms functionally equivalent to DC.      
    • A. 

      Rms

    • B. 

      Average

    • C. 

      Peak value

  • 37. 
    The “x” of an AC waveform is its height as depicted on a graph over time
    • A. 

      Period

    • B. 

      Magnitude

    • C. 

      Amplitude

  • 38. 
    • A. 

      Short circuit

    • B. 

      Earthing

    • C. 

      Lighting arrester

  • 39. 
    • A. 

      Neutral supply

    • B. 

      Earthing

    • C. 

      Antenna

  • 40. 
    • A. 

      Outgoing feeder

    • B. 

      Current flow

    • C. 

      Incoming feeder

  • 41. 
    • A. 

      Outgoing feeder

    • B. 

      Current flow

    • C. 

      Incoming feeder

  • 42. 
    • A. 

      Meter box

    • B. 

      Inverter

    • C. 

      Rectifier

  • 43. 
    • A. 

      meter box

    • B. 

      Inverter

    • C. 

      Rectifier

  • 44. 
    • A. 

      Current transformer

    • B. 

      Auto transformer

    • C. 

      Voltage transformer

  • 45. 
    • A. 

      Current transformer

    • B. 

      Auto transformer

    • C. 

      Voltage transformer

  • 46. 
    • A. 

      Inertia switch

    • B. 

      Two way switch

    • C. 

      Spark plug

  • 47. 
    • A. 

      Capacitor

    • B. 

      clutch break

    • C. 

      Isolator

  • 48. 
    • A. 

      Or gate

    • B. 

      Nor gate

    • C. 

      Nand gate

  • 49. 
    PIM stands for?
  • 50. 
    • A. 

      1 phase line

    • B. 

      Line damaged

    • C. 

      Line open

  • 51. 
    Find out what it means?
    • A. 

      3phase delta winding

    • B. 

      3 phase cable

    • C. 

      3 phase star winding

  • 52. 
    What is the unit of resistance?
    • A. 

      Ohm

    • B. 

      Volt

    • C. 

      Amp

    • D. 

      Farad

    • E. 

      Henry

  • 53. 
    How does hydrpelectric energy work?
    • A. 

      It uses the power of the sun to turn work

    • B. 

      Water turns a piece similar to a propeller to power

    • C. 

      The water heats up and it turns into water vaper to power

    • D. 

      Water freezes and then is thrown to power it

  • 54. 
    Pick the answer that is NOT AN ADVANTAGE
    • A. 

      Its renewable

    • B. 

      Low maintennce costs

    • C. 

      Its costs very little to make

    • D. 

      Fuel is not burned

  • 55. 
    True or false? is hydroelectric energy a nonreneable resource?
    • A. 

      True

    • B. 

      False

  • 56. 
    Where is hydroelectric energy used the most
    • A. 

      United states

    • B. 

      Japan

    • C. 

      Geenland

    • D. 

      China

  • 57. 
    What pulls water into the penstock?
    • A. 

      Gravity

    • B. 

      The force of all the water

    • C. 

      Gary falkman

    • D. 

      The turbine

  • 58. 
    Why is it so easy for hydroelectric energy to make energry
    • A. 

      It was made that way

    • B. 

      Water is everywhere so you can use it everywhere

    • C. 

      It dosent cost that much to make one

    • D. 

      It rains all the time

  • 59. 
    What is a main power plant for hydroelectric energy
    • A. 

      Rivers

    • B. 

      Oceans

    • C. 

      Dams

    • D. 

      Sunflowers

  • 60. 
    Blank is in a dam that is powering and making the energy
    • A. 

      Tubines

    • B. 

      Water

    • C. 

      Justin beaber

    • D. 

      Gravity

  • 61. 
    Hydroelectric energy converts gravitational potential energyof water into
    • A. 

      Power

    • B. 

      Kinetic energy

    • C. 

      Kittens

    • D. 

      Mechnical energy

  • 62. 
    Circuit breaker
    • A. 

      The rate at which electrical energy is converted to another form of energy,

    • B. 

      Device that prevents a circuit from overheating and causing a fire.

    • C. 

      Devices that use electrical energy.

    • D. 

      Metal that melts if the current becomes too high.

  • 63. 
    T  or   FTo use electrical energy, a complete circuit must be made.
    • A. 

      True

    • B. 

      False

  • 64. 
    The circuit has only one loop to flow through.
    • A. 

      Series

    • B. 

      Closed

    • C. 

      Parallel

    • D. 

      Open

    • E. 

      Fused

  • 65. 
    T  or FWhen any part of a series circuit is discontinued, most of the currency flows through the circuit.
    • A. 

      True

    • B. 

      False

  • 66. 
    T  or FOpen circuit is the same as series circuit because the parts of a series circuit are wired one after another thus the amount of current is the same through every part.
    • A. 

      True

    • B. 

      False

  • 67. 
    Contains two or more branches for current to flow through.
    • A. 

      Series

    • B. 

      Open

    • C. 

      Parallel

    • D. 

      Fuses

  • 68. 
    T  or FAccording to Ohms Law, more currents flow through the branches that have higher resistance.
    • A. 

      True

    • B. 

      False

  • 69. 
    Contains a small piece of metal that melts if the current becomes too high.
    • A. 

      Series

    • B. 

      Open

    • C. 

      Parallel

    • D. 

      Fuses

  • 70. 
    T  or FMelting of a fuse causes a break in the circuit, stopping the flow of current through the over circuit.
    • A. 

      True

    • B. 

      False

  • 71. 
    A change in composition or structure is called ____.
    • A. 

      Energy

    • B. 

      Transformation

    • C. 

      Generator

    • D. 

      Turbine

    • E. 

      Reformation

  • 72. 
    Energy forms can be ____.
    • A. 

      Chemical

    • B. 

      Thermal

    • C. 

      Electrical

    • D. 

      Radiant

    • E. 

      All of the above

  • 73. 
    Where is the potential energy greatest?
    • A. 

      At the dip two cars past the red arrow.

    • B. 

      As the car is moving up the hill 3 cars past the red arrow.

    • C. 

      At the top of the hill before the red arrow.

    • D. 

      There is no example of potential energy.

  • 74. 
    Where is the kinetic energy GREATEST?
    • A. 

      As the biker is climbing the hill.

    • B. 

      As the biker is at the top of the hill.

    • C. 

      AS the biker is on the downside of the hill.

    • D. 

      There is no example of kinetic energy.