PIPE Elements (Chapter 18: Basic Electrical Energy)

1. Ebb current refers to:
   A. the eddy current
   B. the movement of the tidal current
   away from shore or down a tidal
   stream
   C. the removal by screen of undesirable
   fine materials from broken ore
   D. none of the above

B. the movement of the tidal current
away from shore or down a tidal
stream

2. In power station practice "spinning reverse is
   A. reverse generating capacity that is in
   operation but not in service
   B. reserve generating capacity that is
   connected to bus and ready to take load
   C. reserve generating capacity that is
   available for service but not in operation
   D. capacity of the part of plant remains
   under maintenance

B. reserve generating capacity that is
connected to bus and ready to take load

3. Turn around efficiency of battery
   energy storage system is about
   A. 75 percent
   B. 40 percent
   C. 25 percent
   D. 80 percent

A. 75 percent

4. Most of the generators in thermal
   power plants run at:
   A. 15000 rpm
   B. 1500 rpm
   C. 750 rpm
   D. 3000 rpm

B. 1500 rpm

5. The power supplied to domestic
   consumer is at 220 volts. This
   represents:
   A. mean value of voltage
   B. seak value of voltage
   C. RMS value of voltage
   D. none of the above

C. RMS value of voltage

6. The conductors that are used for
   transmitting bulk of power at high
   voltage are of which of the following
   type?
   A. Cadmium copper
   B. Galvanized steel
   C. Any of the above
   D. Copper

D. Copper

7. When a conductor is suspended
   between two supports at the same
   level its shape becomes:
   A. catenary
   B. cycloid
   C. semicircle
   D. parabola

A. catenary

8. Sag is provided in overhead
   transmission line so that:
   A. repairs can be carried out easily
   B. corona can be reduced
   C. skin effect can be reduced
   D. safe tension is not exceeded

D. safe tension is not exceeded

9. The string efficiency in an AC system
   is:
   Α. 50.75%
   Β. 100%
   C. 25.50%
   D. 70.7%

D. 70.7%

10. Satellites are powered by

    A. solar cells
    B. thermo-electric generators
    C. thermionic converters
    D. photo-electric cells

A. solar cells

11. A ship is powered by:
    A. steam turbine
    B. diesel engines
    C. steam turbines or diesel engine
    D. steam turbines, diesel engines,
    hydraulic turbines or nuclear
    reactors

B. diesel engines

12. Which of the following plant is
    suitable for peak load?
    A. Diesel engine plant
    B. Steam power plant
    C. Nuclear power plat
    D. All of the above

A. Diesel engine plant

13. The term ‘critical’ is associated with
    power plant of the type:
    A. steam power plant
    B. diesel engine power plant
    C. gas turbine power plant
    D. nuclear power plant

D. nuclear power plant

14. A turbocharger is a part of:

    A. thermal power plant
    B. diesel engine power plant
    C. hydro-electric power plant
    D. nuclear power plant

B. diesel engine power plant

15. Which of the following plant has
    least pollution problem?
    A. Steam power plant
    B. Gas turbine power plant
    C. Nuclear power plant
    D. Hydro-electric power plant

D. Hydro-electric power plant

16. Which of the following power plant
    can be installed within the shortest
    time?
    A. Nuclear power plant
    B. Hydro-electric power plant
    C. Gas turbine power plant
    D. Diesel engine plant

D. Diesel engine plant

17. Which of the following item
    consumes least power?
    A. Toaster
    B. Desert cooler
    C. Electric shaver
    D. Electric iron

C. Electric shaver

18. Which of the following needs
    highest level of illumination?
    A. Proof reading
    B. Hospital wards
    C. Railway platforms
    D. Foyer for cinema halls

A. Proof reading

19. The lamp that is used for cinema
    projectors is a:
    A. frosted GLS lamp
    B. nitrogen filled GLS lamp
    C. mercury vapor lamp
    D. carbon arc lamp

D. carbon arc lamp

20. In a fluorescent tube circuit, choke
    acts as
    A. a starter
    B. a device for improving the power
    factor
    C. a current limiting device
    D. a source of heat

B. a device for improving the power
factor

21. Transient disturbances are due
    to:

    A. switching operations
    B. load variation
    C. faults
    D. any of the above

D. any of the above

22. Bottoming cycle is quite common
    in:
    A. cement plants
    B. sugar mills
    C. paper mills
    D. all of the above

A. cement plants

23. Which of the following is the most
    highly developed device for confining
    plasma with magnetic field?
    A. Tokamak
    B. Tomahawk
    C. Breeder reactor
    D. Cyclotron

A. Tokamak

24. Fuses and circuit breakers do not
    protect electric motors from:
    A. short circuiting
    B. motor burnout
    C. overload
    D. overheating

D. overheating

25. Corona generally results in :

    A. violet glow
    B. hissing noise
    C. production of ozone gas
    D. all of the above

D. all of the above

26. Which of the following affects corona?

    A. Conductor size
    B. Spacing between conductors
    C. Line voltage
    D. All of the above

D. All of the above

27. The statement that the product of the error
    in the measured determination of a particles’
    position and it’s momentum is of the order
    Planck’s constant “h” is known as:
    A. Bohr’s theory
    B. D’Alembert’s paradox
    C. the Heisenberg uncertainty principle
    D. Planck’s law

C. the Heisenberg uncertainty principle

28. The phenomenon of physical adhesion
    of molecules of the surface of solids
    without chemical reaction is
    A. dredging
    B. adsorption
    C. coking
    D. liquation

B. adsorption

29. Fuses and circuit breakers do not
    protect electric motors from:

    A. short circuiting
    B. motor burnout
    C. overload
    D. Overheating

D. Overheating

30. In which of the following systems
    where Betz law is widely used?
    A. MHD system
    B. solar cells
    C. geothermal power plants
    D. wind mills

D. wind mills

31. At what rpm where most of the
    generators in thermal power plants run?
    A. 15000 rpm
    B. 1500 rpm
    C. 750 rpm
    D. 3000 rpm

B. 1500 rpm

32. Turn around efficiency of battery
    energy storage system is about
    A. 75 percent
    B. 40 percent
    C. 25 percent
    D. 80 percent

A. 75 percent

33. The conductors that are used for
    transmitting bulk of power at high voltage
    are of which of the following type?
    A. Cadmium copper
    B. Galvanized steel
    C. Any of the above
    D. Copper

D. Copper

34. The conductors that are used for
    transmitting bulk of power at high voltage
    are of which of the following type?
    A. Cadmium copper
    B. Galvanized steel
    C. Any of the above
    D. Copper

D. Copper

35. Which of the following affects corona?

    A. Conductor size
    B. Spacing between conductors
    C. Line voltage
    D. All of the above

D. All of the above

36. When a conductor is suspended
    between two supports at the same
    level its shape becomes:
    A. catenary
    B. cycloid
    C. semicircle
    D. parabola

A. catenary

37. What is the unit of electromagnetic
    wave frequency?
    A. Volts
    B. Horsepower
    C. Hertz
    D. Knot

C. Hertz

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