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Hazard
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291786
Filename:
craft
Updated:
2014-12-16 17:27:53
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  1. The resistance to magnetic flux is called
    reluctance
  2. What is the MKS unit for magnetic flux
    Weber
  3. Hardened steel is difficult to magnetize because
    of its low permiability
  4. to measure electrical potential you should use a
    Voltmeter
  5. How should a voltmeter be connected in a circuit to measure voltage?
    In parallel with the potential points being measured
  6. What is used to measure electrical resistance
    ohmmeter and meg-ohmmeter
  7. What property of a material is present in every electrical circuit?
    resistance
  8. Resistors are connected to electrical circuits to
    Limit current
  9. Resistors connected in series across a voltage source to obtain a lower voltage are called voltage
    dividers
  10. opposition to any voltage change in a circuit is caused by
    capacitance
  11. What is the basic unit for measuring the capacitance of a capacitor
    Farad
  12. When capacitors are connected in parallel the effective capacitance of the circuit is
    increased
  13. the opposition to any crrent change in an ac circuit caused by inductance is called
    inductive resistance
  14. Unit used to measure inductive resistance
    Ohm
  15. The ineraction between the roto and stator in an ac motor that causes the rotor to rotate is caused by the
    magneticfeilds
  16. In a Y connected load or source, the line voltage is found by what formual?
    El= sqroute 3Ip
  17. the formula for finding line current in a Y connected load or source is
    IL=Ip
  18. In a delta connected load what formula
    EL=EP
  19. The Cos 0 used in 3 phase power formulas is the
    power factor
  20. One way of measuring power in a 3 phase circuit is by the use of
    3-wattmeters
  21. When measuring the power of a 3 phase circuit at 50 percent power factor using only two watt-meters one watt-meter will read
    Zero
  22. Dielectric strength is usually expressed in
    volts
  23. few electrons and poor conductor is
    insulator
  24. what are insulating materials sometimes called
    Dielectrics
  25. by how much dose the heat caused by current flowing through a wire increase?
    the square of the increase in current
  26. Ohms law simple terms
    The higher the voltage the more current flow through a given resistance
  27. Desirable characteristics of conductor insulation include
    flexibility and mechanical strength
  28. A channel that holds and protects cables or wires is a
    Raceway
  29. BX cable has the same general characteristics as
    flexible conduit
  30. to which transformer winding is voltage supplied?'
    Primary
  31. To which transformer winding is the load connected?
    Secondary
  32. The volt amperes of the primary winding and the volt amperes of the secondary winding are
    equal
  33. The output or capacity of a transformer is measured in
    kVa
  34. Transformer losses are classified as copper losses and
    core losses
  35. Transformer core eddy current losses are reduced  by using a
    laminated core
  36. What voltage will appear across the secondary terminals of an auto transformer if the common winding should open
    primary
  37. A variable transformer is a continuously adjustable
    autotransformer
  38. while working on a current transformer the secondary winding must be
    short circuited
  39. electric current is measured in amperes which are
    Coulomb per second
  40. According to ohms law voltage is equal to
    resistance times current
  41. What happens to total current flow if the voltage of a series circuit is doubled and the resistance stays constant
    doubles
  42. What is common to all components of a series circuit
    current
  43. if one leg of parallel circuit develops an open the total current will
    decrease
  44. What is common to all components of a parallel circuit
    voltage
  45. General purpose transformers are usually
    dry type
  46. A synthetic liquid used in Transformers is known as
    askarel
  47. With a delta delta transformer if one transformer is damaged and removed from service the two remaining transformers can be connected as
    open Delta
  48. In what type of 3 phase motor starters are auto transformers used
    compensating
  49. The installation of dry type transformers in doors are covered by what rules
    NEC

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