☰ Electrical Engineering Material (Electrical Engineering) - MCQs

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Q73.

neutral temperature of thermocouple

  • A. is constant for a given thermocouple
  • B. depends upon the nature of the metals of a couple
  • C. who is dependent of temperature of cold junction of the couple
  • D. all of the above
    ✍ Discuss    
Q74.

EMF of thermocouple depends upon the

  • A. nature of material of metals
  • B. difference of temperature of two junctions
  • C. both a and b
  • D. none of the above
    ✍ Discuss    
Q75.

the conductivity of a metal is determined by

  • A. the number of valence electrons per atom
  • B. the electron concentration and the mobility of the free electrons
  • C. both a and b
  • D. none of these
    ✍ Discuss    
Q76.

the resistivity of a metal is a function of temperature because

  • A. the electron density varies with temperature
  • B. the electron gas density varies with temperature
  • C. the lattices vibration increases with temperature
  • D. collision of electrons increases as temperature increases
    ✍ Discuss    
Q77.

the materials not having negative temperature coefficient of resistivity are

  • A. metals
  • B. semiconductors
  • C. insulators
  • D. none of these
    ✍ Discuss    
Q78.

pure metals generally have

  • A. high conductivity and low temperature coefficient
  • B. high conductivity and lost temperature coefficient
  • C. low conductivity and zero temperature coefficient
  • D. low conductive attend high temperature coefficient
    ✍ Discuss    
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