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MCQs

Total Questions : 166 | Page 6 of 17 pages
Question 51. Low resistivity materials are used in
  1.    Transformer, motor and generator windings
  2.    Transmission and distribution lines
  3.    House wiring
  4.    All above applications
 Discuss Question
Answer: Option D. -> All above applications
Question 52. Which of the following materials does not have covalent bonds ?
  1.    Organic polymers
  2.    Silicon
  3.    Metals
 Discuss Question
Answer: Option C. -> Metals
Question 53. Most of the common metals have _________ structure.
  1.    Linear
  2.    Hexagonal
  3.    Orthorhombic
  4.    Cubic
 Discuss Question
Answer: Option D. -> Cubic
Question 54. For germanium the forbidden energy gap is
  1.    0.15 eV
  2.    0.25 eV
  3.    0.5eV
  4.    0.7eV
 Discuss Question
Answer: Option D. -> 0.7eV
Question 55. Thermonic emission occurs in
  1.    Vacuum tubes
  2.    Copper conductors
  3.    Ferrite cores
  4.    Transistors
 Discuss Question
Answer: Option A. -> Vacuum tubes
Question 56. Copper, even though costly, finds use in the windings of electrical machines because
  1.    Copper points offer low contact resistance
  2.    Copper can be easily soldered and welded
  3.    Copper windings are less bulky and the machines become compact
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 57. _______ has zero temperature co-efficient of resistance.
  1.    Aluminium
  2.    Carbon
  3.    Porcelain
  4.    Manganin
 Discuss Question
Answer: Option D. -> Manganin
Question 58. Constantan contains
  1.    Silver and tin
  2.    Copper and tungsten
  3.    Tungsten and silver
  4.    Copper and nickel
 Discuss Question
Answer: Option D. -> Copper and nickel
Question 59. Which of the following is a semiconductor material ?
  1.    Phosphorous
  2.    Rubber
  3.    Silicon
  4.    Aluminium
 Discuss Question
Answer: Option C. -> Silicon
Question 60. __________ is the main constituent of glass
  1.    Fe203
  2.    Si02
  3.    AI2O3
  4.    B2O3
 Discuss Question
Answer: Option B. -> Si02

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