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MCQs

Total Questions : 166 | Page 10 of 17 pages
Question 91. Overhead telephone wires are made of
  1.    aluminium
  2.    steel
  3.    ACSR conductors
  4.    Copper
 Discuss Question
Answer: Option B. -> steel
Question 92. _________ is most commonly used for making magnetic recording tape
  1.    Silver nitrate
  2.    Ferric oxide
  3.    Small particles of iron
  4.    Silicon-iron
 Discuss Question
Answer: Option B. -> Ferric oxide
Question 93. A good electric contact material should have all of the following properties except
  1.    High resistivity
  2.    High resistance to corrosion
  3.    Good thermal conductivity
  4.    High melting point
 Discuss Question
Answer: Option A. -> High resistivity
Question 94. Non-linear resistors
  1.    Produce harmonic distortion
  2.    Follows Ohm’s law at low temperatures only
  3.    Result in non-uniform heating
  4.    None of the above
 Discuss Question
Answer: Option A. -> Produce harmonic distortion
Question 95. The covalent bond is formed by
  1.    Transfer of electrons between atoms
  2.    Sharing of electrons between atoms
  3.    Sharing of variable number of electrons by a variable number of atoms
  4.    None of the above
 Discuss Question
Answer: Option B. -> Sharing of electrons between atoms
Question 96. At transition temperature the value of critical field is
  1.    Zero
  2.    Negative real value
  3.    Positive real value
  4.    Complex value
 Discuss Question
Answer: Option A. -> Zero
Question 97. Carbon electrodes are not used in
  1.    GLS lamps
  2.    Electric arc furnace
  3.    Dry cells
  4.    Cinema projectors
 Discuss Question
Answer: Option A. -> GLS lamps
Question 98. The formula __________ determines the number of electrons that can be accommodated in any level.
  1.    2n2
  2.    4n2
  3.    2n3
  4.    4ns
 Discuss Question
Answer: Option A. -> 2n2
Question 99. Solder is an alloy of
  1.    Copper and aluminium
  2.    Tin and lead
  3.    Nickel, Copper and zinc
  4.    Silver, copper and lead
 Discuss Question
Answer: Option B. -> Tin and lead
Question 100. ________ is the most detrimental impurity in the magnetic materials
  1.     Sulphur.
  2.     Oxygen.
  3.     Nitrogen.
  4.     Carbon.
 Discuss Question
Answer: Option D. ->  Carbon.

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