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MCQs

Total Questions : 441 | Page 1 of 45 pages
Question 1. Which medium has the least dielectric strength ?
  1.    Paraffin wax
  2.    Quartz
  3.    Glass
  4.    Air
 Discuss Question
Answer: Option D. -> Air
Question 2. The minimum value of potential gradient in a cable occurs in
  1.    insulation
  2.    conductor
  3.    outer sheath
  4.    uniformly all over
 Discuss Question
Answer: Option A. -> insulation
Question 3. Dielectric strength ______ with increasing thickness
  1.    increases
  2.    decreases
  3.    remains unaltered
  4.    none of the above
 Discuss Question
Answer: Option B. -> decreases
Question 4. If a third equal and similar charge is placed between two equal and similar charges, then this third charge will
  1.    move out of the field of influence of the two charges
  2.    remain in stable equilibrium
  3.    not be in equilibrium
  4.    be in unstable equilibrium
 Discuss Question
Answer: Option B. -> remain in stable equilibrium
Question 5. Capacitors are mainly used for radio frequency tuning.
  1.    Paper
  2.    Air
  3.    Mica
  4.    Electrolytic
 Discuss Question
Answer: Option B. -> Air
Question 6. The unit of capacitance is
  1.    henry
  2.    ohm
  3.    farad
  4.    farad/m
 Discuss Question
Answer: Option C. -> farad
Question 7. The time constant and R-C circuit may also be defined as the time during which the charging current falls to ______ percent of its initial maximum value,
  1.    37
  2.    42
  3.    63
  4.    73
 Discuss Question
Answer: Option A. -> 37
Question 8. A capacitor consists of two
  1.    Ceramic plates and one mica disc
  2.    Insulators separated by a dielectric
  3.    Silver-coated insulators
  4.    Conductors separated by an insulator
 Discuss Question
Answer: Option D. -> Conductors separated by an insulator
Question 9. An electrolytic capacitor can be used for
  1.    D.C. only
  2.    AC. only
  3.    both D.C. as well as A.C.
  4.    none of the above
 Discuss Question
Answer: Option A. -> D.C. only
Question 10. A paper capacitor is usually available in the form of
  1.    tubes
  2.    rolled foil
  3.    disc
  4.    meshed plates
 Discuss Question
Answer: Option B. -> rolled foil

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