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MCQs

Total Questions : 441 | Page 43 of 45 pages
Question 421. 7. A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is
  1.    I 00 kV/m
  2.    10 kV/m
  3.    5 kV/m
  4.    2 kV/m
 Discuss Question
Answer: Option A. -> I 00 kV/m
Question 422. 3. ®ion around a stationary electric charge has
  1.    an electric field
  2.    a magnetic field
  3.    both and
  4.    none of the above
 Discuss Question
Answer: Option A. -> an electric field
Question 423. 0. Which of the following capacitors preferred for high frequency circuits?
  1.    Air capacitor
  2.    Electrolytic capacitor
  3.    Mica capacitor
  4.    none of the above
 Discuss Question
Answer: Option C. -> Mica capacitor
Question 424. 1. An electrolytic capacitor is made to provide
  1.    low capacitance
  2.    fixed capacitance
  3.    variable capacitance
  4.    large value of capacitance
 Discuss Question
Answer: Option D. -> large value of capacitance
Question 425. 2. In order to remove static electricity from machinery
  1.    construct insulated cabins
  2.    insulate the machinery
  3.    ground the framework
  4.    humidify the surroundings
 Discuss Question
Answer: Option C. -> ground the framework
Question 426. 4. The minimum gradient in a cable occurs in
  1.    insulation
  2.    conductor
  3.    outer sheath
  4.    uniformly all over
 Discuss Question
Answer: Option A. -> insulation
Question 427. 6. Dielectric strength of a medium is usually expressed in
  1.    J/mm
  2.    C/m2
  3.    kV/mm
  4.    N/mm
 Discuss Question
Answer: Option C. -> kV/mm
Question 428. 7. Which of the following medium will have highest value of relative permittivity?
  1.    Water
  2.    Glass
  3.    Mica
  4.    Paper
 Discuss Question
Answer: Option A. -> Water
Question 429. 8. A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be
  1.    5 times smaller than before
  2.    5 times greater than before
  3.    10 times greater than before
  4.    25 times larger than before
 Discuss Question
Answer: Option D. -> 25 times larger than before
Question 430. 5. A charge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 103 N, is known as
  1.    milli-coulomb
  2.    micro-coulomb
  3.    pico-coulomb
  4.    coulomb
 Discuss Question
Answer: Option B. -> micro-coulomb

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