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MCQs

Total Questions : 441 | Page 44 of 45 pages
Question 431. 0. To prevent the generation of static charges on rubber or flat leather
  1.    surface is moistened
  2.    conductive dressing is done
  3.    oil compound dressing is done
  4.    talcum powder is sprayed on the surface
 Discuss Question
Answer: Option B. -> conductive dressing is done
Question 432. 9. Which is the most superior dielectric out of the following?
  1.    Air
  2.    Glass
  3.    Bakelite
  4.    Paper
 Discuss Question
Answer: Option C. -> Bakelite
Question 433. 1. A capacitor having a capacitance of 40 IttF is connected across 250 V D.C. source. The charging current will be least
  1.    when capacitor is fully charged
  2.    when capacitor is half charged
  3.    when capacitor is almost 25% charged
  4.    initially
 Discuss Question
Answer: Option A. -> when capacitor is fully charged
Question 434. 5. The electrons, in a dielectric, get detached from the atoms under
  1.    high current
  2.    high voltage
  3.    variable current
  4.    breakdown
 Discuss Question
Answer: Option D. -> breakdown
Question 435. 2. A capacitance is a circuit component that opposes the change in circuit
  1.    current
  2.    voltage
  3.    impedance
  4.    none of the above
 Discuss Question
Answer: Option B. -> voltage
Question 436. 3. If Q and C be the charge and capacity of a condenser, then the energy stored in the capacitor is given by
  1.    Q2/C2 2
  2.    ? c2Q2
  3.    Q2/C2
  4.    Q2/C1
 Discuss Question
Answer: Option C. -> Q2/C2
Question 437. 4. If the dielectric of a capacitor is replaced by a conducting material
  1.    the capacitance value of the capacitor will shoot upto very high value
  2.    the capacitor can store infinite charge
  3.    the plates will get short-circuited
  4.    the capacitor will get heated up due to eddy currents
 Discuss Question
Answer: Option C. -> the plates will get short-circuited
Question 438. 6. If C be the capacitance, V be the potential difference and I be the current,then ? will have the unit of CV
  1.    frequency
  2.    power
  3.    reactive power
  4.    time
 Discuss Question
Answer: Option A. -> frequency
Question 439. 7. A ceramic and a mica capacitor have the same physical dimension. Which has the higher value of capacitance?
  1.    Ceramic capacitor
  2.    Mica capacitor
  3.    Both have identical value of capacitance
  4.    It is not possible to conclude on the basis of information supplied
 Discuss Question
Answer: Option A. -> Ceramic capacitor
Question 440. 8. A parallel plate air-filled capacitor has plate area of 10-4 m2 and plate separation of 10-3 m. It is connected to a 0.5 V, 3.6 GHz source. The magnitude of the displacement current is
  1.    10 mA
  2.    100 mA
  3.    10 A
  4.    1.59 mA
 Discuss Question
Answer: Option A. -> 10 mA

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