[amp_mcq option1=”2 joules” option2=”4 joules” option3=”6 joules” option4=”8 joules” correct=”option2″]
Detailed SolutionWhen 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of
Electrostatics
42. Mica capacitors are characterised by all of the following except
[amp_mcq option1=”stable operation” option2=”accurate value” option3=”low leakage reactance” option4=”low losses” correct=”option4″]
Detailed SolutionMica capacitors are characterised by all of the following except
43. In a cable capacitor, voltage gradient is maximum at the surface of the
[amp_mcq option1=”earth” option2=”conduction” option3=”sheath” option4=”insulator” correct=”option4″]
Detailed SolutionIn a cable capacitor, voltage gradient is maximum at the surface of the
44. The unit of capacitance is
[amp_mcq option1=”henry” option2=”ohm” option3=”farad” option4=”farad/m” correct=”option3″]
45. The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to . . . . . . . . percent of its . . . . . . . . value.
[amp_mcq option1=”37, initial” option2=”62, initial” option3=”62, final” option4=”37, final” correct=”option4″]
46. An electrolytic capacitor is generally made to provide
[amp_mcq option1=”low capacitance” option2=”fixed capacitance” option3=”variable capacitance” option4=”large value of capacitance” correct=”option4″]
Detailed SolutionAn electrolytic capacitor is generally made to provide
47. Which of the following capacitors preferred for high frequency circuits ?
[amp_mcq option1=”Air capacitor” option2=”Electrolytic capacitor” option3=”Mica capacitor” option4=”none of the above” correct=”option3″]
Detailed SolutionWhich of the following capacitors preferred for high frequency circuits ?
48. If three 15 uF capacitors are connected in series, the net capacitance is
[amp_mcq option1=”5 uF” option2=”30 uF” option3=”45 uF” option4=”50 uF” correct=”option2″]
Detailed SolutionIf three 15 uF capacitors are connected in series, the net capacitance is
49. Out of the following capacitors of identical rating which one will have the smallest dimensions ?
[amp_mcq option1=”Aluminium foil capacitor” option2=”Mica capacitor” option3=”Ceramic capacitor” option4=”Paper capacitor” correct=”option3″]
50. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will
[amp_mcq option1=”decrease” option2=”increase” option3=”remains unchanged” option4=”become zero” correct=”option2″]