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This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 9
Q1 | The type of capacitors used in communication transmitters are?
- electrolyte capacitor
- variable capacitor
- air capacitor
- glass capacitor
Q2 | Which capacitors relatively costly?
- electrolyte capacitor
- mica capacitor
- air capacitor
- glass capacitor
Q3 | capacitors have a high leakage voltage.
- electrolyte capacitor
- variable capacitor
- c) air capacitor
- polyester capacitor
Q4 | The force between two charges is 120 N. If the distance between the charges is doubled,the force will be
- 60 n
- 30 n
- 40 n
- 15 n
Q5 | The electric field intensity at a point situated 4 metres from a point charge is 200 N/C. Ifthe distance is reduced to 2 metres, the field intensity will be
- 400 n/c
- 600 n/c
- 800 n/c
- 1200 n/c
Q6 | The lines of force due to charged particles are
- always straight
- always curved
- sometimes curved
- none of the above
Q7 | The electric field at a point situated at a distance d from straight charged conductor is
- proportional to d
- inversely proportional to d
- inversely proportional to d
- none of the above
Q8 | The direction of electric field due +0 positive charge is .
- away from the charge
- towards the charge
- both (a) and (6)
- none of the above
Q9 | A field line and an equipotential surface are
- always parallel
- always at 90°
- inclined at any angle 0
- none of the above
Q10 | The ability of charged bodies to exert force on 6ne another is attributed to the existenceof
- electrons
- protons
- neutrons
- electric field
Q11 | If the sheet of a bakelite is inserted between the plates of an air capacitor, thecapacitance will
- decrease
- increase
- remains unchanged
- become zero
Q12 | A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is
- 0.024 f
- 0.12 f
- 0.6 f
- 0.8 f
Q13 | For making a capacitor, it is better to select a dielectric having
- low permittivity
- high permittivity
- permittivity same as that of air
- permittivity slightly more than that of air
Q14 | The units of capacitance are
- volts/coulomb
- coulombs/volt
- ohms
- henry/wb
Q15 | If three 10 uF capacitors are connected in parallel, the net cararitance is
- 20 uf
- 30 ue
- 40 uf
- 50 uf
Q16 | A dielectric material must be
- resistor
- insulator
- good conductor
- semi conductor
Q17 | Which of the following is not a vector ?
- linear momentum
- angular momentum
- electric field
- electric potential
Q18 | Two plates of a parallel plate capacitor after being charged from a constant voltagesource are separated apart by means of insulated handles, then the
- voltage across the plates increases
- voltage across the plates decreases
- charge on the capacitor decreases
- charge on the capacitor increases
Q19 | If A.C. voltage is applied to capacitive circuit, the alternating current can flow in thecircuit because
- varying voltage produces the charg¬ing and dicharging currents
- of high peak value
- charging current can flow
- discharge current can flow
Q20 | The dissipation factor of a good dielectric is of the order of
- 0.0002
- 0.002
- 0.02
- 0.2
Q21 | Three capacitors each of the capacity C are given. The resultant capacity 2/3 Ccan be obtained by using them
- all in series
- all in parallel
- two in parallel and third in series with this combination
- two in series and third in parallel across this combination
Q22 | For which of the following parameter variation, the capacitance of the capacitorremains unaffected ?
- distance between plates
- area of the plates
- nature of dielectric
- thickness of the plates
Q23 | Which of the following statement is true ?
- the current in the discharging capacitor grows linearly
- the current in the dicharging capacitor grows exponentially
- the current in the discharging capacitor decays exponentially
- the current in the discharging capacitor decreases constantly
Q24 | Which of the following expression is correct for electric field strength ?
- e = d/e
- e = d2/t
- e = jtd
- e= nd2
Q25 | In a capacitor the electric charge is stored in
- metal plates
- dielectric
- both (a) and (6)
- none of the above