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This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 11
Q1 | Dielectric constant for mica is nearly
- 200
- 100
- 3 to 8
- 1 to 2
Q2 | The value of dielectric constant for vacuum is taken as
- zero
- 1
- 4
- 10
Q3 | Which of the following capacitors is marked for polarity ?
- air
- paper
- mica
- electrolytic
Q4 | Which of the following capacitors can be used for temperature compensation ?
- air capacitor
- ceramic capacitor
- paper capacitor
- none of the above
Q5 | Which of the following statements is incorrect ?
- the thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor .
- a six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pf
- capacitors in series provide less capacitance but a higher voltage breakdown rating for the combina¬tion
- a capacitor can store charge be¬cause it has a dielectric between two conductors
Q6 | For closer tolerances which of the following capacitors is usually preferred ?
- paper capacitor
- mica capacitor
- ceramic disc capacitor
- none of the above
Q7 | The electrostatic force between two charges of one coulomb each and placed at adistance of 0.5 m will be
- 36 x 10fa
- 36 x 107 n
- 36 x 108 n
- 36 x 109 n
Q8 | The dielectric constant (relative permittivity) of glass is given by
- 0.1 to 0.4
- 0.5 to 1.0
- 2.0 to 4.0
- 5 to 100
Q9 | capacitors are used in transistor circuits.
- ceramic
- paper
- air
- electrolytic
Q10 | capacitors are used for audio frequency and radio frequency coupling and tuning.
- air
- mica
- plastic film
- ceramic
Q11 | The inverse of capacitance is called
- reluctance
- conductance
- susceptance
- elastance
Q12 | When the dielectric is homogeneous,the potential gradient is
- uniform
- non-uniform
- zero
- any of the above
Q13 | The potential gradient across the material of low permittivity is than across thematerial of high permittivity.
- smaller
- greater
- both (a) and (b)
- none of the above
Q14 | field is associated with the capacitor.
- electric
- magnetic
- both (a) and (b)
- none of the above
Q15 | A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V.The energy stored in the capacitor is
- 50 joules
- 150 joules
- 200 joules
- 250 joules
Q16 | A single core cable used on 33000 V has conductor diameter 10 mm and the in¬ternaldiameter of sheath 25 mm. The maximum electrostatic stress in the cable is
- 62 x 105 v/m
- 72 x 105 v/m
- 82 x 105 v/m
- 92 x 105 v/m
Q17 | The total deficiency or excess of electrons in a body is known as
- current
- voltage
- potential gradient
- charge
Q18 | The relative permittivity has the following units
- f/m
- m/f
- wb/m
- no units
Q19 | The phenomenon of an uncharged body getting charged merely by the nearness of acharged body is known as
- pholoelectric effect
- chemical effect
- magnetic effect
- induction
Q20 | A unit tube of flux is known as tube
- newton
- faraday
- michale
- none of the above
Q21 | The value of E within the field due to a point charge can be found with the help of
- faraday\s laws
- kirchhoff s laws
- coulomb\s laws
- none of the above
Q22 | Electric intensity at any point in an electric field is equal to the at that point.
- electric flux
- magnetic flux density
- potential gradient
- none of the above
Q23 | Electric displacement is a quantity.
- scalar
- vector
- both of the above
- none of the above
Q24 | The unit of dielectric strength is given by
- v/m
- v2/m
- m/v
- m/v2