Top 250+ Solved Electromagnetic Theory MCQ Questions Answer
Q. Dielectric strength of mica is
a. 10 to 20 kV/mm
b. 30 to 50 kV/mm
c. 50 to 200 kV/mm
d. 300 to 500 kV/mm
Q. The dielectric constant (relative permittivity) of glass is given by
a. 0.1 to 0.4
b. 0.5 to 1.0
c. 2.0 to 4.0
d. 5 to 100
Q. capacitors are used for audio frequency and radio frequency coupling and tuning.
a. Air
b. Mica
c. Plastic film
d. Ceramic
Q. When the dielectric is homogeneous,the potential gradient is
a. uniform
b. non-uniform
c. zero
d. any of the above
Q. The potential gradient across the material of low permittivity is than across thematerial of high permittivity.
a. smaller
b. greater
c. both (a) and (b)
d. none of the above
Q. ________field is associated with the capacitor.
a. Electric
b. Magnetic
c. Both (a) and (b)
d. None of the above
Q. A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V.The energy stored in the capacitor is
a. 50 joules
b. 150 joules
c. 200 joules
d. 250 joules
Q. 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
a. 62 x 105 V/m
b. 72 x 105 V/m
c. 82 x 105 V/m
d. 92 x 105 V/m
Q. Two infinite parallel plates 10 mm apart have maintained between them a potentialdifference of 100 V. The acceleration of an electron placed between them is
a. 0.56 x 1015 m/s2
b. 1.5 x 1015 m/s2
c. 1.6 x 1015 m/s2
d. 1.76 x 1015 m/s2
Q. The total deficiency or excess of electrons in a body is known as
a. current
b. voltage
c. potential gradient
d. charge