Dielectric Materials » Exercise – 1
11. Mica is a :
(a) Dielectric material
(b) Insulating material
(c) Magnetic material
(d) Both insulating and dielectric materialSubject Name : Electronics Engineering Exam Name : IIT GATE, UPSC ESE, RRB, SSC, DMRC, NMRC, BSNL, DRDO, ISRO, BARC, NIELIT Posts Name : Assistant Engineer, Management Trainee, Junior Engineer, Technical Assistant Electronics & Communication Engineering Books
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Dielectric Materials » Exercise - 1 1. On introducing a dielectric medium in between the plates of a capacitor, one of the following quantities will not change : (a) Charge storing capacity (b) Potential difference (c) Electric field strength (d) Electric flux density 2. Exposure of insulating material to moisture causes an increase in : (a) Dielectric loss (b) Dielectric constant (c) Dielectric strength (d) Insulation resistance 3. Dielectric materials are essentially : (a) Insulating materials (b) Ferro-electric materials (c) Ferri-electric materials (d) Superconducting materials 4. On placing a dielectric in an electric field, the field strength : (a) Increases (b) Decreases (c) Remains constant (d) Reduces to zero 5. Dielectric constant relates to : (a) Comparative charge stored for a given material versus air (b) The fact that the dielectric doesn’t have charge characteristics (c) The insulating properties of the non-conducting mediums (d) None of the above 6. Since dielectric materials are nonconductive : (a) Capacitors leakage resistance is finite (b) Capacitors leakage resistance is infinite (c) A capacitor cannot pass current through the circuit (d) None of the above 7. Materials which can store electrical energy are called : (a) magnetic materials (b) semi conductors (c) dielectric materials (d) super conductors 8. The dielectric constant of air…- Dielectric Materials » Exercise - 19. Dielectric materials are : (a) Insulating materials (b) Semiconducting materials (c) Magnetic materials (d) Ferroelectric materials
- Dielectric Materials » Exercise - 13. Dielectric materials are essentially : (a) Insulating materials (b) Ferro-electric materials (c) Ferri-electric materials (d) Superconducting materials
- Dielectric Materials » Exercise - 12. Exposure of insulating material to moisture causes an increase in : (a) Dielectric loss (b) Dielectric constant (c) Dielectric strength (d) Insulation resistance
- Magnetic Materials » Exercise - 1 1. The covers of electrical machines are made of : (a) soft magnetic materials (b) hard magnetic materials (c) super conductors (d) semiconductors 2. The critical temperature above which the ferromagnetic materials loose their magnetic property is known as : (a) hysterisis (b) Curie point (c) transition temperature (d) standard temperature 3. Permanent magnets are made of : (a) soft magnetic materials (b) hard magnetic materials (c) semi conductors (d) super conductors 4. Materials, which provide a path to the magnetic flux, are classified as : (a) insulating materials (b) semi conducting materials (c) magnetic materials (d) dielectric materials 5. Ferrites are : (a) ferromagnetic material (b) ferrimagnetic materials (c) anti ferromagnetic material (d) diamagnetic materials 6. The relative permeability of a paramagnetic substance is : (a) unity (b) slightly more than unity (c) zero (d) less than unity 7. Ferroelectric materials are characterised by : (a) Very high degree of polarisation (b) A sharp dependence of polarisation on temperature (c) Non-linear dependence of the charge Q on the applied voltage (d) All the above 8. In a ferromagnetic material the state of flux density is as follows when external magnetic field is applied to it. (a) Increased (b) Decreased (c) Remains unchanged…