Semiconductor Materials » Exercise – 1
14. What does a Hall Effect sensor sense ?
(a) Temperature
(b) Moisture
(c) Magnetic fields
(d) Pressure
Subject 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
GATE 2023 Total Info ENGG DIPLOMA UGC NET Total Info IES 2023 Total Info PSUs 2022 Total Info CSIR UGC NET Total Info JAM 2023 Total Info M TECH 2023 Total Info RAILWAY 2022 Total Info
Related Posts
Magnetic Materials » Exercise - 14. 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- Semiconductor Materials » Exercise - 277. In P-type semiconductor : (a) n=p (b) p (c) n (d) p>>n
- 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…
- Semiconductor Materials » Exercise - 124. When a semiconductor is heavily doped in a range of 1017 to 1018 impurity atoms/cm3, then it behaves as : (a) Intrinsic semiconductor (b) Extrinsic semiconductor (c) Simply as semiconductor (d) Degenerative semiconductor
- Semiconductor Materials » Exercise - 4 151. The addition of a very small quantity of aluminium to a silicon or germanium crystal makes it : (a) A good conductor (b) A good insulator (c) P-type semiconductor (d) N-type semiconductor 152. An intrinsic semiconductor at the absolute zero of temperature : (a) Behaves like a semiconductor (b) Behaves like an insulator (c) Has a few free electrons and same number of holes (d) Has a large number of holes and a few electrons 153. In a substance the conduction band and valence band are separated by a energy gap of the order of 1 eV, and there are at room temperature as money electrons in the conduction band as holes in the valence band. The substance is : (a) An intrinsic semiconductor (b) A p-type semiconductor (c) A N-type semiconductor (d) A doped semiconductor 154. The majority carriers of electricity in a p-type semiconductor are : (a) Free electrons (b) Holes (c) Both electrons and holes (d) Free ions 155. N-type semiconductor is obtained when silicon or germanium is doped by : (a) Phosphorus (b) Boron (c) Aluminium (d) Gallium 156. A p-type semiconductor is : 1. A silicon crystal doped with arsenic impurity. 2. A silicon crystal…