Tuesday, September 6, 2016
- Tuesday, September 06, 2016
- PunjabtechnicalUniversity ajay gour
- 3rd Semester Electrical(D), Electrical Engineering Materials Electrical(D) 3rd
- No comments
S.B. Roll No.______
ELECTRICAL ENGINEERING MATERIALS
Duration: 3 hrs.
1. Choose the correct one
a. Resistivity of copper at absolute zero is
i. 1.56 µ ohm-cm
ii. 3.12 µ ohm-cm
iii. 6.62 µ ohm-cm
iv. Negligibly small
b. Insulating material used in spark plugs is
c. The permeability of iron can be increased by
i. Purifying it
ii. Reducing carbon percentage
iii. Increasing carbon percentage
iv. Afoying with cobalt
d. Which of the following is not the characteristics of glass
i. Brittle and hard
ii. High chemical resistance
iii. Electrodes of thermionic valves
iv. Pressure sensitive element
State true or false
a) Resistivity of insulators ranges form 109 to 1018 ohm-cm
b) Magnetostriction is the changes in dimensions of a Ferro-magnetic substance due to
c) The variation of resistance of a semi conductor with temperature is linear.
d) Silicon steels used for electrical purposes have silicon percentage 2.5%
e) The crystal structure of most of the common metal is cubic
Note: Attempt any five questions
a. Explain the following terms:
i. Valence electrons
ii. Band gap
b. What do you mean by temperature coefficient of resistance? Explain
c. What are different applications of superconductors?
d. Explain the following:
ii. Heat resistance
e. What do mean by doping? Explain
f. Sketch the B-H loop of a typical ferromagnetic material and define the coactivity.
g. Discuss the properties of platinum.
h. What do you mean by thermocouple? Explain.
Note: Attempt any three questions
3. Explain the following:
b. Semi conductor
4. Discus properties and applications of following material.
5. Discuss properties and applications of following hard magnetic material.
a. Tungsten steel
b. Cobalt steel
a. Thermosetting plastics
b. Ferromagnetic material
7. Describe the properties and application of following material.
Roll No……….. Total No. of Questions: 07 B.Com. (Sem.-1 st ) FINANCIAL ACCOUNTING Subject Code: BCOP-101 Paper ID: [B1101] ...
punjabtechnicaluniversity.blogspot.in Roll No......................... ... Total No. of Questions : 07] ...
punjabtechnicaluniversity.blogspot.in Click Here for Syllabus of B-Tech 1st Year . http://ptu.ac.in/userfiles/file/engg_syllab/1st_and_...
Business Organisation and Management, Question Paper of B.Com 1st Semester,Download Previous Years Question Paper 2Roll No…….. Total No. of Questions: 07 B.Com (Sem.-1 st ) BUSINESS ORGANIATION AND MANAGEMENT Subject Code: BCOP-102 (2011 &a...
Roll No……. Total No. of Questions:07 B.COM (Sem.-1 st ) BUSINESS MATHEMATICS SUBJECT CODE: BCOP-104 (2011 Batch) PAPER ID: ...
punjabtechnicaluniversity.blogspot.in Roll No. ...................... Total No. of Questions : 13] ...
punjabtechnicaluniversity.blogspot.in Master Of Technology (M-Tech) Syllabus SYLLABUS FOR MASTER OF TECHNOLOGY (M-Tech) Br...
punjabtechnicaluniversity.blogspot.in Click Downlink for Dowload of Scheme and Syllabus of B.Com. Professional Batch 2011onwards ht...
B.Sc. IT (402) (S05) / 102 (New) (Sem. - 4th) BASIC MATHEMATICS – I, Punjab Technical University, PTU, Question paperpunjabtechnicaluniversity.blogspot.in Roll No. ................. Total No. of Questions : 13] ...
punjabtechnicaluniversity.blogspot.in Roll No . ............ Total No. of Questions : 07) ...