Janardan Rai Nagar Rajasthan Vidyapeeth 2006 B.Tech ELECTRICAL TECHNOLOGY - Question Paper

Model Question Paper

BF4-ELECTRICAL TECHNOLOGY

Time : 3 hrs Maximum marks : 75

 

Instruction:

1. Question paper is divided into Group A, Group B and Group C

2. Each Group is 25 Marks

3. Figure to the right in bracket indicates marks.

4. Good Handwriting is expected

5. Assume suitable data if necessary.

 

Group A (25 Marks)

 

Answer any three questions (Question 1 is compulsory)

(5)

Q.1 Explain Force, weight and electrical energy

(10)

Q.2 Define

(a) Magnetic Flux (b) Magnetic Field (c) Field Intensity (d) Flux Density.

(10)

(10)

Q.3 What is Ohms Law ? Explain kirchoffs current law and Kirchoffs voltage law ?

(10)

Q.4 What is an ideal transformer, is such a transformer possible ?

Q.5 Estimate the inductance of a solenoid of 2500 turns, uniformly wound over a length of 0.

meter on a cylindrical paper tube, 10 cm is the diameter. The medium is air.

Group B (25 Marks)

 

Answer any three questions (Questions 6 is compulsory)

 

Q.6 Find the capacitance of a parallel plate capacitor Area of each plate is 50 cm² and distance

(5)

between plate is 0.2mm . The medium is Air. For an applied voltage of 100V find charge,

electric flux density and electric field strength.

(10)

Q.7 A coil has 500 turns. It is wound on an non magnetic core and has inductance of

9mH. a) Find the Flux produced by a current of 6 A. b) If this 6A current is reversed

(10)

in 8 milliseconds. Find the emf induced

 

	(10)

 

Q.8 Explain Nickel Cadmium Cell ?

Q.9 A Series R-L Circuit has a resistance of 9 ohms and an inductive reactance of 12 ohms.

When voltage v is applied, the current is i=28.3 sin 314t Find Z, V, L ,P And Power

(10)

Factor. Draw Phasor Diagram.

(10)

Q.10. (a) Differentiate Primary cells and Secondary cells.

(b) Draw the neat sketch and explain the construction and operation of Lead Acid

 

Group C (25 Marks)

All Questions are Compulsory.

Q.11 Fill in the blanks ( each question carry 2 marks)

1. Ohm meter is unit of ___________

2. In magnetic circuit flux is equal to __________.

3. If the two charges Q1 and Q2 are separated by a distance r Force is__________

4. Ferromagnetic material lose their _______ properties at a certain temperature is called as_________.

5. Permeability of magnetic material corresponds to_________ in conducting material as_________.

 

Q.11 Multiple choice question. (Each question carry 2 marks)

 

1. The perfect magnetic insulator is

(a) iron (b) rubber (c) copper (d) None of the above

2. Diamagnetic materials are ______

(a) Nickel (b) Silver, Copper (c) Copper, Aluminium (d) None of these

3. IF the conductor is at 90 the direction of the field =90 the force on the conductor is

(a) BIL ( b) 0 (c) 1 (d) BIL Sin?

4. The hystersis loss in a magnetic material depends up on

1. area of hystersis loop
2. frequency of reversal of field
3. volume of magnetic material
4. all a,b and c

 

5. The direction of Electro-magnetically induced e.m.f. is determined by

1. Fleming right hand rule
2. Lenzs rule
3. Right hand thumb rule
4. Both a and b

Q.11 True or false (each question carry 1 marks).

 

1. A capacitor should have low losses.

2. Voltage is a form of potential energy.

3. Lead-Acid battery is primary cell.

4. The of conductivity is ohm-meter.

 

5.Coulomb first law states the force between two point charges is proportional to the square of the

distance between them.

 

 

 

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