# BASIC ELECTRICAL and ELECTRONICS ENGINEERING, compilation of exams, Study notes for Network Theory. Jamia Millia Islamia

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B.Tech Semester Regular Examinations, June 2009 BASIC ELECTRICAL AND ELECTRONICS ENGINEERING impedances, resistance, reactance in series, connected in star,shunt generator, (a) line current . (b) Phase current. (c) Tota...
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Code No: R07A10201 Set No. 1

I B.Tech Semester Regular Examinations, June 2009 BASIC ELECTRICAL AND ELECTRONICS ENGINEERING

(Bio-Technology) Time: 3 hours Max Marks: 80

Answer any FIVE Questions All Questions carry equal marks

⋆ ⋆ ⋆ ⋆ ⋆

1. Three impedances, each consisting of 20 Ω resistance and 18 Ω inductive reactance in series, connected in star, are across a 400V, 3 phase supply. Calculate [16]

(a) line current .

(b) Phase current.

(c) Total power consumed.

(d) Power factor of the load.

2. Draw and explain the no load and load characteristics of dc shunt generator. [16]

3. (a) Compare between spring and gravity control. [8]

(b) Explain with neat sketch the air friction damping. [8]

4. (a) Give the energy band description of semiconductors.Explain various current components. [10]

(b) G1ve the mechanism of hole current flow in a semiconductor. [6]

5. Explain the working of UJT and derive the expression for intrinsic stand off ratio. [16]

6. A transistor rated for a maximum collector dissipation of 10mW operates a single ended class A output stage from a 10V supply. Calculate the approximate values of:

(a) Maximum undistorted ac output power.

(b) Quiscient current.

(c) Turns ratio of the O/P transformer, if the load resistance is 6W.Assume overall and collector efficiency = 0.5. [16]

7. A Hartley oscillator is designed with L1 = 2mH, L2 = 20µH and a variable capac- itance. Determine the range of capacitance values is the frequency of oscillation is varied from 2050 KHz to 3050 KHz. [16]

8. (a) What is a Flip Flop? Explain the principle of operation of S-R Flip Flop with Truth Table.

(b) Design a synchrounous counter which counts through the sequence 0, 3, 6, 9, 12, 15, 0. Use D Flip - Flops. [16]

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Code No: R07A10201 Set No. 2

I B.Tech Semester Regular Examinations, June 2009 BASIC ELECTRICAL AND ELECTRONICS ENGINEERING

(Bio-Technology) Time: 3 hours Max Marks: 80

Answer any FIVE Questions All Questions carry equal marks

⋆ ⋆ ⋆ ⋆ ⋆

1. Three identical coils having a resistance of 10 Ω and an inductance of 0.05 H each, are connected in star across a 3 phase, 400 V, 50 Hz balanced supply. Calculate the line current and the power consumed. What will be the readings of the two watt meters connected to measure the total power? [16]

2. (a) Discuss the various three phase transformer groups and their significance. [12]

(b) Compare the commonly used three phase connections. [4]

3. Justify the necessity of controlling torque in indicating instruments. Discuss the various methods of producing the same. Compare them. [16]

4. Draw and explain V-I characteristics ofa zener junction and show how a zener diode acts as voltage regulator. [16]

5. Analyze CE fixed bias configuration with relevant network models. [16]

6. Derive the expressions for input resistance, output resistance, voltage and current gain of a CE amplifier with voltage divider bias using hybrid model only. [16]

7. (a) Explain the terms offsets and drift, slew rate, bandwidth and frequency com- pensation.

(b) What are the different modes of operation of operational amplifier? Derive the expression for the gain of each mode of operation. [16]

8. (a) List out the characteristics of computers.

(b) With a neat block diagram, explain the operation of computer.

(c) Make the following number conversion:

i. (23.6) 10 = ()

2 .

ii. (C5E2) 16 = ()

2 .

iii. (F8Ey) 10 = ()

10 . [16]

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Code No: R07A10201 Set No. 3

I B.Tech Semester Regular Examinations, June 2009 BASIC ELECTRICAL AND ELECTRONICS ENGINEERING

(Bio-Technology) Time: 3 hours Max Marks: 80

Answer any FIVE Questions All Questions carry equal marks

⋆ ⋆ ⋆ ⋆ ⋆

1. A balanced star connected load of 8+j8 Ω / phase is connected to a 3 phase, 200V, 50c/s supply. Find the line current, power factor, power, reactive volt amperes and total volt amperes. [16]

2. Describe the constructional features of a dc machine with neat sketch. [16]

3. What do you understand by attraction type and repulsion type instruments? What are the important difference between moving coil and moving iron instruments?[16]

4. What is a zener diode? Draw the equivalent circuit of an ideal zener in the break- down region. Why is zener diode used as a voltage regulator? [16]

5. Explain the following:

(a) Emitter region is highly doped.

(b) Base region is narrow.

(c) Transistor is called ?transfer resistor‘. [16]

6. With a neat sketch, explain the principle and operation of CE amplifiers using small signal model device and derive an expression for its performance measures. [16]

7. (a) Draw the circuit diagram of RC phase shift oscillator and explain its operation.

(b) What are the advantages and disadvantages of Wien Bridge Oscillator? [16]

8. (a) Compare the performance of synchronous circuits with Asynchronous circuits in relation to

i. Races.

ii. hazards.

(b) Give the steps for analyzing the asynchronous sequential circuits. [16]

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Code No: R07A10201 Set No. 4

I B.Tech Semester Regular Examinations, June 2009 BASIC ELECTRICAL AND ELECTRONICS ENGINEERING

(Bio-Technology) Time: 3 hours Max Marks: 80

Answer any FIVE Questions All Questions carry equal marks

⋆ ⋆ ⋆ ⋆ ⋆

1. (a) Define RMS value and Average value. [4]

(b) Determine the equivalent resistance between the terminals A and B in the circuit shown in figure 1b. [12]

Figure 1b

2. (a) Discuss the various three phase transformer groups and their significance. [12]

(b) Compare the commonly used three phase connections. [4]

3. What do you understand by attraction type and repulsion type instruments? What are the important difference between moving coil and moving iron instruments?[16]

4. What is Hall effect and what is are applications? [16]

5. With a neat diagram explain the construction, operation equivalent circuit and characteristics of UJT. [16]

6. (a) Draw the frequency response of a single stage RC coupled amplifier and explain the reason for its variable slopes . [10]

(b) If the upper cut off frequency of a single stage RC coupled amplifier is 100 KHz, what is the overall upper cut off frequency if five such stages are connected.[6]

7. Draw the circuit of Wien Bridge Oscillator. Derive the transfer function b and explain how it satisfies the condition for oscillation. [16]

8. (a) Explain the following in an Asynchronous sequential circuit

i. Excitation Table.

ii. Transistor Table. [6]

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Code No: R07A10201 Set No. 4

(b) An asynchronous sequential circuit has two inputs X1andX2 and one output X, X = 1. If X1 changes from 0 to 1 and Z = 0, if X2 changes from 0 to 1. Realize the circuit using JK Flip Flops. [10]

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