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BASIC ELECTRICAL and ELECTRONICS ENGINEERING, compilation of exams, Study notes of Network Theory

Jamia Millia IslamiaNetwork Theory

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) Total power consumed. (d) Power factor of the load. variable capacitance, Flip - Flops, Flip - Flop, offsets and drift, slew rate, bandwidth and frequency com- pensation, Wien Bridge Oscillator, amplifiers

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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
โ‹†โ‹†โ‹†โ‹†โ‹†
1. Three impedances, each consisting of 20 โ„ฆ resistance and 18 โ„ฆ 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= 20ยตH 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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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 โ‹† โ‹† โ‹† โ‹† โ‹†

  1. Three impedances, each consisting of 20 ฮฉ resistance and 18 ฮฉ 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.

  1. Draw and explain the no load and load characteristics of dc shunt generator. [16]
  2. (a) Compare between spring and gravity control. [8] (b) Explain with neat sketch the air friction damping. [8]
  3. (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]
  4. Explain the working of UJT and derive the expression for intrinsic stand off ratio. [16]
  5. 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]

  1. A Hartley oscillator is designed with L 1 = 2mH, L 2 = 20ฮผH 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]
  2. (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]

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 โ‹† โ‹† โ‹† โ‹† โ‹†

  1. Three identical coils having a resistance of 10 ฮฉ 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]

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 โ‹† โ‹† โ‹† โ‹† โ‹†

  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

  1. (a) Discuss the various three phase transformer groups and their significance. [12] (b) Compare the commonly used three phase connections. [4]
  2. What do you understand by attraction type and repulsion type instruments? What are the important difference between moving coil and moving iron instruments?[16]
  3. What is Hall effect and what is are applications? [16]
  4. With a neat diagram explain the construction, operation equivalent circuit and characteristics of UJT. [16]
  5. (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]
  6. Draw the circuit of Wien Bridge Oscillator. Derive the transfer function b and explain how it satisfies the condition for oscillation. [16]
  7. (a) Explain the following in an Asynchronous sequential circuit i. Excitation Table. ii. Transistor Table. [6]

(b) An asynchronous sequential circuit has two inputs X 1 andX 2 and one output X, X = 1. If X 1 changes from 0 to 1 and Z = 0, if X 2 changes from 0 to 1. Realize the circuit using JK Flip Flops. [10]