QP Code
1
6
0
0
5
3
Register Number
VELALAR COLLEGE OF ENGINEERING AND TECHNOLOGY
(An Autonomous Institution, Affiliated to Anna University, Chennai)
Semester Examinations April May 2017
Regulations-2016
Programme:
B.E/B.Tech
Semester:
1
Max. Marks:
100
Duration
3 Hrs
Course Code Title:
16EET21
BASIC ELECTRICAL AND ELECTRONICS ENGINEERING
Knowledge Levels
K1 Remembering
K3 Applying
K5 Evaluating
K2 Understanding
K4 Analyzing
K6 Creating
Part A Answer ALL Questions. 10 x 2 20 Marks
No.
Question
KL
1.
An electric heater draws 8A for 250V supply. Calculate the power rating.
K3
2.
State Kirchoff's voltage law.
K1
3.
Define form factor.
K1
4.
Define admittance.
K1
5.
State Fleming's left hand rule.
K1
6.
List the characteristics of DC shunt motor.
K1
7.
Define 'Avalanche breakdown'.
K1
8.
Mention the applications of a transistor.
K2
9.
Using complement method, perform (28)10 (15)10.
K3
10.
Which gates are called as universal gates?
K2
Part B Answer ALL Questions. 5 x 16 80 Marks
No
Question
Marks
KL
11.
a
i.
Define the terms Voltage, Current,Power and Energy.
8
K1
ii.
Three resistors B and C connected in parallel take a total current of 12A from the supply. IB 2 IA and IC 3.5 IB. If the total power taken is 3 kW, calculate the current taken by the loads the supply voltage.
8
K3
OR
b
i.
Find the current through the resistor shown in figure
6
K3
ii.
Explain the basic principle and construction of permanent magnet moving coil instruments with neat diagram
10
K4
12.
a
i.
Define RMS Value, Average Value and Peak Factor for sinusoidal waveform.
6
K1
ii.
Derive the magnitude of voltage and current for series circuit. Also derive the expression for power factor when XL XC and XC XL. Explain through the phasor diagram.
10
K3
OR
b
i.
With neat sketches, explain the principle and construction of moving iron instruments.
10
K4
ii.
Derive voltage, current and power expression when three phase windings are connected in delta connections.
6
K3
13.
a
With neat diagram, explain the construction and working principle of DC generator.
16
K4
OR
b
With neat diagram, explain the construction and working principle of DC motor.
16
K4
14.
a
i.
Explain the V-I characteristics of PN diode in both forward and reverse bias condition with neat diagram.
10
K4
ii.
Draw the circuit diagram of full wave rectifier and explain its operations with the help of waveform.
6
K4
OR
b
Explain the input and output characteristics of a transistor in CE configuration.
16
K4
15.
a
i.
Prove the following using Boolean algebra:
1.
2.
10
K3
ii.
State and prove DeMorgan's theorem.
6
K1
OR
b
i.
Design and Implement half adder and full-adder using logic gates.
16
K6