STUPIDSID
Solve any one question from Q1 and Q2
1 (a)
Draw and explain the architectural block diagram of 8051 microcontroller.
6 M
1 (b)
What is Timer/Counter Control (TCON) register ? Explain the significance of various bits in it.
6 M
2 (a)
What is meant by baud rate ? Differentiate between serial
and parallel data transfer schemes.
6 M
2 (b)
Explain different addressing modes supported by 8051
Microcontroller.
6 M
Solve any one question from Q3 and Q4
3 (a)
State the expression for torque developed in a three-phase
induction motor. Hence obtain:
(i) condition for maximum torque and
(ii) expression for maximum torque.
(i) condition for maximum torque and
(ii) expression for maximum torque.
6 M
3 (b)
Why is a starter required for d.c. motor ? Discuss the
working of three-point starter with the help of neat
Schematic.
7 M
4 (a)
Distinguish between squirrel cage and slip ring induction
Motors.
6 M
4 (b)
A 230 V, 4 pole, lap wound d.c. shunt motor takes no-load
current of 4 A when running at 1200 rpm. The resistance
of armature winding is 0.1 Ω and shunt field winding is 115 Ω. Total brush contact drop is 2 V. If it takes current
of 60 A on full load, calculate its full load speed. Assume
that flux gets weakened by 5% on full load condition due to
armature reaction.
7 M
Solve any one question from Q5 and Q6
5 (a)
Draw the block diagram showing basic structure of CRO and
explain the function of various components.
6 M
5 (b)
Explain the working of audio signal generator with the help
of block diagram.
6 M
6 (a)
Explain the working of digital multimeter with the help of
block diagram.
6 M
6 (b)
Compare analog and digital voltmeters.
6 M
Solve any one question from Q7 and Q8
7 (a)
Explain single wattmeter method for measuring three-phase
reactive power in delta connected balanced load with the help
of neat circuit diagram and phasor diagram.
6 M
7 (b)
What is an A.C. bridge ? Enlist A.C. bridges. Derive the general
equations for balance of an A.C. bridge.
7 M
8 (a)
State advantages and disadvantages of electrostatic instruments.
6 M
8 (b)
A 3-phase, 400 V, 50 Hz a.c. motor is working on certain
load having 0.5 lag power factor. Two wattmeters are connected
to measure input power of the motor which show total power
of 40 kW. Find reading of each wattmeter and total reactive
power of motor.
7 M
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