STUPIDSID
Answer any one question from Q1 and Q2
1 (a)
Explain TMOD register and specify its operating modes.
6 M
1 (b)
Explain different addressing modes supported by 8051 microcontroller.
6 M
2 (a)
What is Program Status Word (PSW) ? State the function of each flag in it.
6 M
2 (b)
Discuss asynchronous and synchronous data transfer formats.
6 M
Answer any one question from Q3 and Q4
3 (a)
Derive the expression for the torque developed in a three- phase induction motor under running conditions. Hence state the equation for maximum torque developed.
6 M
3 (b)
A 200 V, 4 Pole, Lap wound DC shunt motor has 800 conductors on its armature. The resistance of armature winding is 0.5 Ω and that of shunt field winding is 200 Ω. The motor takes current of 21 A and flux per pole is 30 MWb. Find the speed and gross torque developed in armature.
7 M
4 (a)
Explain V/f control method for controlling speed of three-phase induction motor.
6 M
4 (b)
Draw and explain characteristics of DC shunt and series motors.
7 M
Answer any one question from Q5 and Q6
5 (a)
Discuss advantages of digital voltmeters over analog voltmeters. Also mention its limitations.
6 M
5 (b)
Explain working of conventional standard signal generator with the help of neat diagram.
6 M
6 (a)
Explain working of digital multimeter with the help of block diagram.
6 M
6 (b)
Enlist applications of Cathode Ray Oscilloscope (CRO) for measurement of various electrical quantities.
6 M
Answer any one question from Q7 and Q8
7 (a)
Explain two wattmeter method used for measuring three-phase power in a star connected balanced load supplied by symmetrical a.c. with the help of neat connection diagram and phasor diagram.
6 M
7 (b)
What is an AC bridge ? Enlist AC bridges. Derive the general equations for balance of an AC bridge.
7 M
8 (a)
Two wattmeters are connected to measure total power in a
three-phase circuit. One reads 4800 W while the other reads backwards. Over reversing the connections of the later, it reads 400 W. Find total power absorbed and power factor of circuit.
6 M
8 (b)
What is Wien's bridge? Derive the expression for unknown
frequency in terms of bridge parameters.
7 M
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