STUPIDSID
Answer any one question from Q1 and Q2
1 (a)
Explain following instructions of 8051 microcontroller quoting suitable examples.
(i) ORL A, #data (ii) RRC A (iii) RET
(i) ORL A, #data (ii) RRC A (iii) RET
6 M
1 (b)
Differentiate between asynchronous and synchronous data transfer.
6 M
2 (a)
Explain the use of following registers associated with 8051 microcontroller. i) DPTR
ii) Program Counter
ii) Program Counter
6 M
2 (b)
What are Timer0 (T0) and Timer1 (T1) registers supported by 8051 microcontroller? How are these started and stopped?
6 M
Answer any one question from Q3 and Q4
3 (a)
Draw and explain characteristics of DC shunt and series motors.
6 M
3 (b)
A 50 Hz, 8 pole, 3 phase induction motor has full load slip of 4%. The rotor resistance is 0.001 ohm/phase and standstill reactance is 0.005 ohm/phase. Find i) the ratio of maximum torque to full load torque ii) the speed at which maximum torque occurs.
6 M
4 (a)
A 230V DC shunt motor has armature resistance of 0.2 Ohm and field resistance of 115 Ohm. It runs at 1500 RPM and draws a current of 50 A on full load. Calculate its speed at half load condition.
7 M
4 (b)
Distinguish between squirrel cage and slip ring induction motors.
6 M
Answer any one question from Q5 and Q6
5 (a)
Compare analog voltmeter and digital voltmeter.
6 M
5 (b)
Explain working of CRO with the help of schematic showing its various parts.
6 M
6 (a)
Explain working of digital frequency counter with the help of block diagram.
6 M
6 (b)
State advantages of digital multimeter. Mention typical specifications of digital multimeter.
6 M
Answer any one question from Q7 and Q8
7 (a)
Explain the sphere gap method used for measurement of peak value of voltage.
7 M
7 (b)
Two-wattmeter method is used for measurement of input power of a three phase induction motor. If two wattmeter readings are 1700 watts and 1100 watts; determine i) input power to motor ii) power factor of the motor iii) input current drawn from 440 V, 3 phase AC supply.
6 M
8 (a)
What is Wien's Bridge? Derive expression for frequency of Wien's Bridge.
7 M
8 (b)
Explain one wattmeter method used for measuring reactive power of a three phase balanced load with the help of connection diagram and phasor diagram.
6 M
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