Electrical Engineering Dipartment
Assignment: Chapter 2 Date: 14-8-2018
Subject: Microprocessors and Controllers Applications
Sem: V. Term: 18-06-2018 to 22-10-2018
Q-1. Give answers in short. (2 marks)
(1) Which interrupt (in 8085 microprocessor) has highest priority? Give jump address of it.
(2) Explain the role of HOLD and HLDA pins.
(3) Classify instructions in order of numbers of byte (for 8085). Give example of each.
(4) If we connect 12 Mhz crystal between X1 and X2, what will be the operating frequency of 8085?
(5) What are instruction, opcode and operand?
(6) Explain function and importance of Program Counter.
(7) What will happen after executing the instruction LDA 3055h ?
Q-2 Give answers with brief description. (5 marks)
(1) Give advantages and disadvantages of microprocessor based control.
(2) Draw the pin diagram of 8085 microprocessor and explain Address bus and Address/Data bus.
(3) Write short note on different types of registers of 8085 microprocessor.
(4) State different types of addressing modes in 8085 microprocessor. Explain Immediate addressing with suitable example.
(5) What is multiplexed address/data bus? How ALE is used to demultiplex it.
(6) Write an assembly language program for 8085 microprocessor to add two 8-bit numbers 22 H and 34 H and store the result in Register C.
(7) Explain the instructions LDAx and STAx for 8085 microprocessor.
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Electrical Engineering Dipartment
Assignment: Chapter 2 Date: 14-8-2018
Subject: Power Electronics
Sem: V. Term: 18-06-2018 to 22-10-2018
Q-1. Give answers in short. (2 marks)
a. Peak working forward off-state voltage
b. dv/dt rating
c. Holding current
d. Forward Breakover Voltage
e. Non-Repetitive Peak Forward off State Voltage
f. Explain IRMS and ITAV.
Q-2. Give answers with brief description. (5 marks)
a. Draw and explain di/dt protection of SCR
b. Explain different types of mounting techniques of SCR.
c. What is commutation? Explain natural commutation and forced commutation
d. Explain class A commutation. What are the limitations of class A commutation.
e. Explain class D commutation with necessary circuit diagram and waveforms.
f. Explain role of free wheeling diode with necessary diagram and waveforms. State its advantages.
g. Draw diagram showing all types of protections for SCR.
h. Explain over voltage protection of SCR using Metal Oxide Varister.
i. Draw and explain crowbar circuit for over current protection of SCR.
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by H. I. Joshi, Aug-2018