Download PTU B.Tech 2021 Jan EE 7th Sem 74092 Microcontroller And Plc Question Paper

Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January EE 7th Sem 74092 Microcontroller And Plc Previous Question Paper

Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (EE) PT (Sem.?7)
MICROCONTROLLER AND PLC
Subject Code : BTEE-604
M.Code : 74092
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1)
What is the difference between Microprocessor and Micro-controllers?
2)
What is the use of interrupts in microcontroller? How many interrupts are there in
microcontroller 8051?
3)
How many address bus, data bus and control bus are there in microcontroller 8051?
4)
What is the use of Program Counter and Data Pointer in microcontroller 8051?
5)
Define direct addressing in microcontroller 8051.
6)
Define Flags and Program Status word (PSW) of microcontroller 8051.
7)
How an I/O pin can be act as both an input and output pin.
8)
How many modes of serial data transmission are available in 8051?
9)
Explain the function JC and JNC with one example.
10) What are the different modes of execution of PLC program?
1 | M - 7 4 0 9 2
( S 2 ) - 6 0 4

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SECTION-B
11) With the help of neat and clean block diagram, explain the architecture of 8051 in detail.
12) Explain the structure, concept and timing diagram of an on-delay and off delay PLC timer.
13) Write a program to generate a square wave of period 1 sec on Port P2.1. Use interrupt
programming of timer TO in Mod 1.
14) Construct a lookup table program that converts the hex number in A to an equivalent BCD
number in registers R5(MSB) and R4(LSB).
15) Explain memory mapped I/O and memory address decoding of 8051.
SECTION-C
16) Explain the architecture of CPLD and also discuss its different types and major design
issues.
17) Write the program that will accomplish following task :
a) Exchange the contents of the B register and external RAM address 03CFh.
b) Divide the number in RAM location 2Eh by the number 12h; put the quotient in R4 and
the remainder in R5.
18) Explain the following application of 8051 in detail :
a) Interfacing of LCD display.
b) Digital to analog conversion.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
2 | M - 7 4 0 9 2
( S 2 ) - 6 0 4

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