Internet of Things interview questions part 29
Internet of Things interview questions part 29
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Total Questions: 20
1. MAC addresses are used as ________
Correct Answer is : Network addresses
2. IEEE standards for Institute of Electrical and Electronics Engineers.
Correct Answer is : TRUE
3. The original IEEE 802 MAC address comes from________
Correct Answer is : Ethernet address
4. Number of pins in 8051 microcontroller with ________ package.
Correct Answer is : 40 pin with DIP
5. Does an 8051 microcontroller need external oscillator to run?
Correct Answer is : TRUE
6. We use any other frequency source other than crystal oscillator.
Correct Answer is : TRUE
7. Reset work is __________
Correct Answer is : To make program counter zero but values in registers values remain same
8. What is the minimum no of cycles required for reset operation?
Correct Answer is : 1 cycles
9. PSEN stands for ________
Correct Answer is : Program Store Enable
10. Find the machine cycle for AT89C51 if XTAL = 11.0592MHz.
Correct Answer is : 361.68us
11. What is the operation for mode 0?
Correct Answer is : 13-bit timer mode, 8-bit timer/counter THx and TLx as 5-bit prescalar
12. What is the operation for mode 1?
Correct Answer is : 16-bit timer mode, 16-bit timer/counter THx and TLx are cascaded, no prescalar
13. Which is the operation for mode 2?
Correct Answer is : 8-bit auto reload mode, 8-bit auto reload time/counter; THx holds a value which is to be reloaded into TLx each time it overflows
14. Which is the operation for mode 3?
Correct Answer is : Spilt timer mode
15. Function of IE1 in TCON register?
Correct Answer is : External interrupt 1 Edge flag. Not related to timer operations
16. 8051 controller contains how many registers?
Correct Answer is : 2
17. General purpose memory is called as ________
Correct Answer is : RAM memory
18. Which timer register has both timers in it?
Correct Answer is : TMOD
19. What do you mean by micro in microcontroller?
Correct Answer is : Distance between 2 transistors
20. What is the bit size of the 8051 microcontroller?
Correct Answer is : 8-bit
