51. How is the protection and security for an embedded system made?
a) Security chips
b) Memory disk security
c) IPR
d) OTP
Answer: c
Intellectual property right provides security and protection to embedded systems.
52. Which of the following task swapping method is a better choice in the embedded systems design?
a) time slice
b) RMS
c) cooperative multitasking
d) pre-emptive
Answer: d
The pre-emptive method of task swapping is the first choice for embedded system design because of its better system response.
53. Which type of memory is suitable for low volume production of embedded systems?
a) Non-volatile
b) RAM
c) Volatile
d) ROM
Answer: a
The devices which use non-volatile memory allow the software to be downloaded and returned to the device. UV erasable EPROM is favorable but EEPROM is also gaining favor. Therefore, this type of memory is used in low-volume production.
54. Which activity is concerned with identifying the task at the final embedded systems?
a) scheduling
b) task-level concurrency management
c) high-level transformation
d) compilation
Answer: b
There are many design activities associated with the platforms in the embedded system and one such is the task-level concurrency management which helps in identifying the task that needed to be present in the final embedded systems.
55. Which level simulates the algorithms that are used within the embedded systems?
a) algorithmic level
b) switch level
c) gate level
d) circuit level
Answer: a
The algorithmic level simulates the algorithm which is used within the embedded system.
56. How does an embedded system communicate with the outside world?
a) Memory
b) Output
c) Peripherals
d) Input
Answer: c
The system communicates with the outside world through peripherals.
57. Which of the following helps in reducing the energy consumption of the embedded system?
a) emulator
b) debugger
c) simulator
d) compilers
Answer: d
The compilers can reduce the energy consumption of the embedded system and the compilers performing the energy optimizations are available.
58. What is the purpose of the memory refresh register of Z80?
a) To control on-chip SRAM
b) To control on-chip DRAM
c) To clear cache
d) To control ROM
Answer: b
In addition to the general-purpose registers, a stack pointer, program counter, and two index registers are included in Z80. It was also used in many embedded designs because of its high-quality performance and for its in-built refresh circuitry for DRAMs.
59. What does MESI stand for?
a) modified exclusive system input
b) modifies embedded shared invalid
c) modified exclusive shared invalid
d) modified exclusive stale invalid
Answer: c
The MESI protocol supports a shared state which is a formal mechanism for controlling the cache coherency by using the bus snooping techniques. MESI refers to the states that cached data can access. In the MESI protocol, multiple processors can cache shared data.
60. Which of the following is the pin efficient method of communicating between other devices?
a) memory port
b) peripheral port
c) parallel port
d) serial port
Answer: d
The serial ports are considered to be the pin efficient method of communication between other devices within an embedded system.
