AET Digital Electronics and Microprocessors 4

Question 1

In a microprocessor-based avionics system, what is the primary function of the address bus?

Accepted Answer

To specify the memory location or I/O device being accessed

Answer

The address bus carries the binary address output by the CPU to select a specific memory location or I/O device.

Question 2

Which logic gate produces a HIGH output only when all inputs are HIGH?

Accepted Answer

AND gate

Answer

An AND gate output is HIGH only when every input is simultaneously HIGH.

Question 3

A D-type flip-flop in an avionics data register is clocked on the rising edge. What happens to the output Q when the clock transitions from LOW to HIGH?

Accepted Answer

Q takes on the value present at the D input at that moment

Answer

On the rising clock edge, a positive-edge-triggered D flip-flop captures and transfers the D input value to Q.

Question 4

In ARINC 429 digital data bus, data words are transmitted:

Accepted Answer

Serially, one bit at a time on a differential pair

Answer

ARINC 429 uses serial transmission of 32-bit words over a shielded twisted-pair differential bus.

Question 5

What does the term 'interrupt latency' refer to in an avionics microprocessor system?

Accepted Answer

The delay between an interrupt request and the CPU beginning its service routine

Answer

Interrupt latency is the elapsed time from when an interrupt is asserted until the CPU executes the first instruction of the interrupt service routine.

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET Digital Electronics and Microprocessors 4