Embedded System Design Cycle Questions and Answers

Q: None of the following belongs in a production test except

Correct answer: a check that every interface respondsA production test asks one question: was this unit built correctly? Checking that every interface responds does that, quickly and on every unit. The other three are design verification or qualification activities, done once on samples - emissions testing, re-verifying the design against its requirements, and accelerated life testing all prove the design rather than the individual unit.

41.

Which of the following is NOT a purpose of the requirements document?

A.specifying how the software is to be structured internally
B.recording what the product must do
C.recording the constraints the product must satisfy
D.providing something for the acceptance tests to be traced to

Answer: A

Correct answer: specifying how the software is to be structured internally

The requirements document says what the product must do and under what constraints; how it is built is the business of the design documents. Keeping the two separate matters because requirements are traced to acceptance tests and negotiated with the customer, while the internal structure may be revised freely so long as the requirements are still met.

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42.

A project's schedule slips because the custom board arrives six weeks late. The measure that would have protected it is

A.increasing the size of the software team
B.developing the software against a development board in the interim
C.ordering the board earlier without waiting for the design to be complete
D.reducing the scope of the firmware

Answer: B

Almost everything except the board-specific bring-up can be written and tested on an evaluation board with the same processor, which takes the hardware off the software's critical path. It is the standard mitigation for exactly this risk.

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43.

An engineer proposes to skip the traceability matrix to save time on a safety-related product. The correct response is

A.the matrix can be reconstructed after certification has been granted
B.the matrix applies only to hardware requirements
C.the matrix is required evidence and cannot be omitted
D.the matrix may be omitted if the tests all pass

Answer: C

The assessor asks how each requirement is known to be met, and the answer must be recorded rather than remembered. Reconstructing it afterwards is far more work than keeping it, and a reconstruction carries much less weight.

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44.

Comparing a waterfall and an iterative approach for a product whose requirements are not yet settled, the iterative approach

A.guarantees that the schedule will be met
B.removes the need for a requirements document altogether
C.is unsuitable wherever hardware is involved
D.surfaces the misunderstanding earlier, when it is cheap

Answer: D

Building something small and showing it is the fastest way to discover what the customer actually meant, which a document review often fails to reveal. Requirements are still written down, and the hardware iterates in fewer and larger steps than the software.

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45.

None of the following belongs in a production test except

A.a check that every interface responds
B.a measurement of the product's electromagnetic emissions
C.a re-verification that the design meets its requirements
D.an accelerated life test of the assembled unit

Answer: A

Correct answer: a check that every interface responds

A production test asks one question: was this unit built correctly? Checking that every interface responds does that, quickly and on every unit. The other three are design verification or qualification activities, done once on samples - emissions testing, re-verifying the design against its requirements, and accelerated life testing all prove the design rather than the individual unit.

Discuss in Forum

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Embedded System Design Cycle Questions and Answers

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