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Hardware engineer

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9 questions · about 5 minutes · no timer

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Stage 1 · Computer hardwareWhich way do the electrons in the wire drift while the bulb is lit?

From − to +, opposite to conventional currentThey do not move at allFrom + to −, the same way as conventional currentBack and forth, never round the loopNot sure yet

Stage 1 · Computer hardwareIn a leader-follower D flip-flop, which latch is open while the clock is 0?

Only the followerBoth of themNeither of themOnly the leaderNot sure yet

Stage 1 · Computer hardwareWhich of these can a JTAG or SWD debugger NOT do on its own?

Single-step one instructionMeasure the 3.3 V rail's voltageHalt the CPU and read its registersWrite a program into the chip's flashNot sure yet

Stage 2 · Maths for computingWhat is the binary number 1011 in decimal?

111011813Not sure yet

Stage 2 · Maths for computingWhy does one hex digit stand for exactly four bits?

Because 4 is half of 8Because four bits have 16 patterns, and hex has 16 digits (0 to 9, A to F)Because hex was invented for 4-bit computersIt does not: a hex digit is 8 bitsNot sure yet

Stage 2 · Maths for computing2026 in binary is 11111101010. Grouping the bits in fours from the right (111 1110 1010), what is it in hex?

0x7EA0x7E50xFEA0x2026Not sure yet

Stage 3 · C++Which tool turns C++ source code into machine code?

The preprocessorThe linkerThe compilerThe terminalNot sure yet

Stage 3 · C++Continuing from int* p = &x; which line changes x to 8?

&p = 8;int* x = 8;p = 8;*p = 8;Not sure yet

Stage 3 · C++const int k = argc * 3; and later k = 5;. What happens?

The build fails: k is read-onlyk = 5; is quietly ignoredThe program crashes when it reaches k = 5;k becomes 5 while the program runsNot sure yet

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