Digital Electronics and Logic Design MCQs | Page - 37

Q. 361) As a technician you are confronted with a TTL circuit board containing dozens of IC chips. You have taken several readings at numerous IC chips, but the readings are inconclusive because of their erratic nature. Of the possible faults listed, select the one that most probably is causing the problem.

Q. 362) Which gate is best used as a basic comparator?

Q. 363) The device shown here is most likely a .

Q. 364) For the device shown here, assume the D input is LOW, both S inputs are HIGH, and the input is HIGH. What is the status of the outputs?

Q. 365) In VHDL, macrofunctions is/are:

Q. 366) Which of the following expressions is in the product-of-sums form?

Q. 367) Which of the following is an important feature of the sum-of-products form of expressions?

Q. 368) An output gate is connected to four input gates; the circuit does not function. Preliminary tests with the DMM indicate that the power is applied; scope tests show that the primary input gate has a pulsing signal, while the interconnecting node has no signal. The four load gates are all on different ICs. Which instrument will best help isolate the problem?

Q. 369) The binary numbers A = 1100 and B = 1001 are applied to the inputs of a comparator. What are the output levels?

Q. 370) A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?