Programmable Logic Device MCQs

Question 1

How many flip-flops are required to make a MOD-32 binary counter?

Accepted Answer

5

Answer

3

Answer

45

Answer

6

Question 2

Using four cascaded counters with a total of 16 bits, how many states must be deleted to achieve a modulus of 50,000?

Accepted Answer

15,536

Answer

50,000

Answer

65,536

Answer

25,536

Question 3

A MOD-16 ripple counter is holding the count 10012. What will the count be after 31 clock pulses?

Accepted Answer

10002

Answer

10102

Answer

10112

Answer

11012

Question 4

The terminal count of a modulus-11 binary counter is ________.

Accepted Answer

1010

Answer

1000

Answer

1001

Answer

1100

Question 5

List which pins need to be connected together on a 7493 to make a MOD-12 counter.

Accepted Answer

12 to 1, 11 to 3, 8 to 2

Answer

12 to 1, 11 to 3, 9 to 2

Answer

12 to 1, 11 to 3, 12 to 2

Answer

12 to 1, 11 to 3, 1 to 2

Question 6

How can a digital one-shot be implemented using HDL?

Accepted Answer

By applying the concept of a counter

Answer

By using a resistor and a capacitor

Answer

By using a library function

Answer

By applying a level trigger

Question 7

Integrated-circuit counter chips are used in numerous applications including:

Accepted Answer

timing operations, counting operations, sequencing, and frequency division

Answer

timing operations, counting operations, sequencing, and frequency multiplication

Answer

timing operations, decoding operations, sequencing, and frequency multiplication

Answer

data generation, counting operations, sequencing, and frequency multiplication

Question 8

Synchronous counters eliminate the delay problems encountered with asynchronous counters because the:

Accepted Answer

input clock pulses are applied simultaneously to each stage

Answer

input clock pulses are applied only to the first and last stages

Answer

input clock pulses are applied only to the last stage

Answer

input clock pulses are not used to activate any of the counter stages

Question 9

What is the difference between a 7490 and a 7492?

Accepted Answer

7490 is a MOD-10, 7492 is a MOD-12

Answer

7490 is a MOD-12, 7492 is a MOD-10

Answer

7490 is a MOD-12, 7492 is a MOD-16

Answer

7490 is a MOD-16, 7492 is a MOD-10