# Counter ICs MCQ’s

This set of Digital Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Counter ICs”.

1. How many different states does a 2-bit asynchronous counter have?
a) 1
b) 4
c) 2
d) 8

2. A 12 MHz clock frequency is applied to a cascaded counter containing a modulus-5 counter, a modulus-8 counter, and a modulus-10 counter. The lowest output frequency possible is ________
a) 10 kHz
b) 20 kHz
c) 30 kHz
d) 60 kHz

3. What is the difference between a 7490 and a 7493?
a) 7490 is a MOD-10, 7493 is a MOD-16
b) 7490 is a MOD-16, 7493 is a MOD-10
c) 7490 is a MOD-12, 7493 is a MOD-16
d) 7490 is a MOD-10, 7493 is a MOD-12

4. Which one is a 4-bit binary ripple counter?
a) IC 7493
b) IC 7490
c) IC 7491
d) IC 7492

5. A reset input is used in IC 7493, why?
a) For increment of bit by 1
b) For decrement of bit by 1
c) For reset the counter
d) For setting the counter

6. Which of the following is a decade counter?
a) IC 7493
b) IC 7490
c) IC 7491
d) IC 7492

7. IC 7493 consist of ____________
a) 4 S-R flip-flop
b) 4 J-K flip-flop
c) 4 master-slave flip-flop
d) 4 D flip-flop

8. In a 4-bit binary ripple counter, four master-slave flip-flops are internally connected to provide a ________ bit counter.
a) Divide-by-2 & divide-by-6
b) Divide-by-6 & divide-by-8
c) Divide-by-2 & divide-by-8
d) Divide-by-4 & divide-by-8

9. In a 4-bit decade counter, four master-slave flip-flops are internally connected to provide a ________ bit counter.
a) Divide-by-2 & divide-by-6
b) Divide-by-6 & divide-by-8
c) Divide-by-2 & divide-by-5
d) Divide-by-4 & divide-by-8

10. The set inputs are used in a decade counter, why?
a) To set the counter to 0011
b) To set the counter to 1000
c) To set the counter to 1001
d) To set the counter to 0001

11. Ripple counter IC has _____________
a) 10 pins
b) 11 pins
c) 12 pins
d) 14 pins

12. Reset inputs are used in IC 7490, why?
a) For increment of bit by 1
b) For decrement of bit by 1
c) For reset the counter
d) For setting the counter

13. List which pins need to be connected together on a 7493 to make a MOD-12 counter.
a) 12 to 1, 11 to 3, 9 to 2
b) 12 to 1, 11 to 3, 12 to 2
c) 12 to 1, 11 to 3, 8 to 2
d) 12 to 1, 11 to 3, 1 to 2

14. Integrated-circuit counter chips are used in numerous applications including ____________
a) Timing operations, counting operations, sequencing, and frequency multiplication
b) Timing operations, counting operations, sequencing, and frequency division
c) Timing operations, decoding operations, sequencing, and frequency multiplication
d) Data generation, counting operations, sequencing, and frequency multiplication

15. What is the difference between 7490 and a 7492?
a) 7490 is a MOD-12, 7492 is a MOD-10
b) 7490 is a MOD-12, 7492 is a MOD-16
c) 7490 is a MOD-16, 7492 is a MOD-10
d) 7490 is a MOD-10, 7492 is a MOD-12