1. What is the difference between a ring shift counter and a Johnson shift counter ?

There is no difference

A ring is fast

The feedback is reversed

The Johnson is faster

Answer: The feedback is reversed

Explanation:


2. What type of register would have a complete binary number shifted in one bit at a time and have all the stored bits shifted out one at a time ?

parallel-in, parallel-out

parallel-in, serial-out

serial-in, parallel-out

serial-in, serial-out

Answer: serial-in, parallel-out

Explanation:


3. What is the function of a buffer circuit ?

to provide an output that is inverted from that on the input

to provide an output that is equal to its input

to clean up the input

to clean up the output

Answer: to provide an output that is equal to its input

Explanation:


4. Which type of device may be used to interface a parallel data format with external equipment's serial format ?

key matrix

UART

memory chip

series in, parallel out

Answer: UART

Explanation:


5. What is the preset condition for a ring shift counter ?

all FFs set to 1

all FFs cleared to 0

a single 0, the rest 1

a single 1, the rest 0

Answer: a single 1, the rest 0

Explanation:


6. When the output of a tristate shift register is disabled, the output level is placed in a: ?

float state

LOW state

high-impedance state

float or high-impedance state

Answer: float or high-impedance state

Explanation:


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

1010

1000

1001

none

Answer: 1010

Explanation:


8. A MOD-12 and a MOD-10 counter are cascaded. Determine the output frequency if the input clock frequency is 60 MHz ?

500 kHz

1,500 kHz

6 MHz

5 MHz

Answer: 500 kHz

Explanation:


9. Which segments of a seven-segment display would be required to be active to display the decimal digit 2 ?

a, b, d, e, and g

a, b, c, d, and g

a, c, d, f, and g

a, b, c, d, e, and f

Answer: a, b, d, e, and g

Explanation:


10. Which of the following is an invalid output state for an 8421 BCD counter ?

1110

0000

0010

0001

Answer: 1110

Explanation: