# Digital Circuits Questions and Answers – Ring Counter

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

1. Ring shift and Johnson counters are ____________
a) Synchronous counters
b) Asynchronous counters
c) True binary counters
d) Synchronous and true binary counters

Explanation: Synchronous counters are the counters being triggered in the presence of a clock pulse. Since all of the clock inputs are connected through a single clock pulse in ring shift and johnson counters. So, both are synchronous counters.

2. What is the difference between a shift-right register and a shift-left register?
a) There is no difference
b) The direction of the shift
c) Propagation delay
d) The clock input

Explanation: In shift-right register, shifting of bit takes place towards the right and towards left for shift-left register. Thus, both the registers vary in the shifting of their direction.

3. What is a transceiver circuit?
a) A buffer that transfers data from input to output
b) A buffer that transfers data from output to input
c) A buffer that can operate in both directions
d) A buffer that can operate in one direction

Explanation: A transceiver circuit is a buffer that can operate in both directions right as well as left.

4. A 74HC195 4-bit parallel access shift register can be used for ____________
a) Serial in/serial out operation
b) Serial in/parallel out operation
c) Parallel in/serial out operation
d) All of the Mentioned

Explanation: 74HC195 is an IC, which can be used for all of the given operations, as well as for, parallel-in/parallel-out.

5. Which type of device may be used to interface a parallel data format with external equipment’s serial format?
a) UART
b) Key matrix
c) Memory chip
d) Series in Parallel out

Explanation: UART means Universal Asynchronous Receiver/Transmitter which converts the bytes it receives from the computer along parallel circuits into a single serial bit stream for outbound transmission. And also receives data in serial form and converts it into parallel form and sent to the processor.
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6. What is the function of a buffer circuit?
a) To provide an output that is inverted from that on the input
b) To provide an output that is equal to its input
c) To clean up the input
d) To clean up the output

Explanation: The function of a buffer circuit is to provide an output that is equal to its input. A transceiver circuit is a buffer that can operate in both directions right as well as left.

7. What is the preset condition for a ring shift counter?
a) All FFs set to 1
b) All FFs cleared to 0
c) A single 0, the rest 1
d) A single 1, the rest 0

Explanation: A ring shift counter is a counter in which the output of one FF connected to the input of the adjacent FF. In preset condition, all of the bits are 0 except first one.

8. Which is not characteristic of a shift register?
a) Serial in/parallel in
b) Serial in/parallel out
c) Parallel in/serial out
d) Parallel in/parallel out

Explanation: There is no such type of register present who doesn’t have output end. Thus, Serial in/Parallel in is not a characteristic of a shift register. There has to be an output, be it serial or parallel.

9. To keep output data accurate, 4-bit series-in, parallel-out shift registers employ a ____________
a) Divide-by-4 clock pulse
b) Sequence generator
c) Strobe line
d) Multiplexer

Explanation: In computer or memory technology, a strobe is a signal that is sent that validates data or other signals on adjacent parallel lines. Thus, in registers the strobe line is there to check the availability of data.

10. Another way to connect devices to a shared data bus is to use a ____________
a) Circulating gate
b) Transceiver
c) Bidirectional encoder
d) Strobed latch

Explanation: A transceiver is a device comprising both a transmitter and a receiver which are combined and share common circuitry or a single housing. When no circuitry is common between transmit and receive functions, the device is a transmitter-receiver.

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