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Shift Register Question & Answers

May 17, 2022 By WatElectronics

This article provides 100 multiple choice questions and answers on shift registers for engineering students. These MCQs are available with a hint and appropriate link where the user can get information on relevant topics. The following shift register MCQs are very helpful for beginners, students, and professionals for preparing the exams, quizzes, and interviews by knowing the basics of the shift register concept.

The set of flip-flops (FFs) which are used to store the binary data is called a register. A shift register is a digital circuit including a group of flip-flops where one flip flop output is connected to the next flip flop input. They share a single CLK signal to store the data within the system to move from one place to other.

There are five types of shift registers shift right, shift left, circular, bidirectional, and linear feedback. In shift registers, there are four modes of operation serial in serial out (SISO), serial in parallel out (SIPO), parallel in parallel out (PIPO) and parallel in serial out (PISO) shift registers.

The advantages of shift registers include; shift registers are very fast to use, simple design, data conversion is faster, used to encrypt/decrypt the data, track the data, etc. The main disadvantage of the shift register is; that the output current produced by this register is limited.

The applications of shift registers mainly include; these registers are used to store the data temporarily, transfer the data, used in calculators, computers, etc. By using these registers, adding binary inputs to the microprocessor as it includes a fixed number of input and output pins.

1). Which of the following mode is used as control inputs to a 4-bit universal shift register?
HintIt stores the data in parallel.
2). The number of flip-flops in a shift register is dependent upon?
HintIt depends on the state at the FF.
3). In which mode can we provide data to all the flip-flops simultaneously?
HintIn this mode, data communication can be done in between devices
4). A shift register is a digital circuit that _____________ .
HintData can move left ,right and stored.
5). What is a shift register?
HintThese circuits are used in computer, calculators, etc.
6). What type of register is a shift register?
HintShift register is a digital circuit build with Flip Flops.
7). A shift register is made up of how many flip-flops?
HintIt uses minimum three flip flops and above.
8). What happens when a shift register is clocked?
HintThe transmission of data can be done from one location to other.
9). A shift register can have __________ data input and __________ data output lines.
HintShift register can have single input and two outputs.
10). A shift register can be used as a ___________-bit register by connecting all the parallel outputs together and applying the same input to all the parallel inputs.
HintIt can be used as number of bit register.
11). Which among the following is the main advantage of using a shift register?
HintThese are applicable where number of I/O pins are used.
12). Which of the following type of shift register is used in 8085 microprocessor?
HintA SIPO shift register is used in 8085 microprocessor.
13). Which of the following is true about shift registers?
HintThese registers uses clk signals to transmit the data.
14). Which of the following is not a characteristic of universal shift registers?
HintThe operation of serial input serial output is not possible.
15). Which of the following shift registers can be used as both PISO and SIPO?
HintThe USR is used as SIPO & PISO.
16). What is the difference between a SISO, SIPO and PISO shift register?
HintThe common difference between these shift registers is data transmission.
17). What is one of the main functions of a shift register?
HintIt is used to convert the digital data.
18). Which of the following shift registers are also called universal shift registers?
HintThese registers have the capabilities of right shift and left shift.
19). A ________ is a group of special circuit with their outputs connected in series to form a register.
HintIt is a digital circuit which includes a set of flip flops.
20). What are the two basic types of shift registers?
HintThese are serial input & output and Parallel input and output.
21). A shift register is essentially a group of flip-flops, so what can they be used for?
HintThese registers are used for multiple purposes.
22). Which of the following statements about shift registers is true?
HintThese registers are also know as PISO.
23). Why would you use a shift register?
HintThe one FF output is connected to next FF input.
24). What types of functions can a shift register perform?
HintIt performs different operations like data transfer, storage, etc.
25). What is the difference between a serial and parallel shift register?
HintThe difference between these two registers is mainly data transmission.

Shift Register MCQs for Exams

26). Which of the following is correct about serial in/serial out shift register?
HintIt includes one input and one output.
27). Which type of shift register is used to implement a digital up-down counter?
HintIn this type of register, data loading occurs within serial-mode.
28). Shift register is a___?
HintThese circuits uses set of Flip Flops.
29). How many stages are in a 74LS170 parallel-out, serial-in shift register?
HintIt is organized 4 four words through four bits.
30). Which of the following is a serial-in, parallel-out shift register?
HintIt is a high speed 8-bit register.
31). Which of the following is a disadvantage of shift registers?
32). Which of the following is a advantage of shift registers?
HintThe time taken to access the data is high as compared to RAM unit.
33). The maximum clock frequency of the 74HC595 shift register is?
HintIt ranges from 60 to 110 MHz.
34). A shift register with a feedback function is useful in _______applications?
HintIt is used to make arithmetic operations.
35). Which of the following statements are TRUE regarding shift registers?
HintIn this digital circuit, the output of one FF is connected to next FF.
36). What is serial in parallel out (SIPO) shift register?
HintIt is similar to SISO shift register.
37). Which of these is not true about shift registers?
HintThey moves the data from one location to other.
38). Which of the following terms describes a shift register’s ability to cycle its data within itself, thus acting as memory?
Hint: By using this the first stage output is connected to next stage input.
39). Which of the following is a reason SIPO registers might be attached to the output of microprocessors?
HintOnce more general purpose input & output pins are necessary as compared to available ones.
40). What is a SIPO register?
HintIt is similar to serial input serial output register.
41). Shift registers can also be used as:
HintThey have longer outputs as compared to the input pulses.
42). Does a parallel-in serial-out (PISO) shift register configuration have the data input on lines D1 through D4 in parallel format, D1 being the ....bit?
HintIt is a highest digit bit.
43). To write the data to the register, what must the Write/Shift control line be held?
HintThe control line should be held not high.
44). What are the advantages of using a SIPO shift register?
HintIt uses serial input and generates parallel output.
45). Which of the following are true about a SIPO Shift Register?
HintIt performs all the operations.
46). In a Serial Input Serial Output, how is data is shifted?
HintOne bit can be shifted in any direction under CLK signal.
47). What is the first step in designing a serial-in/serial-out shift register?
HintIf we reset the flip flops, the errors will be cleared,
48). What is the difference between a series input (SI) and a parallel input (PI)?
HintThe main difference is the data loading.
49). How the data is stored in a SISO shift register?
HintThe data comes in in succession.
50). Which of the following digital circuit can store a bit of data and shift it left or right?
HintThese are used for data movement.

Shift Register MCQs for Interviews

51). Which of the following is used to create a circular buffer?
HintThese circuits share single clock signal.
52). Which of the following digital circuit is used to make a shift clock?.
HintThis circuit uses cascade of flip flops.
53). The most common type of shift register is?.
HintIt uses serial input and generates parallel output.
54). A shift counter can be created by using______?
HintIt is one type of digital circuit.
55). A shift register chain can be created by using______ .
HintIt is used in data processing systems.
56). Which of the following is used to create a shift register ladder?
HintIt is a type of digital circuit which uses flip flops.
57). A shift register is a______ .
58). A shift register can be used to _____ .
59). The most common type of shift register is the__________ .
HintIt is also known as SIPO register.
60). In a shift register, the output of each stage is the ?
HintIt is used as a feedback.
61). A shift register can be used to?
HintA shift register creates a delay within a digital signal.
62). What is the effect of a left shift operation on a binary number?
HintIt simply increases the number by two.
63). What is the purpose of a bidirectional shift register?
HintThe effect of a left shift operation is to multiply the number by two.
64). What is the effect of a right shift operation?
HintThe effect of a right shift operation is to separate the number by two.
65). What is a Ring counter?
HintOutput is fed to input to form a ring.
66). What is a Johnson counter?
HintIn this counter, the serial outputs are connected to serial inputs.
67). What is a ring counter?
HintThe output of the MS stage is given as feedback to the LS stage input.
68).What is the main advantage of a ring counter over a binary counter?
HintIt doesn’t require a decoder.
69). Johnson counter is an example of which type of sequential circuit:
HintThe output of this circuit changes simply at some discrete moments of time.
70). Which of the following counters is known as 2-bit Johnson Counter?
HintThis mode uses four clock pulses to obtain from 00 to 11.
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