Asynchronous Counter Question & Answers May 3, 2022 By WatElectronics This article lists 75 Asynchronous Counter MCQs for engineering students. All the Asynchronous Counter Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on their fundamentals on Asynchronous Counter. Counters are defined as a number of events or processes that occurred in presence of clock timings. There exist two types of basic counters asynchronous counters and synchronous counters. Counters whose output is unoccupied by applying different clock signals are called Asynchronous counters. The number of logic gates required to design it is very less. The alternative name for asynchronous counters is Ripple counters. Flip flops used in asynchronous/ripple-counters depend upon a number of states of the counter and the output of its states is called Modulus or MOD of the counter. The highest number of states used by the counter is 2n, where n is represented by the number of flip flops used in the counter. Example: If we use 2 Flip flops, then the number of states at the output of the counter is 4. i.e, 2*2=4.It is also called Modulus-4 or MOD-4 Counter. There are many types of Asynchronous/ripple counters like Up counter, Down counter, Ripple Up/Down Counter, and Ripple BCD counter. Up counter: Ripple counter starts the count from 0 to maximum range n. n depends upon the number of FFs used. Ripple Up counter can be built using D and T flip flops. Design differs based on the type of Flip flops used in the circuit. Toggling will be the same in both D and T flip-flops. Down Counter: Ripple Down counter starts the count from the maximum possible range to 0 and resets back from the maximum count. The design is the same as the Up counter the only difference is toggling in D and T flip flops differs. The output of each flip flop will be given as input to succeeding flip flops. So that it activates the counter to count from backward. Up/Down Counter: This counter can do both Up and Down counting based on the type of mode select switch. When the mode switch is high, then the counter will count up whereas when the mode switch is low, then the counter will count down. Here we use 2*1 MUX to select two clock signals. Asynchronous BCD Counter: The Asynchronous BCD Counter is the same as the Asynchronous Up counter, when the count reaches the decade it resets to zero flip flops. 1). Counters defines the combination of ________ data. Digital Automated Cybernated Programmed Hint 2). How many types of counters exist? Three Four Five Two Hint 3). Other name for Asynchronous counters is _______counters. Ripple Up counters Down counters Modulus Hint 4). Asynchronous counters are_______ to design. Difficult Moderate Simple Tough Hint 5). Number of logic gates required to design asynchronous counters are? More Less Moderate None of the above Hint 6). Flip flops in Asynchronous/Ripple counters are supplied with ______ clock signals. Different Same Moderate None of the above Hint 7). Flip flops depends on number of ______? Values Digits States Signals Hint 8). The output states of ripple counter are called______ counter. Modulus Synchronous Asynchronous Server Hint 9). Modulus can also be written as ______ counter. MOD DOM COUNT MODBUS Hint 10). Maximum number of states available in counters are? n+1 n n-1 2n Hint 11). Number of flip flops used in the counter are represented by___? m n a b Hint 12) How many flip flops produce the output 4 at the counter. 1 2 3 4 Hint 13). Modulus-4 counter is represented as ______. MOD-4 DOM-4 DOL-4 COM-4 Hint 14). Which of the following are the types of Asynchronous counters available? Asynchronous 4-bit UP counter Asynchronous 4-bit DOWN counter Asynchronous 4-bit UP/DOWN counter All of the above Hint 15). Which of the following circuit is responsible for driving the counter circuit with delay _____? Propagation delay Ripple counter Modulus Clock ripple Hint 16). Asynchronous counters are designed with______ type of flip flops. T SR JK None of the above Hint 17). D-flip flops are used to design ______ counters. Asynchronous Decade Synchronous Decade Asynchronous Synchronous Hint Asynchronous Counter Quiz Questions and Answers. 18). Ripple counters are used in_____ circuits. Low speed High speed Moderate Least level Hint 19). Asynchronous counters are used as_______ counters. Divide by zero Divide by n Divide by 1 Divide by n+1 Hint 20). ________ counters are used to design any MOD number of counters. Truncated Clock ripple Delay Propagation Synchronous Hint 21). Counting error occurs due to ______ propagation delay. Small Medium Large Least Hint 22). Asynchronous counters are used in _____ counters. Asynchronous Decade Synchronous Decade Ring counters Synchronous counters Hint 23). Asynchronous counters are used in _____ quantity noise emission. High Low Medium Null Hint 24). Which of the following is the reason for requirement of more flip flops in Asynchronous counters for? Synchronization Re synchronization High propagation delay Clock ripple Hint 25). MOD 3, MOD 5, MOD 7 counters are all ______ type of counters. Even Multiple Odd Single Hint 26). Always propagation delays are represented by_____ lines. Black Brown Blue White Hint 27). Clock ripple is used as a_______ counter. Significant Insignificant Reliable Temporary Hint 28). Asynchronous/Ripple counters are also used in _____ applications. High power Low power Medium Short delay Hint 29). Ripple counters are also used to design _____ counters. Asynchronous Decade Synchronous Decade Ring counters Synchronous counters Hint Asynchronous Counter Interview Questions and Answers 30). Ripple counters are also used in ____ counters. Modulus Asynchronous Decade Ring counter Johnson counters Hint 31). Asynchronous counter can have _______ counting states. 2^n-1 2n 2n-1 2n+1 Hint 32). When Modulo-16 asynchronous counter is modified by decade then it is referred as____ counter. Decade Ripple Asynchronous Synchronous Hint 33). J-K flip flop multi-vibrators set up for the______ mode. 0 1 Toggle Infinity Hint 34). Four bit sequence toggles between 1 and _____. Infinity 1 2 0 Hint 35). Ripple effect is seen in______ circuits. Binary Adder Full adder Subtractor Binary Multiplier Hint 36).In ______ circuits common problem of ripple effect is also observed. Data transfer Data retrieving Data conversion None of the above Hint Read more aboutBinary Adder and Subtractor Circuits.. 37). The output bits will ripple in sequence from ____. LSB to MSB LSB to 0 LSB to 1 LSB to infinity Hint 38)._________ is a technique deployed to gain the output of an asynchronous/ripple counter. Ripple effect Strobing Triggering Counting Hint 39). Ripple counter circuit is_________ to design. Difficult Simple Tough None of the above Hint 40). Which of the following is the output frequency for 1-bit asynchronous/ripple counter will be__________? f f/2 f %2 1/2f Hint 41). Output frequency for 2-bit asynchronous/ripple counter will be_______? f/2 f /4 f 1/4f Hint 42). Put M=1 and M^'=0 in Y= M’Q + MQ’, then the output will be? Q 2Q^' Q^' 2/Q^' Hint 43). Asynchronous decade counter has _____ number of JK Flip-flops. 2 3 4 6 Hint 44). Decade counter has 4 JK flip flops and_____ number of logic gates. NAND AND OR NOT Hint 45). NAND gate in decade counter is represented as _____ IC? 74LS10D 74LS11D 74SL10D 74SL01D Hint 46). Decimal value of 1001 is___? 5 6 7 9 Hint 47). Binary number of decimal value 7 is______? 1000 0101 0110 0111 Hint 48). Decimal value of binary number 0011 is____? 1 2 3 4 Hint 49). Binary value of 6 is represented by______? 0011 0110 0101 0111 Hint 50). When decade counters output reaches to decimal value 9 then the counters are _____ to zero. Move Constant Reset Stop Hint 51). Abbreviation of BCD is____? Binary Coded Decimal Binary Counter decimal Bit Coded Decimal Binary Coded Decoder Hint 52). 3-bit flip flop arrangement counter can have___ falling edges. 7 8 9 6 Hint 53). Number of states depends on number of _____________ occupied in the circuit. Counters Timers Flip flops Decoders Hint 54). Designing of counters depends upon types of _______ component used. Counters Timers Flip flops Decoders Hint 55). Which of the following is the range of Asynchronous/Ripple counter, counting range? 1 to maximum range 2 to maximum range 0 to maximum range 3 to maximum range Hint Asynchronous Counter MCQs for Exams 56). Which of the following parameter is the major difference between Up and down counter flip flop? Toggling Increasing Decreasing Static Hint Read more about Digital Counter . 57). In up-counter, we use positive edge flip flops which are represented by____? 2Q ̅ Q ̅ Q ̅/2 Q ̅/4 Hint 58). In down counter we use Q as ______? Flip flop Counters States Clock signal Hint 59). Up/down counter works depending upon the _____ switch. Low High Select None of the above Hint 60). Up and down counters use _____ with clock signals. 1*3 MUX 2*1 MUX 1*2 MUX 1*1 MUX Hint 61). Asynchronous BCD counter is same as Ripple ____ counter. Up/Down Up Down Decade Hint 62). To count the truncated counters sequence, additional _____ logic is needed. Active Inactive Feedback None of the above Hint 63). For designing BCD counter ____ number of T-flip flops are required. 3 4 5 2 Hint 64). Delay of next flip flop is added to the sum of individual flip flops are known as _________. Ripple clock Propagation delay Ripple BCD Decade propagation Hint 65). The operation of Up/down counter is very ____ than up counter. Fast Immediate Static Slow Hint 66). Down counter is quick than _______ counter. Ripple counter BCD counter Clock ripple Up/Down counter Hint 67). Because of additional propagation delay added to _____ gate, up/down becomes slower. NOR AND OR NAND Hint 68). In clock ripple, at clock pulse 8 the output should change from 11102 to _____. 00012 00120 00002 00001 Hint 69). If present count=3, then the next count will be____ using down counter. 2 5 4 6 Hint 70). 4-bit down counter counts from_____. 15 to 1 0 to 15 2 to 15 15 to 33 Hint 71). If present count=3, then the next count will be____ using up counter. 2 5 4 6 Hint 72). In asynchronous 4-bit up counter with d- flip flop it counts from 0 to ___. 11 10 12 15 Hint 73). Asynchronous counter is also known as_____ counter. Parallel Serial Hybrid None of the above Hint 74). ____________ are produced in asynchronous counter. Decoding errors Encoding Difference Delays Hint 75).______________ is fixed in asynchronous counter. Count sequence Ripple clock Decade count Counting errors Hint For More MCQs Synchronous Counter Question & Answers Please fill in the comment box below. Time is Up! Time's up