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201. |
How many select lines are required for a 1- to-8 demultiplexer? |
A. | 2 |
B. | 3 |
C. | 4 |
D. | 5 |
Answer» B. 3 |
202. |
How many AND gates are required for a 1- to-8 multiplexer? |
A. | 2 |
B. | 6 |
C. | 8 |
D. | 5 |
Answer» C. 8 |
203. |
Which IC is used for the implementation of 1-to-16 DEMUX? |
A. | ic 74154 |
B. | ic 74155 |
C. | ic 74139 |
D. | ic 74138 |
Answer» A. ic 74154 |
204. |
All the comparisons made by comparator is done using |
A. | 1 circuit |
B. | 2 circuits |
C. | 3 circuits |
D. | 4 circuits |
Answer» A. 1 circuit |
205. |
One that is not the outcome of magnitude comparator is |
A. | a > b |
B. | a – b |
C. | a < b |
D. | a = b |
Answer» B. a – b |
206. |
If two numbers are not equal then binary variable will be |
A. | 0 |
B. | 1 |
C. | a |
D. | b |
Answer» A. 0 |
207. |
How many inputs are required for a digital comparator? |
A. | 1 |
B. | 2 |
C. | 3 |
D. | 4 |
Answer» B. 2 |
208. |
In a comparator, if we get input as A>B then the output will be |
A. | 1 |
B. | 0 |
C. | a |
D. | b |
Answer» A. 1 |
209. |
Comparators are used in |
A. | memory |
B. | cpu |
C. | motherboard |
D. | hard drive |
Answer» B. cpu |
210. |
A circuit that compares two numbers and determine their magnitude is called |
A. | height comparator |
B. | size comparator |
C. | comparator |
D. | magnitude comparator |
Answer» D. magnitude comparator |
211. |
A procedure that specifies finite set of steps is called |
A. | algorithm |
B. | flow chart |
C. | chart |
D. | venn diagram |
Answer» A. algorithm |
212. |
How many types of digital comparators are? |
A. | 1 |
B. | 2 |
C. | 3 |
D. | 4 |
Answer» B. 2 |
213. |
An identify comparator is defined as a digital comparator which has |
A. | only one output terminal |
B. | two output terminals |
C. | three output terminals |
D. | no output terminal |
Answer» A. only one output terminal |
214. |
A magnitude comparator is defined as a digital comparator which has |
A. | only one output terminal |
B. | two output terminals |
C. | three output terminals |
D. | no output terminal |
Answer» C. three output terminals |
215. |
The purpose of a Digital Comparator is |
A. | to convert analog input into digital |
B. | to create different outputs |
C. | to add a set of different numbers |
D. | to compare a set of variables or unknown numbers |
Answer» D. to compare a set of variables or unknown numbers |
216. |
TTL 74LS85 is a |
A. | 1-bit digital comparator |
B. | 4-bit magnitude comparator |
C. | 8-bit magnitude comparator |
D. | 8-bit word comparator |
Answer» B. 4-bit magnitude comparator |
217. |
4 to 1 MUX would have |
A. | 2 inputs |
B. | 3 inputs |
C. | 4 inputs |
D. | 5 inputs |
Answer» C. 4 inputs |
218. |
A combinational circuit that selects one from many inputs are |
A. | encoder |
B. | decoder |
C. | demultiplexer |
D. | multiplexer |
Answer» D. multiplexer |
219. |
4 to 1 MUX would have |
A. | 1 output |
B. | 2 outputs |
C. | 3 outputs |
D. | 4 outputs |
Answer» A. 1 output |
220. |
Which of the following circuit can be used as parallel to serial converter? |
A. | multiplexer |
B. | demultiplexer |
C. | decoder |
D. | digital counter |
Answer» A. multiplexer |
221. |
The inputs/outputs of an analog multiplexer/demultiplexer are |
A. | bidirectional |
B. | unidirectional |
C. | even parity |
D. | binary-coded decimal |
Answer» A. bidirectional |
222. |
If enable input is high then the multiplexer is |
A. | enable |
B. | disable |
C. | saturation |
D. | high impedance |
Answer» B. disable |
223. |
What is data routing in a multiplexer? |
A. | it spreads the information to the control unit |
B. | it can be used to route data from one of several source to destination |
C. | it is an application of multiplexer |
D. | both it can be used to route data and it is an application of multiplexer |
Answer» D. both it can be used to route data and it is an application of multiplexer |
224. |
How many inputs will a decimal-to-BCD encoder have? |
A. | 4 |
B. | 8 |
C. | 10 |
D. | 16 |
Answer» C. 10 |
225. |
How many outputs will a decimal-to-BCD encoder have? |
A. | 4 |
B. | 8 |
C. | 12 |
D. | 16 |
Answer» A. 4 |
226. |
How is an encoder different from a decoder? |
A. | the output of an encoder is a binary code for 1-of-n input |
B. | the output of a decoder is a binary code for 1-of-n input |
C. | the output of an encoder is a binary code for n-of-1 output |
D. | the output of a decoder is a binary code for n-of-1 output |
Answer» A. the output of an encoder is a binary code for 1-of-n input |
227. |
If we record any music in any recorder, such types of process is called |
A. | multiplexing |
B. | encoding |
C. | decoding |
D. | demultiplexing |
Answer» B. encoding |
228. |
Can an encoder be a transducer? |
A. | yes |
B. | no |
C. | may or may not be |
D. | both are not even related slightly |
Answer» A. yes |
229. |
How many OR gates are required for a Decimal-to-bcd encoder? |
A. | 2 |
B. | 10 |
C. | 3 |
D. | 4 |
Answer» D. 4 |
230. |
How many OR gates are required for an octal-to-binary encoder? |
A. | 3 |
B. | 2 |
C. | 8 |
D. | 10 |
Answer» A. 3 |
231. |
Can an encoder be called as multiplexer? |
A. | no |
B. | yes |
C. | sometimes |
D. | never |
Answer» B. yes |
232. |
If two inputs are active on a priority encoder, which will be coded on the output? |
A. | the higher value |
B. | the lower value |
C. | neither of the inputs |
D. | both of the inputs |
Answer» A. the higher value |
233. |
Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature? |
A. | low input voltages |
B. | synchronous operation |
C. | gate impedance |
D. | cross coupling |
Answer» D. cross coupling |
234. |
One example of the use of an S-R flip-flop is as |
A. | transition pulse generator |
B. | racer |
C. | switch debouncer |
D. | astable oscillator |
Answer» C. switch debouncer |
235. |
The truth table for an S-R flip-flop has how many VALID entries? |
A. | 1 |
B. | 2 |
C. | 3 |
D. | 4 |
Answer» C. 3 |
236. |
When both inputs of a J-K flip-flop cycle, the output will |
A. | be invalid |
B. | change |
C. | not change |
D. | toggle |
Answer» C. not change |
237. |
Which of the following is correct for a gated D-type flip-flop? |
A. | the q output is either set or reset as soon as the d input goes high or low |
B. | the output complement follows the input when enabled |
C. | only one of the inputs can be high at a time |
D. | the output toggles if one of the inputs is held high |
Answer» A. the q output is either set or reset as soon as the d input goes high or low |
238. |
A basic S-R flip-flop can be constructed by cross-coupling of which basic logic gates? |
A. | and or or gates |
B. | xor or xnor gates |
C. | nor or nand gates |
D. | and or nor gates |
Answer» C. nor or nand gates |
239. |
The logic circuits whose outputs at any instant of time depends only on the present input but also on the past outputs are called |
A. | combinational circuits |
B. | sequential circuits |
C. | latches |
D. | flip-flops |
Answer» B. sequential circuits |
240. |
Whose operations are more faster among the following? |
A. | combinational circuits |
B. | sequential circuits |
C. | latches |
D. | flip-flops |
Answer» A. combinational circuits |
241. |
How many types of sequential circuits are? |
A. | 2 |
B. | 3 |
C. | 4 |
D. | 5 |
Answer» A. 2 |
242. |
The sequential circuit is also called |
A. | flip-flop |
B. | latch |
C. | strobe |
D. | adder |
Answer» B. latch |
243. |
The basic latch consists of |
A. | two inverters |
B. | two comparators |
C. | two amplifiers |
D. | two adders |
Answer» A. two inverters |
244. |
In S-R flip-flop, if Q = 0 the output is said to be |
A. | set |
B. | reset |
C. | previous state |
D. | current state |
Answer» B. reset |
245. |
The output of latches will remain in set/reset untill |
A. | the trigger pulse is given to change the state |
B. | any pulse given to go into previous state |
C. | they don’t get any pulse more |
D. | the pulse is edge-triggered |
Answer» A. the trigger pulse is given to change the state |
246. |
What is a trigger pulse? |
A. | a pulse that starts a cycle of operation |
B. | a pulse that reverses the cycle of operation |
C. | a pulse that prevents a cycle of operation |
D. | a pulse that enhances a cycle of operation |
Answer» A. a pulse that starts a cycle of operation |
247. |
The circuits of NOR based S-R latch classified as asynchronous sequential circuits, why? |
A. | because of inverted outputs |
B. | because of triggering functionality |
C. | because of cross-coupled connection |
D. | because of inverted outputs & triggering functionality |
Answer» C. because of cross-coupled connection |
248. |
Which are easier to design? |
A. | clocked circuits |
B. | asynchronous sequential circuits |
C. | clocked circuits with buffer |
D. | asynchronous sequential circuits with buffers |
Answer» A. clocked circuits |
249. |
is used to drive high capacitance load. |
A. | single polar capability |
B. | bipolar capability |
C. | tripolar capability |
D. | bi and tri polar capability |
Answer» B. bipolar capability |
250. |
As the temperature is increased, storage time |
A. | halved |
B. | doubled |
C. | does not change |
D. | tripled |
Answer» A. halved |
251. |
Non inverting dynamic register storage cell consists of transistors for nMOS and for CMOS. |
A. | six, eight |
B. | eight, six |
C. | five, six |
D. | six, five |
Answer» A. six, eight |
252. |
Register cell consists of |
A. | inverter |
B. | pass transistor |
C. | inverter & pass transistor |
D. | none of the mentioned |
Answer» C. inverter & pass transistor |
253. |
In a four bit dynamic shift register basic nMOS transistor or inverters are connected in |
A. | series |
B. | cascade |
C. | parallel |
D. | series and parallel |
Answer» B. cascade |
254. |
In four bit dynamic shift register output is obtained |
A. | parallel output at inverters 1, 3, 5, 7 |
B. | parallel output at inverters 1, 5, 8 |
C. | parallel output at all inverters |
D. | parallel output at inverter 2, 4, 6, 8 |
Answer» D. parallel output at inverter 2, 4, 6, 8 |
255. |
Output values of Moore type FSM are determined by its |
A. | input values |
B. | output values |
C. | clock input |
D. | current state |
Answer» D. current state |
256. |
Moore machine output is synchronous. |
A. | true |
B. | false |
Answer» A. true |
257. |
Finite state machines are combinational logic systems. |
A. | true |
B. | false |
Answer» B. false |
258. |
What happens if the input is high in FSM? |
A. | change of state |
B. | no transition in state |
C. | remains in a single state |
D. | invalid state |
Answer» A. change of state |
259. |
What happens if the input is low in FSM? |
A. | change of state |
B. | no transition in state |
C. | remains in a single state |
D. | invalid state |
Answer» B. no transition in state |
260. |
In FSM diagram what does circle represent? |
A. | change of state |
B. | state |
C. | output value |
D. | initial state |
Answer» B. state |
261. |
In the FSM diagram, what does arrow between the circles represent? |
A. | change of state |
B. | state |
C. | output value |
D. | initial state |
Answer» A. change of state |
262. |
In the FSM diagram, what does the information below the line in the circle represent? |
A. | change of state |
B. | state |
C. | output value |
D. | initial state |
Answer» C. output value |
263. |
Moore machine has states than a mealy machine. |
A. | fewer |
B. | more |
C. | equal |
D. | negligible |
Answer» B. more |
264. |
State transition happens in every clock cycle. |
A. | once |
B. | twice |
C. | thrice |
D. | four times |
Answer» A. once |
265. |
In digital logic, a counter is a device which |
A. | counts the number of outputs |
B. | stores the number of times a particular event or process has occurred |
C. | stores the number of times a clock pulse rises and falls |
D. | counts the number of inputs |
Answer» B. stores the number of times a particular event or process has occurred |
266. |
A counter circuit is usually constructed of |
A. | a number of latches connected in cascade form |
B. | a number of nand gates connected in cascade form |
C. | a number of flip-flops connected in cascade |
D. | a number of nor gates connected in cascade form |
Answer» C. a number of flip-flops connected in cascade |
267. |
A decimal counter has states. |
A. | 5 |
B. | 10 |
C. | 15 |
D. | 20 |
Answer» B. 10 |
268. |
What is the maximum possible range of bit-count specifically in n-bit binary counter consisting of ‘n’ number of flip-flops? |
A. | 0 to 2n |
B. | 0 to 2n + 1 |
C. | 0 to 2n – 1 |
D. | 0 to 2n+1/2 |
Answer» C. 0 to 2n – 1 |
269. |
How many types of the counter are there? |
A. | 2 |
B. | 3 |
C. | 4 |
D. | 5 |
Answer» B. 3 |
270. |
Three decade counter would have |
A. | 2 bcd counters |
B. | 3 bcd counters |
C. | 4 bcd counters |
D. | 5 bcd counters |
Answer» B. 3 bcd counters |
271. |
BCD counter is also known as |
A. | parallel counter |
B. | decade counter |
C. | synchronous counter |
D. | vlsi counter |
Answer» B. decade counter |
272. |
The parallel outputs of a counter circuit represent the |
A. | parallel data word |
B. | clock frequency |
C. | counter modulus |
D. | clock count |
Answer» D. clock count |
273. |
Ring shift and Johnson counters are |
A. | synchronous counters |
B. | asynchronous counters |
C. | true binary counters |
D. | synchronous and true binary counters |
Answer» A. synchronous counters |
274. |
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 |
Answer» B. the direction of the shift |
275. |
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 |
Answer» C. a buffer that can operate in both directions |
276. |
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 |
Answer» D. all of the mentioned |
277. |
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 |
Answer» B. to provide an output that is equal to its input |
278. |
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 |
Answer» D. a single 1, the rest 0 |
279. |
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 |
Answer» B. transceiver |
280. |
The full form of SIPO is |
A. | serial-in parallel-out |
B. | parallel-in serial-out |
C. | serial-in serial-out |
D. | serial-in peripheral-out |
Answer» A. serial-in parallel-out |
281. |
A shift register that will accept a parallel input or a bidirectional serial load and internal shift features is called as? |
A. | tristate |
B. | end around |
C. | universal |
D. | conversion |
Answer» C. universal |
282. |
How can parallel data be taken out of a shift register simultaneously? |
A. | use the q output of the first ff |
B. | use the q output of the last ff |
C. | tie all of the q outputs together |
D. | use the q output of each ff |
Answer» D. use the q output of each ff |
283. |
What is meant by parallel load of a shift register? |
A. | all ffs are preset with data |
B. | each ff is loaded with data, one at a time |
C. | parallel shifting of data |
D. | all ffs are set with data |
Answer» A. all ffs are preset with data |
284. |
The group of bits 11001 is serially shifted (right-most bit first) into a 5-bit parallel output shift register with an initial state 01110. After three clock pulses, the register contains |
A. | 01110 |
B. | 00001 |
C. | 00101 |
D. | 00110 |
Answer» C. 00101 |
285. |
Assume that a 4-bit serial in/serial out shift register is initially clear. We wish to store the nibble 1100. What will be the 4-bit pattern after the second clock pulse? (Right-most bit first) |
A. | 1100 |
B. | 0011 |
C. | 0000 |
D. | 1111 |
Answer» C. 0000 |
286. |
A serial in/parallel out, 4-bit shift register initially contains all 1s. The data nibble 0111 is waiting to enter. After four clock pulses, the register contains |
A. | 0000 |
B. | 1111 |
C. | 0111 |
D. | 1000 |
Answer» C. 0111 |
287. |
With a 200 kHz clock frequency, eight bits can be serially entered into a shift register in |
A. | 4 μs |
B. | 40 μs |
C. | 400 μs |
D. | 40 ms |
Answer» B. 40 μs |
288. |
An 8-bit serial in/serial out shift register is used with a clock frequency of 2 MHz to achieve a time delay (td) of |
A. | 16 us |
B. | 8 us |
C. | 4 us |
D. | 2 us |
Answer» C. 4 us |
289. |
A sequence of equally spaced timing pulses may be easily generated by which type of counter circuit? |
A. | ring shift |
B. | clock |
C. | johnson |
D. | binary |
Answer» A. ring shift |
290. |
A bidirectional 4-bit shift register is storing the nibble 1101. Its input is HIGH. The nibble 1011 is waiting to be entered on the serial data-input line. After three clock pulses, the shift register is storing |
A. | 1101 |
B. | 0111 |
C. | 0001 |
D. | 1110 |
Answer» B. 0111 |
291. |
How many clock pulses will be required to completely load serially a 5-bit shift register? |
A. | 2 |
B. | 3 |
C. | 4 |
D. | 5 |
Answer» D. 5 |
292. |
How is an strobe signal used when serially loading a shift register? |
A. | to turn the register on and off |
B. | to control the number of clocks |
C. | to determine which output qs are used |
D. | to determine the ffs that will be used |
Answer» B. to control the number of clocks |
293. |
An 8-bit serial in/serial out shift register is used with a clock frequency of 150 kHz. What is the time delay between the serial input and the Q3 output? |
A. | 1.67 s |
B. | 26.67 s |
C. | 26.7 ms |
D. | 267 ms |
Answer» B. 26.67 s |
294. |
What are the three output conditions of a three-state buffer? |
A. | high, low, float |
B. | high-z, 0, float |
C. | negative, positive, 0 |
D. | 1, low-z, float |
Answer» A. high, low, float |
295. |
The primary purpose of a three-state buffer is usually |
A. | to provide isolation between the input device and the data bus |
B. | to provide the sink or source current required by any device connected to its output without loading down the output device |
C. | temporary data storage |
D. | to control data flow |
Answer» A. to provide isolation between the input device and the data bus |
296. |
What is the difference between a ring shift counter and a Johnson shift counter? |
A. | there is no difference |
B. | a ring is faster |
C. | the feedback is reversed |
D. | the johnson is faster |
Answer» C. the feedback is reversed |
297. |
A latch is an example of a |
A. | monostable multivibrator |
B. | astable multivibrator |
C. | bistable multivibrator |
D. | 555 timer |
Answer» C. bistable multivibrator |
298. |
Latch is a device with |
A. | one stable state |
B. | two stable state |
C. | three stable state |
D. | infinite stable states |
Answer» B. two stable state |
299. |
Why latches are called a memory devices? |
A. | it has capability to stare 8 bits of data |
B. | it has internal memory of 4 bit |
C. | it can store one bit of data |
D. | it can store infinite amount of data |
Answer» C. it can store one bit of data |
300. |
Two stable states of latches are |
A. | astable & monostable |
B. | low input & high output |
C. | high output & low output |
D. | low output & high input |
Answer» C. high output & low output |
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