

McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering , Bachelor of Science in Computer Science FY (BSc CS) , Bachelor of Computer Applications (BCA) , Bachelor of Science in Computer Science (BSc CS) .
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 |
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