MCQOPTIONS
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MCQOPTIONS
This section includes 2171 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
A decade counter skips |
| A. | binary states 1000 to 1111 |
| B. | binary states 0000 to 0011 |
| C. | binary states 1010 to 1111 |
| D. | binary states 1111 to higher |
| Answer» D. binary states 1111 to higher | |
| 302. |
Octal number 12 is equal to decimal number |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 11 |
| Answer» D. 11 | |
| 303. |
Which memory is available in all technologies? |
| A. | PROM |
| B. | EEPROM |
| C. | ROM |
| D. | EPROM |
| Answer» B. EEPROM | |
| 304. |
Among the digital IC families - ECL, TTL, and CMOS |
| A. | ECL has the least propagation delay |
| B. | TTL has largest fan out |
| C. | CMOS has the lowest noise margin |
| D. | TTL has the lowest power consumption |
| Answer» B. TTL has largest fan out | |
| 305. |
Which of these are two state devices? |
| A. | Lamp |
| B. | Punched card |
| C. | Magnetic tape |
| D. | All of the above |
| Answer» E. | |
| 306. |
The main drawbacks of EEPROM are |
| A. | low density |
| B. | high cost |
| C. | both low density and high cost |
| D. | none of the above |
| Answer» D. none of the above | |
| 307. |
Time delay of a TTL standard family is about |
| A. | 180 ns |
| B. | 50 ns |
| C. | 18 ns |
| D. | 3 ns |
| Answer» D. 3 ns | |
| 308. |
In 8085 microprocessor, what is the length of SP (stack) pointer? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» E. | |
| 309. |
A semiconductor Read-only-Memory basically is |
| A. | a combinational logic circuit |
| B. | a set of flip-flop memory elements |
| C. | a sequential circuit with flip-flops and gates |
| D. | none of the above |
| Answer» B. a set of flip-flop memory elements | |
| 310. |
Number of cards read per minute by a card reader may be of the order of |
| A. | 20 |
| B. | 1 |
| C. | 10000 |
| D. | 300 |
| Answer» E. | |
| 311. |
A Karnaugh map with 4 variables has |
| A. | 2 cells |
| B. | 4 cells |
| C. | 8 cells |
| D. | 16 cells |
| Answer» E. | |
| 312. |
Fundamental mode is another name for |
| A. | level operation |
| B. | pulse operation |
| C. | clock operation |
| D. | none of these |
| Answer» C. clock operation | |
| 313. |
Is Schottky TTL, Schottky diode is used primary to |
| A. | prevent saturation of the transistor |
| B. | saturate the transistor |
| C. | act as a switch |
| D. | act as a controlling switch |
| Answer» B. saturate the transistor | |
| 314. |
The first contribution to logic was made by |
| A. | George Boole |
| B. | Copernicus |
| C. | Aristotle |
| D. | Shannon |
| Answer» D. Shannon | |
| 315. |
VF glows with __________ colour when activated. |
| A. | Red |
| B. | Orange |
| C. | Bluish green |
| D. | none of these |
| Answer» D. none of these | |
| 316. |
The number of select lines in a 16 : 1 multiplexer are |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» B. 3 | |
| 317. |
While obtaining minimal SOP expression |
| A. | all do not care terms are ignored |
| B. | all do not care terms are treated as 1 |
| C. | all do not care terms are treated as 0 |
| D. | only such do not care terms which aid minimization are treated as 1 |
| Answer» E. | |
| 318. |
Average latency time of magnetic tape memory is of the order of |
| A. | 1 μ sec |
| B. | 1 msec |
| C. | 1 sec |
| D. | 1 minute |
| Answer» E. | |
| 319. |
A shift register can be used for all of the following EXCEPT |
| A. | ring counter |
| B. | A/D conversion |
| C. | series to parallel conversion |
| D. | generation of delay |
| Answer» C. series to parallel conversion | |
| 320. |
Minimum no. of 2 I/P NAND gate required to implement the Boolean function Z = ABC, assuming that A, B and C are available is |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 321. |
The number of programmable 16 bit registers of 6800 are |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 322. |
If the inputs to a 2 input XOR gate are high then, the output is high. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 323. |
Decimal 8 in excess-3 code = |
| A. | 1000 |
| B. | 1001 |
| C. | 1011 |
| D. | 1111 |
| Answer» D. 1111 | |
| 324. |
In the switching circuit, switches A, B have value 0 for OFF, 1 for ON and the output Y has 0 volts for 1 volts, then the expression for Y is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 325. |
A 1 ms pulse can be converted into a 10 ms pulse by using which one of the following |
| A. | An astable multivibrator |
| B. | Stable multivibrator |
| C. | A bistable multivibrator |
| D. | A J-K flip-flop |
| Answer» C. A bistable multivibrator | |
| 326. |
ALU carries out |
| A. | arithmetic operations |
| B. | logic operations |
| C. | both arithmetic and logic operations |
| D. | none of the above |
| Answer» D. none of the above | |
| 327. |
What will be BCD number when the output is 0.37 V? |
| A. | 00110111 |
| B. | 10110111 |
| C. | 11001000 |
| D. | 01001000 |
| Answer» B. 10110111 | |
| 328. |
In 8355, the ROM is organized as __________ words of 8 bits each. |
| A. | 2000 |
| B. | 2048 |
| C. | 8355 |
| D. | 835 |
| Answer» C. 8355 | |
| 329. |
The problem of logic race occurs in |
| A. | SOP functions |
| B. | POS functions |
| C. | Hybrid function |
| D. | SOP and POS functions |
| Answer» D. SOP and POS functions | |
| 330. |
A 4 bit transistor register has output voltage of high-low-high-low. The binary number stored and its decimal equivalent are |
| A. | 0101 and 5 |
| B. | 0101 and 10 |
| C. | 1010 and 5 |
| D. | 1010 and 10 |
| Answer» E. | |
| 331. |
For NOR gate SR flip-flop, the 'no change' condition is |
| A. | S = 0, R = 0 |
| B. | S = 1, R = 0 |
| C. | S = 0, R = 1 |
| D. | S = 1, R = 1 |
| Answer» B. S = 1, R = 0 | |
| 332. |
The binary sum of 111010₂ and 11011₂ is |
| A. | 1010101₂ |
| B. | 1011001₂ |
| C. | 1011101₂ |
| D. | 1111111₂ |
| Answer» B. 1011001₂ | |
| 333. |
2's complement of binary number 0101 is |
| A. | 1011 |
| B. | 1111 |
| C. | 1101 |
| D. | 1110 |
| Answer» B. 1111 | |
| 334. |
A parity check usually can detect |
| A. | one-bit error |
| B. | double-bit error |
| C. | three-bit error |
| D. | any-bit error |
| Answer» B. double-bit error | |
| 335. |
Assertion (A): An SR latch has the problem of RAC conditionReason (R): While designing a digital circuit RAC condition should be avoided. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is true, R is false |
| D. | A is false, R is true |
| Answer» C. A is true, R is false | |
| 336. |
In the decimal number 27, the digital 2 represents |
| A. | 2 |
| B. | 20 |
| C. | 0.2 |
| D. | 200 |
| Answer» C. 0.2 | |
| 337. |
In 8085 microprocessor the value of the most significant bit of the result following the execution of any arithmetic or Boolean instruction is stored in |
| A. | the carry status flag |
| B. | the auxiliary carry status flag |
| C. | sign status flag |
| D. | zero status flag |
| Answer» D. zero status flag | |
| 338. |
In a 4 bit D/A converter, the offset error is the output voltage when input digital voltage is |
| A. | 1111 |
| B. | 0000 |
| C. | either 1111 or 0000 |
| D. | none of the above |
| Answer» C. either 1111 or 0000 | |
| 339. |
In a ripple counter, |
| A. | whenever a flip flop sets to 1, the next higher FF toggles |
| B. | whenever a flip flop sets to 0, the next higher FF remains unchanged |
| C. | whenever a flip flop sets to 1, the next higher FF faces race condition |
| D. | whenever a flip flop sets to 0, the next higher FF faces race condition |
| Answer» B. whenever a flip flop sets to 0, the next higher FF remains unchanged | |
| 340. |
A/D parallel converter is also called flash converter. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 341. |
The resolution of an n bit DAC with a maximum input of 5 V is 5 mV. The value of n is |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 11 |
| Answer» D. 11 | |
| 342. |
For K map of the given figure the simplified Boolean expression is |
| A. | Y = A̅ B C̅ + A B̅ C̅ + A̅ B̅ C |
| B. | Y = A̅ C + B̅ |
| C. | Y = A̅ B̅ C̅ + ABC |
| D. | Y = A B̅ C + AB C̅ + ABC |
| Answer» C. Y = A̅ B̅ C̅ + ABC | |
| 343. |
Which device uses Pneumatic fluid? |
| A. | LED |
| B. | LCD |
| C. | VF display |
| D. | None of these |
| Answer» C. VF display | |
| 344. |
A̅ B̅ C̅ D̅ + (A̅B̅) C D̅ = |
| A. | ABC |
| B. | (A̅B̅C̅D̅) |
| C. | A̅ B̅ D̅ |
| D. | ABCD |
| Answer» D. ABCD | |
| 345. |
The contents of the program counter after the call operation will be |
| A. | (30F0)H |
| B. | (40F0)H |
| C. | (50F0)H |
| D. | (60F0)H |
| Answer» B. (40F0)H | |
| 346. |
What is the addressing mode used in instruction MOV M, C? |
| A. | Direct |
| B. | Indirect |
| C. | Induced |
| D. | Immediate |
| Answer» C. Induced | |
| 347. |
For the logic circuit shown in figure, the simplified Boolean expression for the output Y is |
| A. | A + B + C |
| B. | AB |
| C. | B |
| D. | C |
| Answer» C. B | |
| 348. |
Parallel adder is |
| A. | sequential circuit |
| B. | combinational circuit |
| C. | either sequential or combinational circuit |
| D. | none of the above |
| Answer» C. either sequential or combinational circuit | |
| 349. |
All digital circuits can be realised using only |
| A. | EX-OR gates |
| B. | Multiplexers |
| C. | Half adders |
| D. | OR gates |
| Answer» C. Half adders | |
| 350. |
Assertion (A): Tristate logic is used for bus oriented systems Reason (R): The outputs of a tristate logic are 0, 1 and indeterminant. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is true, R is false |
| D. | A is false, R is true |
| Answer» D. A is false, R is true | |