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MCQOPTIONS
This section includes 1271 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
For wired AND connection we should use |
| A. | TTL gates with active pull up |
| B. | TTL gates with open collector |
| C. | TTL gates without active pull up and with open collector |
| D. | any of the above |
| Answer» D. any of the above | |
| 352. |
ABCD + AB C D = |
| A. | ABC |
| B. | ABCD |
| C. | A B D |
| D. | ABCD |
| Answer» D. ABCD | |
| 353. |
110.112 x 1102 = __________ 10 |
| A. | 40.5 |
| B. | 30.5 |
| C. | 20.5 |
| D. | 10.5 |
| Answer» B. 30.5 | |
| 354. |
A retriggerable one shot is one which |
| A. | can be triggered only once |
| B. | has two quasi stable states |
| C. | can not be retriggered till the complete pulse appears at output |
| D. | can be retriggered while the output is being generated |
| Answer» E. | |
| 355. |
Which of the following statements is not true in regard to storage time of a diode? |
| A. | During this time, the diode is reverse-biased |
| B. | The diode conducts during this time |
| C. | It is due to the time taken by carriers to depart from the function when the diode is reverse-biased |
| D. | During this time the diode current is zero |
| Answer» E. | |
| 356. |
Which of the following is decimal equivalent of the binary 1111111? |
| A. | 27 |
| B. | 87 |
| C. | 127 |
| D. | 167 |
| Answer» D. 167 | |
| 357. |
An 8 bit binary number is to be entered into an 8 bit serial shift register. The number of clock pulses required is |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» E. | |
| 358. |
Two 16 : 1 and one 2 : 1 multiplexers can be connected to form a |
| A. | 64 : 1 multiplexer |
| B. | 8 : 1 multiplexer |
| C. | 40 H |
| D. | 41 H |
| Answer» C. 40 H | |
| 359. |
What is the addressing mode used in instruction MOV M, C? |
| A. | Direct |
| B. | Indirect |
| C. | Induced |
| D. | Immediate |
| Answer» C. Induced | |
| 360. |
How many different binary numbers can be stored in a register consisting of six switches? |
| A. | 16 |
| B. | 32 |
| C. | 64 |
| D. | 128 |
| Answer» D. 128 | |
| 361. |
ADC 0804 is a |
| A. | successive approximation A/D converter |
| B. | either (a) or (b) |
| C. | 0.2 V |
| D. | 0.4 V |
| Answer» D. 0.4 V | |
| 362. |
To count 1000 bottles in a milk plant, the minimum number of flip flops requires is |
| A. | 12 |
| B. | 10 |
| C. | 8 |
| D. | 6 |
| Answer» C. 8 | |
| 363. |
In a three input AND gate A = 1, B = 1, C = 0 The output Y = |
| A. | ABC |
| B. | ABC |
| C. | ABC |
| D. | ABC |
| Answer» D. ABC | |
| 364. |
RS latch can be built with |
| A. | NOR gates |
| B. | NAND gates |
| C. | NOR or NAND gates |
| D. | none of the above |
| Answer» D. none of the above | |
| 365. |
Which of the following is not a characteristic of a flip flop? |
| A. | It is a bistable device |
| B. | It has two outputs |
| C. | It has two outputs are complement of each other |
| D. | It has one input terminal |
| Answer» E. | |
| 366. |
In 2's complement representation, a certain negative number - N is 1011. The representation for + N is |
| A. | 100 |
| B. | 101 |
| C. | 110 |
| D. | 11 |
| Answer» C. 110 | |
| 367. |
Some ADCs are ParallelUpdownSingle slopeDual slopeSuccessive approximationStair step Out of above which ones do not use DAC? |
| A. | 1 only |
| B. | 1, 3, 4 |
| C. | 1, 2, 3 |
| D. | 1, 5, 6 |
| Answer» C. 1, 2, 3 | |
| 368. |
In the 2's complement Adder-Subtractor |
| A. | sign magnitude numbers represent negative numbers |
| B. | the sign magnitude numbers have "1" as leading bit |
| C. | the sign magnitude numbers have '0' as leading bit |
| D. | 2's complement represents positive numbers |
| Answer» D. 2's complement represents positive numbers | |
| 369. |
Consider the following statements in connection with CMOS inverter in figure where both the MOSFET are of enhancement type and both have a threshold voltage of 2 Vstatements 1: T1 conducts when vi ‚â• 2 Vstatements 2: T1 is always in saturation when v0 = 0 VWhich of the following is correct? |
| A. | Only statement 1 is true |
| B. | Only statement 2 is true |
| C. | Both the statement are true |
| D. | Both the statements are false |
| Answer» B. Only statement 2 is true | |
| 370. |
In 8085 microprocessor, what are the contents of register SP, after the interrupt has been started? |
| A. | 0210 H |
| B. | 0211 H |
| C. | 054 CH |
| D. | 054 EH |
| Answer» D. 054 EH | |
| 371. |
The first machine cycle of an instruction is always |
| A. | a memory read cycle |
| B. | a fetch cycle |
| C. | a input/output read cycle |
| D. | a memory write cycle |
| Answer» C. a input/output read cycle | |
| 372. |
A device that converts from decimal to binary numbered is called |
| A. | decoder |
| B. | encoder |
| C. | CPU |
| D. | converter |
| Answer» C. CPU | |
| 373. |
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 | |
| 374. |
A quantization error is an essential aspect of ADC |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 375. |
In the given figure RC = RL = 1 kΩ, then V0 = |
| A. | 1 V |
| B. | 0 V |
| C. | 8 |
| D. | 6 |
| Answer» C. 8 | |
| 376. |
Which family of logic circuits uses field effect transistors? |
| A. | TTL |
| B. | CMOS |
| C. | Both LED and well as LCD |
| D. | None of the above |
| Answer» C. Both LED and well as LCD | |
| 377. |
The high voltage level of a digital signal in positive logic is |
| A. | either 1 or 0 |
| B. | -1 |
| C. | seven-segment display |
| D. | nickel tape |
| Answer» B. -1 | |
| 378. |
In 8085 microprocessor, how many I/O ports can be accessed by memory mapped method? |
| A. | 8 |
| B. | 256 |
| C. | 32 K |
| D. | 64 K |
| Answer» D. 64 K | |
| 379. |
A 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000). Then, what will be input, if the output register shows 100111 at the end of conversion. |
| A. | 5.85 V |
| B. | 6 V |
| C. | 5 V |
| D. | 10 V |
| Answer» B. 6 V | |
| 380. |
A twisted ring counter consisting of 4 FF will have |
| A. | 4 states |
| B. | 8 states |
| C. | 24 states |
| D. | None of the above |
| Answer» C. 24 states | |
| 381. |
The number of flip flops required to construct a register to store number 10210 in binary form is |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 10 |
| Answer» E. | |
| 382. |
A presettable counter with 4 flip flops can start counting from |
| A. | 0 |
| B. | 1000 |
| C. | any number from 0000 to 1000 |
| D. | any number from 0000 to 1111 |
| Answer» E. | |
| 383. |
In a sequential circuit the output at any instant depends on |
| A. | present inputs only |
| B. | past inputs only |
| C. | past outputs only |
| D. | past output and present input |
| Answer» E. | |
| 384. |
For the logic circuit of the given figure, the minimized expression is |
| A. | Y = A + B |
| B. | Y = ABC |
| C. | 1 |
| D. | |
| Answer» B. Y = ABC | |
| 385. |
A function table is required in very large numbers the memory most switched for this purpose would be |
| A. | EPROM |
| B. | EAROM |
| C. | Single pulse |
| D. | Square wave |
| Answer» B. EAROM | |
| 386. |
The number of comparator circuits required to build a three-bit simultaneous A/D converter is |
| A. | 15 |
| B. | 16 |
| C. | 10001000 |
| D. | 1000 |
| Answer» B. 16 | |
| 387. |
In 8156, the lower times byte is addressed with 24 H, and the upper times byte with |
| A. | 20 H |
| B. | 23 H |
| C. | 24 H |
| D. | 25 H |
| Answer» E. | |
| 388. |
Least expensive logic |
| A. | RTL |
| B. | DTL |
| C. | TTL |
| D. | ECL |
| Answer» B. DTL | |
| 389. |
In a four variable Karnaugh map, eight adjacent cells give a |
| A. | two variable term |
| B. | single variable term |
| C. | three variable term |
| D. | four variable term |
| Answer» C. three variable term | |
| 390. |
In Von-Neumann-or Princeton-type computers, the program |
| A. | can appear any where within the memory |
| B. | memory and data memory are clearly distinguished |
| C. | data and instructions are distinguished at the first stage |
| D. | none of the above |
| Answer» B. memory and data memory are clearly distinguished | |
| 391. |
AECF116 + 15ACD16 = __________ . |
| A. | C47BB16 |
| B. | C47BE16 |
| C. | A234F16 |
| D. | A111116 |
| Answer» C. A234F16 | |
| 392. |
How many JK flip-flops are needed to make a 4-bit shift register? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 393. |
Which of the following parameters is not specified for digital ICs? |
| A. | Gate dissipation |
| B. | Propagation delay |
| C. | Noise margin |
| D. | Bandwidth |
| Answer» E. | |
| 394. |
An 8156 has A15 connected to its CE input. A14 to A8 are unconnected, and AD7 to AC0 are connected.Ignoring shadows, the port addresses |
| A. | 80 H |
| B. | 85 H |
| C. | 82 H, 83 H |
| D. | 80 H to 85 H |
| Answer» E. | |
| 395. |
The 2's complement representation of - 17 is |
| A. | 1110 |
| B. | 1111 |
| C. | 11110 |
| D. | 10001 |
| Answer» C. 11110 | |
| 396. |
Which of the following binary numbers is equivalent to decimal 10? |
| A. | 1010 |
| B. | 1001 |
| C. | 20 MHz |
| D. | 50 MHz |
| Answer» D. 50 MHz | |
| 397. |
A pulse train can be delayed by a finite number of clock periods by using |
| A. | serial in-serial out shift register |
| B. | parallel in serial out shift register |
| C. | serial in-parallel out shift register |
| D. | parallel in parallel out shift register |
| Answer» B. parallel in serial out shift register | |
| 398. |
An I/O processor control the flow of information between |
| A. | cache memory and I/O devices |
| B. | main memory and I/O devices |
| C. | 1 Two I/O devices |
| D. | cache and main memories |
| Answer» C. 1 Two I/O devices | |
| 399. |
Decimal 18.29 when converted int 10's complement will become |
| A. | 81.7707 |
| B. | 81.7 |
| C. | 81.777 |
| D. | 81.077 |
| Answer» B. 81.7 | |
| 400. |
Data are recorded on a 2, 400 ft reel of magnetic tape at a density of 556 characters per inch. If the record length is of 100 characters and 0.75 inch of record gap, the tape utilization factor is |
| A. | 0.85 |
| B. | 0.67 |
| C. | 0.19 |
| D. | 0.08 |
| Answer» D. 0.08 | |