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.
| 401. |
The initial contents of the 4 bit serial in parallel out right shift, shift register shown in figure is 0110. After three clock pulses are applied, the contents of the shift register will be |
| A. | 0000 |
| B. | 0101 |
| C. | 1010 |
| D. | 1111 |
| Answer» D. 1111 | |
| 402. |
If one wants to design a binary counter, preferred type of flip-flop is |
| A. | D-type |
| B. | SR type |
| C. | Latch |
| D. | JK type |
| Answer» B. SR type | |
| 403. |
In a positive edge triggered JK flip flop |
| A. | High J and High K produce inactive state |
| B. | Low J and High K produce inactive state |
| C. | Low J and Low K produce inactive state |
| D. | High J and Low K produce inactive state |
| Answer» D. High J and Low K produce inactive state | |
| 404. |
A full adder is to be implemented using half adders and OR gates. A 4 bit parallel adder without any initial carry requires |
| A. | 8 half adders and 4 OR gates |
| B. | 8 half adders and 3 OR gates |
| C. | 7 half adders and 3 OR gates |
| D. | 7 half adders and 4 OR gates |
| Answer» D. 7 half adders and 4 OR gates | |
| 405. |
NAND gates can be used to produce edge triggering. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 406. |
A 3 bit binary adder should use |
| A. | 3 full adders |
| B. | 2 full adders and 1 half adder |
| C. | 1 full adder and 2 half adders |
| D. | 3 half adders |
| Answer» C. 1 full adder and 2 half adders | |
| 407. |
A sequence detector is required to give a logical output of 1 whenever the sequence 1011 is detected in the incoming pulse stream. Minimum number of flip-flops needed to built the sequence detector is |
| A. | 4 |
| B. | 3 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 408. |
Assertion (A): ECL gate has very high speed of operation.Reason (R): Transistors in ECL do not go into saturation region. |
| 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» B. Both A and R are correct but R is not correct explanation of A | |
| 409. |
Octal 16 is equal to decimal |
| A. | 13 |
| B. | 14 |
| C. | 15 |
| D. | 16 |
| Answer» C. 15 | |
| 410. |
Consider the following two statements:Statements 1: stable multivibrator can be used for generating square wave.Statement 2 : stable multivibrator can be used for storing binary information. |
| A. | only statement 1 is correct |
| B. | only statement 2 is correct |
| C. | both statements are correct |
| D. | both the statements 1 and 2 are not correct |
| Answer» D. both the statements 1 and 2 are not correct | |
| 411. |
Figure shows three pulse train inputs to a 3-input OR gate. Assuming positive logic, the output pulse rate train in figure (b) would be |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 412. |
A 4 input AND gate is equivalent to |
| A. | 4 switches in parallel |
| B. | 2 switches in series and 2 in parallel |
| C. | three switches in parallel and one in series |
| D. | 4 switches in series |
| Answer» E. | |
| 413. |
As the number of flip flops are increased, the total propagation delay of |
| A. | ripple counter increases but that of synchronous counter remains the same |
| B. | both ripple and synchronous counters increase |
| C. | both ripple and synchronous counters remain the same |
| D. | ripple counter remains the same but that of synchronous counter increases |
| Answer» B. both ripple and synchronous counters increase | |
| 414. |
CD4010 is a |
| A. | inverting buffer |
| B. | non-inverting hex buffer |
| C. | NOR IC |
| D. | NAND IC |
| Answer» C. NOR IC | |
| 415. |
A microcomputer has a 64 K memory. What is the hexadecimal notation for the first memory location? |
| A. | 0000 |
| B. | FFFF |
| C. | 0FFF |
| D. | 3FFF |
| Answer» B. FFFF | |
| 416. |
In 8085 microprocessor, when TRAP interrupt is triggered program control is transferred to location |
| A. | 0020 H |
| B. | 0024 H |
| C. | 0028 H |
| D. | 002 CH |
| Answer» C. 0028 H | |
| 417. |
An instruction used to set the carry flag in a computer can be classified as |
| A. | data transfer |
| B. | arithmetic |
| C. | Logical |
| D. | program control |
| Answer» D. program control | |
| 418. |
In a clocked latch, clock drives |
| A. | R NAND gate |
| B. | S NAND gate |
| C. | both R and S NAND gates |
| D. | either R or S NAND gates |
| Answer» D. either R or S NAND gates | |
| 419. |
In 8085 microprocessor, even after a Reset operation which of the following interrupts remains enabled? |
| A. | INTR |
| B. | RST 5.5 |
| C. | RST 7.5 |
| D. | TRAP |
| Answer» E. | |
| 420. |
In a D-type latch EN = 1, D = 1, the O/P is |
| A. | 1 |
| B. | 0 |
| C. | don't care |
| D. | blocked |
| Answer» B. 0 | |
| 421. |
Assertion (A): A presettable counter can be preset to any desired starting pointReason (R): The maximum frequency of a ripple counter depends on the modulus. |
| 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 | |
| 422. |
The expression Y = πM (0, 1, 3, 4) is |
| A. | POS |
| B. | SOP |
| C. | Hybrid |
| D. | none of the above |
| Answer» B. SOP | |
| 423. |
An SR flip flop can be built using NOR gates or NAND gates. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 424. |
In a JK master slave flip flop |
| A. | master is clocked when clock is low |
| B. | slave is clocked when clock is high |
| C. | master is clocked when clock is high and slave is clocked when clock is low |
| D. | master is clocked when clock is low and slave is clocked when clock is high |
| Answer» D. master is clocked when clock is low and slave is clocked when clock is high | |
| 425. |
What does the B register contain after the first MOV B, A has been executed? |
| A. | 40 H |
| B. | 60 H |
| C. | 80 H |
| D. | 80 D |
| Answer» B. 60 H | |
| 426. |
100101₂ is equal to decimal number |
| A. | 47 |
| B. | 37 |
| C. | 21 |
| D. | 17 |
| Answer» C. 21 | |
| 427. |
Assertion (A): Different symbols are used for different gatesReason (R): IEEE symbols are the same as traditional symbols for gates. |
| 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 | |
| 428. |
A 4 bit ripple counter is in 0000 state. The clock pulses are applied and then removed. The counter reads 0011. The number of clock pulses which have occurred are |
| A. | 3 |
| B. | 3 or 19 |
| C. | 3 or 19 or 35 |
| D. | none of the above |
| Answer» D. none of the above | |
| 429. |
Typical switching time for ECL is |
| A. | 5 nano seconds |
| B. | 5 micro seconds |
| C. | 5 milli seconds |
| D. | 5 seconds |
| Answer» B. 5 micro seconds | |
| 430. |
With a JK master-slave flip-flop the master is clocked when the clock is __________ , and the slave is triggered when the clock is __________ . |
| A. | low, low |
| B. | high, low |
| C. | low, high |
| D. | high, high |
| Answer» C. low, high | |
| 431. |
Mark the false statement: |
| A. | since wave-shape of a digital signal is unimportant, linear amplifiers are not required |
| B. | the precise amplitude of a digital signal is also unimportant provided two voltage levels (0 and 1) are quite different |
| C. | the leading and trailing edges of a digital signal need not be sharp |
| D. | actual digital waves have rise and fall times of the order of a few nano seconds |
| Answer» D. actual digital waves have rise and fall times of the order of a few nano seconds | |
| 432. |
A TTL circuit with totem pole output has |
| A. | high output impedance |
| B. | low output impedance |
| C. | very high output impedance |
| D. | none of the above |
| Answer» C. very high output impedance | |
| 433. |
When a bit is 0 is a DDR, it makes the corresponding port pin an __________ On the other hand, a 1 bit programs a __________ Pin. |
| A. | output, input |
| B. | output, output |
| C. | input, input |
| D. | input, output |
| Answer» E. | |
| 434. |
Choose the appropriate turn on and turn off time of a FET |
| A. | 1 ns, 10ns |
| B. | 6 ns, 18ns |
| C. | 4 ns, 8 ns |
| D. | 10 ns, 10 ns |
| Answer» C. 4 ns, 8 ns | |
| 435. |
Which of the following is decimal equivalent of the binary 1111111? |
| A. | 27 |
| B. | 87 |
| C. | 127 |
| D. | 167 |
| Answer» D. 167 | |
| 436. |
In a 3 input NOR gate, the number of states in which output is 1 equals |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 437. |
The number of flip-flops required to build a mod-19 counter is |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» D. 7 | |
| 438. |
In 8085 microprocessor, what is the memory address stored on the stack, when the program is interrupted? |
| A. | 0210 H |
| B. | 0.211 H |
| C. | 0118 H |
| D. | 020 FH |
| Answer» C. 0118 H | |
| 439. |
A full subtractor has a total of |
| A. | 2 inputs |
| B. | 3 inputs |
| C. | 4 inputs |
| D. | 5 inputs |
| Answer» C. 4 inputs | |
| 440. |
In which function is each term known as minterm? |
| A. | SOP |
| B. | POS |
| C. | Hybrid |
| D. | Both SOP and POS |
| Answer» B. POS | |
| 441. |
ADC 0804 is a |
| A. | dual slope A/D converter |
| B. | single slope A/D converter |
| C. | successive approximation A/D converter |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 442. |
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. | |
| 443. |
F's complement of (2BFD)hex is |
| A. | E 304 |
| B. | D 403 |
| C. | D 402 |
| D. | C 403 |
| Answer» D. C 403 | |
| 444. |
A multiple emitter transistor has many emitters and collectors. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 445. |
Which of the- following display consumes least amount of power? |
| A. | LCD |
| B. | LED |
| C. | Fluorescent display |
| D. | All display consume same power |
| Answer» B. LED | |
| 446. |
Minimum number of J-K flip-flop needed to construct a BCD counter is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 447. |
The widely used binary multiplication method is |
| A. | repeated addition |
| B. | add and shift |
| C. | shift and add |
| D. | any of the above |
| Answer» C. shift and add | |
| 448. |
Thu advantage of using a dual stop ADC in a digital voltmeter is that |
| A. | its conversion time is small |
| B. | its accuracy high |
| C. | output is in BCD format |
| D. | it does not require a comparator |
| Answer» C. output is in BCD format | |
| 449. |
The hexadecimal number 5 F is equal to binary number |
| A. | 1010011 |
| B. | 1011001 |
| C. | 1010101 |
| D. | 1011111 |
| Answer» E. | |
| 450. |
__________ switch, a T flip-flop is used as __________ switch, a T flip-flop is used as switch |
| A. | toggled, delay |
| B. | delay, toggle |
| C. | set reset |
| D. | reset, set |
| Answer» C. set reset | |