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.
| 51. |
Assertion (A): 2's complement arithmetic is preferred in digital computers .Reason (R): The hardware required to obtain 2's complement is simple. |
| 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 | |
| 52. |
The factors which govern fan out of CMOS gates are |
| A. | maximum permissible propagation delay |
| B. | input capacitance of each load |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 53. |
With 2's complement representation, the range of values that can be represented on the data bus of an 8 bit microprocessor is given by |
| A. | -128 to 127 |
| B. | -128 to +128 |
| C. | -127 to 128 |
| D. | -256 to 256 |
| Answer» B. -128 to +128 | |
| 54. |
In sign magnitude numbers, |
| A. | the leading bit stands for the sign |
| B. | the leading bit is part of the magnitude |
| C. | the leading bit is always 0 |
| D. | the leading bit is always 1 |
| Answer» B. the leading bit is part of the magnitude | |
| 55. |
For a D/A converter, inputs and outputs are given. The output corresponding to digital input 01000 |
| A. | 2.0 V |
| B. | 2.5 V |
| C. | 3.0 V |
| D. | 4.0 V |
| Answer» B. 2.5 V | |
| 56. |
K maps can be drawn |
| A. | only for 2 variables |
| B. | only for 3 variables |
| C. | only for 4 variables |
| D. | for any number of variables |
| Answer» E. | |
| 57. |
In 8085 microprocessor, what is the length of IR (instruction register)? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» C. 12 bits | |
| 58. |
IC counters are |
| A. | synchronous only |
| B. | asynchronous only |
| C. | both synchronous and asynchronous |
| D. | none of the above |
| Answer» D. none of the above | |
| 59. |
Which of the following pairs of octal and binary numbers are not equal? |
| A. | 111 11011₂ = 767₈ |
| B. | 110110101₂ = 665₈ |
| C. | 11010₂ = 3₈ |
| D. | 10101.11₂ = 25.6₈ |
| Answer» D. 10101.11₂ = 25.6₈ | |
| 60. |
What is the gray code word for EX-OR the binary number 101011? |
| A. | 101011 |
| B. | 110101 |
| C. | 111110 |
| D. | 011111 |
| Answer» E. | |
| 61. |
As applied to a flip flop the word edge triggered's means |
| A. | flip flop can change state when clock transition occurs |
| B. | flip flop can change state when clock signal goes from LOW to HIGH only |
| C. | flip flop can change state when clock signal goes from HIGH to LOW only |
| D. | none of the above |
| Answer» B. flip flop can change state when clock signal goes from LOW to HIGH only | |
| 62. |
2's complement number 00011111 = __________ ₁₀ |
| A. | +31 |
| B. | -31 |
| C. | +11 |
| D. | -11 |
| Answer» B. -31 | |
| 63. |
Vectored interrupt is an interrupt that takes the program to a vector location. TRAP vectors to 0024 FI, RST 7.5 to 003 CH, RST 6.5 to 0034 H and |
| A. | RST 5.5 |
| B. | RST 6.5 |
| C. | 24 H to 48 H |
| D. | RST 5.5 to 002 CH |
| Answer» E. | |
| 64. |
Which of the following methods is used for solving differential equations numerically? |
| A. | Runge-Kutta method |
| B. | Gauss-elimination method |
| C. | Newton-Raphson method |
| D. | Any one of these |
| Answer» B. Gauss-elimination method | |
| 65. |
2's complement of (-24) = |
| A. | 11101000 |
| B. | 01001000 |
| C. | 01111111 |
| D. | 00111111 |
| Answer» B. 01001000 | |
| 66. |
Nibble is |
| A. | a string of 4 bits |
| B. | a string of 8 bits |
| C. | a string of 16 bit |
| D. | a string of 64 bits |
| Answer» B. a string of 8 bits | |
| 67. |
A divide by 78 counter can be obtained by |
| A. | 6 numbers of mod-13 counters |
| B. | 13 numbers of mod-6 counters |
| C. | one mod-13 counter followed by mod-6 counter |
| D. | 13 number of mod-13 counters |
| Answer» D. 13 number of mod-13 counters | |
| 68. |
The input to a parity detector is 1001. The output is |
| A. | 0 |
| B. | 1 |
| C. | 0 or 1 |
| D. | indeterminate |
| Answer» B. 1 | |
| 69. |
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. | |
| 70. |
In 8085 microprocessor, how many I/O ports can be accessed by direct method? |
| A. | 8 |
| B. | 256 |
| C. | 32 K |
| D. | 64 K |
| Answer» C. 32 K | |
| 71. |
Which of the following is used as switch? |
| A. | J-K flip-flop |
| B. | Master slave J-K flip-flop |
| C. | T-flip-flop |
| D. | D-flip-flop |
| Answer» E. | |
| 72. |
Two voltages are -5 V and -10 V. In positive logic |
| A. | -5 V is 1 and -10 V is 0 |
| B. | -10 V is 1 and -5 V is 0 |
| C. | -5 V is 1 in some circuits and 0 in others |
| D. | -10 V is 1 in some circuits and 0 in others |
| Answer» B. -10 V is 1 and -5 V is 0 | |
| 73. |
Assertion (A): The access time of memory is lowest in the case of DRAM Reason (R): DRAM uses refreshing cycle. |
| 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» E. | |
| 74. |
A flip flop is a |
| A. | combinational circuit |
| B. | memory element |
| C. | arithmetic element |
| D. | memory or arithmetic element |
| Answer» C. arithmetic element | |
| 75. |
A full adder can be made out of |
| A. | two half adders |
| B. | two half adders and a OR gate |
| C. | two half adders and a NOT gate |
| D. | three half adders |
| Answer» C. two half adders and a NOT gate | |
| 76. |
Gray code is used in devices which convert analog quantities to digital signal because it is |
| A. | more error free |
| B. | much simpler than binary code |
| C. | superior to Excess-3 code |
| D. | absolutely error free |
| Answer» B. much simpler than binary code | |
| 77. |
In 2 out of 5 code, decimal number 8 is |
| A. | 11000 |
| B. | 10100 |
| C. | 11000 |
| D. | 1010 |
| Answer» C. 11000 | |
| 78. |
74 HC series can sink upto 4 mA. The 74 LS series has IIL(max) - 0.4 mA. How many 74 LS inputs be driven by 74 HC output? |
| A. | 100 |
| B. | none |
| C. | 8 |
| D. | 10 |
| Answer» E. | |
| 79. |
The 54/74164 chip is an 8-bit serial-input-parallel-output shift register. The clock is 1 MHz. The time needed to shift a 8-bit binary number into the chip is |
| A. | 1 μs |
| B. | 2 μs |
| C. | 8 μs |
| D. | 16 μs |
| Answer» D. 16 μs | |
| 80. |
A number given in binary as 0101.01 is to be scaled up 4 times. The scaled up binary is |
| A. | 10101 |
| B. | 01.0101 |
| C. | 0404.04 |
| D. | 010.101 |
| Answer» B. 01.0101 | |
| 81. |
Computers use RC circuit for edge triggering. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 82. |
The number of programmable 8 bit registers of 6800 are |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 83. |
The no. of comparators required in a 3 bit comparator type ADC is |
| A. | 2 |
| B. | 3 |
| C. | 7 |
| D. | 8 |
| Answer» D. 8 | |
| 84. |
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 | |
| 85. |
In a JK flip flop toggle means |
| A. | set Q = 1 and Q̅ = 0 |
| B. | set Q = 0 and Q̅ = 1 |
| C. | change the output to the opposite state |
| D. | no change in output |
| Answer» D. no change in output | |
| 86. |
The generic microprocessor contains a zero and a carry flag. These are located on theThe 8156 of a figure has RAM locations from 2000 H to 20 FFH. |
| A. | interrupt control |
| B. | status register |
| C. | either (a) or (b) |
| D. | none of the above |
| Answer» C. either (a) or (b) | |
| 87. |
Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after XRA A? |
| A. | A 6 H, 1 |
| B. | A 6 H, 0 |
| C. | 00 H, 0 |
| D. | 00 H, 1 |
| Answer» D. 00 H, 1 | |
| 88. |
In a programmable counter |
| A. | the starting number for counting can be programmed |
| B. | the modulus can be programmed |
| C. | both the starting number and modulus can be programmed |
| D. | either the starting number or modulus can be programmed |
| Answer» C. both the starting number and modulus can be programmed | |
| 89. |
"Micro-programming" is a technique |
| A. | for programming the microprocessors |
| B. | for writing small programs efficiently |
| C. | for programming the control steps of a computer |
| D. | for programming output/input |
| Answer» D. for programming output/input | |
| 90. |
The initial state of MOD-16 down counter is 0110. What state will it be after 37 clock pulses? |
| A. | Indeterminate |
| B. | 0110 |
| C. | 0101 |
| D. | 0001 |
| Answer» E. | |
| 91. |
-8 is equal to signed binary number |
| A. | 10001000 |
| B. | 00001000 |
| C. | 10000000 |
| D. | 11000000 |
| Answer» B. 00001000 | |
| 92. |
The contents of stack location 2109 H after the call operation will be |
| A. | 00001111 |
| B. | 01010101 |
| C. | 00100000 |
| D. | 00100010 |
| Answer» D. 00100010 | |
| 93. |
A 0 to 6 counter consist of 3 flip-flop and a combinational circuit of 2 input gates. The combinational circuit consist of |
| A. | one AND gate |
| B. | one OR gate |
| C. | one AND and One OR |
| D. | two AND gate |
| Answer» E. | |
| 94. |
The ASCII code is |
| A. | 5-bit code |
| B. | 7-bit code |
| C. | 9-bit code |
| D. | 11-bit code |
| Answer» C. 9-bit code | |
| 95. |
Race condition always arises in |
| A. | synchronous circuit |
| B. | asynchronous circuit |
| C. | combinational circuit |
| D. | digital circuit |
| Answer» C. combinational circuit | |
| 96. |
Assertion (A): CMOS devices have very high speed.Reason (R): CMOS devices have very small physical size and simple geometry. |
| 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» E. | |
| 97. |
For checking the parity of a digital word, it is preferable to use |
| A. | AND gates |
| B. | NAND gates |
| C. | EX-OR gates |
| D. | NOR gates |
| Answer» D. NOR gates | |
| 98. |
Assuming accumulator contain A 64 and the carry is set (1). What will register A and carry (CY) contain after ORA A? |
| A. | A 6 H, 1 |
| B. | A 6 H, 0 |
| C. | 00 H, 0 |
| D. | 00 H, 1 |
| Answer» C. 00 H, 0 | |
| 99. |
The seven bit Hamming code received is 0010001. If even parity has been used, the correct code is |
| A. | 0010001 |
| B. | 1110001 |
| C. | 0110001 |
| D. | 0011001 |
| Answer» E. | |
| 100. |
The code used to reduce the error due to ambiguity in reading of a binary optical encoder is |
| A. | Octal code |
| B. | Excess-3 code |
| C. | gray code |
| D. | BCD code |
| Answer» D. BCD code | |