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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.
| 901. |
A multilevel decoder is more costly as compared to single level decoder. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 902. |
The basic circuit configuration for TTL resembles that of a |
| A. | AND gate |
| B. | NAND gate |
| C. | NOR gate |
| D. | OR gate |
| Answer» C. NOR gate | |
| 903. |
In number system e.g. 6, a “decade” counter has to recycle to 0 at the sixth count. Which of the connections indicate below will realize this resetting? (a logic “0” at the R inputs resets the counters) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 904. |
The boolean expression for shaded area in the given figure is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 905. |
In a 4 input OR gate, the total number of High outputs for the 16 input states are |
| A. | 16 |
| B. | 15 |
| C. | 14 |
| D. | 13 |
| Answer» C. 14 | |
| 906. |
In order to enable TRAP interrupt, which of the following instructions are needed? |
| A. | El only |
| B. | SIM only |
| C. | El and SIM both |
| D. | None |
| Answer» E. | |
| 907. |
The initial state of a Mod-16 counter is 0110. After 37 clock pulses the state of counter will be |
| A. | 1011 |
| B. | 0110 |
| C. | 010 |
| D. | 0001 |
| Answer» B. 0110 | |
| 908. |
Fastest memory cell |
| A. | bubble memory |
| B. | core memory |
| C. | semiconductor memory |
| D. | superconductor memory |
| Answer» D. superconductor memory | |
| 909. |
The radix of a hexadecimal system is |
| A. | 2 |
| B. | 3 |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 910. |
Data can be changed from spatial code to temporal code and vice-versa by using |
| A. | ADC and DAC |
| B. | shift Register |
| C. | synchronous counter |
| D. | timers |
| Answer» C. synchronous counter | |
| 911. |
In 8085 microprocessor, the RST 5.5 interrupt service routine start from location |
| A. | 0020 H |
| B. | 0024 H |
| C. | 0028 H |
| D. | 002 CH |
| Answer» E. | |
| 912. |
A flip-flop circuit is |
| A. | monostable |
| B. | bistable |
| C. | multistable |
| D. | unstable |
| Answer» C. multistable | |
| 913. |
In a T flip-flop the output frequency is |
| A. | same as input frequency |
| B. | half of I/p frequency |
| C. | double the input frequency |
| D. | none |
| Answer» C. double the input frequency | |
| 914. |
The number of memory locations in which 14 address bits can access is |
| A. | 1024 |
| B. | 2048 |
| C. | 4096 |
| D. | 16384 |
| Answer» E. | |
| 915. |
In a Karnaugh map for an expression having 'don't care terms' the don't cares can be treated as |
| A. | 0 |
| B. | 1 |
| C. | 1 or 0 |
| D. | none of the above |
| Answer» D. none of the above | |
| 916. |
Figure given below shows the internal schematic of a TTL AND-OR Invert (AOI) gate, For the input shown in the given figure, the output Y is |
| A. | 0 |
| B. | 1 |
| C. | AB |
| D. | AB |
| Answer» B. 1 | |
| 917. |
A 12-bit binary counter has the following state. The octal number represented is |
| A. | 677 |
| B. | 7163 |
| C. | 7128 |
| D. | 7183 |
| Answer» C. 7128 | |
| 918. |
Decimal 1932 when converted into 10's complement will become |
| A. | 8868 |
| B. | 8068 |
| C. | 8608 |
| D. | 8806 |
| Answer» C. 8608 | |
| 919. |
An index register in digital computer is a register to be used for |
| A. | performing arithmetic and logic operations |
| B. | temporary storage of result |
| C. | counting number of times a program is executed |
| D. | address modification purpose |
| Answer» E. | |
| 920. |
For a NOR SR latch the normal resting state of inputs is |
| A. | S = R = 1 |
| B. | S = 0, R = 1 |
| C. | S = 0, R = 0 |
| D. | S = 1, R = 0 |
| Answer» D. S = 1, R = 0 | |
| 921. |
A parity detector can detect |
| A. | single error only |
| B. | single error or odd number of errors |
| C. | two errors |
| D. | single or two errors |
| Answer» C. two errors | |
| 922. |
Maxterm designation for A + B + C is |
| A. | M₀ |
| B. | M₁ |
| C. | M₃ |
| D. | M₄ |
| Answer» B. M₁ | |
| 923. |
The recently-introduces CD-ROM PC by Head Start Technologies Co. of New York enables users to view or play __________ . |
| A. | vast amounts of text |
| B. | graphics |
| C. | music |
| D. | all of the above |
| Answer» E. | |
| 924. |
In a digital system there are three inputs ABC. Output should be high when atleast two inputs are high. Then output = |
| A. | AB + BC + AC |
| B. | ABC + ABC̅ + A̅ BC + AB̅C |
| C. | AB + BC + AC̅ |
| D. | AB̅ + BC̅ + A̅C |
| Answer» C. AB + BC + AC̅ | |
| 925. |
Assertion (A): Decoder is not a combinational circuit.Reason (R): Every memory element of semi conductor form has a decoder. |
| 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 | |
| 926. |
The number of FF required for a divide by 12 circuit is |
| A. | 16 |
| B. | 12 |
| C. | 8 |
| D. | 4 |
| Answer» E. | |
| 927. |
A combination circuit is one in which the output depends on |
| A. | input combination at that time |
| B. | input combination and previous output |
| C. | input combination and previous input |
| D. | present output and previous output |
| Answer» B. input combination and previous output | |
| 928. |
If a RAM has 34 bits in its MAR and 16 bits in its MDR, then its capacity will be |
| A. | 32 GB |
| B. | 16 GB |
| C. | 32 MB |
| D. | 16 MB |
| Answer» B. 16 GB | |
| 929. |
The resolution of a 12-bit D/A converter using a binary ladder with + 10V as the full scale output will be |
| A. | 2.44 mV |
| B. | 3.50 mV |
| C. | 4.32 mV |
| D. | 5.12 mV |
| Answer» B. 3.50 mV | |
| 930. |
39.12₁₀ = __________ |
| A. | 10111.0001111 |
| B. | 100011.0001111 |
| C. | 100001.0001111 |
| D. | 001111.0001111 |
| Answer» B. 100011.0001111 | |
| 931. |
A 6 bit ladder A/D converter has input 101001. The output is (assume 0 = 0 V and 1 = 10 V) |
| A. | 4.23 |
| B. | 6.41 |
| C. | 5.52 |
| D. | 9.23 |
| Answer» C. 5.52 | |
| 932. |
Assertion (A): A 4 input variable logic circuit can be implemented using a 8 : 1 multiplexer.Reason (R): When a multiplexer is used as a logic function generator, the logic design 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» C. A is true, R is false | |
| 933. |
Assertion (A): A multiplexer can be used for data routing.Reason (R): A multiplexer has one input and many outputs. |
| 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 | |
| 934. |
Serial input data of 8085 can be loaded into bit-7 of the accumulator by |
| A. | executing a RIM instruction |
| B. | executing RSTI |
| C. | using TRAP |
| D. | none of the above |
| Answer» B. executing RSTI | |
| 935. |
Monostable multivibrator is called one-shot or single-shot circuit because it |
| A. | can be used once |
| B. | can be used single and not with other circuits. |
| C. | always returns by itself to its single stable state |
| D. | changes to quasistable for a fixed period of time upon receipt of triggering signal. |
| Answer» D. changes to quasistable for a fixed period of time upon receipt of triggering signal. | |
| 936. |
In floating point representation, the accuracy is |
| A. | 10 bit |
| B. | 9 bit |
| C. | 8 bit |
| D. | 6 bit |
| Answer» C. 8 bit | |
| 937. |
In 8085 microprocessor, in order to enable INTR interrupt, which of the following instruction are needed? |
| A. | EI only |
| B. | SIM only |
| C. | El and SIM both |
| D. | None |
| Answer» B. SIM only | |
| 938. |
In a JK flip flop output Q = 1 and it does not change when clock pulse is applied. The possible combination of Jn and Kn is (X denotes don't care) |
| A. | X and 0 |
| B. | X and 1 |
| C. | 0 and X |
| D. | 1 and X |
| Answer» B. X and 1 | |
| 939. |
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 | |
| 940. |
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. | |
| 941. |
A mod-10 counter can divide the clock frequency by a factor of |
| A. | 10 |
| B. | 20 |
| C. | 210 |
| D. | 102 |
| Answer» B. 20 | |
| 942. |
The number of comparators of needed in a parallel conversion type 8 bit A to D converter is |
| A. | 8 |
| B. | 16 |
| C. | 255 |
| D. | 256 |
| Answer» D. 256 | |
| 943. |
The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X results in a binary number without overflow. This implies that the result is |
| A. | -ve and is in normal form |
| B. | -ve and 2's complement form |
| C. | +ve and is in normal form |
| D. | +ve and in 2's complement |
| Answer» E. | |
| 944. |
The decimal equivalent of ABC₁₆ is |
| A. | 348 |
| B. | 2583 |
| C. | 2748 |
| D. | 33 |
| Answer» D. 33 | |
| 945. |
The output of basic DTL configuration is |
| A. | low when one of the input is high |
| B. | low when all inputs are high |
| C. | high when all inputs are high |
| D. | high when all inputs are low |
| Answer» C. high when all inputs are high | |
| 946. |
Decimal 17 in octal system is represented by |
| A. | 888 |
| B. | 111 |
| C. | 21 |
| D. | 27 |
| Answer» D. 27 | |
| 947. |
The number of cells in a 4 variable K map is |
| A. | 16 |
| B. | 8 |
| C. | 4 |
| D. | 32 |
| Answer» B. 8 | |
| 948. |
In 2's complement form, - 2 is |
| A. | 1011 |
| B. | 1110 |
| C. | 1100 |
| D. | 1010 |
| Answer» C. 1100 | |
| 949. |
1's complement of 11100110 is |
| A. | 00011001 |
| B. | 10000001 |
| C. | 00011010 |
| D. | 00000000 |
| Answer» B. 10000001 | |
| 950. |
Assertion (A): In a BCD to 7 segment decoder the number of outputs active at one time is always the same.Reason (R): A decoder can be used to interface BCD input to LED display. |
| 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. | |