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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.
| 851. |
How many and what are the machine cycles needed for execution of MOV D, C? |
| A. | 1, Fetch |
| B. | 2, Fetch and Memory Read |
| C. | 2, Memory Read and Memory write |
| D. | 2, Fetch 4 Bus idle |
| Answer» B. 2, Fetch and Memory Read | |
| 852. |
The output of the 74 series of TTL gates is taken from a BST in |
| A. | totem pole and common collector configuration |
| B. | either totem pole or open collector configuration |
| C. | common base configuration |
| D. | common collector configuration |
| Answer» C. common base configuration | |
| 853. |
The total number of fundamental products of three variables is |
| A. | 3 |
| B. | 5 |
| C. | 8 |
| D. | 16 |
| Answer» D. 16 | |
| 854. |
100101.1011₂ = __________ . |
| A. | 115.22₈ |
| B. | 115.54₈ |
| C. | 215.54₈ |
| D. | 100.01₈ |
| Answer» C. 215.54₈ | |
| 855. |
The minimum number of 2 input NAND gates required to implement Boolean function A B̅ C is A, B, C are available is |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 856. |
A 4 bit synchronous counter has flip flops having propagation delay of 50 ns each and AND gates having propagation delay of 20 ns each. The maximum frequency of clock pulses can be |
| A. | 20 MHz |
| B. | 50 MHz |
| C. | 14.3 MHz |
| D. | 5 MHz |
| Answer» D. 5 MHz | |
| 857. |
The hexadecimal number system is |
| A. | widely used in analyzing and programming microprocessors |
| B. | an obsolete system no more in use |
| C. | used in calculators only |
| D. | none of the above |
| Answer» B. an obsolete system no more in use | |
| 858. |
Which one of the following is correct? |
| A. | RAM is a volatile memory but ROM is non-volatile memory |
| B. | RAM is non-volatile memory but ROM is volatile memory |
| C. | Both ROM and RAM are volatile but in ROM data is not lost when power is switched off |
| D. | Both ROM and RAM are non-volatile but in RAM data is lost when power is switched off |
| Answer» B. RAM is non-volatile memory but ROM is volatile memory | |
| 859. |
Assertion (A): Hamming code is commonly used for error correction Reason (R): In Hamming code the number of parity bits increases as the number of information bits increases. |
| 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 | |
| 860. |
A Read/Write memory chip has a capacity of 64 k bytes. Assuming separate data and address line and availability of chip enable signal, what is the minimum number of pins required in the IC chip? |
| A. | 28 |
| B. | 26 |
| C. | 24 |
| D. | 22 |
| Answer» B. 26 | |
| 861. |
In one of the codes for transfer of numbers the code for the succeeding number differs from that of the number only in the change of a single digit. The code is |
| A. | ASCII |
| B. | Excess 3 CODE |
| C. | Gray CODE |
| D. | none of these |
| Answer» D. none of these | |
| 862. |
(100101)₂ is |
| A. | (37)₁₀ |
| B. | (69)₁₀ |
| C. | (41)₁₀ |
| D. | (5)₁₀ |
| Answer» B. (69)₁₀ | |
| 863. |
The number of digit 1 present in the binary representation of 3 x 512 + 7 x 64 + 5 x 8 + 3 is |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 12 |
| Answer» C. 10 | |
| 864. |
In a modem digital computer, a subtractor in normally not used because |
| A. | subtractors are very expensive |
| B. | the design of a subtractor is very complex |
| C. | the adder is geared for doing subtraction |
| D. | most of the programs do not require subtraction |
| Answer» D. most of the programs do not require subtraction | |
| 865. |
In an op-amp a virtual ground is a ground for |
| A. | voltage only |
| B. | current only |
| C. | both voltage and current |
| D. | neither voltage nor current |
| Answer» B. current only | |
| 866. |
T- FF used as a |
| A. | transfer Data switch |
| B. | toggle switch |
| C. | time delay switch |
| D. | none |
| Answer» C. time delay switch | |
| 867. |
DeMorgan's first theorem is = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 868. |
Assertion (A): XOR gate is not universal gate.Reason (R): It is not possible to realize any Boolean function using XOR gates only. |
| 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 | |
| 869. |
Assertion (A): In a serial in-serial out shift register, access is available only to the left most or right most flip flops Reason (R): If the output of a shift register is feedback to serial input it can be used as a ring counter. |
| 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 | |
| 870. |
What is the normal range of analog input voltage? |
| A. | 0 to 1 V |
| B. | 0 to 5 V |
| C. | 5 to 15 V |
| D. | 15V to 30V |
| Answer» C. 5 to 15 V | |
| 871. |
With the switch in STOP position, Y will be equal to |
| A. | 0 |
| B. | 1 |
| C. | CLK |
| D. | none of these |
| Answer» C. CLK | |
| 872. |
For emitter-couple logic, the switching speed is very high because |
| A. | negative logic is used |
| B. | the transistors are not saturated when conducting |
| C. | emitter-coupled transistors are used |
| D. | multi-emitter transistors are used |
| Answer» C. emitter-coupled transistors are used | |
| 873. |
The characteristic equation of an SR flip-flop in given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 874. |
A Charge Couple Device (CCD) is a |
| A. | RAM |
| B. | sequential accessed memory |
| C. | content addressable memory |
| D. | read only memory |
| Answer» C. content addressable memory | |
| 875. |
For a MOD-12 counter, the FF has a tpd = 60 ns The NAND gate has a tpd of 25 n sec. The clock frequency is |
| A. | 3.774 MHz |
| B. | > 3.774 MHz |
| C. | < 3.774 MHz |
| D. | 4.167 MHz |
| Answer» B. > 3.774 MHz | |
| 876. |
What binary number does second row represent? |
| A. | 01111001 |
| B. | 01010101 |
| C. | 10101010 |
| D. | 11101010 |
| Answer» E. | |
| 877. |
Consider the following registers: 1. A accumulator and B register2. B and C registers3. D and E registers4. H and L registers Which of these 8-bit registers of 8085 μP can be paired together to make a 16-bit register? |
| A. | 1, 3 and 4 |
| B. | 2, 3 and 4 |
| C. | 1 and 2 |
| D. | 1, 2 and 3 |
| Answer» C. 1 and 2 | |
| 878. |
In 8085 microprocessor, what is the length of temporary register? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» C. 12 bits | |
| 879. |
Access time of a storage is the time required |
| A. | to write one word into the memory |
| B. | to read one word from the memory |
| C. | to write one word into and to read one word from the memory |
| D. | either to write one word or to read one word |
| Answer» E. | |
| 880. |
Advanced low power Schottky is a part of |
| A. | ECL family |
| B. | CMOS family |
| C. | TTL family |
| D. | none of the above |
| Answer» D. none of the above | |
| 881. |
A Schottky diode has |
| A. | no minority carriers and very low voltage drop in forward direction |
| B. | no minority carriers and very high voltage drop in forward direction |
| C. | large number of minority carriers and very high voltage drop in forward direction |
| D. | large number of minority carriers and very low voltage drop in forward direction |
| Answer» B. no minority carriers and very high voltage drop in forward direction | |
| 882. |
Which one of the following is used to change data from spatial code to temporal code? |
| A. | Shift register |
| B. | Counter |
| C. | A/D converters |
| D. | Combinational circuits |
| Answer» B. Counter | |
| 883. |
In a gate output is Low if and only if all inputs are High. The gate is |
| A. | OR |
| B. | AND |
| C. | NOR |
| D. | NAND |
| Answer» E. | |
| 884. |
A logical expression Y = A + A̅B is equal to |
| A. | Y = AB |
| B. | Y = A̅B |
| C. | Y = A̅ + B |
| D. | Y = A + B |
| Answer» E. | |
| 885. |
In a JK master slave flip flop race condition does not occur. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 886. |
Which of the following characteristics is not true for TTL Logic? |
| A. | Good speed |
| B. | Low power dissipation per gate |
| C. | High cost |
| D. | None of these |
| Answer» D. None of these | |
| 887. |
A buffer is a device that isolates other devices. Typically a buffer has |
| A. | a high input impedance and a low output impedance |
| B. | a high input impedance as well as output impedance |
| C. | a low input impedance and a high output impedance |
| D. | a low input impedance as well as output impedance |
| Answer» B. a high input impedance as well as output impedance | |
| 888. |
In 8085 microprocessor, if interrupt service requests have been received from all of the following interrupts, then which one will be serviced first? |
| A. | RST 5.5 |
| B. | RST 6.5 |
| C. | RST 7.5 |
| D. | None |
| Answer» D. None | |
| 889. |
What will be the maximum conversion time in 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). |
| A. | 108 sec |
| B. | 63 μ sec |
| C. | 40 sec |
| D. | 80 μ sec |
| Answer» B. 63 μ sec | |
| 890. |
Assertion (A): A demultiplexer can be used as a decoder.Reason (R): A demultiplexer can be built by using AND gates only. |
| 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 | |
| 891. |
What is the terminal count in decimal form? |
| A. | 1579 |
| B. | 1681 |
| C. | 1881 |
| D. | 2014 |
| Answer» B. 1681 | |
| 892. |
Which of the following bus is used to transfer data from main memory to peripheral device? |
| A. | DMA bus |
| B. | Output bus |
| C. | Input bus |
| D. | Data bus |
| Answer» B. Output bus | |
| 893. |
Large scale integration refers to |
| A. | more than 50 gates on the same chip |
| B. | more than 80 gates on the same chip |
| C. | more than 100 gates on the same chip |
| D. | none of the above |
| Answer» D. none of the above | |
| 894. |
Which material is generally used for LED? |
| A. | Compounds of silica |
| B. | Compounds of gallium |
| C. | Compounds of phosphorus |
| D. | Compounds of sulphur |
| Answer» C. Compounds of phosphorus | |
| 895. |
A certain JK FF has tpd = 12 n sec the largest MOD counter that can be constructed from these FF and still operate up to 10 MHz is |
| A. | any |
| B. | 8 |
| C. | 256 |
| D. | 10 |
| Answer» D. 10 | |
| 896. |
As compared to TTL, ECL has |
| A. | lower power dissipation |
| B. | lower propagation delay |
| C. | higher propagation delay |
| D. | higher noise margin |
| Answer» C. higher propagation delay | |
| 897. |
SSI is used in flip flops. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 898. |
In a 3 input NAND gate, the number of states in which output is 1 equals |
| A. | 8 |
| B. | 1 |
| C. | 6 |
| D. | 5 |
| Answer» C. 6 | |
| 899. |
Binary number 1101 is equal to octal number |
| A. | 17 |
| B. | 16 |
| C. | 15 |
| D. | 14 |
| Answer» D. 14 | |
| 900. |
The density of dynamic RAM is |
| A. | the same as static RAM |
| B. | less than that of static RAM |
| C. | more than that of static RAM |
| D. | either equal or less than that of static RAM |
| Answer» D. either equal or less than that of static RAM | |