MCQOPTIONS
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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.
| 1001. |
The number of LED display indicators in logic probe are |
| A. | 1 |
| B. | 2 |
| C. | 1 or 2 |
| D. | 4 |
| Answer» C. 1 or 2 | |
| 1002. |
The access time of ROM using bipolar transistors is about |
| A. | 1 sec |
| B. | 1 mili sec |
| C. | 1 μ sec |
| D. | 1 n sec |
| Answer» D. 1 n sec | |
| 1003. |
4 bit 2's complement representation of a decimal number is 1000. The number is |
| A. | 8 |
| B. | 0 |
| C. | -7 |
| D. | -8 |
| Answer» E. | |
| 1004. |
For the logic circuit of the given figure the simplified Boolean expression is |
| A. | Y = AB + A C |
| B. | Y = (AB) (A C) |
| C. | Y = ABC |
| D. | Y = A B + A C |
| Answer» B. Y = (AB) (A C) | |
| 1005. |
In a shift register the data is loaded in one operation but shifted out one bit at a time, The shift register is |
| A. | serial in-serial out |
| B. | parallel in-serial out |
| C. | serial in-parallel out |
| D. | parallel in-parallel out |
| Answer» C. serial in-parallel out | |
| 1006. |
The number of digits in octal system is |
| A. | 8 |
| B. | 7 |
| C. | 9 |
| D. | 10 |
| Answer» B. 7 | |
| 1007. |
Four MSI TTL 4-bit ripple counters are cascaded to form a 16-bit binary counter. Its propagation delay is about __________ nanoseconds. |
| A. | 70 |
| B. | 140 |
| C. | 210 |
| D. | 280 |
| Answer» E. | |
| 1008. |
A DAC has full scale output of 5 V. If accuracy is ± 0.2% the maximum error for an output of 1 V is |
| A. | 5 mV |
| B. | 10 mV |
| C. | 2 mV |
| D. | 20 mV |
| Answer» C. 2 mV | |
| 1009. |
A + A . B = |
| A. | B |
| B. | A . B |
| C. | A |
| D. | A or B |
| Answer» D. A or B | |
| 1010. |
In C-language f- = 9 is equivalent to |
| A. | f = -9 |
| B. | f = f - 9 |
| C. | f = 9 - 1 |
| D. | #NAME? |
| Answer» C. f = 9 - 1 | |
| 1011. |
What will be conversion rate for a counter type A/D converter contains a 4 bit binary ladder and a counter driven by a 2 MHz clock. Then conversion time |
| A. | 125 |
| B. | 125 x 103 |
| C. | 125 x 106 |
| D. | None |
| Answer» C. 125 x 106 | |
| 1012. |
Which has the highest power dissipation per gate? |
| A. | ECL |
| B. | TTL |
| C. | CMOS |
| D. | PMOS |
| Answer» B. TTL | |
| 1013. |
Race condition occurs in |
| A. | synchronous circuit |
| B. | asynchronous circuit |
| C. | combinational circuit |
| D. | all the Digital circuit |
| Answer» C. combinational circuit | |
| 1014. |
A 4 : 1 multiplexer requires __________ data select line. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 1015. |
For the K map of the given figure the simplified Boolean expression is |
| A. | ACD + ABD + BCD |
| B. | ACD + BCD |
| C. | ACD + ABD |
| D. | none of the above |
| Answer» C. ACD + ABD | |
| 1016. |
The fetching, decoding and executing of an instruction is broken down into several time intervals. Each of these intervals, involving one or more clock periods, is called a |
| A. | instruction cycle |
| B. | machine cycle |
| C. | process cycle |
| D. | none of the above |
| Answer» C. process cycle | |
| 1017. |
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 | |
| 1018. |
In an 8085 microprocessor, the instruction CMP B has been executed while the content of the accumulator is less than that of register B, As a result. |
| A. | carry flag will be set but zero flag will be reset |
| B. | carry flag will be reset but zero flag will be set |
| C. | both carry flag and zero flag will be reset |
| D. | both carry flag and zero flag will be set |
| Answer» B. carry flag will be reset but zero flag will be set | |
| 1019. |
Binary 101010 is equivalent to decimal number |
| A. | 24 |
| B. | 42 |
| C. | 44 |
| D. | 64 |
| Answer» C. 44 | |
| 1020. |
Assertion (A): R-2R ladder type DAC has higher speed of operation than weighted resistor DAC Reason (R): R-2R ladder type DAC uses only two different values of resistor network uses many different values of resistors |
| 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 | |
| 1021. |
What is the gray code word for EX-OR the binary number 101011? |
| A. | 101011 |
| B. | 110101 |
| C. | 111110 |
| D. | 11111 |
| Answer» E. | |
| 1022. |
Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after ADI A4H? |
| A. | 4 AH, 0 |
| B. | 4 AH, 1 |
| C. | 4 BH, 0 |
| D. | 4 BH, 1 |
| Answer» C. 4 BH, 0 | |
| 1023. |
In order to enable RST 5.5, RST 6.5 and RST 7.5 interrupts, which of the following instructions are needed? |
| A. | El only |
| B. | SIM only |
| C. | El and SIM only |
| D. | None |
| Answer» D. None | |
| 1024. |
For a 4096 x 8 EPROM, the number of address lines is |
| A. | 14 |
| B. | 12 |
| C. | 10 |
| D. | 8 |
| Answer» C. 10 | |
| 1025. |
When two 16-input multiplexers drive a 2-input MUX, what is the result? |
| A. | 2-input MUX |
| B. | 4-input MUX |
| C. | 16-input MUX |
| D. | 32 input MUX |
| Answer» E. | |
| 1026. |
7483 is a TTL binary adder. It can add |
| A. | two 4-bit binary numbers |
| B. | four 6-bit binary numbers |
| C. | four 8-bit binary numbers |
| D. | any number of 4-bit numbers |
| Answer» B. four 6-bit binary numbers | |
| 1027. |
If noise margin is high, there is lesser chance of false operation. |
| A. | 1 |
| B. | |
| C. | 8868 |
| D. | 8060 |
| Answer» B. | |
| 1028. |
The Boolean expression A ‚äï B is equivalent to |
| A. | AB + AB |
| B. | AB + AB |
| C. | B |
| D. | A |
| Answer» C. B | |
| 1029. |
In magnetic film memory, the memory element consits of |
| A. | plated wires |
| B. | superconductive material |
| C. | nickel iron alloy |
| D. | doped aluminium |
| Answer» D. doped aluminium | |
| 1030. |
Data from a satellite is received in serial form (1 bit after another). If this data is coming at a 5 MHz rate and if the clock frequency is 5 MHz how long will it take to serially load a word in a 32-bit shift register? |
| A. | 1.6ms |
| B. | 3.2ms |
| C. | 6.4ms |
| D. | 12.8ms |
| Answer» D. 12.8ms | |
| 1031. |
For the K map in the given figure the simplified Boolean expression is |
| A. | A C + A D + ABC |
| B. | A C + A D + ABC |
| C. | A C + A D + ACD |
| D. | A C + A D + AB C |
| Answer» B. A C + A D + ABC | |
| 1032. |
A half adder can be used only for adding |
| A. | 1 s |
| B. | 2 s |
| C. | 4 s |
| D. | 8 s |
| Answer» B. 2 s | |
| 1033. |
The number of bits in ASCII is |
| A. | 12 |
| B. | 10 |
| C. | 9 |
| D. | 7 |
| Answer» E. | |
| 1034. |
The contents of the commands register are 23 H. Then port C |
| A. | is an input port |
| B. | is an output port |
| C. | is both input as well as output port |
| D. | none of the above |
| Answer» B. is an output port | |
| 1035. |
How many flag are there in 8085 microprocessor? |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 1036. |
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 | |
| 1037. |
A 4 line to 16 line decoder has |
| A. | 16 inputs and 4 outputs |
| B. | 4 inputs and 16 outputs |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» C. either (a) or (b) | |
| 1038. |
In a flip-flop with a NAND latch, a low R and a low S produces |
| A. | active condition |
| B. | inactive condition |
| C. | race condition |
| D. | dead condition |
| Answer» D. dead condition | |
| 1039. |
Assertion (A): Master slave JK flip flop is commonly used in high speed synchronous circuitry Reason (R): Master slave JK flip flop uses two JK flip flops in cascade. |
| 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. | |
| 1040. |
Which of the following operation are performed on linear queues?Testing a linear queue for underflowEnqueue operationDequeue operationTesting a linear queue for overflow. Select the correct answer using the codes given below the lists |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 4 |
| C. | 1, 3 and 4 |
| D. | 1, 2, 3 and 4 |
| Answer» E. | |
| 1041. |
RAM can be expanded to |
| A. | increase word size |
| B. | increase word number |
| C. | either increase word size or increase word number |
| D. | none of the above |
| Answer» D. none of the above | |
| 1042. |
D FF can be used as a |
| A. | differentiator |
| B. | divider circuit |
| C. | delay switch |
| D. | none |
| Answer» D. none | |
| 1043. |
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. | |
| 1044. |
Which of the following is non-saturating? |
| A. | TTL |
| B. | CMOS |
| C. | ECL |
| D. | Both (a) and (b) |
| Answer» D. Both (a) and (b) | |
| 1045. |
Find the FSV (full scale voltage) in a 6 bit R-2R ladder D/A converter has a reference voltage of 6.5 V. |
| A. | 6.4 V |
| B. | 0.1 V |
| C. | 7 V |
| D. | 8 V |
| Answer» B. 0.1 V | |
| 1046. |
In 8085 microprocessor, what is the length of Data Buffer Register? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» C. 12 bits | |
| 1047. |
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. | |
| 1048. |
The number of flags available in 6800 are |
| A. | 6 |
| B. | 5 |
| C. | 7 |
| D. | 4 |
| Answer» B. 5 | |
| 1049. |
Which device has one input and many outputs? |
| A. | Multiplexer |
| B. | Demultiplexer |
| C. | Counter |
| D. | Flip flop |
| Answer» C. Counter | |
| 1050. |
Dynamic memory cells are constructed using |
| A. | FETs |
| B. | MOSFETs |
| C. | Transistors |
| D. | Flip flops |
| Answer» C. Transistors | |