Description : How many address bits are required to represent a 32 K memory (A) 10 bits. (B) 12 bits. (C) 14 bits. (D) 16 bits.
Last Answer : (D) 16 bits.
Description : Words having 8-bits are to be stored into computer memory. The number of lines required for writing into memory are (A) 1. (B) 2. (C) 4. (D) 8.
Last Answer : Ans: D Because 8-bit words required 8 bit data lines.
Description : Which of the following memories stores the most number of bits (A) a 5M×8 memory. (B) a 1M × 16 memory. (C) a 5M × 4 memory. (D) a 1M ×12 memory.
Last Answer : Ans: A 5Mx8 = 5 x 220 x 8 = 40M (max)
Description : A weighted resistor digital to analog converter using N bits requires a total of (A) N precision resistors. (B) 2N precision resistors. (C) N + 1 precision resistors. (D) N – 1 precision resistors.
Last Answer : (A) N precision resistors.
Description : In successive-approximation A/D converter, offset voltage equal to 1/2 LSB is added to the D/A converter's output. This is done to (A) Improve the speed of operation. (B) Reduce the maximum ... Increase the number of bits at the output. (D) Increase the range of input voltage that can be converted
Last Answer : (B) Reduce the maximum quantization error.
Description : The A/D converter whose conversion time is independent of the number of bits is (A) Dual slope (B) Counter type (C) Parallel conversion (D) Successive approximation.
Last Answer : Ans: C The A/D converter whose conversion time is independent of the Number of bits is Parallel conversion. (This type uses an array of comparators connected in parallel and comparators compare the input voltage at a particular ratio of the reference voltage).
Description : Which numbering format is used to represent both numbers and letters on a keyboard? 79) A) octal B) ASCII C) hexadecimal D) BCD
Last Answer : B) ASCII
Description : How many flip-flops are required to construct mod 30 counter (A) 5 (B) 6 (C) 4 (D) 8
Last Answer : (A) 5
Description : How many flip flops are required to construct a decade counter (A) 10 (B) 3 (C) 4 (D) 2
Last Answer : Ans: C Decade counter counts 10 states from 0 to 9 ( i.e. from 0000 to 1001 ) Thus four FlipFlop's are required.
Description : Which of the memory is volatile memory (A) ROM (B) RAM (C) PROM (D) EEPROM
Last Answer : Ans: B RAM is a volatile memory (Volatile memory means the contents of the RAM get erased as soon as the power goes off.)
Description : How many AND gates are required to realize Y = CD+EF+G (A) 4 (B) 5 (C) 3 (D) 2
Last Answer : 2
Description : How many Flip-Flops are required for mod–16 counter? (A) 5 (B) 6 (C) 3 (D) 4
Last Answer : (D) 4
Description : A memory management system has 64 pages with 512 bytes page size. Physical memory consists of 32 page frames. Number of bits required in logical and physical address are respectively: (1) 14 and 15 (2) 14 and 29 (3) 15 and 14 (4) 16 and 32
Last Answer : (3) 15 and 14
Description : How many two input AND gates and two input OR gates are required to realize Y = BD+CE+AB (A) 1, 1 (B) 4, 2 (C) 3, 2 (D) 2, 3
Last Answer : Ans: A There are three product terms, so three AND gates of two inputs are required. As only two input OR gates are available, so two OR gates are required to get the logical sum of three product terms.
Description : How many two-input AND and OR gates are required to realize Y=CD+EF+G (A) 2,2. (B) 2,3. (C) 3,3. (D) none of these.
Last Answer : Ans: A Y=CD+EF+G Number of two input AND gates=2 Number of two input OR gates = 2 One OR gate to OR CD and EF and next to OR of G & output of first OR gate.
Description : A 4-bit synchronous counter uses flip-flops with propagation delay times of 15 ns each. The maximum possible time required for change of state will be (A) 15 ns. (B) 30 ns. (C) 45 ns. (D) 60 ns.
Last Answer : Ans: A 15 ns because in synchronous counter all the flip-flops change state at the same time.
Description : The gates required to build a half adder are (A) EX-OR gate and NOR gate (B) EX-OR gate and OR gate (C) EX-OR gate and AND gate (D) Four NAND gates.
Last Answer : (C) EX-OR gate and AND gate
Description : If the input to T-flipflop is 100 Hz signal, the final output of the three T-flipflops in cascade is (A) 1000 Hz (B) 500 Hz (C) 333 Hz (D) 12.5 Hz.
Last Answer : (D) 12.5 Hz.
Description : Convert decimal 12 to octal. 75) A) 168 B) 128 C) 108 D) 148
Last Answer : D) 148
Description : Convert octal 12 to binary. 17) A) 010001 B) 001111 C) 001010 D) 001100
Last Answer : C) 001010
Description : Convert the decimal number 12.125 to binary. 12) A) 1100.0110 B) 1110.0010 C) 1100.0010 D) 1010.1100
Last Answer : C) 1100.0010
Description : How many select lines will a 32:1 multiplexer will have (A) 5. (B) 8. (C) 9. (D) 11.
Last Answer : (A) 5.
Description : The number of control lines for a 8 – to – 1 multiplexer is (A) 2 (B) 3 (C) 4 (D) 5
Last Answer : Ans: B The number of control lines for an 8 to 1 Multiplexer is 3 (The control signals are used to steer any one of the 8 inputs to the output)
Description : For a memory with a 16-bit address space, the addressability is a. 16 bits b. 8 bits c. 2^16 bits d. Cannot be determined
Last Answer : d. Cannot be determined
Description : Usually, it takes10-bits to represent one character. How many characters can betransmittedat a speed of 1200 BPS? A. 10 B. 12 C. 120 D. 1200 E. None of the above
Last Answer : 120
Description : What is the decimal value of 2-3? 74) A) 0.25 B) 0.75 C) 0.125 D) 0.8
Last Answer : C) 0.125
Description : What numeric symbols are used in the binary number system? 58) A) 0 through 8 B) 0, 1, 2 C) 1, 2 D) 0, 1
Last Answer : D) 0, 1
Description : What is the decimal value of 23? 27) A) 4 B) 8 C) 2 D) 6
Last Answer : A) 00010000
Description : The decimal equivalent of binary 1010000 is ________. 8) A) 9610 B) 8010 C) 7810 D) 8410
Last Answer : A) 9610
Description : The commercially available 8-input multiplexer integrated circuit in the TTL family is (A) 7495. (B) 74153. (C) 74154. (D) 74151.
Last Answer : Ans: B MUX integrated circuit in TTL is 74153.
Description : 1’s complement representation of decimal number of -17 by using 8 bit representation is (A) 1110 1110 (B) 1101 1101 (C) 1100 1100 (D) 0001 0001
Last Answer : (A) 1110 1110
Description : -8 is equal to signed binary number (A) 10001000 (B) 00001000 (C) 10000000 (D) 11000000
Last Answer : (A) 10001000
Description : Convert the decimal number 10.5 to binary. 92) A) 1100.1000 B) 1010.0101 C) 1010.1000 D) 1011.1000
Last Answer : C) 1010.1000
Description : A ring counter consisting of five Flip-Flops will have (A) 5 states (B) 10 states (C) 32 states (D) Infinite states.
Last Answer : Ans: A A ring counter consisting of Five Flip-Flops will have 5 states.
Description : The binary equivalent of hexadecimal 10 is ________. 112) A) 00010000 B) 00110 C) 1010 D) 11000
Description : Convert octal 10 to decimal. 64) A) 1210 B) 210 C) 810 D) 1610
Last Answer : C) 810
Description : What is the decimal value of 25? 38) A) 10 B) 20 C) 16 D) 32
Last Answer : D) 32
Description : Convert the binary number 0000.1010 to decimal. 6) A) 0.10 B) 0.55 C) 0.50 D) 0.625
Last Answer : D) 0.625
Description : The number of flip flops contained in IC 7490 is (A) 2. (B) 3. (C) 4. (D) 10.
Last Answer : (A) 2.
Description : The NOR gate output will be low if the two inputs are (A) 00 (B) 01 (C) 10 (D) 11
Last Answer : A
Description : The NAND gate output will be low if the two inputs are (A) 00 (B) 01 (C) 10 (D) 11
Last Answer : (D) 11
Description : How many bits are required to represent one nibble ?
Last Answer : 4-bits are required to represent one nibble.
Description : Minimum number of bits required to represent maximum value of given analogue signal with 0.1% accuracy is: a. 8 bits b. 9 bits c. 10 bits d. 12 bits
Last Answer : 10
Description : What is the decimal value of 2-1? 33) A) 0.1 B) 0.25 C) 0.5 D) 0.05
Last Answer : C) 0.5
Description : What is the decimal value of 2-2? 11) A) 0.5 B) 0.125 C) 0.2 D) 0.25
Last Answer : D) 0.25
Description : Convert octal 54 to decimal. 5) A) 6410 B) 5810 C) 7610 D) 4410
Last Answer : D) 4410
Description : The logic 0 level of a CMOS logic device is approximately (A) 1.2 volts (B) 0.4 volts (C) 5 volts (D) 0 volts
Last Answer : Ans: D CMOS logic low level is 0 volts approx.
Description : The number of control lines for 32 to 1 multiplexer is (A) 4. (B) 5. (C) 16. (D) 6.
Last Answer : Ans: B The number of control lines for 32 (2^5) and to select one input among them total 5 select lines are required.
Description : The number of control lines for 16 to 1 multiplexer is (A) 2. (B) 4. (C) 3. (D) 5.
Last Answer : (B) 4.