Recent questions and answers in Digital Electronics

0 answers 34 views

 Can we create a digital circuit that has as inputs the  3- bit digital words [2: 0] A, [2: 0] B and [2: 0] C and its output is  equal to      |C-A-B| . The circuit of the binary full adder is known.

asked Aug 11, 2018 in Digital Electronics
1 answer 25 views

The output of a JK flip-flop with asynchronous preset and clear inputs is ‘1’. The output can be changed to ‘0’ with one of the following conditions by applying A) J = 0, K = 0 and using a clock B) J = 1, K = 0 and using the clock C) Asynchronous preset input D) J = 1, K = 1 and using the clock 

answered Jun 17, 2018 in Digital Electronics
1 answer 41 views

Which one of the following logic circuit has the highest speed as compared to the currently available logic circuits? A) Resistance-transistor logic B) Emitter-coupled logic C) Integrated-injection logic D) Diode-transistor logic 

answered Jun 17, 2018 in Digital Electronics
1 answer 76 views

What is the 2's complement of 01101? A) 10010 B) 10011 C) 1100 D) 1001 

answered Jun 17, 2018 in Digital Electronics
1 answer 14 views

The current mode logic (CML) is same as A) LSI B) CMOS C) TTL D) ECL

answered Jun 17, 2018 in Digital Electronics
1 answer 8 views

Which code is used in constructing k-maps?  A) Hamming code B) 2 out of 5 code C) BCD code D) Gray code 

answered Jun 17, 2018 in Digital Electronics
1 answer 10 views

 For a NAND gate, when one or more inputs are low then the output will be A) Low B) High C) Alternately high and low D) High or low depending on relative magnitude of inputs 

answered Jun 17, 2018 in Digital Electronics
1 answer 14 views

 Decimal equivalent of Hexadecimal number (C3B1)16 is: A) 12197 B) 32097 C) 52097 D) 50097

answered Jun 17, 2018 in Digital Electronics
0 answers 17 views

The IC used for 2:1 multiplexer is (A) IC 74150 (B) IC 74151 (C) IC 74153 (D) IC 74157 

asked Jun 4, 2018 in Digital Electronics
0 answers 14 views

A bi-stable multi-vibrator can be built by using (A) NAND gates (B) AND gates (C) AND or OR gates (D) Excusive-NOR gates 

asked Jun 4, 2018 in Digital Electronics
1 answer 12 views

A NOR gate is equivalent to a bubbled AND gate. This statement is an outcome of: (1) De Morgan’s Law (2) Involution Law (3) Law of Absorption (4) Idempotent Law

answered May 29, 2018 in Digital Electronics
1 answer 7 views

Initially the number decimal 8 is stored. If instruction RAL is executed twice, the final number stored will be: (1) Decimals 8 (2) Decimal 16 (3) Decimal 32 (4) Decimal 2 

answered May 28, 2018 in Digital Electronics
1 answer 26 views

Determine the output frequency for a frequency division circuit that contains 12 flip–flops with an input clock frequency of 20.48 MHz: (1) 10.24 kHz (2) 5 kHz (3) 30.24 kHz (4) 15 kHz 

answered May 28, 2018 in Digital Electronics
1 answer 12 views

The output of an exclusive–NOR gate is 1. Which input combination is correct? (1) A = 1, B = 0 (2) A = 0, B = 1 (3) A = 0, B = 0 (4) None of these 

answered May 28, 2018 in Digital Electronics
1 answer 16 views

In a positive edge triggered JK flip-flop, J = 1, K = 0 and clock pulse is rising, Q will be (a) 0 (b) 1 (c) showing no change (d) toggle 

answered May 26, 2018 in Digital Electronics
1 answer 15 views

How many flip-flops are required to build a binary counter circuit to count from 0 to 1023 ? (a) 1 (b) 6 (c) 10 (d) 23 

answered May 26, 2018 in Digital Electronics
1 answer 8 views

How many minimum number of NOR gates are required to realize a two-input X-OR gate?

answered May 25, 2018 in Digital Electronics
1 answer 8 views

Output of NAND gate is 0. for three inputs when:

answered May 24, 2018 in Digital Electronics
1 answer 7 views

In a PLL, lock occurs when the (A) input frequency and the VCO frequency are the same (B) Phase error is 1800 (C) VCO frequency is double the input frequency (D) Phase error is 900

answered May 24, 2018 in Digital Electronics
1 answer 9 views

The following logic families have their propagation delay. Arrange them from lowest propagation delay to highest propagation delay. 1. TTL (Standard) 2. ECL 3. Low power CMOS 4. DTL (A) 2, 1, 4 and 3 (B) 2, 4, 1 and 3 (C) 4, 2, 3 and 1 (D) 1, 2, 3 and 4

answered May 24, 2018 in Digital Electronics
1 answer 6 views

In successive approximation converter input to the comparator is through (A) DAC (B) Latch (C) Flip-flop (D) Sample and hold circuit

answered May 24, 2018 in Digital Electronics
1 answer 14 views

Read the following statements: i. Gate is a combinational logic. ii. JK Flip-flop in toggle mode is not combinational logic. iii. MSJK Flip-flop suffers from race-around. iv. Counters are sequential circuits. Which choice is correct? (A) i, ii (B) i, ii, iv (C) ii, iii, iv (D) i, ii, iii

answered May 24, 2018 in Digital Electronics
1 answer 13 views

Which of the following peripherals provide I/O facilities? i. 8279 ii. 8155 iii. 8259 iv. 8255 (A) i, ii (B) ii, iii (C) iii, iv (D) ii, iv

answered May 24, 2018 in Digital Electronics
1 answer 39 views

In standard TTL gates, the totem pole output stage is primarily used to (A) increase the noise margin of the gate (B) decrease the output switching delay (C) facilitate a wired OR logic connection (D) increase the output impedance of the circuit

answered May 24, 2018 in Digital Electronics
1 answer 13 views

Which of the following is error correcting code? (A) EBCDIC (B) GRAY (C) Hamming (D) ASCII

answered May 24, 2018 in Digital Electronics
1 answer 11 views

The number of switching functions of 3 variables is (A) 8 (B) 64 (C) 128 (D) 256

answered May 24, 2018 in Digital Electronics
0 answers 18 views

The decimal equivalent of the hexadecimal number E5 is  (a) 279 (b) 229 (c) 427 (d) 3000

asked May 23, 2018 in Digital Electronics
0 answers 14 views

No. of flip-flops used in decade counter (a) 3 (b) 2 (c) 4 (d) None of these

asked May 23, 2018 in Digital Electronics
0 answers 115 views

How is a J-K Flip Flop made to toggle  (a) J=0, K=0 (b) J=1, K=0 (c) J=0, K=1 (d) J=1, K=1 

asked May 23, 2018 in Digital Electronics
1 answer 15 views

A half adder can be constructed from

answered May 23, 2018 in Digital Electronics
1 answer 12 views

The decimal equivalent of a Hexadecimal no. (F8E6)16 is 

answered May 23, 2018 in Digital Electronics
1 answer 10 views

Hexadecimal equivalent of the decimal number 25610 is

answered May 23, 2018 in Digital Electronics
1 answer 135 views

The frequency of the clock signal applied to the rising edge triggered D flip-flop shown in figure is 10 KHZ. The frequency of the signal at Q is A) 10 KHz B) 2.5 KHz C) 20 KHz D) 5 KHz

answered May 20, 2018 in Digital Electronics
1 answer 10 views

For the circuit shown in figure, the Boolean expression for the output y in terms of inputs P, Q, R and S is

answered May 20, 2018 in Digital Electronics
1 answer 17 views

If the contents of an accumulator are Ex-ORed with itself and placed in the accumulator itself, then  A) Carry flag will be set B) The accumulator contains all 1’s C) The zero flag is set D) The accumulator contents are shifted left by one bit

answered May 20, 2018 in Digital Electronics
1 answer 392 views

The number of comparators required in a 3-bit comparator type analog to digital converter is  A) 2 B) 3 C) 7 D) 8 

answered May 20, 2018 in Digital Electronics
1 answer 30 views

The Octal equivalent of HEX and number AB.CD is  (A) 253.314 (B) 253.632 (C) 526.314 (D) 526.632

answered May 18, 2018 in Digital Electronics
1 answer 19 views

The complete set of only those Logic Gates designated as Universal Gates is  (A) NOT, OR and AND Gates (B) XNOR, NOR and NAND Gates (C) NOR and NAND Gates (D) XOR, NOR and NAND Gates

answered May 18, 2018 in Digital Electronics
1 answer 23 views

The output Y of a 2-bit comparator is logic 1 whenever the 2-bit input A is greater than the 2-bit input B. The number of combinations for which the output is logic 1, is  (A) 4 (B) 6 (C) 8 (D) 10

answered May 18, 2018 in Digital Electronics
1 answer 13 views

A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned ON and also can be turned OFF by any one of the switches irrespective of the state of the other switch. The logic of switching of the bulb resembles  (A) and AND gate (B) an OR gate (C) an XOR gate (D) a NAND gate

answered May 18, 2018 in Digital Electronics
1 answer 12 views

Boolean algebra is based on  (A) numbers (B) logic (C) truth (D) symbols 

answered May 17, 2018 in Digital Electronics
1 answer 9 views

 When A = 0., B = 0, C = 1 then in two input logic gate we get gate  (A) XOR gate (B) AND gate (C) NAND gate (D) NOR gate

answered May 17, 2018 in Digital Electronics
1 answer 9 views

Register and counters are similar in the sense that they both   (A) count pulses (B) store binary operation (C) shift operation (D) made from an array of flip flops and gates integrated on a single chip

answered May 17, 2018 in Digital Electronics
1 answer 10 views

Registers in which data is entered or taken out in serial form are referred as   (A) left shift register (B) right shift register (C) shift registers (D) none of the above

answered May 17, 2018 in Digital Electronics
1 answer 5 views

IC which has quad 2 input AND gates   (A) 7411 (B) 7404 (C)7400 (D) 7408

answered May 17, 2018 in Digital Electronics
1 answer 17 views

In the 8421 BCD code the decimal number 125 is written as   (A) 1111101 (B) 0001 0010 0101 (C) 7D (D) None of the bove

answered May 17, 2018 in Digital Electronics
1 answer 15 views

8 in decimal system is equal to ____ in binary system

answered May 15, 2018 in Digital Electronics
1 answer 8 views

A 4 bit counter is used to count from 0,1,2...n. Value of “n” is

answered May 14, 2018 in Digital Electronics
1 answer 5 views

Successive approximation technique is used for

answered May 14, 2018 in Digital Electronics
1 answer 21 views

The gate whose output is LOW, if and only if all the inputs are HIGH, is

answered May 14, 2018 in Digital Electronics
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