# Positive logic in a logic circuit is one in which

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Positive logic in a logic circuit is one in which logic 0 voltage level is lower than logic 1 voltage level.

## Related questions

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

Logic state 0 in positive logic corresponds to   1. zero voltage 2. positive voltage 3.higher voltage level 4. lower voltage level

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

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

Out of the followings, which one is correct in case of a circuit breaker? (1) Making capacity = 2.55 X braking capacity (2) Braking capacity = 2.55 X making capacity (3) Making capacity = 1.8 X braking capacity (4) Braking capacity = 1.8 X making capacity

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

Which of the following circuits come under the class of sequential logic circuits ?   P. Full adder   Q. Full subtractor   R. Half adder   S. JK flip   T. Counter   Select the correct answer from the codes given below: (a) P and Q (b) Q and R (c) R and S (d) S and T

Which of the following gates can be used to realize all possible combinational logic functions?  (i) OR gate (ii) NOR gate (iii) Exclusive OR gate (iv) NAND gate (v) AND gate  (A) (iii), (iv) and (v)  (B) (i), (iii) and (iv)  (C) (ii) and (iv)  (D) (i) and (v)

Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

In a series RLC circuit, which one does not change with change in input frequency ? (A) Bandwidth (B) Quality factor (C) Resonant frequency (D) All of them

What is not true in the context of “Don’t Care Condition” in digital logic ? (A) It corresponds to combination of logic variables whose value is not defined (B) It can be assumed to be 0 or 1 (C) It can be assumed to be 1 only (D) It helps in simplification of logic function

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

Which one is not a correct type of circuit breaker: A. Over Head circuit breaker B. Miniature Circuit Breaker C. Earth Leakage Circuit Breaker D. Oil Circuit Breaker

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

One sine wave has a positive - going zero crossing at 15° and another sine wave has a positive - going zero crossing at 55°. The angle between the two waveforms is -  a) 0° b) 45° c) 40° d) None of the above

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

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

In a step-up or step-down transformer, electrical power is transferred from one circuit to another without change in

In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in (A) voltage notching (B) harmonic distortion (C) voltage sag (D) voltage swell

If one of the control springs of PMMC ammeter is broken when it is connected in a circuit, the meter will read  A) Half the correct value of current B) Twice the correct value of current C) An indefinite figure D) Zero

The power in a 3phase circuit is measured with the help of 2 wattmeters. The reading of one of wattmeters is positive and that of the others is negative. The magnitude of readings is different. It can be concluded that the power factor of the circuit is  (A) Unity (B) 2 (lagging) (C) 5 (lagging) (D) Less than 0.5 (lagging)

The multivibrator circuit which processes one stable state and one quasi stable is   (a) Astabel (b) Monostable (c) Bistable (d) Schmitt trigger circuit

A 3-phase voltage source inverter is operated in 180o conduction mode. Which one of the following statements is true ?  (A) Both pole-voltage and line-voltage will have 3rd harmonic components (B) Pole-voltage will have 3rd harmonic component but line-voltage will be free from 3rd harmonic (C) Line-voltage will have 3rd harmonic component but pole-voltage will be free from 3rd harmonic (D) Both pole-voltage and line-voltage will be free from 3rd harmonic components

Which one of the following is not a transducer in the true sense?   (A) Thermocouple (B) Piezoelectric pick-up (C) Photo voltaic cell (D) LCD.

____ is known as a computer network in which one centralized, powerful computer is a hub to which many less powerful personal computers or workstations are connected. The clients run programs and access data that stored on the server.  a) Client-Server network b) Extranet c) Internet d) None of the above.

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

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

Which of the following has got a positive susceptibility  1.Diamagnetic 2.Paramagnetic 3.Ferromagnetic 4.both Paramagnetic & ferromagnetic

Which of the following describes the operation of a positive edge - triggered D -type flip-flop? a) if both inputs are HIGH, the output will toggle b) the output will follow the input on the leading edge of the clock c) - when both inputs are LOW, an invalid state exists d) the input is toggled into the flip-flop on the leading edge of the clock and is passed to the output on the trailing edge of the clock.

State the function of a contactor in a power circuit of locomotive. List different types of it and state one application of each.

In a fullwave rectifier circuit with centre tap transformer, if voltage between one end of secondary winding and centre tap is 300V peak, then PIV (peak inverse voltage) is a. 300 V b. 150 V c. 600 V 5 d. 900 V

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

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

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

Which of the following voltage is used represent binary '1' in digital circuits .   1.0 V 2. 15 V 3. +5 V 4. 25 V

Which of the following function is useful in system requiring error detection and correction codes ? (A) AND-OR (B) OR (C) AND (D) Exclusive -OR

Which side of the diode is positive?

Which is the positive terminal anode or cathode?

A switch tail ring counter is made by using a single D-FF. The resulting circuit is (A) T-FF (B) D-FF (C) SR-FF (D) JK-FF

In a Bode magnitude plot, which one of the following slopes would be exhibited at high frequencies by a 4th order all-pole system? (A) – 80 dB/decade (B) – 40 dB/decade (C) +40 dB/decade (D) +80 dB/decade