# Read the following statements: i. Gate is a combinational logic. ii. JK Flip-flop in toggle mode is not

14 views

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

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

## Related questions

In a JK flip-flop, for what input next state is complement of the present state (A)J=0,K=0 (B)J=1,K=0 (C)J=0,K=1 (D)J=1,K=1

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

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

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

By which of the following connections, one-bit binary counter can be obtained from a JK flip-flop?  A) J = K = 0 B) J = K = 1 C) J = K’ D) None of these

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)

Which of the following flip-flop do not have race problem ? a)T flip-flop b) D flip-flop c) JK flip-flop d) Master Slave flip-flop

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

A basic S -R flip-flop can be constructed by cross -coupling which basic logic gates : - a) AND or OR gates b) XOR or XNOR gates c) NOR or NAND gates d) AND or NOR gates

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

Draw logic diagram of T flip-flop and give its truth table.

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.

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

Define flip-flop.

The following statements are made for FETs 1. In n -channel depletion mode MOS in the active region, the control voltage VGS is negative. 2. NMOS in depletion mode is cut off for VGS=O 3. NMOS in enhance mode is cut off for VGS=O 4. There is no path between source and drain in the enhancement mode Of these, the true statements are : a. 1 and 2 only b. 1 and 3 only c. 3 and 4 only d. 1, 3 and 4 only

Which of the following statements is not valid in case of conductors in electrostatic fields? A) The static electric field intensity inside a conductor is zero B) The static electric field intensity at the surface of a conductor is everywhere directed normal to the surface C) The conductor surface is an equivalent potential surface D) None of the above

Each flip-flop in a 4-bit ripple counter introduces a maximum delay of 40 n sec. The maximum clock frequency is (a) 2.65 MHz (b) 6.25 MHz (c) 5.26 MHz (d) 6.52 MHz

In an unclocked R-S flip flop made of NOR gates, the forbidden input condition is:  (1) R=0, S=0 (2) R=1, S=0 (3) R=0, S=1 (4) R=1, S=1

One out of the following statements is not true: A) The curl of gradient of any scalar field is identically zero B) The divergence of curl of any vector field is identically zero C) A field, which has zero divergence, is said to be solenoidal D) A field, whose curl is zero, is said to be rotational

Which of the following statements is not characteristic of a static magnetic field? (A) It is solenoidal. (B) It is conservative. (C) It has no sinks or sources. (D) Flux lines are always closed.

Suggest the energy conservation techniques in following cases : (i) Motor is running with 70% loaded condition. (ii) Motor is continuously loaded at 50%. (iii) Motor runs with 30% loaded condition but sometimes rises to 50% loading condition. (iv) Motor runs continuously under no-load condition.

A J -K flip-flop with J= 1 and K= 1 has a 20 kHz clock input. The Q output is : (A) Constant and low (B) Constant and high (C) A square wave with 20 kHz frequency (D) A square wave with 10 kHz frequency

A UPS commonly has following parts : (i) rectifier (ii) inverter (iii) static switch Which of the following is true ?   (a) only (i) (b) only (i) and (ii) (c) (i), (ii) and (iii) (d) only (ii) and (iii)

Explain the following energy conservation techniques: (i) By reducing I2R losses in Trans. system (ii) By optimizing distribution voltage.

With the help of neat diagrams,explain the following methods of speed control in DC series motor. i) Field diverter method. ii) Armature diverter method.

State the function and shape of following parts used in induction type energy meter: i) Series magnet ii) Shunt magnet iii) Al disc iv) Brake magnet

State the function of following auxiliaries used in electric locomotive, i) Batteries ii ) Compressor iii ) Blower iv ) Exhauster

On a master slave flip-flop, master is enabled : (A) When gate is low (B) When gate is high (C) When gate is either low or high (D) None of the above

Which of the following statements is not correct ? (A) A primary cell is an electro-chemical cell (B) After charging, a primary cell can be again put to use (C) Dry cell is a primary cell (D) Leclanche cell is used in experiments, where constant supply of current is not needed

State the function of following components of a nuclear power station: i) Moderator ii) Shielding iii) Control rod iv) Coolant

Consider the following systems : (i) a normal human being walking on the road, and (ii) servomechanism. Systems (i) and (ii) are, respectively, (A) Open loop control system, Open loop control system. (B) Closed loop control system, Closed loop control system. (C) Open loop control system, Closed loop control system. (D) Closed loop control system, Open loop control system.

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

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 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

State function of preset and clear in flip flop.

What is the propagation delay of a logic gate?

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Write how energy can be stored or generated in each of following : i) solar cell ii) geothermal energy iii) hydrogen energy in biomass.

When a dominant mode wave guide not terminated in its characteristic impedance is excited with a 10 GHZ signal then if d is the distance between two successive minima of the standing wave in the guide then   (A) d = 1.5 cm (B) d is less then 1.5 cm (C) d is greater then 1.5 cm (D) d = 3 cm

Fill in the blank(s) with the appropriate word(s)  i. A MOSFET operates in the ________________ mode when vGS < vGS(th)  ii. In the ohmic region of operation of a MOSFET vGS - vGS (th) is greater than ________________.  iii. rDS (ON) of a MOSFET ________________ with increasing vGS.  iv. In the active ... th) is almost ________________ in the active mode of operation.  ix. The safe operating area of a MOSFET is restricted on the left hand side by the ________________ limit.

A 3 -stage ripple counter has Flip Flop with propagation delay of 25 nsec and pulse width of strobe input 10 nsec. Then the maximum operating frequency at which counter operates reliably is

To convert a S-R flip-flop to D flip-flop (a) D input is given to S and D input to clock (b) D input is given to S and D to R (c) D input is given to clock and D to S input (d) D input to S and clock to R

Consider the following statements :  1. Network theorems are not derivable from Kirchhoff's law.  2. To get the . Norton current, one has to short the current source.  3. Thevenin's theorem is suitable for a circuit involving voltage sources and series connections.  Which of the above statements is/are correct ?  (a) 1, 2 and 3 (b) 1 only (c) 2 only (d) 3 only