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Q1. | A full adder is to be implemented using half adders and OR gates. A 4 bit parallel adder without any initial carry requires |

A. | 8 half adders and 4 OR gates [Wrong Answer] |

B. | 8 half adders and 3 OR gates [Wrong Answer] |

C. | 7 half adders and 3 OR gates [Correct Answer] |

D. | 7 half adders and 4 OR gates [Wrong Answer] |

View Answer
Explanation:-
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**Also Read Similar Questions Below :**

⇒ Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is

average of the time constants of individual coils

sum of the time constants of the individual coils

geometric mean of the time constants of individual coils

product of the time constants of the individual coils

⇒ In a proportional plus integral control action

proportional gain K

*is adjustable but integral time T*

_{p}*is constant*

_{i}proportional gain K

*is adjustable but integral time T*

_{p}*is adjustable*

_{i}both proportional gain K

*and integral time T*

_{p}*are adjustable*

_{i}both proportional gain K

*and integral time T*

_{p}*are constant*

_{i}⇒

**Assertion (A):** Microprocessor 8085 has facility of interrupt control.

**Reason (R):** TRAP, RST 7.5, RST 6.5, RST 5.5 and 1NTR are interrupt signals in 8085.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct R is wrong

A is wrong R is correct

⇒ The number of memory locations in which 14 address bits can access is

1024

2048

4096

16384

⇒ The function

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*x*-

*v*

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A stationary wave

A wave motion in forward direction

A wave motion in reverse direction

None of the above

⇒

**Assertion (A):** The colour signal consists of only luminance signal

**Reason (R):** In India PAL colour signal system is used.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒ Two thyristor of same rating and same specifications

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will have equal turn on but unequal turn off periods

may have equal or unequal turn on and turn off periods

will have unequal turn on and turn off periods

⇒ Which one of the following is true?

Characteristic impedance of twin wire feeder and coaxial cable are nearly the. same

The characteristic impedance of coaxial cable is more than that of twin wire cable

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The characteristic impedance of a twin wire feeder may be more or less than that of coaxial cable

⇒ The transfer function of a discrete time LTI system is give

Both S1 and S2 are true

Both S2 and S3 are true

Both S1 and S3 are true

S1, S2 and S3 are all true

⇒ The speed at which axial electric field due to signal advances in a TWT is equal to

speed of light

(speed of light) (helix pitch helix circumference)

(speed of light) (helix circumference helix pitch)

(speed of light) (helix pitch) (helix circumference)

⇒ Which of the following is not a wideband antenna?

Marconi

Discone

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⇒ The log magnitude curve for a constant gain K is a

horizontal straight line

horizontal straight line of magnitude 20 log K decibels

an inclined line having slope K

an inclined line having slope -K

⇒ In the field controlled motor the entire damping comes from

armature resistance

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motor friction and load

field resistance

⇒ The resonance frequency is

ω

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ω

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ω

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ω

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⇒ Many circles are drawn in a Smith chart used for transmission line calculations. The circle shown in the figure represe

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constant resistance circles

constant reactance circles

constant reflection coefficient circles

⇒ Which of the following rotors are used in two phase ac servomotor?

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- Squirrel cage rotor
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2, 3

1, 3

⇒ A computer program is used to read N and print the sum 1

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100

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385

285

⇒ An AC circuit has two branches in parallel. The current in one branch is 5 A. Then the current source

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0.208333333333333

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⇒ The range of visible light is

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⇒ If the radiated power of AM transmitter is 10 kW, the power in the carrier for modulation index of 0.6 is nearly.

8.24 kW

8.47 kW

9.26 kW

9.6 kW

⇒ The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X results in a binary number without overflow. This implies that the result is

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+ve and is in normal form

+ve and in 2's complement

⇒ The following circuit diagram resembl

logic 0

logic 1

*f*(A, B, C) = Σ

*m*(0, 1, 4, 6, 7)

none

⇒ The sensor generally used in incremental optical encoder is

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LCD

photodiode

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pocket calculators

electronic counter

digital voltmeters

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⇒ Which one of the following is D/A conversion technique?

Successive approximation

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a sequential circuit with flip-flops and gates

none of the above

⇒ In a specimen of ferromagnetic material, as the flux density is increased from zero to 2.5 T, µ

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first decrease then increase

first increase then decrease