Question is ⇒ A full adder is to be implemented using half adders and OR gates. A 4 bit parallel adder without any initial carry requires, Options are ⇒ (A) 8 half adders and 4 OR gates, (B) 8 half adders and 3 OR gates, (C) 7 half adders and 3 OR gates, (D) 7 half adders and 4 OR gates, (E) , Leave your comments or Download question paper.

Question is ⇒ A full adder is to be implemented using half adders and OR gates. A 4 bit parallel adder without any initial carry requires, Options are ⇒ (A) 8 half adders and 4 OR gates, (B) 8 half adders and 3 OR gates, (C) 7 half adders and 3 OR gates, (D) 7 half adders and 4 OR gates, (E) , Leave your comments or Download question paper. Previous question Next question


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 1 -1 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ If the p and T circuits in figure are equivalent, then R₁, R₂, R₃ respectively
9 Ω, 6 Ω, 6 Ω
6 Ω, 6 Ω, 9 Ω
9 Ω, 6 Ω, 9 Ω
6 Ω, 9 Ω, 6 Ω

⇒ In a bridge inverter with single pulse width modulation
the output frequency is equal to frequency of reference signal
the output frequency is equal to frequency of control signal
either (a) or (b)
neither (a) nor (b)

⇒

Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.

Reason (R): Thermionic emission current ∝ T² e^-Ew/kT.

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

⇒ Three capacitors each 9 μF are connected in delta. The value of each capacitor in equivalent star connection is
3 μF
6 μF
27 μF
81 μF

⇒ Leak type bias is used in plate modulated class C amplifier to
increase the bandwidth
prevent over modulation
prevent excessive grid current
prevent tuned circuit damping

⇒ The oscillator shown in figure
Colpitt's oscillator
Hartley oscillator
Tuned emitter oscillator
Clapp oscillator

⇒ Which of the following statements is/are true for a good conductor of electricity?

Its conductivity decreases with increasing temperature.
Number of free electrons is around 10²⁸ m^-3.
Its conductivity decreases with addition of impurities.
It is a good conductor of heat also.

1, 2, 3 and 4
1 only
2 and 3 only
3 and 4 only

⇒ If any term in the first column of a Routh array becomes zero, then
Routh criterion cannot be used to determine stability
Routh criterion can be used by substituting a small positive number for zero and completing the array
Routh criterion can be used by substituting a big positive number for zero and completing the array
Routh criterion can be used by substituting a small negative number for zero and completing the array

⇒ In active filters inductances are divided because they
are always associated with same resistance
are bulky and unsuitable for miniaturization
are non linear
saturate quickly

⇒ The no. of comparators required in a 3 bit comparator type ADC is
2
3
7
8

⇒ For BJT, under saturation condition
I_C = βI_B
I_C > bI_B
I_C is independent of all other parameters
I_C < βI_B

⇒ The polarities of the magnetised iron rod of
A is N, B is S and C is neutral
A is N, B is S and C is S
A is N, B is N and C is S
A is S, N is S and C is N

⇒ In a TV studio the illuminance is about
200 lux
1000 lux
10000 lux
10 lux

⇒ Resistivity of semiconductors is around 100 Ω-m.
TRUE
FALSE

⇒

Assertion (A): The velocity factor of a line is the ratio of wave velocity on the line to speed of light.

Reason (R): If the conductors of a line are immersed in a non magnetic insulating liquid, the wave velocity increases.

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

⇒ As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is
14.85
220
78
3.85

⇒ In a television transmitter, the output stage is most likely to be
screen modulated class C amplifier
plate modulated class C amplifier
grid modulated class A amplifier
grid modulated class C amplifier

⇒ In a transistor operating in forward active mode
depletion layer between emitter and base is thin and that between base and collector is also thin
both depletion regions are thick
depletion layer between emitter and base is thin and that between base and collector is thick
depletion layer between emitter and base is thick and that between base and collector is thin

⇒ When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power
remains the same
increases by 25%
increases by 33.3%
increases by 50%

⇒ In an ac circuit that delivers constant power at varying p.f., the current is
lowest when p.f. is leading
lowest when p.f. is lagging
lowest when p.f is unity
the same for all power factors

⇒ A dc chopper is feeding an RLE load. The condition for maximum ripple is
a = 1
a = 0.8
a = 0.5
a < 0.5

⇒

Assertion (A): Laplace transform of impulse function is equal to area under the impulse.

Reason (R): An impulse function whose area is unity is called unit impulse function.

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
R is correct but A is wrong

⇒ If antenna diameter is increased four times, the maximum range is increased by a factor of
2
2
4
0.2

⇒ A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to
decrease the firing angle
increase the firing angle
either decrease or increase the firing angle depending on the required speed
decrease the load torque

⇒

Assertion (A): In circular waveguide the attenuation of TE₀₁ mode decreases as the operating frequency increases.

Reason (R): The wall currents in a circular waveguide in TE_Q1 mode are completely circumferential.

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

⇒ When energy is fed into open wire transmission line the energy may get dissipated due to
radiation
conductor heating
dielectric heating
all of the above

⇒ Figure represen
LED
Varistor
SCR
Diac

⇒ In the given figure the ratio T/d is the duty fac
TRUE
FALSE

⇒ The potential of suppressor grid (with respect to cathode) is usually
zero
negative
positive
zero or positive

⇒ Tesla is unit of
Φ
B
H
MMF