Computer Knowledge

Digital Logic and Microprocessors

735 Questions

Digital logic and microprocessors form the core of computer science, covering logic gates, combinational and sequential circuits, and CPU architecture. These topics are crucial for computer knowledge sections in technical exams. Test your digital electronics basics here.

Logic gates and circuitsCombinational vs sequential circuitsMicroprocessor instructionsTruth tables and boolean functions

Digital Logic and Microprocessors Questions

Multiple choice

What is the value present in Accumulator after executing the above instruction in 8085 processor?

MOV A,F0H; STC RRC RRC RRC HLT

  1. 3E

  2. 1E

  3. 87

  4. 2E

  5. FE
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A contains F0 (in hexadecimal), F0 can be written as 1111 0000 STC(set Carry Flag) CF=1 RRC(Rotate Right ACCUMULATOR with Carry) Now Rotate the accumulator content to the right with carry thrice Initial data 1 1111 0000 First Rotation 0 1111 1000 second Rotation 0 0111 1100 Third Rotation 0 0011 1110 In Hexadecimal 0011 1110 is written as 3E

Multiple choice

For the CNC part programming, match Group A with Group B:

     
Group A Group B
P : Circular interpolation, counter clock wise I : G02
Q : dwell II : G03
R : circular interpolation, clock wise III : G04
S : point to point countering IV : G00

  1. P - II, Q - III, R - I, S - IV

  2. P - I, Q - III, R - II, S - IV

  3. P - I, Q - IV, R - II, S - III

  4. P - II, Q - I, R - III, S - IV
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

G03 – Circular interpolation, counter clockwise G04 – Dwell G02 – Circular interpolation, clockwise G00 – Point to point countering So P - II, Q - III, R - I, S - IV

Multiple choice the operational amplifier (op-amp) electronics physics properties of an ideal op-amp

An input applied to either input terminal will result in _____.

  1. outputs from both output terminals, which have opposite polarities

  2. outputs from both output terminals, which have the same polarities

  3. a single output from one of the output terminals

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a differential amplifier configuration, an input applied to one terminal results in outputs at both terminals that are equal in magnitude but opposite in phase (polarity).

Multiple choice physics semiconductors integrated circuits & microprocessor integrated chips semiconductor devices

Choose the correct statements:

  1. It is easier to fabricate $10000$ AND gates using circuit components than on an integrated chip.
  2. It is easier to fabricate $10000$ AND gates on an integrated chip than fabricating them using circuit components.

  3. It is easier to fabricate a single AND gate using circuit components as compared to on an IC.

  4. It is easier to fabricate a single AND gate on an IC as compared to using circuit components.
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

Integrated chips have advantage when being used to fabricate a number of components at the same time. However when single component is being fabricated, it is advisable to fabricate components using circuit components instead of an Integrated Circuit.

Multiple choice economics consumption and investment functions determinants of consumption function and savings function production, consumption, saving and economic units ex ante and ex post

Which of the following can have a negative value?

  1. APC

  2. MPC

  3. MPS

  4. APS
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

APS refers to Average Propensity to save which defines the amount of savings in every 1 rupee of income for all level of income which can never be more than one as savings can be negative in situations when consumption is more than the national income leading to dis-savings in the economy i.e. before the break even point when APS<0.

Multiple choice physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

A digital signal

  1. is less reliable than analog signal

  2. is more reliable than analog signal

  3. is equally reliable as the analog signal

  4. Not at all reliable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Noise is added to digital signal also but its easier to remove the noise and amplify the digital signals as compared to analog signals, because analog signals contain many frequencies.

Multiple choice physics electric current through conductors carbon resistance and colour codes for carbon resistance carbon resistors and their colour coding resistors

The________ indicates the multiplier telling you the power of ten to which the two significant digits in color coding of the resistor  must be multiplied (or how many zeros to add).

  1. 2nd band

  2. 3rd band

  3. 4th band

  4. last band
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The 3rd band indicates the multiplier telling the power of ten to which the two significant digits in color coding of the resistor must be multiplied.


Answer-(B)

Multiple choice classification of computer introduction to the information age physics

At Pushdown automata is __________ if there is at most one transition applicable to each configuration.

  1. Deterministic

  2. None-deterministic

  3. Finite

  4. None-finite
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At pushdown automata is deterministic if there is at most one transition applicable to each configuration.

In automata theory, a deterministic pushdown automaton (DPDA or DPA) is a variation of the push down automata. The class of deterministic pushdown automata accepts the deterministic context free languages, a proper subset of context free languages.

 A deterministic pushdown automaton has at most one legal transition for the same combination of input symbol, state, and top stack symbol. 

A pushdown automaton (PDA) is a finite state machine which has an additional stack storage. The transitions a machine makes are based not only on the input and current state, but also on the stack.


Multiple choice maths mathematical reasoning special words/phrases duality mathematical logic

To perform product of maxterms Boolean function must be brought into

  1. and terms

  2. or terms

  3. not terms

  4. nand terms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For performing Product of Maxterms, it has to be brought into POS, i.e; Product of Sum form. For this, the Boolean Function must be brought into OR terms.

Multiple choice maths mathematical reasoning special words/phrases duality mathematical logic

To perform product of maxterms Boolean function must be brought into

  1. and terms

  2. or terms

  3. not terms

  4. nand terms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For performing Product of Maxterms, it has to be brought into POS, i.e; Product of Sum form. For this, the Boolean Function must be brought into OR terms.

Multiple choice meaning and elements of computer system computer in accounting accountancy

In analog computer

  1. Input is first converted to digital form

  2. Input is never converted to digital form

  3. Output is displayed in digital form

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In analog computer Input is never converted to digital form.

A device that processes infinitely varying signals, such as voltage or frequencies. A thermometer is a simple analog computer. ... Although special-purpose, complex analog computers are built, almost all computers are digital. Digital methods provide programming flexibility.

An analog computer is a computer which is used to process analog data. Analog computers store data in a continuous form of physical quantities and perform calculations with the help of measures. It is quite different from the digital computer, which makes use of symbolic numbers to represent results.