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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following is the binary equivalent of the decimal number 10?(a) 1100(b) 1010(c) 1011(d) 1110I got this question in an internship interview.Query is from Digital Circuits in chapter Digital Circuits of Analytical Instrumentation

Answer»

The correct answer is (b) 1010

To elaborate: The binary EQUIVALENT of the DECIMAL number 10 is 1010. The base of binary numbers is 2.

2.

In analytical instrumentation, little circuitry is concerned with the amplification and processing of signals.(a) True(b) FalseThe question was asked during a job interview.Enquiry is from Digital Circuits in chapter Digital Circuits of Analytical Instrumentation

Answer»

Right CHOICE is (b) False

Easiest explanation: In analytical instrumentation, most circuitry is concerned with the amplification and processing of SIGNALS. The signals are usually in ANALOG FORM.

3.

Which of the following samples the analog signals to obtain their digital equivalent?(a) Analog to digital converter(b) Electronic counter(c) Comparator(d) Digital to analog converterI got this question in an interview for job.This intriguing question originated from Digital Circuits topic in division Digital Circuits of Analytical Instrumentation

Answer»

The CORRECT choice is (a) Analog to digital converter

Easy explanation: Analog to digital converter samples the analog SIGNALS to obtain their digital EQUIVALENT. There are different TYPES of analog to digital converters.

4.

Which of the following is known as a nibble?(a) 1 bit(b) 4 bits(c) 8 bits(d) 16 bitsThis question was addressed to me during an internship interview.I would like to ask this question from Digital Circuits in division Digital Circuits of Analytical Instrumentation

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The correct CHOICE is (B) 4 bits

Explanation: 4-bit units are known as nibbles. A byte CONSISTS of two nibbles.

5.

In TTL logic, the input transistor has a number of ________ equal to the desired fan-in of the circuit.(a) Base(b) Collect(c) Emitter(d) GateI have been asked this question in an interview for internship.The question is from Logic Families in section Digital Circuits of Analytical Instrumentation

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Right answer is (c) Emitter

Easiest explanation: In TTL LOGIC, the INPUT transistor has a number of EMITTERS equal to the DESIRED fan-in of the circuit. This is a major advantage.

6.

The standard TTL gates are marketed as _______ series.(a) 80(b) 82(c) 74(d) 08I had been asked this question by my college director while I was bunking the class.This key question is from Logic Families topic in section Digital Circuits of Analytical Instrumentation

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The correct OPTION is (c) 74

Explanation: The STANDARD TTL gates are marketed as 74 series. They can operate up to 70^0C.

7.

The switching of MOS gates can be improved by using CMOS.(a) True(b) FalseThis question was addressed to me during a job interview.My question is based upon Logic Families topic in portion Digital Circuits of Analytical Instrumentation

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The correct ANSWER is (a) True

To elaborate: The switching of MOS gates can be improved by using CMOS. CMOS stands for COMPLEMENTARY MOS. It is an inverter.

8.

Which of the following is not the advantage of MOS gates?(a) Low power dissipation(b) Small size(c) Good immunity to noise(d) High switching speedsThis question was addressed to me in exam.I would like to ask this question from Logic Families in division Digital Circuits of Analytical Instrumentation

Answer» CORRECT OPTION is (d) High SWITCHING speeds

For explanation I would say: MOS gates do not have a high switching speed. They have LIMITED switching capability.
9.

ECL is a way of achieving a higher speed of gate.(a) True(b) FalseThe question was posed to me in a job interview.Query is from Logic Families in section Digital Circuits of Analytical Instrumentation

Answer» RIGHT OPTION is (a) True

Explanation: We can achieve a high SPEED of gate by sing ECL. ECL stands for emitter-coupled logic.
10.

The basic function of TTL gate is which of the following functions?(a) AND(b) OR(c) NOR(d) NANDThe question was asked at a job interview.Question is from Logic Families topic in division Digital Circuits of Analytical Instrumentation

Answer» RIGHT option is (d) NAND

Explanation: The basic FUNCTION of TTL gate is a NAND function. It is the most popular logic FAMILY.
11.

The logic ‘0’ of ECL is represented as ______V and logic ‘1’ is represented as ______V.(a) 1, 1.65(b) 0.9, 1.75(c) 1.2, 2.35(d) 1.9, 4.3I got this question in semester exam.The above asked question is from Logic Families in chapter Digital Circuits of Analytical Instrumentation

Answer» CORRECT option is (B) 0.9, 1.75

Explanation: The logic ‘0’ of ECL is represented as 0.9 V and logic ‘1’ is represented as 1.75 V. ECL STANDS for emitter-coupled logic.
12.

Which of the following is the most widely employed logic family?(a) Emitter-coupled logic(b) Transistor-transistor logic(c) CMOS logic family(d) NMOS logicThis question was posed to me at a job interview.This interesting question is from Logic Families topic in chapter Digital Circuits of Analytical Instrumentation

Answer»

Correct choice is (b) Transistor-transistor logic

To EXPLAIN: Transistor-transistor logic is the most WIDELY EMPLOYED logic family. It is the most popular logic family.

13.

The output will be logic ‘1’ only if all the inputs are ‘0’. Which gate must be used to execute this condition?(a) AND gate(b) NAND gate(c) NOR gate(d) EX-OR gateI got this question in class test.I would like to ask this question from Digital Circuits topic in section Digital Circuits of Analytical Instrumentation

Answer»

Right OPTION is (B) NAND gate

Easy explanation: The output will be logic ‘1’ only if all the INPUTS are ‘0’. NAND gate must be used to execute this CONDITION.

14.

Schottky TTL logic family does not have which of the following features?(a) Good fan-in(b) Good fan-out(c) High speed capability(d) High propagation delayThis question was addressed to me in an online interview.The origin of the question is Logic Families topic in section Digital Circuits of Analytical Instrumentation

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The correct ANSWER is (d) High propagation delay

The explanation is: SCHOTTKY TTL circuits have REDUCED propagation delay than normal TTL circuits. The propagation delay of 10ns is very high for some applications.

15.

Which of the following is the propagation delay of TTL circuits?(a) 1 s(b) 1 ms(c) 1 ns(d) 1 psI have been asked this question by my college director while I was bunking the class.I want to ask this question from Logic Families in division Digital Circuits of Analytical Instrumentation

Answer» RIGHT answer is (c) 1 ns

To EXPLAIN: The propagation delay of the TTL CIRCUIT is 1 ns. It is the main CHARACTERISTIC of the TTL circuit.
16.

Which of the following can be used to store information?(a) Gates(b) ADC(c) DAC(d) Flip-flopsThis question was addressed to me in an interview for job.This interesting question is from Digital Circuits topic in division Digital Circuits of Analytical Instrumentation

Answer»

The correct answer is (d) Flip-flops

Easy EXPLANATION: Flip-flops can be used to store INFORMATION. They are used in SEQUENTIAL CIRCUITS.

17.

1001 is a data presented on a set of binary coded decimal output lines. What would be the decimal equivalent of this number in the case of negative logic?(a) 9(b) 6(c) 1(d) 8I got this question at a job interview.I need to ask this question from Digital Circuits in section Digital Circuits of Analytical Instrumentation

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Right answer is (B) 6

For EXPLANATION I would say: The decimal equivalent of the NUMBER 1001 in the case of negative logic is 6. In the case of POSITIVE logic, the decimal equivalent will be 9.

18.

Two switches are in parallel and are connected with a lamp and supply in series. This represents which of the following logic gate?(a) AND gate(b) OR gate(c) EX-OR gate(d) NOT gateI got this question in unit test.This interesting question is from Digital Circuits in portion Digital Circuits of Analytical Instrumentation

Answer»

The correct option is (b) OR gate

Easiest explanation: Two switches are in PARALLEL and are CONNECTED with a lamp and SUPPLY in SERIES. This FORMS the OR gate.

19.

CMOS gates are commercially available as which of the following series?(a) 1000(b) 2000(c) 3000(d) 4000I have been asked this question by my college director while I was bunking the class.I'd like to ask this question from Logic Families topic in chapter Digital Circuits of Analytical Instrumentation

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Right answer is (d) 4000

Explanation: CMOS gates are COMMERCIALLY available as 4000 series. This TECHNIQUE is most suitable for COMMERCIAL circuits.

20.

Given below is the equivalent circuit of a logic gate. Identify the logic gate.(a) AND gate(b) OR gate(c) EX-OR gate(d) NOT gateThis question was addressed to me in final exam.The doubt is from Digital Circuits topic in chapter Digital Circuits of Analytical Instrumentation

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Right OPTION is (a) AND gate

The BEST I can explain: The given CIRCUIT is the AND gate. The OUTPUT of the gate is, Y=X1.X2

21.

INHIBIT gate is ________ gate with an inhibiting input.(a) AND gate(b) OR gate(c) EX-OR gate(d) NOT gateThe question was asked in exam.Asked question is from Digital Circuits in chapter Digital Circuits of Analytical Instrumentation

Answer»

The correct choice is (B) OR gate

The BEST I can EXPLAIN: INHIBIT gate is OR gate with an INHIBITING input. The gate is useful for controlling the inputs with an inhibiting signal.