GATE IN MCQ, MSQ and NAT Questions: Since the GATE Instrumentation Engineering exam will have both conceptual questions and numerical problems, it is important that you practice enough GATE IN MCQ, MSQ and NAT questions from the syllabus. A total of 65 questions wworth 1 mark and 2 marks will be asked in the GATE 2025 exam. For every incorrect answer, negative marking will apply. Knowing the exact number of GATE IN NAT questions and distribution of marks can help you score well. Besides, regularly solving GATE MCQs for Instrumentation Engineering can further help you comprehend the paper format and the type of questions anticipated from the GATE 2025 Instrumentation Engineering syllabus PDF more efficiently. In this article, we have compiled some of the most important GATE IN MCQ, MSQ and NAT questions that will serve as model questions or sample questions for the upcoming test. 

Also Check - GATE 2025 Instrumentation Engineering: Exam Date (Feb 1), Syllabus, Question Papers, Pattern, Cutoff

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MCQs for GATE Instrumentation Engineering Preparation

The GATE exam pattern for Instrumention Engineering states that primarily three kinds of questions will be asked in the examination. GATE Instrumentation MCQs having four answer options with only one correct answer; GATE IN MSQ questions having more than one correct answer, and GATE IN NAT questions wherein you need to solve the question and enter the correct numeric value. These questions are often puzzling complicated as there is one/ multiple possible answer to the question. The best way to get a solid grip on these is to solve a series of GATE Instrumentation MCQ, MSQ and NAT questions from past year questions papers and mock papers. 

Also Check - Mistakes to Avoid During GATE 2025 Last Minute Revisions

Important GATE IN MCQ, MSQ and NAT Questions

The following are some of the most important GATE MCQ, MSQ and NAT sample questions for the Instrumentation Engineering exam: 

Q1. Match the following measuring devices with their principle of measurement.

a. (P) − (III), (Q) − (IV), (R) − (II), (S) − (I)

b. (P) − (IV), (Q) − (III), (R) − (II), (S) − (I)

c. (P) − (III), (Q) − (I), (R) − (IV), (S) − (II)

d. (P) − (II), (Q) − (IV), (R) − (I), (S) − (III)

Ans.a. (P) − (III), (Q) − (IV), (R) − (II), (S) − (I)

Q2. A discrete-time sequence is given by x[n] = [1, 2, 3,4] for 0 ≤ n ≤ 3. The zero-lag auto-correlation value of x[n] is:

a. 1

b. 10

c. 20

d. 30

Ans.d. 30

Q3. Consider a filter defined by the difference equation:

Y[n] – 0.5y [n–2] = ax[n–4]

Where x[n] and y[n] represent the input and output, respectively. If the filter's magnitude response at ധ = π/2 is lH(π/2)l = 0.5, the value of a is? (rounded off to two decimal places).

a. 0.90 to 1.0

b. 0.70 to 0.80

c. 0.50 to 0.60

d. 0.10 to 0.20

Ans.0.70 to 0.80

Q4. An amplifier using an NMOS transistor. Assume that the transistor is in saturation with device parameters, μ_nC_OX = 250 μA/V2, threshold voltage VT = 0.65 V, and W/L = 4. Ignore the channel length modulation effect. The drain current of the transistor at the operating point is _________ μA (rounded off to the nearest integer).

a. 598 to 602

b. 600 to 606

c. 498 to 502

d. 478 to 482

Ans. c. 498 to 502

Q5. The inductance of a coil is measured as 10 mH, using an LCR meter, when no other objects are present near the coil. The LCR meter uses a sinusoidal excitation at 10 kHz. If a pure copper sheet is brought near the coil, the same LCR meter will read…?

a. less than 10 mH

b. 10 mH

c. more than 10 mH

d. less than 10 mH initially and then stabilizes to more than 10 mH

Ans. a. less than 10 mH

Q6. Which of the following flow meters offers the lowest resistance to the flow?

a. Turbine flow meter

b. Orifice flow meter

c. Venturi meter

d. Electromagnetic flow meter

Ans. d. Electromagnetic flow meter

Q7. The table shows the present state Q(t), the next state Q(t+1), and the control input in a flip-flop. Identify the flip-flop. 

a.  T flip-flop

b. D flip-flop

c. SR flip-flop

d. JK flip-flop

Ans. a. T flip-flop

Q8. A light-emitting diode (LED) emits light when it is _____biased. A photodiode provides maximum sensitivity to light when it is_____ biased. 

a. forward, forward

b. forward, reverse

c. reverse, reverse

d. reverse, forward

Ans. b. forward, reverse

Q9. The diode in the circuit is ideal. The current source is(t) = πsin (3000πt) mA. The magnitude of the average current flowing through the resistor R is ______mA (rounded off to two decimal places).

a. 0.80 to 0.91

b. 0.65 to 0.70

c. 0.95 to 1.05

d. 1.00 to 1.15

Ans. c. 0.95 to 1.05

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Q10. A unity-gain negative-feedback control system has a loop-gain L(s) given by L(s) = 6/s(s–5). The closed loop system is …?

a. Causal and stable

b. Causal and unstable 

c. Non-causal and stable 

d. Non-causal and unstable 

Ans. b. Causal and unstable 

Q11. A 1 kHz sine-wave generator having an internal resistance of 50 Ω generates an open-circuit voltage of 10 V_p-p. When a capacitor is connected across the output terminals, the voltage drops to 8 V_p-p. The capacitance of the capacitor (in microfarads) is _______ (round off to two decimal places) 

a. 2.35 to 2.43 

b. 1.35 to 1.43

c. 3.35 to 4.43

d. 5.35 to 6.43

Ans. a. 2.35 to 2.43

Q12. A resistor ladder digital-to-analog converter (DAC) receives a digital input that results in the circuit having the state. For this digital input, the Thevenin voltage, V_th, and Thevenin resistance, R_th,  as seen at the output node are …?

a. V_th = 0.5 V, R_th = 1 kΩ

b. V_th = 0.5 V, R_th = 2 kΩ

c. V_th = 1 V, R_th = 1 kΩ

d. V_th = 1 V, R_th = 2 kΩ

Ans.c. V_th = 1 V, R_th = 1 kΩ

Q13. In the small signal circuit shown, the enhancement mode n-channel MOSFET is biased in saturation with transconductance gm. If channel length modulation is ignored, the small signal impedance looking into the node P is given by …?

a. R_S || R_L || g_m^-1

b. R_S || g_m^-1

c. (R_S + R_L) || g_m^-1

d. R_L || g_m^-1

Ans. b. R_S || g_m^-1

Q14. A capacitor is constructed using two concentric spheres and air as the dielectric medium (permittivity of air = 8.854 × 10^-12 F/m). The radii of the inner and outer spheres are a =10 cm and b=15 cm, respectively. The capacitance (in picofarads) is … (round off to 2 decimal places)

a. 32.8 to 33.9 

b. 30.1 to 31.3

c. 45.9 to 46.9

d. 55.9 to 56.9 

Ans. a. 32.8 to 33.9

Q15. A car is moving collinearly with a laser beam emitted by a transceiver. A laser pulse emitted at t = 0 s is received back by the transceiver 100 ns (nanoseconds) after reflection from the car. A second pulse emitted at t = 0.1 s is received back 90 ns later. Given the speed of light is 3 × 10 m/s, the average car speed in this interval is …?  

a. 54 kmph, moving towards the transceiver

b. 108 kmph, moving towards the transceiver

c. 54 kmph, moving away from the transceiver 

d. 108 kmph, moving away from the transceiver 

Ans. a. 54 kmph, moving towards the transceiver

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CollegeDekho Pro Tips to Prepare MCQs for GATE Instrumentation Engineering 

Before you solve GATE Instrumentation MCQs, MSQ and NAT questions, here are some important tips to follow:-

1. Understand exam pattern and syllabus: The GATE 2025 Instrumental Engineering question paper will consist of topics from the Instrumental Engineering syllabus. Therefore, it is important to study the syllabus and understand the exam pattern while preparing for the upcoming exam.

2. Study from a reputed question bank: Various GATE question banks provide standard MCQ questions that you should practice. Solving these questions will help you increase your speed and efficiency while solving the questions in the actual exam.

3. Study from previous years’ question papers:GATE previous years question papers provide important information while preparing for the GATE Instrumentation Engineering exam. The previous years’ question papers will provide good questions to practice for the exam and give you clarity on the exam pattern and marking scheme of the exam.

4. Take notes from previous years’ toppers: While preparing for the GATE Instrumentation Engineering exam, it can be a good idea to take notes from past years’ toppers to get a better direction for exam preparations. You can check online interviews and testimonials to learn tips and tricks and subsequently incorporate them into your study plan.

5. Make short notes: Short notes are essential study material for exam preparations, it is a good technique to make short notes of all the important topics as you go on with your exam studies. These short notes come in handy when you revisit these topics while revising the syllabus. 

6. Give sufficient time to revise important topics: Revising what you have already studied is important, revising all the important topics in the syllabus should be revised multiple times to ensure the best possible exam preparation.

7. Make a comprehensive study plan: Before starting with studies, you must make a detailed and focused study plan. Ensure that you give sufficient time to each section of the syllabus and revisions. 

8. Participate in test series: Test series are designed to assess your exam preparation, you should participate in multiple mock test series to practice all the important concepts in the syllabus. 

9. Prepare important formulas, concepts, and relations: To strengthen your fundamental knowledge of the subject, make sure you have prepared all the concepts, formulas, and relations in the syllabus. 

10. Take sufficient rest: It is important to ensure that you are in the best shape mentally and physically. It is advised to take enough rest between studies and ensure that you stay relaxed and calm during the preparation process.

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We hope this article proves helpful to students looking for a GATE MCQ for Instrumentation Engineering. For more updates, stay tuned to CollegeDekho!