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GATE Instrumentation Mock Test - 3 - GATE Instrumentation MCQ


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30 Questions MCQ Test GATE Instrumentation 2026 Mock Test Series - GATE Instrumentation Mock Test - 3

GATE Instrumentation Mock Test - 3 for GATE Instrumentation 2025 is part of GATE Instrumentation 2026 Mock Test Series preparation. The GATE Instrumentation Mock Test - 3 questions and answers have been prepared according to the GATE Instrumentation exam syllabus.The GATE Instrumentation Mock Test - 3 MCQs are made for GATE Instrumentation 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for GATE Instrumentation Mock Test - 3 below.
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GATE Instrumentation Mock Test - 3 - Question 1

A number described as 'frabjous' is characterized as a three-digit number where all digits are odd and no two adjacent digits are identical. For instance, 137 qualifies as a frabjous number, whereas 133 does not. What is the total count of such frabjous numbers?

GATE Instrumentation Mock Test - 3 - Question 2

Ankita needs to ascend 5 stairs starting from the ground level, while following these rules:

1. At any moment, Ankita can either advance one stair or two stairs at a time.

2. At no point can Ankita descend to a lower step. Let F (N) represent the total number of distinct ways for Ankita to reach the Nth stair.
For instance, F (1) = 1, F (2) = 2, F (3) = 3.
What is the value of F (5)?

GATE Instrumentation Mock Test - 3 - Question 3

The genetic information encoded in DNA is utilized to produce proteins essential for life's processes. DNA consists of four nucleotides: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G). This genetic information can be viewed as a sequence formed by these four nucleotides: A, T, C, and G. DNA is categorized into coding and non-coding regions, with coding regions being those where the nucleotide sequences are interpreted in triplets to create individual amino acids—making up only about 2% of the total human DNA. For instance, the nucleotide triplet CCG corresponds to the amino acid glycine, whereas the triplet GGA corresponds to proline. These amino acids are subsequently linked together to create a protein.
Based solely on the details given above, which of the following statements can be confidently inferred?

  • (i) The vast majority of human DNA does not participate in protein synthesis.
  • (ii) The function of approximately 98% of human DNA remains unclear.

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 3

(i) The majority of human DNA has no rule in the synthesis of proteins can be inferred with certainty, as “the information contained in DNA is used to synthesis proteins is given in the passage. Apart from this there in no information in passage that how much part of human DNA has role in the synthesis of proteins.

(ii) The function of about 98% of human DNA is not understood can be inferred with certainty as “DNA has coding and non-coding regions. Coding regions constitute only about 2% of human DNA” is given in the passage and we have no information about non-coding region of DNA in the passage.

Hence, the correct option is (D).

GATE Instrumentation Mock Test - 3 - Question 4

What is the likelihood of obtaining the same number on all three dice when they are rolled simultaneously?

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 4

Total possible cases = 63 = 216
Favourable cases = (1, 1, 1), (2, 2, 2), (3, 3, 3), (4, 4, 4), (5, 5, 5) and (6, 6, 6).
Probability = 6/216 = 1/36

Alternate Solution:
Out of 6 numbers (1, 2, 3, 4, 5, 6) we can select 1 in 6C1 ways. The same number will turn up in each die. The probability in each one is 1/6.
So required probability = 6C1 × 1/6 × 1/6 × 1/6 = 6/216 = 1/36

GATE Instrumentation Mock Test - 3 - Question 5

Given the digits: 2, 2, 3, 3, 4, 4, 4, 4, how many unique 4-digit numbers can be created that are greater than 3000?

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 5

The given digits are 2, ,2, 3, 3, 3, 4, 4, 4, 4 we have to find the numbers that are greater than 3000

∴ The first digit can be 3 or 4 but not 2.

Now, let us fix the first, second and third digits as 3, 2, 2 then the fourth place can be filled in 3 ways.


∴ The number of ways is 3 similarly, we fix first third and fourth place as 3, 2 and 2 respectively (4) so the second place can be filled in 3 ways again,


The number of ways is 3

Now, we fix first, second and fourth, previous cases and we obtain the same result.

∴ The number of ways is 3 so, the total number of ways is 9 similarly this can done by fixing the numbers as 3 and 4 (instead of 2) and thereby we obtain a ways each.

The number of numbers starting with 3 is 27

Similarly by taking 4 as the first digit we get 27 numbers

∴ The number of numbers that are greater than 3000 is 27 + 27 = 54

But, 3222, 4222, is not possible as there are only two 2's, 3333 is not possible as there are only three 3's

∴ The total number of numbers that are greater than 3000 is 54 – 3 = 51.

GATE Instrumentation Mock Test - 3 - Question 6

Examine the circuit depicted below that incorporates the Si transistor.

What will be the collector current IC and the operating region of the transistor?

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 6

Let the transistor be in active region.

Now, let us check whether the transistor is in active region or not by applying KVL in Base collector loop.

GATE Instrumentation Mock Test - 3 - Question 7

The capacitance 'C' of a parallel plate capacitor is determined to be 20 pF based on the formula where ε0 represents the permittivity of free space, er denotes the relative permittivity of the dielectric, A is the area of overlap between the plates, and d is the separation distance between them. The value of C is subsequently assessed with an ideal LCR meter, which is assumed to have no errors attributed to cable capacitance. Which of the following statements is likely to be accurate?

GATE Instrumentation Mock Test - 3 - Question 8

The provided table illustrates the current state Q(t), the subsequent state Q(t 1), and the control input associated with a flip-flop. Determine the type of flip-flop.

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 8

Given : Table of present state Q(t) , next state Q(t +1) and control input is shown below,

From the given table, Q(t +1) = Q(t )  Input ...(i)
Comparing equation (i) with characteristics equation of T-flip-flop.
Q(t +1) = Q(t )  T
Hence, it is a T flip-flop.
Hence, the correct option is (A).

GATE Instrumentation Mock Test - 3 - Question 9

The charge density in the area R: x² y² ≤ 1, y ≤ 0 is defined as σ(x, y) = 1 C/m², where x and y are measured in metres. What is the total amount of charge (in Coulombs) present in the region R?

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 9


GATE Instrumentation Mock Test - 3 - Question 10

Determine the solution to the differential equation 

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 10


GATE Instrumentation Mock Test - 3 - Question 11

A light emitting diode (LED) produces light when it is _____ biased. A photodiode achieves its highest sensitivity to light when it is _____ biased.

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 11

LED emits light in the forward biased.
Photodiode provides maximum sensitivity to light in reverse biased.
Hence, the correct option is (B).

GATE Instrumentation Mock Test - 3 - Question 12

When expressed as a power series centered at z = 2, it will yield with a region of convergence (ROC) defined by |z - 2| < 1. The coefficients ak, where k ≥ 0, are provided by the expression________.

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 12

Let z – 2 = t
z = 2 + t

Hence, the correct option is (B).

GATE Instrumentation Mock Test - 3 - Question 13

The function x(t), for t ≥ 0, that satisfies the differential equation with the initial condition x(0) = 1 and is

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 13

Given : Differential equation is, 
Initial conditions, x(0) = 1,x '(0)= 0

Taking Laplace transform on both sides,

Taking inverse Laplace transform,
x(t ) = 1
Hence, the correct option is (C).

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 14

Let x and y be two random variables such that E[x2] = E[y2] and both have a mean of zero. Define two new random variables w1 and w2 as follows: w1 = x y and w2 = x − y. What is the correlation coefficient between w1 and w2?


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 14

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 15

What is the Nyquist sampling rate (in samples per second) for the signal x(t) = sin c(200t) sin2 c(1000t)?


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 15

sin c(200)t has a rectangular spectrum in the interval < 100 Hz and sin c2 (1000t) = [sin c(1000t)][sin c(1000t)] has a triangular spectrum.
Thus, x (δ)  has spectrum in the range |f| ≤ 1100 Hz.
So, the Nyquist sampling rate is,
2|f|  = 2(11000 = 2200 Hz

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 16

The count of zeros of the polynomial P(s) = s3 2s2 5s 80 in the right half of the s-plane is _________. 


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 16

Given : Polynomial, P(s) = s3 + 2s2 + 5s + 80
Routh tabulation of P(s), 

Since, there are 2 sign changes in the first column of Routh tabulation.
The number of zeros in the right half of s-plane will be 2.
Hence, the correct answer is 2.

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 17

Given the function f(x) = x(x − 2), what is the value of 'c' as per Lagrange's mean value theorem for f(x) when a = 0 and b = 1.5? (Provide your answer rounded to two decimal places)


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 17

f(x) = x2 - 2x
By Lagrange's mean value theorem, we have

GATE Instrumentation Mock Test - 3 - Question 18

In a p-i-n photodiode, a light pulse that comprises 8 x 1012 incident photons at a wavelength of λ0 = 1.55 mm results in an average collection of 4 x 1012 electrons at the device terminals. What is the quantum efficiency of the photodiode at this wavelength in percentage (%)?

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 18

Given : Number of electrons collected = 4 x 1012 and number of incident photons = 8 x 1012 Quantum efficiency,

Hence, the correct option is (A).

GATE Instrumentation Mock Test - 3 - Question 19

A pressure sensor of the quartz piezoelectric type is equipped with an integrated charge amplifier. The sensitivity of this sensor is 1 µV/Pa. When exposed to a constant pressure of 120 kPa, what is the steady-state output of the transducer?

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 19

The output voltage of a pressure sensor can be calculated using the formula:

  • Output Voltage = Sensitivity × Pressure

Given:

  • Sensitivity = 1 µV/Pa
  • Pressure = 120 kPa

Now, convert the pressure to Pascals:

  • 120 kPa = 120,000 Pa

Substituting the values:

  • Output Voltage = 1 µV/Pa × 120,000 Pa = 120 mV

Thus, the steady-state output of the transducer is 120 mV.

GATE Instrumentation Mock Test - 3 - Question 20

Examine the following assertions regarding a discrete linear time-invariant (LTI) system characterized by its frequency response and impulse response h[n]:
1. 
2. The system is causal.
3. The discrete-time Fourier transform (DTFT) of h[n 1] is purely imaginary.
Which of the following statements is correct in relation to the above assertions?

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 20

 implies h[n] is real.
h[n] = 0 for n < 0 system is causal.
DTFT of h[n + 1] is imaginary implies h[n + 1] is odd.

GATE Instrumentation Mock Test - 3 - Question 21

What is the simplified expression of the Boolean function F (W , X , Y , Z ) = ∑(4, 5,10,11,12,13,14,15) that contains the least number of terms and the fewest literals in each term?

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 21

Given : F (W , X , Y , Z ) = ∑(4, 5,10,11,12,13,14,15)
K-map of function F (W , X , Y , Z ) is shown below,

*Multiple options can be correct
GATE Instrumentation Mock Test - 3 - Question 22

A continuous real-valued signal x(t) possesses finite positive energy and is defined as x(t) = 0,  for t < 0. From the options listed below, identify ALL the signals whose continuous-time Fourier transform is entirely imaginary.

Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 22

x(t) is a real signal having finite positive energy and x(t ) = 0, t < 0 . 
Consider option (A) :
Let y(t ) = x(t ) + x(-t ) &.(i)
y(-t ) = x(-t ) + x(t ) &.(ii)
From equations (i) and (ii),
y(-t )= y(t )
Also, y(t) is a real function
∴ y(t) is real and even function. So, fourier transform of y(t) will be Real and even function. 
So, option (A) is incorrect. 
Consider option (B) :
Let y(t ) = x(t ) - x(-t ) &(i)
y(-t ) = x(-t ) - x(t )
y(-t ) = -[ x(t ) - x(-t )] &(ii)
From equation (i) and (ii),
y(-t ) = - y(t )
Also, y(t) is a real function 
∴ y(t) is real and odd function 
So, Fourier transform of y(t) will be imaginary and odd function. 
So, option (B) is correct.
Consider option (C) :
Let y(t ) = j[ x(t ) + x(-t )] &(i)
y(-t ) = j[ x(-t ) + x(t )] &(ii)
From equation (i) and (ii),
y(-t )= y(t )
Also, y(t) is an imaginary function 
∴ y(t) is imaginary and even function
So, Fourier transform of y(t) will be imaginary and even function 
So, option (C) is correct.
Consider option (D) : 
Let y(t ) = j[ x(t ) - x(-t )] &(i)
y(-t ) = j[ x(-t ) - x(t )]
y(-t ) = - j[ x(t ) - x(-t )] &(ii) 
From equation (i) and (ii),
y(-t ) = - y(t )
Also, y(t) is an imaginary function,
∴ y(t) is imaginary and odd function. 
So, Fourier transform of y(t) will be real and odd function. 
So, option (D) is incorrect.
Hence, the correct options are (B) and (C).

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 23

What is the output frequency (in Hz) of the circuit illustrated below?


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 23

14 stage binary will divide the frequency by 214.
Thus, output frequency

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 24

An RL circuit with resistance R = 10 kΩ and inductance L = 1 mH is subjected to a step current I0 u(t). At the moment just before t = 0 (denoted as t = 0-), the current through the inductor is IL = I0/5. What is the minimum time required for the current in the inductor to reach 99% of its final value, expressed in microseconds (rounded to two decimal places)?

 


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 24

Given circuit is shown below,


At t →∞, inductor act as short circuit,

IL (∞) = I0
Time constant 
Current in the inductor is given by,

For minimum time taken by current to reach 99% of its final value,

Hence, the correct answer 0.438.

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 25

How many five-digit numbers can be created using the digits 3, 4, 5, and 6, ensuring that one digit appears exactly twice?


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 25

Given : Integers are 3, 4, 5 and 6, we have to form a five digit number using the given digits.
Let digit 3 is repeated twice. 
3  3  4  5  6
∴ r of five digit number that will be formed when digit 3 is repeated = 5!/2! = 60
Let digit 4 is repeated twice. 
3  4  4  5  6
∴ Number of five digit number that will be formed when digit 4 is repeated = 5!/2! = 60
Let digit 5 is repeated twice. 
3  4  5  5  6
∴ Number of five digit number that will be formed when digit 5 is repeated = 5!/2! = 60
Let digit 6 is repeated twice
∴ Number of 5 digit number that will be formed when digit 6 is repeated = 5!/2! = 60
Total number of 5 digit number that will be formed when a digit is repeated twice will be 60 x 4= 240 .
Hence, the correct answer is 240.

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 26

The rank of the following matrix A is one. What is the value of the ratio α/β ________. (rounded to the nearest integer)


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 26

Given : Rank of A, ρ( A)= 1
So, all 2 x 2 minors are zero,


Hence, the correct answer is – 8.

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 27

A linear variable differential transformer (LVDT) has two secondary outputs that produce a voltage of 2 V (RMS) when the core is in the zero displacement position. It has been observed that the phase of one of the secondaries deviates by one degree from the anticipated phase. Aside from this phase shift, the LVDT behaves ideally. Given that the differential output sensitivity of the LVDT is 1 mV (RMS)/1 μm, what is the output at zero displacement, rounded to one decimal place? __________ μm.


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 27

Zero disp
V1 = 2∠0
V2 = 2∠1
Vo = V1 - V

S = 1mv/ μv
disp = 34.9 μm
Hence, the correct answer is 34.9.

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 28

A weighing machine is used to take five measurements, yielding readings of 80 kg, 79 kg, 81 kg, 79 kg, and 81 kg. The sample standard deviation of these measurements is _______kg (rounded to two decimal places).


Detailed Solution for GATE Instrumentation Mock Test - 3 - Question 28

Given : Measurements are 80 kg, 79 kg, 81 kg, 79 kg and 81 kg.
The sample standard deviation is given as,

Hence, the correct answer is 1

*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 29

Four strain gauges RA, RB, RC, and RD, each having a nominal resistance of R, are arranged in a bridge configuration. When a force is applied, RA and RD increase by ΔR, while RB and RC decrease by ΔR as illustrated. A potentiometer with a total resistance of RV is connected as shown. Given that R = 100Ω and ΔR = 1Ω, what is the minimum resistance RV needed to balance the bridge? Provide your answer rounded to two decimal places.


*Answer can only contain numeric values
GATE Instrumentation Mock Test - 3 - Question 30

A 3-1/2 digit true RMS multimeter with a maximum reading of 1.999 V possesses an accuracy of ± 0.1% of the reading ± 2 digits. It is utilized to measure a 100 A (RMS) current in a line using a Class-1 current transformer with a ratio of 100:5 and a burden of 0.1 Ω ± 0.5%. What is the maximum absolute error in the output of the multimeter, expressed in volts and rounded to three decimal places?


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