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GATE EE 2025

GATE 2025 Previous Year

3 hDuration
100Total Marks
65Questions
12Sections
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Instructions

General instructions for this test:

  • Duration: 3 h. The timer starts as soon as you begin and cannot be paused.
  • Total questions: 65 across 12 section(s); maximum marks: 100.
  • You are allowed 1 attempt(s) at this test.
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Paper Structure

Electrical Machines

Electrical Machines

Q1. mcq single +2 / 0.67
A DC series motor with negligible series resistance is running at a certain speed driving a load, where the load torque varies as cube of the speed. The motor is fed from a 400 V DC source and draws 40 A armature current. Assume linear magnetic circuit. The external resistance, in $\Omega$, that must be connected in series with the armature to reduce the speed of the motor by half, is closest to
Q2. mcq single +1 / 0.33
The operating region of the developed torque ( $T_{\mathrm{em}}$ ) and speed ( $\omega$ ) of an induction motor drive is given by the shaded region OQRE in the figure. The load torque $\left(T_L\right)$ characteristic is also shown. The motor drive moves from the initial operating point O to the final operating point S . Which one of the following trajectories will take the shortes time?
Q3. mcq single +2 / 0.67
A 3-phase, $400 \mathrm{~V}, 4$ pole, 50 Hz star connected induction motor has the following parameters referred to the stator : $$ R_r^{\prime}=1 \Omega, X_S=X_r^{\prime}=2 \Omega $$ Stator resistance, magnetizing reactance and core loss of the motor are neglected. The motor is run with constant V/f control from a drive. For maximum starting torque, the voltage and frequency output, respectively, from the drive, is closest to,
Q4. mcq multi +1 / 0
Instruments required to synchronize an alternator to the grid is/are
Q5. numerical +1 / 0
The induced emf in a 3.3 kV , 4-pole, 3-phase, star-connected synchronous motor is considered to be equal and in phase with the terminal voltage under no load condition. On application of a mechanical load, the induced emf phasor is deflected by an angle of $2^{\circ}$ mechanical with respect to the terminal voltage phasor. If the synchronous reactance is $2 \Omega$, and stator resistance is negligible, then the motor armature current magnitude, in ampere, during loaded condition, is closest to __________ . (round off to two decimal places)
Analog Electronics

Analog Electronics

Q1. mcq single +1 / 0.33
Which one of the following statements is true about the small signal voltage gain of a MOSFET based single stage amplifier?
Q2. mcq single +2 / 0.67
In the circuit, shown below, if the values of $R$ and $C$ are very large, the form of the output voltage for a very high frequency square wave input, is best represented by
Q3. numerical +2 / 0
The op-amps in the following circuit are ideal. The voltage gain of the circuit is ___________. (Round off to the nearest integer)
Q4. mcq single +1 / 0.33
$$ \text { Assuming ideal op-smps, the circuit represents is } $$
Q5. mcq single +2 / 0.67
In the circuit, $I_{\mathrm{DC}}$ is an ideal current source. The transistors $M_1$ and $M_2$ are assumed to be biased in saturation, wherein $V_{\text {in }}$ is the input signal and $V_{D C}$ is fixed DC voltage. Both transistors have a small signal resistance of $r_{d s}$ and trans-conductance of $g_m$. The small signal output impedance of this circuit is
Electric Circuits

Electric Circuits

Q1. mcq multi +2 / 0
Consider two coupled circuits having self inductances $L_1$ and $L_2$ that carry non-zero currents $I_1$ and $I_2$ respectively. The mutual inductance between the circuit is $M$ with unity coupling coefficient. The stored magnetic energy of the coupled circuit is minimum at which of the following value(s) of $I_1 / I_2$ ?
Q2. mcq single +1 / 0.33
$$ \text { The I-V characteristics of the elements between the nodes } X \text { and } Y \text { is best depicted } $$
Q3. mcq single +1 / 0.33
A nullator is defined as a circuit element where the voltage across the device and the current through the device are both zero. A series combination of a nullator and a resistor of value, $R$, will behave as a
Q4. numerical +2 / 0.67
The switch ( S ) closes at $t=0 \mathrm{sec}$. The time, in sec the capacitor takes to charge to 50 V is __________ . (Round off to one decimal places)
Q5. numerical +2 / 0
In an experiment to measure the active power drawn by a single-phase RL Load connected to an AC source through a $2 \Omega$ resistor, three voltmeters are connected as shown in the figure below. The voltmeter readings are as follows : $\mathrm{V}_{\text {source }}=200 \mathrm{~V}$, $V_R=9 \mathrm{~V}, V_{\text {Load }}=199 \mathrm{~V}$. Assuming perfect resistors and ideal voltmeters, the Load-active power measured in this experiment, in $W$, is ___________ .
Q6. numerical +2 / 0
Using shunt capacitors, the power factor of a 3-phase, 4 kV induction motor (drawing 390 kVA at 0.77 pf lag) is to be improved to 0.85 pf lag. The line current of the capacitor bank, in $A$, is _________ (Round off to one decimal places)
Q7. mcq single +2 / 0.67
The transformer connection given in the figure is part of a balanced 3-phase circuit where the phase sequence is "abc". The primary to secondary turns ratio is $2: 1$. If ( $I_a+I_b+I_c=0$ ), then the relationship between $l_A$ and $l_{\text {ad }}$ will be
Q8. mcq single +1 / 0.33
The input voltage $v(t)$ and current $i(t)$ of a converter are given by, $v(t)=300 \sin (\omega t) \mathrm{V}$ $$ i(t)=10 \sin \left(\omega t-\frac{\pi}{6}\right)+2 \sin \left(3 \omega t+\frac{\pi}{6}\right)+\sin \left(5 \omega t+\frac{\pi}{2}\right) A $$ where, $\omega=2 \pi \times 50 \mathrm{rad} / \mathrm{s}$. The input power factor of the converter is closest to
Signals And Systems

Signals And Systems

Q1. numerical +2 / 0
An ideal low pass filter has frequency response given by $$ H(j \omega)= \begin{cases}1, & |\omega| \leq 200 \pi \\ 0, & \text { otherwise }\end{cases} $$ Let $h(t)$ be its time domain representation. Then $h(0)=$ ____________ (round off to the nearest integer)
Q2. mcq single +1 / 0.33
Consider a discrete-time linear time-invariant (LTI) system, $\boldsymbol{S}$, where $$ y[n]=S\{x(\mathrm{n})\} $$ $$Let\,\,\,\, S\{\delta[n]\}=\left\{\begin{array}{lc} 1, & n \in\{0,1,2\} \\ 0, & \text { otherwise } \end{array}\right. $$ where $\delta[n]$ is the discrete-time unit impulse function. For an input signal $x[n]$, the output $y[n]$ is
Q3. mcq single +2 / 0.67
The continuous-time unit impulse signal is applied as an input to a continuous-time linear time-invariant system $S$. The output is observed to be the continuous-time unit step signal $u(t)$. Which one of the following statements is true?
Q4. mcq single +1 / 0.33
Consider a continuous-time signal $$ x(t)=-t^2\{u(t+4)-u(t-4)\} $$ where $u(t)$ is the continuous-time unit step function. Let $\delta(t)$ be the continuous-time unit impulse function. The value of $$ \int_{-\infty}^{\infty} x(t) \delta(t+3) d t $$ is
Q5. mcq single +2 / 0.67
Let continuous-time signals $x_1(t)$ and $x_2(t)$ be $x_1(t)=\left\{\begin{array}{cc}1, & t \in[0,1] \\ 2-t, & t \in[1,2] \\ 0, & \text { otherwise }\end{array}\right.$ and $x_2(t)=\left\{\begin{array}{cc}t, & t \in[0,1] \\ 2-t, & t \in[1,2] \\ 0, & \text { otherwise }\end{array}\right.$. Consider the convolution $y(t)=x_1(t) * x_2(t)$. Then $\int\limits_{-\infty}^{\infty} y(t) d t$ is :
Q6. numerical +1 / 0
A continuous time periodic signal $x(t)$ is $$ x(t)=1+2 \cos 2 \pi t+2 \cos 4 \pi t+2 \cos 6 \pi t $$ If $T$ is the period of $x(t)$, then $\frac{1}{T} \int_0^T|x(t)|^2 d t=$________(round off to the nearest integer).
Power Electronics

Power Electronics

Q1. mcq single +2 / 0.67
In the following circuit, the average voltage $$ V_0=400\left(1+\frac{\cos \alpha}{3}\right) V $$ where $\alpha$ is the firing angle. If the power dissipated in the resistor is 64 W , then the closest value of $\alpha$ in degrees is
Q2. mcq single +2 / 0.67
An ideal sinusoidal voltage source $v(t)=230 \sqrt{2} \sin (2 \pi \times 50 t) \vee$ feeds an ideal inductor $L$ through an ideal SCR with firing angle $\alpha=0^{\circ}$. If $L=100 \mathrm{mH}$, then the peak of the inductor current, in ampere, is closest to
Q3. numerical +2 / 0
The steady state capacitor current of a conventional DC-DC buck converter, working in CCM, is shown in one switching cycle. If the input voltage is 30 V , the value of the inductor sued, in mH , is _________ (round off to one decimal place).
Q4. numerical +1 / 0
In the circuit with ideal devices, the power MOSFET is operated with a duty cycle of 0.4 in a switching cycle with $I=10 \mathrm{~A}$ and $V=15 \mathrm{~V}$. The power delivered by the current source, in $W$, is ________ . (round off to the nearest integer)
Q5. mcq single +2 / 0.67
The 3-phase modulating waveforms $\left(v_a(t), v_b(t), v_c(t)\right)$, used in sinusoidal PWM in a voltage source inverter (VSI) are $$ \begin{aligned} & v_a(t)=0.8 \sin (\omega t) \vee \\ & v_b(t)=0.8 \sin \left(\omega t-\frac{2 \pi}{3}\right) \vee \\ & v_c(t)=0.8 \sin \left(\omega t+\frac{2 \pi}{3}\right) \vee \end{aligned} $$ where $\omega=2 \pi \times 40 \mathrm{rad} / \mathrm{s}$ is the fundamental frequency. The modulating waveforms are compared with a 10 kHz triangular carrier whose magnitude varies between +1 and -1 . The VSI has a DC link voltage of 600 V and feeds a star connected motor. The per phase fundamental RMS motor voltage in volts is closest to
Digital Electronics

Digital Electronics

Q1. mcq single +2 / 0.67
A Boolean function is given as $$ f=(\bar{u}+\bar{v}+\bar{w}+\bar{x}) \cdot(\bar{u}+\bar{v}+\bar{w}+x) \cdot(\bar{u}+v+\bar{w}+\bar{x}) \cdot(\bar{u}+v+\bar{w}+x) $$ The simplified form of this function is represented by
Electromagnetic Fields

Electromagnetic Fields

Q1. mcq single +2 / 0.67
An air filled cylindrical capacitor (capacitance $C_0$ ) of length $L$, with $a$ and $b$ as its inner and outer radii, respectively, consists of two coaxial conducting surfaces. Its crosssectional view is shown in Figure (i). In order to increase the capacitance, a dielectric material of relative permittivity $\varepsilon_r$ is inserted inside $50 \%$ of the annular region as shown in figure (ii). The value of $\varepsilon_r$ for which the capacitance of the capacitor in figure (ii), becomes $5 C_0$ is
Q2. mcq single +1 / 0.33
Which one of the following figures represents the radial electric field distribution $E_R$ caused by a spherical cloud of electrons with a volume charge density. $\rho=-3 \rho_0$ for $0 \leq R \leq a$ (both $\rho_0, a$ are positive and $R$ is the radial distance) and $\rho=0$ for $R>a$ ?
Engineering Mathematics

Engineering Mathematics

Q1. numerical +2 / 0
Let $C$ be a clockwise oriented closed curve in the complex plane defined by $|\lambda|=1$. Further, let $f(x)=j z$ be a complex function, where $j=\sqrt{-1}$. Then, $\oint_C f(z) d z=$ ___________ .
Q2. mcq multi +2 / 0
Let $a_R$ be the unit radial vector in the spherical co-ordinate system. For which of the following value(s) of $n$, the divergence of the radial vector field $f(R)=a_R \frac{1}{R^n}$ is independent of $R$ ?
Q3. numerical +2 / 0
Let $(x, y) \in \Re^2$. The rate of change of the real valued function, $V(x, y)=x^2+x+y^2+1$ at the origin in the direction of the point $(1,2)$ is _________ (round off to the nearest integer)
Q4. mcq single +1 / 0.33
Consider discrete random variable $X$ and $Y$ with probabilities as follows: $$ \begin{aligned} & P(X=0 \text { and } Y=0)=\frac{1}{4} \\ & P(X=1 \text { and } Y=1)=\frac{1}{8} \\ & P(X=0 \text { and } Y=1)=\frac{1}{2} \\ & P(X=1 \text { and } Y=1)=\frac{1}{8} \end{aligned} $$ Given $X=1$, the expected value of $Y$ is
Q5. mcq single +2 / 0.67
Let $X$ and $Y$ be continuous random variables with probability density functions $P_X(x)$ and $P_Y(y)$, respectively. Further, let $Y=X^2$ and $P_X(x)=\left\{\begin{array}{cc}1, & x \in(0,1] \\ 0, & \text { otherwise }\end{array}\right.$. Which one of the following options is correct?
Q6. mcq single +1 / 0.33
Let $v_1$ and $v_2$ be the two eigen vectors corresponding to distinct eigen values of a $3 \times 3$ real symmetric matrix. Which one of the following statements is true?
Q7. mcq single +1 / 0.33
Let $A=\left[\begin{array}{ccc}1 & 1 & 1 \\ -1 & -1 & -1 \\ 0 & 1 & -1\end{array}\right]$ and $b=\left[\begin{array}{c}1 / 3 \\ -1 / 3 \\ 0\end{array}\right]$, then the system of linear equations $A x=b$ has
Q8. mcq single +1 / 0.33
The relationship between two variables $x$ and $y$ is given by $x+p y+q=0$ and is shown in the figure. Find the values of $p$ and $q$. Note: The figure shown is representative.
Q9. mcq single +1 / 0.33
Let $P=\left[\begin{array}{ccc}2 & 1 & 0 \\ -1 & 0 & 0 \\ 0 & 0 & 1\end{array}\right]$ and let $I$ be the identity matrix. Then $P^2$ is equal to
Q10. numerical +2 / 0
Consider ordinary differential equations given by $\dot{x}_1(t)=2 x_2(t), \dot{x}_2(t)=r(t)$ with initial conditions $x_1(0)=1$ and $x_2(0)=0$. If $r(t)=\left\{\begin{array}{ll}1, & t \geq 0 \\ 0, & t<0\end{array}\right.$, then $t=1, x_1(t)=$ _____________ (Round off to the nearest integer).
Q11. mcq single +1 / 0.33
Consider the set $S$ of points $(x, y) \in R^2$ which minimize the real valued function $$ f(x, y)=(x+y-1)^2+(x+y)^2 $$ Which of the following statements is true about the set $S$ ?
Control Systems

Control Systems

Q1. numerical +2 / 0
A controller $D(s)$ of the form $\left(1+K_D s\right)$ is to be designed for the plant $G(s)=\frac{1000 \sqrt{2}}{s(s+10)^2}$ as shown in the figure. The value of $K_D$ that yields a phase margin of $45^{\circ}$ at the gain cross-over frequency of $10 \mathrm{rad} / \mathrm{sec}$ is _________(round off to one decimal place).
Q2. mcq single +2 / 0.67
$$ \text { Let } G(s)=\frac{1}{(s+1)(s+2)} \text {. Then the closed-loop system shown in the figure below, is } $$
Q3. mcq multi +1 / 0
The open-loop transfer function of the system shown in the figure, is $$ G(s)=\frac{K s(s+2)}{(s+5)(s+7)} $$ For $K \geq 0$, which of the following real axis point(s) is/are on the rool locus?
Q4. mcq single +1 / 0.33
The Nyquist plot of a strictly stable $G(s)$ having the numerator polynomial as $(s-3)$ encircles the critical point -1 once in the anti-clockwise direction. Which one of the following statements on the closed-loop system shown in figure, is correct?
Q5. mcq single +1 / 0.33
Selected data points of the step response of a stable first-order linear time-invariant (LTI) system are given below. The closest value of the time-constant, in sec, of the system is $$ \begin{array}{|l|c|c|c|c|c|} \hline \text { Time (sec) } & 0.6 & 1.6 & 2.6 & 10 & \infty \\ \hline \text { Output } & 0.78 & 1.65 & 2.18 & 2.98 & 3 \\ \hline \end{array} $$
Q6. numerical +2 / 0
Consider the state-space model $$ \begin{aligned} \dot{x}(t) & =A x(t)+B u(t) \\ y(t) & =C x(t) \end{aligned} $$ where $x(t), r(t), y(t)$ are the state, input and output, respectively. The matrices $A, B, C$ are given below $$ A=\left[\begin{array}{cc} 0 & 1 \\ -2 & -3 \end{array}\right], B=\left[\begin{array}{l} 0 \\ 1 \end{array}\right], C=\left[\begin{array}{ll} 1 & 0 \end{array}\right] $$ The sum of the magnitudes of the poles is ___________. (Round off to nearest integer)
General Aptitude

General Aptitude

Q1. mcq single +2 / 0.67
Spheres of unit diameter are centered at ( $l, m, n$ ) where $l, m$ and $n$ take every possible integer values. The distance between two spheres is computed from the center of one sphere to the center of the other sphere. For a given sphere, $x$ is the distance to its nearest sphere and $y$ is the distance to its next nearest sphere. The value of $\frac{y}{x}$ is :
Q2. mcq single +1 / 0.33
Kavya__________go to work yesterday as she________ feeling well. Select the most approrpriate option to complete the above sentence.
Q3. mcq single +1 / 0.33
Good : Evil : : Genuine : ? Select the most appropriate option to complete the analogy.
Q4. mcq single +2 / 0.67
Identify the option that has the most appropriate sequence such that a coherent paragraph is formed : (P) It is because deer, like most of the animals that tigers normally prey on, run much faster! It simply means, another day of empty stomach for the big cats. (Q) Tigers spend most of their life searching for food. (R) If they trace the scent of deer, tigers follow the trail, chase the deer for a mile or two in the dark, and yet may not catch them. (S) For several nights, they relentlessely prowl through the forest, hunting for a trail that may lead to their prey.
Q5. mcq single +2 / 0.67
Scores obtained by two students P and Q in seven courses are given in the table below. Based on the information given in the table, which one of the following statements is INCORRECT? $$ \begin{array}{|l|l|l|l|l|l|l|l|} \hline \mathrm{P} & 22 & 89 & 50 & 45 & 78 & 60 & 39 \\ \hline \mathrm{Q} & 35 & 65 & 60 & 56 & 81 & 45 & 50 \\ \hline \end{array} $$
Q6. mcq single +2 / 0.67
In the triangle PQR , the lengths of PT and TR are in the ratio of $3: 2$. ST is parallel to QR. Two semi-circles are drawn with PS and PQ as diameters, as shown in the figure. Which one of the following statements is true about the shaded area PQS? Note: The figure shown is representative.
Q7. mcq single +1 / 0.33
What is the value of $\left(\frac{3^{81}}{27^4}\right)^{1 / 3}$ ?
Q8. mcq single +1 / 0.33
Each row of Column-I has three items and each item is represented by a circle in ColumnII. The arrangement of circles in Column-II represents the relationship among the items in Column-I. Identify the option that has the most appropriate match between Column-I and ColumnII. Note: The figure shown are representative.
Q9. mcq single +2 / 0.67
In the given figure, EF and HJ are coded as 30 and 80, respectively. Which one among the given options is most appropriate for the entires marked (i) and (ii)?
Power System Analysis

Power System Analysis

Q1. mcq single +2 / 0.67
In the system shown below, the generator was initially supplying power to the grid. A temporary LLLG bolted fault occurs at F very close to circuit breaker-1. The circuit breakers open to isolate the line. The fault self-clears. The circuit breakers reclose and restore the line. Which one of the following diagrams best indicates the rotor accelerating and decelerating areas?
Q2. numerical +2 / 0
Two units, rated at 100 MW and 150 MW , are enabled for economic load dispatch. When the overall incremental cost is $10,000 \mathrm{Rs}$./MWh, the units are dispatched to 50 MW and 80 MW respectively. At an overall incremental cost of $10,600 \mathrm{Rs} . / \mathrm{MWh}$, the power output of the units are 80 MW and 92 MW , respectively. The total plant MW-output (without overloading any unit) at an overall incremental cost of $11,800 \mathrm{Rs} . / \mathrm{MWh}$ is __________ (round off to the nearest integer)
Q3. numerical +1 / 0
Consider a distribution feeder, with $R / X$ ratio of 5 . At the receiving end, a 350 kVA load is connected. The maximum voltage drop will occur from the sending end to the receiving end, when the power factor of the load is __________ (round off to three decimal places).
Q4. mcq single +1 / 0.33
During a power failure, a domestic household uninterruptible power supply (UPS) supplies AC power to a limited number of lights and fans in various rooms. As per a NewtonRaphson load-flow formulation, the UPS would be represented as a
Q5. numerical +1 / 0
The bus impedance matrix of a 3-bus system (in pu) is $$ Z_{\text {bus }}=\left[\begin{array}{lll} j 0.059 & j 0.061 & j 0.038 \\ j 0.061 & j 0.093 & j 0.066 \\ j 0.038 & j 0.066 & j 0.110 \end{array}\right] $$ A symmetrical fault (through a fault impedance of $j 0.007$ p.u.) occurs at bus 2 . Neglecting pre-fault loading conditions, the voltage at bus 1 , during the fault is __________ p.u. (round off to three decimal places).
Electrical And Electronics Measurement

Electrical And Electronics Measurement

Q1. numerical +2 / 0
In the Wheatstone bridge shown below, the sensitivity of the bridge in terms of change in balancing voltage $E$ for unit change in the resistance $R$, in $\mathrm{mV} / \Omega$, is _________ (round off to two decimal places)
Q2. numerical +1 / 0
The maximum percentage error in the equivalent resistance of two parallel connected resistors of $100 \Omega$ and $900 \Omega$ with each having a maximum $5 \%$ error is ____________\%. (Round off to nearest integer value)