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This mock test of Gate Mock Test: Electrical Engineering(EE)- 10 for GATE helps you for every GATE entrance exam.
This contains 65 Multiple Choice Questions for GATE Gate Mock Test: Electrical Engineering(EE)- 10 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

“Nobody praised her ________ nature, so she decided to mend her ways to become ________.”

The words that best fill the blanks in the above sentence are

Solution:

‘__complaisant__’- willing to please or oblige others

‘__complacent__’- self-satisfied, unconcerned

Thus, the sequence in option 3 must be used to make the sentence contextually sensible.

QUESTION: 2

“All the development programmes of the government have been ________ over the years by the perpetual rise in the population of the country.”

Solution:

‘vitiate’- to make faulty or defective, hurt

‘ratify’- to approve and sanction formally

The sentence implies that the ever-increasing population of the country is posing a hindrance to all the developmental programmes initiated by the government.

Hence, option 1 is the correct answer.

QUESTION: 3

D = ABC + BCA + CAB where A, B and C are decimal digits, then D is divisible by

Solution:

D = ABC + BCA + CAB

= (100 A + 10 B + C) + (100 B + 10 C + A) + (100 C + 10 A + B)

= 111 (A + B + C)

So, D is a multiple of 111.

111 is divisible by 37 but not divisible by 29. Thus, D is divisible by 37 but not divisible by 29.

QUESTION: 4

In an examination 100 questions of 1 mark each are given. After the examination, 20 questions are deleted from evaluation, leaving 80 questions with a total of 100 marks. Student A had answered 4 of the deleted questions correctly and got 40 marks, whereas student B had answered 10 of the deleted questions correctly and got 35 marks. In this situation,

Solution:

In an examination 100 questions of 1 mark each are given.

After the examination, 20 questions are deleted from evaluation.

Now, total number of questions considered for evaluation = 80

Marks for each correct question = 100/80 = 1.25

**Student A:**

Total marks secured = 40

Number of questions answered correctly = 40/1.25 = 32

Student A had answered 4 of the deleted questions correctly

Number of questions answered correctly before the deletion of 20 questions = 32 + 4 = 36

Marks as per 100 question paper = 36

**Student B:**

Total marks secured = 35

Number of questions answered correctly = 35/1.25 = 28

Student A had answered 10 of the deleted questions correctly

Number of questions answered correctly before the deletion of 20 questions = 28 + 10 = 38

Marks as per 100 question paper = 38

**Conclusion: **B lost more than A.

QUESTION: 5

Two solutions of X and Y containing ingredients A, B and C in proportions a : b : c and c : b: a, respectively are mixed. For the resultant mixture to have A, B and C in equal proportion. It is necessary that

Solution:

The ratio of ingredients A, B and C = a : b : c

Let x be the factor.

The quantity of A in the solution X = ax

The quantity of B in the solution X = bx

The quantity of C in the solution X = cx

**Solution - Y:**

The ratio of ingredients A, B and C = c : b: a

Let x be the factor.

The quantity of A in the solution Y = cx

The quantity of B in the solution Y = bx

The quantity of C in the solution Y = ax

**Mixture Solution:**

The quantity of A in the mixture solution = (a + c)x

The quantity of B in the mixture solution = 2bx

The quantity of C in the mixture solution = (a + c)x

The ratio of ingredients A, B and C = (a + c)x : 2bx : (a + c)x = (a + c) : 2b : (a + c)

It is given that, the resultant mixture to have A, B and C in equal proportion.

⇒ 2b = a + c

QUESTION: 6

In the given diagram of Testbook team, contents are represented in the parallelogram, technical in the rectangle and DTP in the triangle. Out of the total number of the people, the percentage of content shall be in the range of ________.

Solution:

Total number of people in content = total number of people in rectangle

Total number of people in rectangle = 18 + 50 + 25 = 93

Total number of people in Testbook team = 152

Hence the answer the is **61 to 75**

QUESTION: 7

How many pairs of positive integers m, n satisfy 1/m + 4/n = 1/12 where n is an odd integer less than 60?

Solution:

Since m and n are both positive and their sum is equal to

Hence the value of both there fractions must be less than

Therefore n-can take values > 48 and odd

N = {49, 51, 53, 55, 57, 59}

Now we have to check which values of ‘n’ will give integral values of ‘m’.

Equation:

For m to be on integer (n - 48) should be a multiple of 12n

The above condition is satisfied for

N = 49, 51, 57

Corresponding values of m

N = 49

M = 12 × 49

N = 51

QUESTION: 8

Most successful professional football players began playing football as youth, though a significant number learned the sport later in life. No professional football player who ignored the advice of his coaches, however, has ever become successful. If the statements are true, which of the following must also be true?

Solution:

According to the second sentence of the passage, a necessary condition for being a successful professional football player is not ignoring the advice of coaches.

So all of the successful professional football players mentioned in the passage’s first sentence, including those who played the sport as youths, do not ignore the advice of coaches. That’s what correct answer states.

*Answer can only contain numeric values

QUESTION: 9

The diagram shows a circle with one equilateral triangle inside and one equilateral triangle outside. The ratio of areas of big triangle to the small triangle is n :1. Find the value of n.

Solution:

Rotating the smaller triangle by 180°, we get the following figure.

From symmetry we can say R is the midpoint of BC.

So P and Q are also mid points of AB and AC

From the midpoint theorem:

Since two equilateral tringles are also similar triangle we know

*Answer can only contain numeric values

QUESTION: 10

The following hydrograph depicts the rainfall intensity of an area for the time period of 8 hours. Also, infiltration curve is plotted on the same graph for the given land characteristics. Hydrograph region below the infiltration curve represents infiltrated portion of rainfall. Calculate the excess of rainfall occurred.

Solution:

The region above the infiltration curve represents the excess of rainfall.

∴ Excess rainfall = Area of the hydrograph above infiltration curve.

Area of hydrograph above infiltration curve (A) is given by

∴ Excess rainfall is 11 mm.

QUESTION: 11

Which of the following expression represents the given logic circuit?

Solution:

= A̅ B̅ C + ABC

⇒ Y = (A̅ B̅ + AB) C

⇒ Y = C(A⊙B) = C(A̅⊙B̅)

QUESTION: 12

In figure, the balancing component of current is _____ A

Solution:

We see that both current shown in the figure enter their respective winding at dots. so, for ampere turn balance

*Answer can only contain numeric values

QUESTION: 13

A Transformer is rated at 100 KVA. At full load its copper loss is 1200 W and its iron loss is 850 W. Calculate the load (in KVA) at which maximum efficiency will occur.

Solution:

*Answer can only contain numeric values

QUESTION: 14

Two transformers operating in parallel having impedance of 6 % and 4 %. If the total load supplied by the combinations is 100 A, then the current supplied by 6 % impedance transformer _______ A.

Solution:

This question is based on load sharing

By using current division rule

However, if the impedance is in PU then their PU value should be converted on a common base to ensure that the ohmic ratio remain unchanged.

QUESTION: 15

Let x(t) = 1 – 2t. Then what is the value of where δ(t + 1) is unit impulse at t = -1.

Solution:

From the property of unit pulse function,

QUESTION: 16

what is the inverse Laplace transform of the product F_{1}(s) . F_{2}(s)?

Solution:

F(s) = F_{1}(s) . F_{2}(s)

By using partial fractions,

By applying inverse Laplace transform,

QUESTION: 17

Latching current for an SCR, inserted in between a dc voltage source of 300 V and the load, is 150 mA. Compute the minimum width of gate pulse current required to turn-on this SCR in case the load of L = 0.3 H in series with R = 30 Ω

Solution:

1 – e-100t = 0.015

-e-100t = 0.985

-100t = -0.01511

t = 151.136 μsec

*Answer can only contain numeric values

QUESTION: 18

A step-up chopper shown in figure is to deliver 3A

In to the 10 Ω load. The battery voltage is 12 V, L = 20 μH, C = 100 μF and chopper frequency is 50 kHz. Determine the on-time of the chopper ________ μs

Solution:

**Calculation:**

V_{o} = I_{o}R_{L} = 3 × 10 = 30 V

V_{b} = V_{o} (1 – D)

On time = T_{ON} = DT = 0.6 × 20 × 10^{-6} = 12 μs

When the transistor is switched on, current ramps up in the inductor and energy is stored.

When the transistor is switched off, the inductor voltage reverses and acts together with the battery voltage to forward bias the diode, transferring energy to the capacitor.

When the transistor is switched on again, the load current is maintained by the capacitor, energy is stored in the inductor and the cycle can start again.

The value of the load voltage is increased by increasing the duty cycle or the on-time of the transistor.

During the transistor on-period, assuming an ideal inductor and transistor

V_{b} = V_{L} = Ldi/dt

V_{b}/s = (sL) i(s)

i(s) = V_{b}/s^{2}L

i(t) = (V_{b}/L)t = kt

Over an on-time of T_{ON}, the change of battery current will be

Δi = k T_{ON}

During the off-period

V_{o }= V_{b} + V_{L }= V_{b} + L(di/dt) = V_{b} + L(Δi/Δt)

= V_{b} + L(V_{b}/L)T_{ON} /T_{off} = V_{b}(1 + T_{ON} /T_{off})

Let the duty cycle

D = T_{ON} T, and T_{off} = T – T_{ON} = T(1 - D). Now

V_{o} = V_{b} (1 – DT/T(1 – D))

which simplifies to

V_{o} = V_{b}/(1 - D)

In an ideal circuit, V_{b}I_{b }= V_{0}I_{0}. Therefore, from eq.

I_{b} = (V_{o}/V_{b})I_{b} = I_{o}/(1 – D)

I_{b} = I_{b} + Δi/2

I_{bo} = I_{b} – Δi/2

When the steady variation of battery current has been reached, the variation will be between l_{o} and I_{1}, as shown in.

QUESTION: 19

For the circuit, shown in the figure below, the values of i_{0} and i_{1} respectively are

Solution:

By applying voltage division in the input loop,

i_{0} will be zero, as there is no closed path.

By applying KCL in the right-side circuit,

As 10 Ω and 5 Ω are connected in parallel, voltage across them are equal.

⇒ 10 i_{1} = 5 i_{2} ⇒ i_{2} = 2i_{1} ----(2)

From equation (1) and (2)

i_{1} + 2i_{1} = -3 ⇒ i_{1} = -1 A

QUESTION: 20

For the two – port circuit shown in the figure, the S – domain expression for the parameter d is where

Solution:

The s-domain circuit for the given circuit is

When V_{2} = 0

By applying KVL in the second loop

sI_{2}(s) + 4 (I_{1}(s) + I_{2}(s)) = 0

⇒ 4 I_{1} (s) + (s + 4) I_{2}(s) = 0

QUESTION: 21

Match List-I (Transfer function of the system) with List-II (Type and order of the system) and select the correct answer using the codes given below the Lists:

Solution:

Type of the system indicates the number of poles at origin.

Order of the system indicates the total number of poles.

QUESTION: 22

The feedback system shown below is stable for all values of K given by

Solution:

Characteristic equation,

1 + G(s)H(s) = 0

⇒ s(s + 1)(s + 6) = 0

⇒ s^{3} + 7s^{2} + 6s + K = 0

Routh array:

For the system to be stable, there should be no sign change in the first column of Routh array.

QUESTION: 23

A 60 μA meter has a resistance of 100 ohms. If the meter has to measure 100 mA, then the value of shunt resistance and the current through shunt respectively are

Solution:

Given that, current through meter (I_{m}) = 60 μA

Total required current (I) = 100 mA

Meter resistance (R_{m}) = 100 Ω

Current flows though shunt resistance

I_{sh} = I - I_{m}

= 100 × 10^{‑3} – 60 × 10^{-6}

= (100 – 0.06) × 10^{-3}

= 99.94 mA

QUESTION: 24

In the measurement of power by 3 voltmeter method connected as shown below. The expression for power consumed in the load is given by

Solution:

Power consumed in the load,

PL = V_{3} I_{L }cos θ

V_{1} = I_{L}R

QUESTION: 25

The output of the 4 to 1 MUX shown in the below figure is

Solution:

QUESTION: 26

Find VD_{S} under DC condition of the given circuit

Given r_{d} = 15 KΩ, I_{DSS} = 20 mA, V_{p} = -10V

Solution:

Given:

V_{GS} = -6V

V_{DS} = V_{DD} – I_{D}R_{D} = 40 – 3.2 × 3 = 30.4 V

*Answer can only contain numeric values

QUESTION: 27

What is the output voltage Vo (in Volt)of the given circuit?

Solution:

Voltage at A point V_{A} = 4 × 4 = 16 V

By using virtual short circuit condition V_{A} = V_{B} = 16 V

Voltage droop across feedback resistance V_{4kΩ} = 4 × 4 = 16 V

Output voltage V_{o} = 16 + 16 = 32 V

*Answer can only contain numeric values

QUESTION: 28

A 30 kV, 50 Hz, 60 MVZ generator has the positive negative and zero sequence reactance of 0.2 pu, 0.15 pu and 0.05 pu respectively. The generator ground with a reactance of 0.05 pu. The fault current magnitude for a single line to ground fault is ________(in pu)

Solution:

Given that, Z_{1} = 0.2 pu

Z_{2} = 0.15 pu

Z_{0} = 0.05 pu

Z_{n} = 0.05 pu

For a G fault, fault current is given by

QUESTION: 29

The distribution system shown in the figure is to be protected by over current system of protection. For proper fault discrimination, directional over current relays will be required at which locations?

Solution:

Directional relays are not required at supply side and at radial feeders as the power flow unidirectional but not bidirectional.

so, the directional over-current relays will be required at 2 and 3 only.

QUESTION: 30

In a four-bus system the total self-admittance of bus 2 is Y_{22} = -j14 p.u. A transmission line having a series reactance of j 0.2 p.u. and shunt capacitance of j 0.5 p.u. is connected between buses 2 and 3. The magnitude value of y_{22 }modified is________

Solution:

y_{22(old)} = -j 14 p.u

Z_{23} = j 0.2 p.u

y’_{23} = -j5 p.u

y_{22} = -j 14 – j5 + j 0.25

= -j 18.75 p.u.

QUESTION: 31

A fair die is rolled two times independently. Given that the outcome on the first roll is 1, the expected value of the sum of the two outcomes is

Solution:

Let X is a random variable represents an event of rolling a die and P(X = x_{i}) represents the probability of getting sum as x_{i}.

While rolling a die, the probability of getting different numbers as follows.

QUESTION: 32

A curve is given by x^{2} + 2y^{2} = 16 is revolved around x axis. The volume of solid generated is

Solution:

*Answer can only contain numeric values

QUESTION: 33

Consider a function f(x, y, z) = x^{2}yz + 3xy^{2}. The greatest rate of increase of function f at point (2, 1, -1) is

Solution:

Greatest rate of increase of function f is directional derivative at that point.

∇f = (2xyz + 3y^{2}) i + (x^{2}yz + 6xy) j + x^{2}y k

At the given point (2, 1, -1), ∇f = -i + 8 j + 4 k

Greatest rate of increase

*Answer can only contain numeric values

QUESTION: 34

If a 3 × 3 square matrix A has the eigen values 3, 4 and 5, then the determinant of adjoint of matrix A is

Solution:

Given that, Eigen values of a matrix A = 3, 4 and 5

From the properties of Eigen values, determinant of a matrix is equal to the product of their Eigen values.

⇒ |A| = 3 × 4 × 5 = 60

|Adj A| = |A|^{n-1 }= |A|^{2} = 60^{2} = 3600

*Answer can only contain numeric values

QUESTION: 35

In a lot of 600 solenoids 30 are defective. Find the probability that at least one is defective in a random sample of 24 solenoids.

Solution:

Probability that solenoid is defective

The probability that solenoid is not defective = 1 – 0.05 = 0.95

Since 24 samples are there, the probability of zero defectives will be

The probability that at least one is defective = 1 - the probability of zero defectives

= 1 – 0.292 = 0.708

The answer is in between 0.65 and 0.75

*Answer can only contain numeric values

QUESTION: 36

What is the value of the departure angle of root locus from the complex pole at s = -2 + j for

Solution:

Angle of departure is given by,

θ_{D} = 180° + ∠G(s)H(s) (or) 180° - ϕ

ϕ = (∠ poles - ∠ zeros) of G(s)H(s)

θ_{D} = 180° - 90 – (π – tan^{-1} (2))

= -90 + tan^{-1}(2) = -26.56

QUESTION: 37

The steady state error due to a unit-step disturbance input D(s) in figure is

Solution:

We need to find e_{ss} due to D(s).

So, R(s) = 0, the reduced block diagram will be

*Answer can only contain numeric values

QUESTION: 38

The state space representation of a system is given by

Then the impulse response of the system at t = 1 sec is ___

Solution:

Transfer function for a given state space representation is, C[sI - A]^{-1} B + D

Impulse response = L^{-1}[T/F] =

At t = 1sec, impulse response = 1

*Answer can only contain numeric values

QUESTION: 39

A single-phase half wave converter is operated from 220 V, 50 Hz source and the load resistance R = 12 Ω, For the firing angle delay 60° determine The RMS Voltage.

Solution:

QUESTION: 40

A DC series motor chopper drive has the following parameters:

Battery voltage = 100 V

R_{a} + R_{f} = 0.1 Ω

Motor velocity constant (k_{V}) = 10 mV/A -rad/sec

Chopper frequency = 130 Hz

Calculate the armature speed with an average armature current of 100 A and a chopper on-time of 6 ms.

Solution:

V_{avg} = V_{b} T_{on} f = 100 × 6 × 10^{-3} × 130 = 78 V

E = V_{a} – I_{avg} × R = 78 – (100 × 0.1) = 68 V

E = k_{V }I_{avg} ω

*Answer can only contain numeric values

QUESTION: 41

A three – phase half-controlled thyristor converter has a highly inductive load of 10 Ω, and a supply of 240 V at 50 Hz. Determine average power (in kW) for firing angle delay of 30°.

Solution:

QUESTION: 42

A 230 V. dc single phase bridge inverter is connected to load R = 12 Ω and L = 0.04 H Determine the RMS value of third harmonic for quasi-square wave output with an on -period of 0.5 of a cycle

Solution:

For quasi – square wave

2d = 0.5 × 180° = 90°

d = 45°

RMS value of fundamental voltage

Load impedance at third harmonic frequency is

RMS value of third harmonic

QUESTION: 43

Consider the AC bridge shown below. If ωRC = 1 and is approximately equal to

Solution:

QUESTION: 44

The given rectifier circuit has a source voltage of 150 sin ωt, and a load resistor of 40 Ω. Determine the average load current, if the thyristors are fired at ωt = 30°

Solution:

QUESTION: 45

The circuit shown in the figure below uses ideal positive edge-triggered synchronous J-K flipflops with outputs Q_{0}Q_{1}Q_{2}. If the initial state of initial state of output is Q_{0} = 0, Q_{1} = 1, Q_{2} = 0 just before the arrival of the first clock pulse, the state of the output just before the arrival of third clock pulse is

Solution:

J_{0} = K_{0} = 1

J_{1} = K_{1} = Q_{0}

J_{2 }= K_{2} = Q_{0}Q_{1}

Initial value of Q_{0}Q_{1}Q_{2} = 010

The state just before the third clock pulse is the state at the end of second clock pulse.

At the end of second clock pulse

= Q_{0}Q_{1}Q_{2} = 001

QUESTION: 46

A 3 phase, 6 pole star connected alternator revolves at 1000 rpm. The stator has 90 slots and 8 conductor per slot. The flux per pole is 0.05 wb. Calculate phase voltage generated by the machine if the winding factor is 0.96.

Solution:

Pole = 6, conductor/slot = 8, flux = 0.05

Winding factor K_{W} = 0.96, speed = 1000 RPM

Number of conductor z = slot × conductor/slot = 90 × 8 = 720

E_{ph} = 4.44 K_{c} K_{d} f N = 4.44 × 0.96 × 0.05 × 50 × 120 = 1278.72 V

*Answer can only contain numeric values

QUESTION: 47

A 6 pole, 3ϕ , 440 V – 50 Hz induction motor has the rotor impedance of [0.2 + j1.6] Ω, The ratio of the stator of rotor turn is 1.8 and the full load slip is 0.06. The full load torque is ________ N – m

Solution:

*Answer can only contain numeric values

QUESTION: 48

A DC shunt motor takes an armature current of 110 A at 480 V. The armature resistance is 0.2 Ω, the machine has 6 poles, and armature is lap connected with 860 conductors. The flux per pole is 0.05 wb, calculated torque developed (N-M) by the armature

Solution:

Back emf E_{b} = V – I_{a}R_{a} = 480 – 110 × 0.2 = 458 V

where Z = 860

For lap winding A = P = 6

Flux ϕ = 0.05

*Answer can only contain numeric values

QUESTION: 49

A 400 MVA, 33 kV synchronous generator is tested for O.C.C and S.C.C the following data are obtained from these characteristics: I_{f} = 1080 A, V_{CC} = 33 kV, I_{SC} = 12.3 kA calculate X_{s} in PU

Solution:

QUESTION: 50

The sampled signal has z-transform

Which of the following time-domain signals does it represents?

Solution:

Let the signal represents ramp function

r(t) = t u(t)

signal is sampled at t = T

s(n) = r(nT)

= nT u(nT) = nT u(n)

By applying z-transform

QUESTION: 51

For the Fourier transform X(jω) shown in figure, evaluate the value of

Solution:

*Answer can only contain numeric values

QUESTION: 52

The power supplied by the 40 V source in the circuit shown in the figure is _____(in W)

Solution:

By applying Delta to star conversion as shown below:

Now the given circuit becomes,

Power supplied by 40 V source = 40 × 0.5 = 20 W

*Answer can only contain numeric values

QUESTION: 53

For the circuit shown in the figure below, the maximum average power delivered to the load of V_{g} = 80 cos 5000 t V is _____(in W)

Solution:

Maximum average power delivered to the load, when

R = 40 Ω

X_{L} = jωL = j (5 × 10^{3}) (8 × 10^{-3}) = 40 j Ω

Now the Thevenin circuit will be

|I_{rms}| = 1 A

Average power delivered = (1)^{2} (20) = 20 W

*Answer can only contain numeric values

QUESTION: 54

In the voltage divider circuit shown in figure the no-load values of Vo is 4V. When the load resistance RL is attached across the terminal a and b, Vo drops to 3V. The value of RL in ohms is ______

Solution:

Circuit under no-load condition

By voltage division

⇒ 5R_{2} = 40 + R_{2} ⇒ R_{2} = 10 Ω

The circuit with load R_{L},

Let the parallel combination of R_{2} and R_{L} is R_{eq}.

By voltage division,

*Answer can only contain numeric values

QUESTION: 55

Find the value of DC current I_{E} in (mA) for the given circuit shown in figure

V_{BE} = 0.7, r_{e} = 25mV/I_{E}, B = Very large

Solution:

The Thevenin equivalent circuit for DC model is

Since B is very large, therefore I_{B} is small and can be ignored.

*Answer can only contain numeric values

QUESTION: 56

The switch in the circuit shown in the figure has been in position 1 for a long time. At t = 0 the switch moves instantaneously to position 2. Find the value of R (in ohms) so that 10% of the initial energy stored in the 10 mH inductor is dissipated in R in 10 μs.

Solution:

QUESTION: 57

Given figure shows an electromagnet to lift a load of W gram. Assume infinite permeability for iron. The ampere turns of the exciting coil to maintain an equilibrium at an air gap of x mm would be given by

Solution:

Force due to weight = Wg

Force due to electromagnet = 2F_{e
}

Magnetic field in air gap,

B_{g} = μ_{0}H_{g}

Ampere turn, NI = H_{g}. x

*Answer can only contain numeric values

QUESTION: 58

A solenoid is 100 cm long, 5 cm in diameter and consists of 1200 turns. The cylindrical core has a relative permeability of 60. This coil is co-axial with another solenoid 120 cm long, 6 cm diameter and 1000 turns. The mutual inductance between these two co-axial coils would be ____ (in mH)

Solution:

Given that, μ_{r} = 60

N_{1} = 1200

N_{2} = 1000

d_{1} = 5 cm ⇒ r_{1} = 2.5 cm

l = 100 cm

*Answer can only contain numeric values

QUESTION: 59

An alternator rated at 6.6 kV protected by balanced circulating current system has its neutral grounded through current system has its neutral grounded through a resistance of 10 Ω. The protective relay is set to operate when there is out of balance current of 1 A in pilot wires which are connected to secondary winding of 800/5 ratio current transformer. The percentage of winding which remains unprotected is______

Solution:

Let x% be the percentage of winding which remains unprotected

The voltage of unprotected winding

QUESTION: 60

The industry load or a three phase 2200 volts supply line is 1200 kW at a lagging power factor of 0.6. In order to raise the line power factor to unity (neglecting all the losses) What is the kVA rating of a synchronous condenser installed in parallel with the load and the kVA rating of an alternator required to supply the new total load?

Solution:

Reactive power absorbed by load

Q = P tan ϕ

= 1200 × tan (cos^{-1} (0.6))

= 1600 kVAR

At unity power factor, reactive power requirement = 0

Rating of synchronous condenser = 1600 kVAR

Rating of alternator = 1200 kVA

QUESTION: 61

Evaluate where C is the circle: |z| = 4

Solution:

[Sum of residues at poles]

Poles: z = 0, 3

Both the poles are inside the |z| = 4

Residue at z = 0,

*Answer can only contain numeric values

QUESTION: 62

The value of and C is the curve x^{2} = 4y and y^{2} = 4x is _____.

Solution:

The given integral is in the form of M dx + N dy

By using Green’s theorem,

*Answer can only contain numeric values

QUESTION: 63

In the differential equation is solved using the Euler’s method with step size h = 0.1, then y(1.2) is equal to (round off to 2 places of decimal)

Solution:

Given that, y

y(1) = 2 ⇒ y_{0} = 2, x_{0} = 1

h = 0.1

According to Euler’s method, y

**First iteration:**

y_{0} = 2, x_{0} = 1, h = 0.1

y

y

**Second iteration:**

y_{1} = 2.22, x_{1} = x_{0} + h = 1 + 0.1 = 1.1, h = 0.1

y

y

*Answer can only contain numeric values

QUESTION: 64

Consider the 2 × 2 matrix What is the maximum value of x, for which both the Eigen values of matrix are real and positive?

Solution:

⇒ (2 – λ) (4 – λ) – 3x = 0

⇒ λ^{2} – 6λ +8 – 3x = 0

Roots of the above equation are Eigen values and let the Eigen values be λ_{1} and λ_{2}

From the properties of Eigen values,

For the Eigen values to be positive, λ_{1}λ_{2 }> 0

⇒ 8 – 3x > 0

⇒ x < 8/3

For roots to be real,

⇒ 36 – 32 + 12x > 0

⇒ x > -1/3

The range of for which Eigen values of matrix are real and positive is:

Maximum value of x = 8/3 = 2.67

QUESTION: 65

The particular integral of

Solution:

Particular integral is,

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