1 Crore+ students have signed up on EduRev. Have you? Download the App 
Choose the word or phrase which is nearest in meaning to the key word Lethargy
Replace the phrase printed in bold to make it grammatically correct ?
"Even though many companies" are now penetrating rural India, it would help to give India a real chance of witnessing a double digit GDP growth.
Improve the sentence with suitable options by replacing the underlined word.
He is still in vigorous health although he is on the "right" side of sixty.
When a leadacid battery is in fully charged condition, the colour of its positive plate is
Determine the peak inverse voltage that appear across the diode in the given circuit.
During positive half cycle capacitor get charge and during negative half cycle the equivalent circuit is shown as
so, V_{D} = V_{m}Sinωt
so, P1V = 2V_{m}
here, V_{m} = 10 volt,
so, P1V = 20 volt
Determine the power dissipated across the load resistance R_{L} in the given circuit, assume diode is ideal.
Power dissipate across R_{L},
here, V_{rms} = 5/2
so,
= 125 mW
What is the load current I_{L} in the circuit shown below:
Apply KCL at node V_{1},
…..(1)
Apply KCL at node V_{2},
…..(2)
From equation (1) and (2)
Therefore,
= – 10mA
How many standard resistor are required to design a 3 bit flash type ADC?
Number of resistor, = 2^{n}
= 2^{3}
= 8
Determine the size of ROM required to implement a fullsubstractor.
For fullsubstractor, the number of input variable is 3 and output function are 2
So size of ROM,
2^{3} × 2
8 × 2
Determine the even part of the signal x(f) where x(t) = 4 Sin t
x(t) = 4 sint
Since the above signal is an odd signal therefore, its even part is zero.
An LTI system is characterized by difference equation y (n) = y (n1) x (n). The impulse response of the system is :
y(n) = y(n – 1) x(n)
⇒
Consider the signal x(t) = e^{2t} u(t). Let X(ω) denotes the Fourier transform of the signal, the value of the below equation is:
Since, ,
So,
Therefore
= 2π
In the given circuit, the forward threshold voltage of the diode is 0.
Given P_{Dmax} = 21 mW
So, I_{Dmax} = 21mW/0.7 = 30mA
For same operation,
50 – 0.7 <= 30 R
19.3 <= 30 R
R >= 643
So, only option (b) is satisfied.
When a bypass capacitor is connected across the emitter and resistance of a commonemitter BJT amplifier:
An amplifier using an opamp with a slew rate 1 V/μsec has a gain of 20 dB. If the peak value of sinusoidal input signal is 1 V then determine the maximum frequency of the input signal that can be amplify without any distortion.
For distortion less output,
2p f_{m} A_{f} V_{m} <= S.R
Here, A_{f} = 20dB
i.e, A_{f }= 10
So,
The skin depth of copper at a frequency of 6GHz is 1μm, the skin depth at a frequency of 24 GHz would be :
Skin Depth, δ =
If the current changes from 5A to 3A in 2 seconds and the inductance is 10H, calculate the emf.
We know that:
emf=L(i2i1)/t
Substituting the values from the question, we get emf=10V.
What is the capacitance when Q = 60 C and V = 12 V?
The surge impedance of a 400 KV, 100 Km Tline is 300for a 200 Km length, the surge impedance will be.
Because surge impedance of a Tline is independent on line length and frequency
The dielectric loss of a capacitor can be measured by which one of the following :
The value of the below integral is equal to
Evaluate, , where C represents a circle
,
Since pole z = 4 lies within the circe. So,
From his 9 friends (4 boys and 5 girls), Mohan wanted to invite friends for picnic. If there have to be exactly 3 girls in invites, then the number of ways in which he can invite them are,
Three girls can be selected from 5 girls in ^{5}C_{3 }ways. As number of boys to be invited is not given, hence out of 4 boys he can invite them in 2^{4} ways, so total of
2^{4} X ^{5}C_{3 }ways = 16 X =160 ways
A dice is rolled 5 times. The probability that 4 will show up exactly 3 times is:
Probability of getting four is,
P(4) = 1/6
So, Required Probability,
Determine V_{0} in the given circuit below
5V_{1 }= 20
V_{1} = 4 volt,
So, V_{0} = V_{1}
_{ }= 4 volt
The Yparameter of the circuit shown below :
Compare with standard π network,
In the circuit shown below, the switch is closed at t=0, determine
At t = 0^{ } the equivalent circuit is,
A voltage commutated chopper circuit operated at 500Hz is shown below. Find circuit turnoff time of main SCR and AuxSCR
Circuit turnoff time of
The value of δ(t) * 2δ(t1) * 3δ(t2) is
δ(t) * 2δ(t1) * 3δ(t2)
δ(t) * 6δ(t3)
6δ(t3)
The ROC of z transform of signal x[n] = (4)^{n} is
x(n) = 4^{n}
=
So,
ROC > 4 & ROC < 1/4
Since there is no any common ROC so, ztransform does not exist.
The system matrix of a continuous time system is described in the state variable form is,
The system is stable for
Matrix,
Characteristic equation,
For a stable system, all the elements in the first column of Routharray should be positive. In the given option, option (c) satisfy the criteria i.e., A < 0 and B < 1/2
The resin bonded paper bushings are designed to operate at a maximum radial stress of
The openloop transfer function of unity feedback control system is
.
The system is stable for
Characteristic equation
In the given logic diagram the propagation delays of both the gates are 20 nsec each. The output y is at logic ‘1’ from a long time and at t = 0, the input x change from 0 to 1, so the output goes momentary to logic 0, determine the time required by the output to again maintain its level at logic 1.
So output again becomes 1 after 40 nsec.
The logical expression realized by the circuit shown in the figure will be:
In the circuit A = 1, B = 1, Q_{n} = 0 and P_{n} = 1 what will be the output Q_{n 1} and P_{n 1} when the clock input (CK) is applied ?
For what value of damping parameter, the transient stability is assured by equal area criterion?
Equal area criterion is applicable only if damping is zero.
The current through the resistor R in the given circuit.
V_{1} = 2volt {Due to virtual short – circuit}
and
Since β is not given take it to be very large, iem
I_{E } = I_{c} = 10 mA
Determine the operating point of the BJT, in the given circuit.
V_{B} = 5 volt,
So, V_{E} = 5 – 0.7 = 4.3
I_{E} = mA = 1.075 mA
Now, V_{C} = 10 – 2 * I_{C}
= 10 – 2*1.075
= 7.85V
So, V_{CE} = V_{C} – V_{E}
= 7.85 – 4.3
= 3.55 V
In the circuit shown in the given figure, assume that the capacitor C is almost shorted for the frequency range of interest of the input signal. Under this condition, the voltage gain of the amplifier will be approximately.
Given h_{fe} = 100 & h_{ie} = 1K
It is common collector configuration (emitter follower) so voltage gain is almost equal to 1, in the given option A_{v} ≈ 1
For a Si transistor connected as shown in the fig. V_{BE} = 0.7V. Given that the reverse saturation current of the junction at room temperature is 200 nA, the I_{C} is given by
Since base is connected to collector of the transistor, therefore it works as a diode
I_{c} = I_{0}{e^{VBE/ηVT}1}
Here, I_{0} = 200 nA, V_{BE} = 0.7, η = 2, V_{T} = 26 mV
So, I_{c} = 147.86 mA
A 220 KV, three phase transmission line is 40 Km long. The resistance per phase is 0.15per Km and inductance per phase is 1.5923 mH per Km. The line is supplying a 3 phase load of 381 MVA at 0.8 power factor lagging. Find voltage at sending end will be (per phase)
Resistance of the line per phase for a length of 40 Km.
R = 0.15 X 40 = 6 Ohm
Similarly reactance of the line (40 Km) per phase.
X_{L} = 11.5293 X 40 = 63.69 mH
Receiving and voltage / phase
Load power factor = 0.8 lagging
I = =1000 Amp
Sending end voltage,
V_{S} = V_{r } IR cosφ IX_{L}sinφ
= 127 x 10^{3} 1000 x 6 x 0.8 1000 x 63.69 x 10^{3} x 0.6
= 170 KV
Magnetic flux density in certain medium with permeability μ_{r} is given by . The current density is given by
The current density,
Given field, Â = 3x^{2}yzâ_{x} x^{3}zâ_{y} (x^{3}y  2z)â_{z} It can be said that A is
Â = 3x^{2}yzâ_{x} x^{3}zâ_{y} (x^{3}y  2z)â_{z}
So the given field is conservative
A synchronous motor with negligible armature resistance at a load angle of 20° at rated frequency. If supply frequency is increased by 10% keeping other parameters constant the new load angle will be?
A variable speed drive rated for 1500 rpm, 40Nm, is reversing under noload. Figure shows the reversing torque and the speed during the transient. The moment of inertia of the drive is……….
A (0300)V Voltmeter has a guaranteed accuracy of 2% of full scale reading if the voltage measured by this instrument is 180V then the limiting error will be
Error = 2% of F.S.D.
= 2% of 300 V
= 2/100 x 300 = 6 V
Measured Value = 180 V
Error = 6 V
Absolute error = Measured value – True value
6 = 180  True value
Tue Value = 174 Volt
Limiting error or % error
= 6/174 x 100 = 3.44%
A fault current of 2000A is passing on the primary side of 400/5 CT on the secondary side of the C.T. an inverse time over current relay is connected whose plug setting is set at 50%. The PSM will be
The pickup value of the relay is 5A, since the relay setting is 50%
Therefore, The operating current of the relay is
5 x 50/100 = 2.5 A
If the voltage across the units in a 2unit suspension insulator is 60% and 40% respectively, of the line voltage. Determine the ratio of the capacitance of the insulator to that of its capacitance to earth.
From figure I = I_{1} I'_{1}
V_{2}wkc = V_{1}wkc V_{1}wc
V_{2}wkc = V_{1}wc (k 1)
0.6 Vkwc = 0.4 Vwc (k 1)
⇒ K = 2
A salient pole synchronous motor is running with normal excitation it the excitation is reduced to zero than?
because torque developed T = T_{Rl} T_{elect}
If ext^{n} zero electromagnetic zero by reluctance torque present incase of salient pole so it becomes reluctance motor.
Given a > 0, we wish to calculate the reciprocal value 1/a by Newton – Raphson method for f(x)=0 for a=7 and starting with X_{0} = 0.2, the first two iterations would be :
Here, Let
⇒
Therefore,
After Simplification,
For a = 7
Here x_{0} = 0.2
So x_{1} = 2 x 0.2  7 (0.2)^{2}
= 0.12
and second iteration
x_{2} = 2x_{1}  7x_{1}^{2}
= 2 x 0.12  7 (0.2)^{2}
x_{2} = 0.1392
For what values of 'k' will the pair of equations 3x + 4y = 12 and kx + 12y = 30 NOT have a unique solution?
The matrix is decomposed into a product of a lower triangular matrix [L] and an upper triangular matrix [U]. The properly decomposed [L] and [U] matrices respectively are
f(x) = 2x^{3}  15x^{2} + 36x + 1 is increasing in the interval given below, choose the correct option.
22 docs274 tests

22 docs274 tests
