Newspapers are a constant source of delight and recreation for me. The trouble is that I read many of them
A. even, too
The missing number in the given sequence 343, 1331, , 4913 is
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A. 2744
The passengers were angry the airline staff about the delay.
A. towards
It takes two hours for a person X to mow the lawn. Y can move the same lawn in four hours. How long (in minutes) will it take X and Y, if they work together to move the lawn?
A. 120
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I am not sure if the bus that has been booked will be able to all the students.
A. sit
Given two sets X = {1, 2, 3} and Y = {2, 3, 4}, we construct a set Z of all possible fractions where the numerators belong to set X and the denominators belong to set Y. The product of element having minimum and maximum values in the set 7 is
A. 3/8
The ratio of the number of boys and girls who participated in an examination is 4: 3. The total percentage of candidates who passed the examination is 80 and the percentage of girls who passed is 90. The percentage of boys who passed is
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A. 80.50
An award-winning study by a group of researchers suggests that men are as prone to buying on impulse as women feel more guilty about shopping. Which one of the following statements can be inferred from the given text?
A. Some men and women indulge in buying on impulse
The mean-square of a zero-mean random process is , where k is Boltzmann's constant, T is the absolute temperature, and C is capacitance. The standard deviation of the random process is
A. kT/C
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The characteristic equation of a linear time- invariant (LTI) system is given by ?(s) = s4 + 3s³ + 3s² + s + k = 0. The system is BIBO stable if
A. 0 < k < 12/8
Consider five people - Mita, Ganga, Rekha, Lakshmi and Sana. Ganga is taller than both Rekha and Lakshmi. Lakshmi is taller than Sana. Mita is taller than Ganga. Which of the following conclusions are true?
- Lakshmi is taller than Rekha
- Rekha is shorter than Mita
- Rekha is taller than Sana
- Sana is shorter than Ganga
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A. 1 and 3
The inverse Laplace transform of for = 0 is
A. 2tet + e-t
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A 5 kVA, 50 V/100 V, single-phase transformer has a secondary terminal voltage of 95 V when loaded. The regulation of the transformer is
A. 9%
A three-phase synchronous motor draws 200 A from the line at unity power factor at rated load. Considering the same line voltage and load, the line current at power factor of 0.5 leading is
A. 400 A
A cv-axial cylindrical capacitor shown in Figure (i) has dielectric with relative permittivity er1 = 2. When one-fourth portion of the dielectric is replaced with another dielectric of relative permittivity ?r2, as shown to Figure (ii), the capacitance is doubled. The value of ?r2 is
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The parameter of an equivalent circuit of a three-phase induction motor affected by reducing the rms value of the supply voltage at the rated frequency is
G(s) = -0.25 s / (pe S)
In G(s) plane, the Nyquist plot of G(s) passes through the negative real axis at the point
A. (-0.5, j0)
A current controlled current source (CCCS) has an input impedance of 10 O and output impedance of 100 kO. When this CCCS is used in a negative feedback closed loop with a loop gain of 9, the closed loop output impedance is
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A. 100 KO
A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current is
A. 100 Hz
The current I flowing in the circuit shown below in amperes (round off to one decimal place) is
The partial differential equation azu / at² = c² (?²u / ?x² ?y²) = 0; where c ? 0 is known as
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A. Poisson's equation
The steady state value of y(t) is
A. 10/2
The open loop transfer function of a unity feedback system is given by
If f = 2x3 + 3yj + 4z, the value of line integral grade f. dr evaluated over contour C formed by the segments (-3, -3, 2) ? (2, -3, 2) ? (2, 6, 2) ? (1, 6, -1) is
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Five alternators each rated 5 MVA, 13.2 kV with 25% of reactance on its own base are connected in parallel to a busbar. The short-circuit level in MVA at the busbar is
Given Vgs is the gate-source voltage, Vds is the drain voltage, and Vth is threshold voltage of an enhancement type NMOS transistor, the conditions for transistor to be biased in saturation are
A. Vgs > Vth ; Vds = Vgs - Vth
The total impedance of the secondary winding, leads, and burden of a 5 A CT is 0.01 O. If the fault current is 20 times the rated primary current of the CT, the VA output of the CT is
The Ybus matrix of a two-bus power system having two identical parallel lines connected between them in pu is given as Yus = -j8 j20 bus j20 -j8. The magnitude of the series reactance of each line in pu (round off up to one decimal place) is
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A. 0.1
The rank of the matrix, M = 1 0 1 / 0 1 is
The symbols, a and quantities, and T(t) represents positive Impulse responses is NOT the output of a causal linear time-invariant system?
A. e-a(t - T)u(t)
is system transfer function H(s) = a1s² + b1s + C1 / a2s² + b2s + C2. If a1 = b1 = 0, and all other coefficients are positive, the transfer function represents a
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A. high pass filter
A 220 V (line), three-phase, Y-connected, synchronous motor has a synchronous impedance of (0.25 + j2.5) O/phase. The motor draws the rated current of 10 A at 0.8 pf leading. The rms value of line-to-line internal voltage in volts (round off to two decimal places) is
29. The closed loop line integral zz 37 dz
34. In the circuit below, the operational amplifier is ideal. If V1 = 10 mV and V2 = 50 mV, the output voltage (Vout) is
A. v3T
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30. The voltage across and the current through a load are expressed as follows v(t) = -170 sin(377t-V i(t) = 8 cos(377t+A The average power in watts (round off to one decimal place) consumed by the load is
31. A delta-connected, 3.7 kW, 400 V(line), three-phase, 4-pole, 50-Hz squirrel-cage induction motor has the following equivalent circuit parameters per phase referred to the stator: R1 = 5.39 O, R2 = 5.72 O, ?1 = ?2 = 8.22 O. Neglect shunt branch in the equivalent circuit. The starting line current in amperes (round off to two decimal places) when it is connected to a 100 V (line), 10 Hz, three-phase AC source is
A. 600 mV
35. In the circuit shown below, X and Y are digital inputs, and Z is a digital output. The equivalent circuit is a
A. XOR gate
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36. ? 0.1 µF capacitor charged to 100 V is discharged through a 1 kO resistor. The time in ms (round off to two decimal places) required for the voltage across the capacitor to drop to 1 V is
37. A periodic function f(t), with a period of 2n, is represented as its Fourier series, f(t) = a + n = 1 a, cosnt +? n = 1 bo sinnt. If
f(t) = { Asint, 0 = t = p / 0 p < t < 2p´
the Fourier series coefficients a1 and b1 of f(t) are
A. a1 = 0; b1 = ?/p
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38. If A = 2xi + 3yj + 4zk and u = x² + y² + z2, then div (uA) at (1, 1, 1) is
39. A moving coil instrument having a resistance of 10 O, gives a full-scale deflection when the current is 10 mA. What should be the value of the series resistance, so that it can be used as a voltmeter for measuring potential difference up to 100 V?
A. 9990 O
40. Consider a state-variable model of a system
where y is the output, and r is the input. The damping ratio ? and the undamped natural frequency Wn (rad/sec) of the system are given by
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?. ? = vß;? = va
42. The asymptotic Bode magnitude plot of a minimum phase transfer function G(s) is shown below.
Consider the following two statements.
Statement I : Transfer function G(s) has three poles and one zero.
Statement II: At very high frequency (? ? 8), the phase angle G ?G (j) = -37.
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Which one of the following options is correct?
A. Both the statements are true.
41. The enhancement type MOSFET in the circuit below operates according to the square law. unCox = 100 µ?/V², threshold voltage (VT) is 500 mV. Ignore channel length modulation. The output voltage Vout is
A. 600 mV
A single-phase transformer of rating 25 kVA, supplies a 12 kW load at power factor of 0.6 lagging. The additional load at unity power factor in kW (round off to two decimal places) that may be added before this transformer exceeds its rated kVA is
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44. Consider a 2 × 2 matrix M = [V1 V2], where. v1 and v2 are the column vectors. suppose M-1 = U where u and u are the row vectors. Consider the following statements :
Statement 1: u v1 = 1 and už v2 = 1
Statement 2: u v1 = 0 and u v1 = 0
Which of the following options is correct?
A. Both the statements are false
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45. A single-phase fully-controlled thyristor converter is used to obtain an average voltage of 180 V with 10 A constant current to feed a DC load. It is fed from single-phase AC supply of 230 V, 50 Hz. Neglect the source impedance. The power factor (round off to two decimal places) of AC mains is
46. A DC-DC buck converter operates in continuous conduction mode. It has 48 V input voltage, and it feeds a resistive load of 24 O. The switching frequency of the converter is 250 Hz. If switch-on duration is 1 ms, the load power is
A. 12 W
47. In a DC-DC boost converter, the duty ratio is controlled to regulate the output voltage at 48 V. The input DC voltage is 24 V. The output power is 120 W. The switching frequency is 50 kHz. Assume ideal components and a very large output filter capacitor. The converter operates at the boundary between continuous and discontinuous conduction modes. The value of the boost inductor (in µ?) is
48. A 220 V DC shunt motor takes 3 A at no- load. It draws 25 A when running at full- load at 1500 rpm. The armature and shunt resistances are 0.5 O and 220 respectively. The no-load speed in rpm (round off to two decimal places) is
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51. The probability of a resistor being defective is 0.02. There are 50 such resistors in a circuit. The probability of two or more defective resistors in the circuit (round off to two decimal places) is
52. The magnetic circuit shown below has uniform cross-sectional area and air gap of 0.2 cm. The mean path length of the core is 40 cm. Assume that leakage and fringing fluxes are negligible. When the core relative permeability is assumed to be infinite, the magnetic flux density computed in the air gap is 1 tesla. With same Ampere-turns, if the core relative permeability is assumed to be 1000 (linear), the flux density in tesla (round off to three decimal places) calculated in the air gap is
49. A fully-controlled three-phas bridge converter is working from a 415 V, 50 Hz AC supply. It is supplying constant current of 100 A at 400 V to a DC load. Assume large inductive smoothing and neglect overlap. The rms value of the AC line current in amperes (round off to two decimal places) is
50. The output expression for the Karnuaugh map shown below is
A. QR + S
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53. A 30 kV, 50 Hz, 50 MVA generator has the positive, negative, and zero sequence reactances of 0.25 pu, 0.15 pu, and 0.05 pu, respectively. The neutral of the generator is grounded with a reactance so that the fault current for a bolted LG fault and that of a bolted three-phase fault at the generator terminal are equal. The value of grounding reactance in ohms (round off to one decimal place) is
54. The line currents of a three-phase four wire system are square waves with amplitude of 100 A. These three currents are phase shifted by 120° with respect to each other. The rms value of neutral current is
?. ? ?
55. The transfer function of a phase lead compensator is given by
D(s) = (1 / 3s+ 3T) / (S + 17)
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The frequency (in rad/sec), at which ?D(jw) is maximum, is
A. v3T
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