Recommended: TS PGECET Previous Papers
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 Answered
 Review

Question 1 of 97
1. Question
If λ is an eigen value of A, the the eigen value of adjoint of A is

Question 2 of 97
2. Question
If u = x(1y), v = xy, then δ(u, v)/ δ(x, y) =

Question 3 of 97
3. Question
The real and imaginary parts of a complex analytic function are

Question 4 of 97
4. Question
If r_{yx} and r_{xy} are the regression coefficients of y on x and x on y then the coefficient of correlation is

Question 5 of 97
5. Question
At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because

Question 6 of 97
6. Question
If a bias voltage of V_{t} (in Volts) is applied to a forward biased silicon PN junction diode with a non ideality coefficient of 2, the diode current (in Amps) shall be

Question 7 of 97
7. Question
The threshold voltage of an n channel enhancement mode MOSFET is 0.5V when the device is biased at a gate voltage of 3V. Pinch off would be occurs at a drain voltage of

Question 8 of 97
8. Question
If CS = A_{15}A_{14}A_{15},A_{12} (and its value is 0111) is used as the chip select logic of A 4K RAM in an 8085 system then its memory range will be

Question 9 of 97
9. Question
Which of the following instructions is not available in 8085 microprocessor?

Question 10 of 97
10. Question
Assertion (A) : Wein bridge oscillator is generally used as a variable audio frequency oscillator
Reason (R) : by using either capacitor (or) resistor in one of the arms of the bridge, the frequency of a wein bridge oscillator can be varied

Question 11 of 97
11. Question
The internal resistances of an ideal current source, and an ideal voltage source are, respectively,

Question 12 of 97
12. Question
The equation i(0 +) = i(0 – ) = some finite value, where the notations and symbols have usual meanings (as adopted in transient response analysis of circuits ) holds good in the case of

Question 13 of 97
13. Question
A series RC circuit has constant value of R and varying value of C. The current locus with constant applied voltage V at constant frequency, as C is varied, is a semi circle with centre at

Question 14 of 97
14. Question
The current through a linear timeinvariant inductor with inductance L = 10^{3} is given by i_{L} = 0.1 sin 10^{6} t. The voltage across the inductor is

Question 15 of 97
15. Question
Which of the following are known as the short circuit parameters of a 2 port network?

Question 16 of 97
16. Question
The line current in a balanced delta system is 30 A. The load current is

Question 17 of 97
17. Question
Possible maximum value of mutual inductance between two coils of self inductances, L_{1} and L_{2} is

Question 18 of 97
18. Question
The resistance required for critical damping in a series RLC circuit is

Question 19 of 97
19. Question
The impedance of a series resonant circuit, at half power frequencies, is

Question 20 of 97
20. Question
The magnetic field intensity at the centre of a current carrying coil of diameter d m is H). The current flowing in the coil is

Question 21 of 97
21. Question
Two infinite plane sheets of charge with densities of +σ and – σ C/m^{2} are placed parallel to each other with a separating distance of d metres. The value of electric field intensity at a point exactly midway between the plane sheets is

Question 22 of 97
22. Question
Which of the following statements is not characteristic of a static magnetic field?

Question 23 of 97
23. Question
Integration of step signal gives

Question 24 of 97
24. Question
The period of the function Cos (π/10) (t – 3) is

Question 25 of 97
25. Question
If f(t) = f(t), and f(t) satisfies Dirichlet’s conditions, then f(t) can be expanded in a Fourier series containing

Question 26 of 97
26. Question
Minimum sampling rate required to avoid aliasing when the signal 10 Cos 400 πt is sampled is

Question 27 of 97
27. Question
The Fourier transform of f(t) is F(ω). Then, the Fourier transform of f(at), where a is a constant is given by

Question 28 of 97
28. Question
Laplace transform of Cos t is

Question 29 of 97
29. Question
The continuous time signal sin 25 πt + sin 80 πt requires a Nyquist rate of

Question 30 of 97
30. Question
Consider the following systems :
 a normal human being walking on the road, and
 servomechanism.
Systems (i) and (ii) are, respectively,

Question 31 of 97
31. Question
The transfer function of a system is 10/ s(s+1)(s^{2} + 3s + 2). The steady state errors exhibited by the system, to (i) step, (ii) ramp, and (iii) parabolic input are, respectively.

Question 32 of 97
32. Question
System 1 : The first column of the RH array consists of the terms 6,3,9,2, and 4.
System 2 : The first column of the RH array consists of the terms 3,6,9,2, and 4.The number of unstable poles for system1, and system 2, are respectively,

Question 33 of 97
33. Question
A second order system shows 100% overshoot in its unit step response. It can be categorized as

Question 34 of 97
34. Question
A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system

Question 35 of 97
35. Question
A certain control system has to open loop transfer function given by 10(s+3)(s+5)/ s(s+7)(s+9). Which portions of the real axis, among the ones given below, are parts of the root locus?

Question 36 of 97
36. Question
The open loop transfer function of a unity negative feedback control system is 10/ s^{2}(7s+1). The TYPE number and order of the closed loop system are, respectively

Question 37 of 97
37. Question
The transfer function of a system is given by 1/ (1+T_{1}s)(1+T_{2}s). A controller of the form K(1+T_{2}s)/(1+T_{4}s) is used to improve the performance of the system when operated in closed loop with unity feedback. The rise time in the unit step response can be reduced by choosing

Question 38 of 97
38. Question
In the state variable representation of systems, let A denote the system characteristic matrix, and let Ø(t) denote the state transition matrix. Then, which of the following is not a property of the state transition matrix?

Question 39 of 97
39. Question
Observability of a system is essential for

Question 40 of 97
40. Question
Time constant of a first order system is defined as the time taken to reach x% of the final steady state value in the step response. The value of x is

Question 41 of 97
41. Question
In TorqueVoltage analogy, the Moment of Inertia of a mechanical rotational system is analogous to

Question 42 of 97
42. Question
The bridge most suited for accurate measurement of relative permittivity of dielectric materials is

Question 43 of 97
43. Question
The operation of a ramp type Digital Voltmeter is based on the principle of

Question 44 of 97
44. Question
The vertical deflection of an electron beam on the screen of a CRO is measured to be 8 mm. Now, the potential difference between the Yplates is doubled, and simultaneously the preaccelerating anode voltage is reduced to half of its previous value. Then, the vertical deflection of the beam on the screen would become

Question 45 of 97
45. Question
Gross errors occur in measurements because of

Question 46 of 97
46. Question
An induction type energy meter is found to run fast. Correction for this error can be made by

Question 47 of 97
47. Question
Standardization of potentiometers is done so that

Question 48 of 97
48. Question
The meter which does not have any component in it to provide control torque is

Question 49 of 97
49. Question
In a singlephase transformer, the magnetizing current is

Question 50 of 97
50. Question
A 230 V/460 V singlephase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is

Question 51 of 97
51. Question
A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and frequency are doubled, the new core losses are

Question 52 of 97
52. Question
A 3phase transformer possible 3phase connection by a combination of star (Y or y) and delta (D or d) with 30º lead phase displacement corresponding to watch clockface hour is

Question 53 of 97
53. Question
Two transformers of voltage ratio 1 kV/500 V, with impedances z_{1} = j0.04 Ω and z_{2} = j0.06 Ω, respectively, connected in parallel share a total load of 200 kVA. The kVA carried by each transformer is

Question 54 of 97
54. Question
A two winding transformer is connected as an autotransformer with the same voltage ratio of 2:1. If primary and secondary winding resistances of autotransformer are 0.03 Ω and 0.02 Ω, respectively, the primary equivalent resistance of autotransformer is

Question 55 of 97
55. Question
In a duplex lap winding, if y_{b} and y_{f} are backpitch and frontpitch, respectively, then

Question 56 of 97
56. Question
In a 4pole wave winding connected dc motor, the crossmagnetizing AT/pole for a brush shift of θ radians

Question 57 of 97
57. Question
The magnetic neutral plane shifts in a dc machine

Question 58 of 97
58. Question
The terminal characteristics of a dc generator suitable for electric welders is

Question 59 of 97
59. Question
A 220 V separately excited motor with Ra = 0.5 Ω running at 500 rpm draws a current of 20 A. The value of additional resistance in armature circuit to reduce the speed to 300 rpm at constant flux is

Question 60 of 97
60. Question
The mechanical power developed by a 3phase induction motor if the total rotor I^{2}R losses are 200 W and the slip is 4 %

Question 61 of 97
61. Question
Slot harmonics are reduced in induction motors by using

Question 62 of 97
62. Question
The armature reaction in a synchronous generator supplying leading power factor load is

Question 63 of 97
63. Question
Torque angle for the synchronous machine is the angle between

Question 64 of 97
64. Question
The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45º and 15º, respectively. The direct axis and quadrature axis currents, respectively, are

Question 65 of 97
65. Question
The maximum reluctance power of a salientpole synchronous motor having directaxis reactance, 1.0 pu and quadratureaxis reactance, 0.5 pu, and input voltage, 1.0 pu is

Question 66 of 97
66. Question
In a singlephase induction motor when the rotor is stationary and voltage is applied to the stator, then

Question 67 of 97
67. Question
In a splitphase induction motor, the resistance/reactance ratios of windings are such that

Question 68 of 97
68. Question
Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequencypower characteristics have a common slope of 1 MW/Hz and the noload frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is

Question 69 of 97
69. Question
The speed of a 2pole, 3phase stepper motor operated by 1200 pulses/min

Question 70 of 97
70. Question
If the constants, A = D = 1 + YZ/2 of a transmission line by nominal π model, then the constants B and C, respectively are

Question 71 of 97
71. Question
In a per unit system of a transmission line

Question 72 of 97
72. Question
The insulation resistance per metre length of a single core cable of conductor radius, r, sheath inside radius, R and resistivity, ρ is

Question 73 of 97
73. Question
A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is

Question 74 of 97
74. Question
In a large power system for n x n matrix, the sparsity is defined as

Question 75 of 97
75. Question
If nonlinear loads are connected to the power system, then

Question 76 of 97
76. Question
The benefit of power factor correction in a power system is

Question 77 of 97
77. Question
The power flow problem mathematical model for a linear transmission network

Question 78 of 97
78. Question
The sequence components of current of a singlephase load connected to a 3phase system are

Question 79 of 97
79. Question
In a 3phase balanced neutral grounded starconnected load, phase b is open. If I_{a} =10∠0^{o} and I_{c} =10∠120^{o} then

Question 80 of 97
80. Question
The value of capacitor used for power factor improvement in a feeder with V volts at 50 Hz and capacitor current I_{c}, is

Question 81 of 97
81. Question
A doublelinetoground fault from phase b to phase c occurs through the fault impedance, Z_{F} to ground. The fault conditions are

Question 82 of 97
82. Question
A solid state relay

Question 83 of 97
83. Question
In the induction type directional over current relay, when a shortcircuit occurs in the circuit

Question 84 of 97
84. Question
In a differential protection scheme of a generator winding with a fault, the secondary currents of CTs are Is1 = 2.2 + j 0 A and Is2 = 1.8 + j 0 A. The % bias setting, K of the relay is

Question 85 of 97
85. Question
In voltage source converter based HVDC transmission system the active power is controlled by changing

Question 86 of 97
86. Question
A Unified Power Flow Controller (FACTS controller) is a voltage source converter based

Question 87 of 97
87. Question
An SCR without any external connections is considered as

Question 88 of 97
88. Question
The device which allows reverse power flow and withstands highest switch frequency is

Question 89 of 97
89. Question
In a 230 V, 50 Hz singlephase SCR bridge converter operating at a firing delay angle, α and with large RL load, the input source current is

Question 90 of 97
90. Question
In a dcdc stepdown converter, the minimum inductance required for continuous current operation, if D, f, and R are duty ratio, switching frequency and load resistance, respectively, then

Question 91 of 97
91. Question
If D is the duty ratio of a dcdc stepup converter, the relation between the input and out currents is

Question 92 of 97
92. Question
A 230 V, 50 Hz phase controlled singlephase fullcontrolled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is

Question 93 of 97
93. Question
The direction of rotation of an inverter fed 3phase ac motor is reversed by

Question 94 of 97
94. Question
The noload speed of a singlephase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, ф

Question 95 of 97
95. Question
The PWM pulses for the gate control circuit of an IGBT inverter fed 3phase induction motor drive are generated by using a triangular wave of frequency, f_{c} and

Question 96 of 97
96. Question
In electric traction for a trapezoidal speedtime curve, the time period is

Question 97 of 97
97. Question
Specific energy consumption of an electric train is the ratio between