InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
In a resistive ac circuit, the current __________ the voltage by __________ . |
| Answer» In a resistive circuit the current is in phase with voltage, i.e., lags by 0°. | |
| 52. |
When a lead acid cell discharges, the specific gravity of electrolyte increases. |
| Answer» During discharging specific gravity decreases. | |
| 53. |
For a high pass filter, β = in attenuation band. |
| Answer» β = - p. | |
| 54. |
A minimum function has |
| Answer» Poles and zeros on imaginary axis lead to reactance function. A minimum function cannot have poles and zeros on imaginary axis. | |
| 55. |
As per BIS, solid insulators are classified into 6 categories. |
| Answer» The number of categories is seven. | |
| 56. |
Dielectric constant of air is about 5. |
| Answer» ∈r for air is 1. | |
| 57. |
If V = - 10 V and V = - 15 V, VAB = 5 V. |
| Answer» VAB = VA - VB = 10 -(-15) = 5V. | |
| 58. |
In a conductor, voltage , conductance G and charges are related as |
| Answer» | |
| 59. |
If P = 250 W and p.f. = 0.707 lagging, Q = |
| Answer» Apparent power = , Q = 250 vars and lagging vars are taken as positive. | |
| 60. |
Figure shows an R-L circuit. The current is = 1 - . The rate of change of current at = 1 second is |
| Answer» | |
| 61. |
In the circuit of figure the switch is closed at = 0, At = 0 this current through inductance is |
| Answer» Current through an inductance cannot change instantaneously. | |
| 62. |
In the circuit of figure, the source supplies, 2.25 mA. The value of R must be |
| Answer» The current through 8 ohm and 2 ohm resistances is A or 1 mA. Therefore, current through (5 + R) ohm is 1.25 mA. | |
| 63. |
The sum of positive real functions |
| Answer» It is a property of positive real functions. | |
| 64. |
When tracing through a resistance we always get a voltage drop. |
| Answer» It depends on direction of current. | |
| 65. |
A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10 F capacitor in the second branch. At resonance frequency, the dynamic resistance is |
| Answer» Dynamic resistance = | |
| 66. |
If each branch of a Delta circuit has impedance Z then each branch of the equivalent Y circuit has impedance. |
| Answer» ZΔ = 3 Zy Zy = . | |
| 67. |
In the circuit of figure, Thevenin's resistance is 10 Ω |
| Answer» | |
| 68. |
An RLC series circuit has R = 1 Ω, L = 1 H, C = 1 F. The damping ratio is |
| Answer» . | |
| 69. |
The circuit shown in the figure, with R = 1/3 Ω, L = 1/4H, C = 3F has input voltage () = sin2. The resulting current () is |
| Answer» i(t) = iR(t) + iL(t) + iC(t) . | |
| 70. |
A copper coil has a resistance of 40 ohm at 20°C. At 100°C the resistance is likely to be |
| Answer» Temperature coefficient of copper = 0.00393 R100 = 40 (1 + 0.00393 x 80) 54 Ω | |
| 71. |
In the circuit of figure |
| Answer» Voltage across inductance leads the current and voltage across resistance is in phase with the current. | |
| 72. |
The current in an RL series circuit is 1 - amperes. Then / is |
| Answer» #NAME? | |
| 73. |
Given , and () is . The value of is |
| Answer» . | |
| 74. |
In a one port network . It is excited by a unit step current. The initial and final values of voltage across the network impedance are |
| Answer» | |
| 75. |
In figure, the current supplied by battery at = 0.5 is |
| Answer» Time constant of R-L branch = = 0.5 seconds. Current in 6Ω resistance is 1 A and current in R-L branch is 63.2% of final current of 1 A. | |
| 76. |
Two capacitors of 16 μF each are connected in series. Another capacitor of 16 μF is connected in parallel with this combination. The total capacitance will be |
| Answer» | |
| 77. |
The maximum current and voltage ratings for a 0.5 W, 10 kW resistor are |
| Answer» . | |
| 78. |
Figure shows a pole zero plot of I(). The likely current response in time domain is |
| Answer» Therefore , i(t) = -e-t + 2e-2t | |
| 79. |
In a purely capacitive circuit, the current __________ the voltage by __________ . |
| Answer» In inductive circuit current leads the voltage by 90°. | |
| 80. |
A circuit has two branches in parallel and each branch has only one element. The applied voltage and source current are = 200 sin (200 + 30°) and = 50 sin (200 + 50°). If one branch has capacitor, the other branch contains |
| Answer» The current is leading the voltage. Therefore, it is an RC circuit. | |
| 81. |
In the circuit shown in figure, I = 4A, V = 4, the voltage V is given by |
| Answer» Using superposition theorem, when Is = 0, v1 = 2 volt, when Vs = 0, current is 2A in 2Ω, so voltage 2 x 2 = 4 volt. Net 2 + 4 = 6 volt. | |
| 82. |
The average value of wave in figure is |
| Answer» | |
| 83. |
If B = 4 + 3, (B) = |
| Answer» 4 + j3 = 5∠36.87° | |
| 84. |
When a source is delivering maximum power to a load through a network, the ratio of power delivered to the source power |
| Answer» The network can be replaced by Thevenin's equivalent circuit. The load gets maximum power from the network but Thevenin's theorem does not guarantee that this will be half of maximum power. | |
| 85. |
The internal impedance of a source is 3 + 4 Ω. It is desired to supply maximum power to a resistive load. The load resistance should be |
| Answer» RL = 32 + 42. | |
| 86. |
In a series RLC circuit, the current at resonance is I the total energy stored in the circuit at resonance is |
| Answer» | |
| 87. |
In figure readings of the two voltmeters should be |
| Answer» Both voltmeter connected in parallel, hence read same voltage as applied. | |
| 88. |
The internal impedance of a source is 3 + 7 Ω. For maximum power transfer, load impedance should be |
| Answer» Load impedance should be conjugate of source impedance. | |
| 89. |
In the circuit of figure, the current through battery E is |
| Answer» 4 A current is flowing into the battery. Therefore, it is charging current. | |
| 90. |
If J, I and a denote current density, current and area of cross section of a conductor, then |
| Answer» Current density = current/area of cross-section. | |
| 91. |
If A = 3 + 1, A |
| Answer» A = 3 + j1 = 3.162∠18.43°, A4 = 100∠73.72°. | |
| 92. |
Two capacitors each of capacitance C and breakdown voltage V are joined in series. The capacitance and breakdown voltage of the combination is |
| Answer» Since the capacitors are in series, the total capacitance becomes 50%. Voltage across each is V. | |
| 93. |
In figure, a voltmeter of internal resistance 1200 Ω is connected across 600 Ω resistance and it reads 5 V. The value of R is |
| Answer» | |
| 94. |
For the two port network of figure, the voltage transfer ratio in domain is |
| Answer» | |
| 95. |
A system has transfer function The dc gain is |
| Answer» DC gain, i.e., gain at s = 0 equals | |
| 96. |
A circuit has two branches 1 and 2 in parallel. If |Q| = 8 KVAR and |Q| = 6 KVAR, the magnitude of total kvar drawn form supply will be |
| Answer» Both Q1 and Q2 may be positive or negative. | |
| 97. |
The driving point impedance Z is given by |
| Answer» SCNF is zero of an impedance function. OCNF is pole of an impedance function. . | |
| 98. |
When a function Z() having a pole at infinity is realized, we get |
| Answer» If we divide numerator by denominator we get term sL. s Therefore the network has inductance in series. | |
| 99. |
A specimen of a material has a resistivity of 1.78 x 10 ohm-m. The material is |
| Answer» Insulators have high resistivity. | |
| 100. |
A low pass single pole filter has a the corner frequency and its phase shift are |
| Answer» ωc = 0.04 x 106 ωc = 40 k rad/sec. | |