63102. Three inductors each 30 mH are connected in delta. The value of inductance or each arm of equivalent star is
63103. If the iron core of a coil is removed so that it becomes an air cored coil, its inductance
63104. In figure, E = 1 V (rms value). The average power is 250 mW. Then phase angle between E and I is
63105. Given Is = 20 A, Vs = 20 V, the current I in the 3 Ω resistance is given by
63106. A square current wave of magnitude 1 A is applied to an element for 5 seconds. The voltage across the element rises linearly from 0 to final value linearly. The element is
63107. A periodic voltage v(t) = 1 + 4 sin ωt + 2 cos ωt is applied across a 1 ohm resistance. The power dissipated is
63108. A constant k high pass p section has a characteristic impedance of 300 Ω at f = ∞ . At f = fc, the characteristic impedance will be
63109. If A = 4∠7°, A2 is
63110. Zinc oxide is a non-linear resistance.
63111. Raman effect is due to?
63112. Figure shows a dc circuit. The Thevenin's equivalent circuit at terminals a - b is
63113. The dependent current source shown in given figure.
63114. The current flowing through the resistance R in the circuit in the figure has the form 2 cos 4t, where R is
63115. Energy = voltage x charge.
63116. A coil is wound having a diameter d. Its inductance is 10 mH. If it is rewound on the same core with a wire having diameter 0.5 d and total weight of the wire is the same as before, the inductance will be
63117. The max design gradient for vertical profile of a road is:
63118. A resistance and an inductance are connected in parallel and fed from 50 Hz ac mains. Each branch takes a current of 5 A. The current supplied by source is
63119. Assertion (A): The inductance of an iron cored solenoid is not constant.Reason (R): BH curve of an iron specimen is non-linear.
63120. An RC driving point impedance function has zeros at s = - 2 and s = - 5. The admissible poles are
63121. A triangular Pulse of 10 V peak is applied to a capacitor of 0.4 F. The change of the capacitor and its waveform is
63122. A 10 μF capacitor is charged from a 5 volt source through a resistance of 10 kΩ. The charging current offer 35 m sec. If the initial voltage on C is - 3 V is
63123. If an admittance Y(s) has a term Ks, the realization would give
63124. If the diameter of a wire is doubled, the current carrying capacity of the wire becomes
63125. Assertion (A): The function is not positive real.Reason (R): The degrees of numerator and denominator differ by 2
63126. Two sinusoidal voltage sources v1 = 50 sin (100t) and v1 = 50 sin (100t + p ) are connected in parallel and fed an inductance XL = 2Ω. The cuirent through XL is
63127. In figure, the current after a long time after closing of switch is
63128. A system function , the system is at rest for t < 0. For i(t) = u(t), then v(t) is given by
63129. Two voltages 50 V each have a phase difference of 45°. The rms value of resultant sum of the two voltages is
63130. The energy stored in a coil is 108 J. It is opened suddenly in 10 ms. The power dissipated instantaneously across the blades of switch is
63131. A parallel RLC circuit with R1 = 20, is scaled giving R2 = 104, L2 = 10-4 and C2, the value of C2 is
63132. Thermistor has a positive temperature coefficient.
63133. In figure, power in 6 Ω resistor is zero then V =
63134. The Thevenin's equivalent of network in figure(1) is a 10 V source in series with 2 Ω resistance. If a 3 Ω resistance is connected across AB as shown in figure(2) the Thevenin's equivalent is
63135. A magnetic circuit has an iron length of 20 cm and air gap length 0.1 cm. If μr = 200 then
63136. A circuit is fed by two sources of the same frequency and values 100 ∠0° V and 20 ∠30°V. The current in a particular branch is 5 ∠19° A. If the magnitudes of the sources and changed to 200 ∠0° V and 40 ∠30° V, the current in that branch should be
63137. Two coils X and Y have self inductances of 5 mH and 10 mH and mutual inductance of 3 mH. If the current in coils X change at a steady rate of 100 A/s, the emf induced in coil Y is
63138. Two capacitors of 2 μF and 4 μF capacitance are connected in series across a 30 V dc battery. After the capacitors have been charged, the voltage across them will be
63139. A 50 Hz current has an amplitude of 10 A. The rate of change of current at t = 0.005 after i = 0 and is increasing is
63140. In the circuit shown in the figure, the current supplied by the sinusoidal current source I is
63141. The frame of an electric motor is earthed through three earthing plates resistances 30 Ω, 20 Ω and 10 Ω respectively. During fault the energy dissipated by three plates are W1, W2 and W3. Then
63142. If figure, power dissipated in 30Ω resistance will be maximum when value of R =
63143. In the following non-planar graph no.of independent loop equations are
63144. Two voltages are 50 ∠0 V and 75 ∠ - 60° V. The sum of these voltages is
63145. An RLC series circuit is fed form 100 V ac supply. Inductance is 1 H and Q = 7.5. At resonance, the voltage across inductance is
63146. The national flower of Bhutan?
63147. In the circuit shown in the figure, steady-state was reached when the switch S was open. The switch was closed at t = 0. The initial value of the current through the capacitor 2 C is
63148. As temperature increases, the temperature coefficient of a metal
63149. A wire has a resistance R ohm. If another wire of the same material and same weight has double the diameter (as compared to the first wire), the resistance of the second wire will be