Q1. Two practical coils with internal resistances of R,, R, has quality factors of Q, Q» respectively. If these two coils are connected in series then resultant quality factor is.... Ans. GR, +Q,R, R, + R, Activate Windows
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- 91)Give Short Ansaers:- a) Determine the dimensions of and Inductance. 2) Differentiiate classi Fication used c) Difine resoluticn one Capacitance between different for Absolute standards Electrical measurinents accuracys and elror example each,Q2) A 3-phase, half-wave thyristor converter is connected through a voltage source 150 V as input voltage and used to supply resistive load of 10 2. Determine rsm voltage, rms current, ripple factor and dissipated power in the resistor R. If a = 45° and f = 50 Hz. %3DC. A single phase full converter feeding RL load has the following data: source voltage 230V(RMS), SOHZ.R-2.52 L=very large, firing angle -30"f the load inductrance is large enough to make the load current constant then i Sketch the time variation of sounce voltage source current, load voltage, load current current through one thyristor and voltage across it H. Compute the average value of load voltage and load current, Derive the formula.
- Two coupled coils have self-inductances L1= 2 H and L2=0.5 H, and a coefficient of coupling K = . 0.9. Determine the turns ratio N1/N2 of the two coils. a. 2 b. 0.2 c. 0.5 d. 0.99. A noninductive load with a resistance of 30 Q2 is connected in series with a capacitor. The capacitor has a capacitive reactance of 25 Q and negligible resistance. The series circuit is energized from a 210 V, 60 Hz source. Determine: a. the impedance of the series circuit. b. the current, in amperes. c. the loss in volts across the noninductive resistance load. d. the loss in volts across the capacitor.Complete solution and add phase angles. Please put clear derivation of formulas. Thank you.
- A 100 kVA, 400 V/250 kV testing transformer has 8% leakage reactance and 2% resistance on 100 kVA base. A cable has to be tested at 500 kV using the above transformer as a resonant transformer at 50 Hz. If the charging current of the cable at 500 kV is 0.4 A, find the series inductance required. Assume 2% resistance for the inductor to be used and the connecting leads. Neglect dielectric loss of the cable. What will be the input voltage to the transformer?Please solve this 2 problems in detail Problem 1: Consider a step up converter with a resistive load of value R=10 Ohms. It is supplied by a DC power source of magnitude Vs=220 V. The switching frequency is 4 kHz and the duty cycle k is first set to 0.5 and the inductance used within the circuit has a value of L=20 mH. The switch is supposed to be ideal. Using the boundary conditions, the minimum and maximum load current values are equal to: Select one : a. 41.65A and 44.695A b. 43.32A and 44.695A c. None of these d. 43.32A and 47.85A Problem 2: A step up DC converter is used to control power flow from a DC votage Vs = 100V to a battery voltage E = 200V. The power transferred to the battery is 20 kw. The current ripple of the inductor is negligible. The duty cycle and the effective load resistance as seen from the input are respectively equal to: Select one: a. None of these b. 0.5, 0.5 Ohms c. 0.33, 0.5 Ohms d. 0.5, 0.33 OhmsGENERAL RLC CIRCUITS: Solve and show your solution completely. Make sure your answers are in 4 decimals places. The ohmic resistance of a large magnetic contactor is measured to be 20 ohms. A 230 V 60 Hzis impressed upon the contactor and the current is taken as 3.2 amperes. Neglecting core loss,determine the inductance of the contactor in mH.
- A series circuit consists of a resistor, a coil, and a capacitor connected across a 300 V, 60 Hz AC source. THe current drawn is 20A. The voltage across the resistor is 60 V, that across the coil is 260 V and that across the capacitor is 100V. The resultant voltage across the coil and the capacitor is 254.56 V. Determine (a) the resistance of the resistor, (b) the resistance and inductance of the coil, and (c) the resistance and capacitance of the capacitor.If it is connected in series with a pure resistance R with resistance R, inductance L, the current it draws with sinusoidal voltage application with an effective value of 100V is 5A. The voltage at the ends of the coil and resistance element is 80V and 30V.a-find only the power and power factor spent by the coil?b-find the power and power factor that the system consumes?c-draw the voltage triangle, impedance triangle and power triangle? Can you solve the all a, b and c options? PleaseA. A coil of 1000 turns is uniformly wound on a ring of non-magnetic material, the mean diameter being 20 cm. The cross-sectional area of the coil is 4 cm2. Determine the selfinductance of the coil. Ans. 0.8mH B.An iron core 0.4m long and 5 cm2. In cross section, is wound with 300 turns. When a current of 0.5 A flows in the coil, how much is the inductance of the coil. Assume the core has a permeability of 2500.