2. Given the milliammeter readings appearing in Fig. 7.9, determine the resistances R₁ and R₂. Assume Rinternal = 02 for all meters. FIG. 7.9 8.8 mA Ⓒ R₁ www R₂ 4.8 mA www 4 mA R Network with input resistance R = 2 kΩ
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- 8. Liquids with solid impurities a) Have higher dielectric strength b) Of large size have higher dielectric strength c) Have lower dielectric strength as compared to pure liquids d) None of the above 9. Peak to peak ripple is defined as a) the difference between average de voltage and peak value b) the difference between maximum and minimum de voltage c) the difference between maximum ac and average de voltages d) the difference between ac (rms) and average de voltages 10. In a Cockroft-Walton circuit, input voltage 100 kV load current 25 mA, supply frequency 100 Hz, each capacitor 10 nF. The optimum no. of stages for maximum output voltage is a) 1 b) 2 c) 10 d) 3529. A telephone circuit has a capacitance of 6 microfarads. What current flows through it when 15 V at 400 Hz is impressed across it? a. 0.2262 mA b. 226.1945 mA c. 226.1945 HA d. 994.7184 mAWhat is the period in milliseconds for a given voltage having an equation of v(t) = 100sin377t?
- Problem 5 Find the equivalent inductance Leg for the network shown below. 72 mH oooo Leg 49 mH elle elle 313 mH elle 64 mH elle 80 mHA 70-Vac source has the following waveform. Determine:a. equation of the waveform (in time domain)b. the instantaneous voltage when t = 120 msc. the angle (1st occurrence) after t = 0 when the voltage is +80 Vd. the time (2nd occurrence) after t = 0 when the voltage is –10 V(c) Using voltage division find the ratio | Vout/ Vin| Sshown in figure 7. Assume that the input voltage is a sinusoidal Vin(t) = Vin sin(wt) (volts). Write your solution as a phasor. R Vin (t) C Vout (t)
- 6) When the frequency of an a.c. circuit containing resistance and capacitance is decreased, the current (a) decreases (b) increases (c) stays the same 7) In a series a.c. circuit the voltage across a pure inductance is 12 V and the voltage across a pure resistance is 5 V. The supply voltage is (a) 13 V (b) 17 V (c) 7 V (d) 2.4 V 8) The impedance of a coil, which has a resistance of X ohms and an inductance of Y henrys, connected across a supply of frequency K Hz, is (a) 2π Κ Υ (b) X + Y (c) √x² + y² (d) √X² + (2nKY)² 9) When a capacitor is connected to an a.c. supply the current (a) leads the voltage by 180° (c) leads the voltage by 1/2 rad (b) is in phase with the voltage (d) lags the voltage by 90° 10) In an R-L-C series a.c. circuit a current of 5 A flows when the supply voltage is 100 V. The phase angle between current and voltage is 60° lagging. Which of the following statements is false? (a) The circuit is effectively inductive (c) The equivalent circuit reactance is 25 2 (b)…6) When the frequency of an a.c. circuit containing resistance and capacitance is decreased, the current (a) decreases (b) increases (c) stays the same 7) In a series a.c. circuit the voltage across a pure inductance is 12 V and the voltage across a pure resistance is 5 V. The supply voltage is (a) 13 V (b) 17 V (c) 7 V (d) 2.4 V 8) The impedance of a coil, which has a resistance of X ohms and an inductance of Y henrys, connected across a supply of frequency K Hz, is (a) 2π Κ Υ (b) X + Y (c) √x² + y² (d) X² + (2nKY)²The voltage applied to the metal grid of CRO is negative with respect to cathode. Select one: O True O False The sinusoidal current waveform having the maximum value of 30 A then the R.M.S value is Three coils each having resistance of 29 n are connected in star across 436 V, 50 Hz supply. Then the total power consumed is O 19665.10 W O 3784.66 W O 755.20 W O 226.05 W
- 17 A Capacitor 10 stores 0124 Cat volts. Its Capacitance is ? AWhat is the unit of the product of inductance and capacitance? A. second B. square of second C. 1/second D. 1/second2A utility company plans to connect a total of 20uF of capacitance to a 7200 volt line. To make this connection four capacitors will be connected in series. What is the capacitance of each capacitor? Answer is 80uF. Now what is the minimum AC voltage rating of each capacitor?