# EE SHORT NOTES-A.C. FUNDAMENTALS 1

 1 Poor power factor results in all of the following EXCEPT. Reduction in power losses [other wrong options are – Overloading of transformers, Overloading of altemators, Reduction in load handling capacity of electrical system, ]
 2 The dual of a loop is Node pair [other wrong options are – Twig, Mesh, Tree, ]
 3 Higher the Q of a series circuit Narrower its pass band [other wrong options are – Broader its resonance curve, Greater its band width, Sharper its resonace, ]
 4 When an alternating current passes through an ohmic resistance the electrical power converted into heat is True power [other wrong options are – Apparent power, Reactive power, None of the above, ]
 5 For the full wave rectified sine wave the r.m.s. value is 0.707 Imax [other wrong options are – 0.636 Imax, 0.318 Imax, Zero, ]
 6 In A.C. circuit laminated iron is invariably used in order to Reduce eddy current loss [other wrong options are – Increase heat radiation, Make assembly cheap and easier, Reduce circuit permeability, ]
 7 In a circuit containing R, L and C, power loss can take place R only [other wrong options are – C only, L only, All of the above, ]
 8 All the rules and laws of D.C. circuit also supply to A.C. circuit containing Resistance only [other wrong options are – Capacitance only, Inductance only, All above, ]
 9 How much r.m.s. current does a 300 W. 200V bulb take from the 200 V, 50 Hz power line ? 1.5 A [other wrong options are – 0.5A, 2A, 3A, ]
 10 The r.m.s. value and mean value is the same in the case of Square wave [other wrong options are – Triangular wave, Sine wave, Half wave rectified sine wave, ]
 11 The period of a wave is Time required to complete one cycle [other wrong options are – The same as frequency, Expressed in amperes, None of the above, ]
 12 The capacitors for power factor correction are rated in terms of kVAR [other wrong options are – Voltage, VA, kW, ]
 13 Two sinusoidal quantities are said to be phase quadrature, when their phase difference is 90° [other wrong options are – 0, 30°, 45°, ]
 14 A coil with large distributed capacitance has a High resonant frequency [other wrong options are – Low resonant frequency, Low quality factor, Low resistance, ]
 15 A resonance curve for a series circuit is a plot of frequency versus Current [other wrong options are – Voltage, Impedance, Reactance, ]
 16 The unit of frequency of an A.C. signal is Hertz [other wrong options are – Cycle, Cycle-sec, Hertz/sec, ]
 17 The power taken by a 3-Φ load is given by the expression √3 VL IL cosΦ [other wrong options are – √3 VL IL sinΦ, 3 VL IL sinΦ, 3 VL IL cosΦ, ]
 18 In an A.C. circuit, a low value of kVAR compared with kW indicates High power factor [other wrong options are – Low efficiency, Unity power factor, Maximum Load current, ]
 19 In a pure resistive circuit Current is in phase with the voltage [other wrong options are – Current lags behind the voltage by 90°, Current leads the voltage by 90°, Current can lead or lag the voltage by 90°,
 20 Inductance affects the direct current flow At the time of turning on and off [other wrong options are – Only at the time of turning off, Only at the time of turning on, At all the time of operation, ]