# EE SHORT NOTES-A.C. FUNDAMENTALS 4

 61 Form factor is the ratio of r.m.s. value/average value [other wrong options are – Average value/r.m.s. value, Average value/peak value, r.m.s. value/peak value, ]

 62 The peak value of a sine wave is 200 V. Its average value is 127.4V [other wrong options are – 141.4V, 282.8V, 200 V, ]
 63 The reflection co-efficient of the simplest standing wave is 1 [other wrong options are –  +1, Zero, Infinity, ]
 64 A parallel resonant circuit can be used Both (A) and (B) [other wrong options are – As a high impedance, To reject a small band of frequencies, To amplify certain frequencies, ]
 65 In an A.C. circuit I sin Φ is called Wattless component [other wrong options are – Active component, Any of the above, None of these, ]
 66 The negative maximum of a cosine wave occurs at 180 [other wrong options are – 30, 45, 90, ]
 67 In a parallel R-C circuit, the current always ____the applied voltage. Leads [other wrong options are – Lags, Remains in phase with, None of the above, ]
 68 Power factor of electric bulb is Unity [other wrong options are – Zero, Lagging, Leading, ]
 69 Power factor of the following circuit will be unity Resistance [other wrong options are – Inductance, Capacitance, Both (A) and (B), ]
 70 The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of____ degrees 45 [other wrong options are – 90, 60, 30, ]
 71 For a sine wave with peak value Imax the r.m.s. value is 0.707 Imax [other wrong options are – 0.5 Imax, 0.9 Imax, 1.414 Imax, ]
 72 A heater is rated as 230 V, 10 KW, AC. The value 230 V refers t r.m.s. voltage [other wrong options are – Average voltage, Peak voltage, None of these, ]
 73 The form factor of D.C. supply voltage is always Unity [other wrong options are – Zero, 0.5, Infinite, ]
 74 The dual of a link is Tree branch [other wrong options are – Twig, Node, Loop, ]
 75 The power factor of a series R-L-C circuit at its half-power points is Lagging or leading [other wrong options are – Unity, Lagging, Leading, ]
 76 What inductance will give the same reactance as a capacitor of 2 µF when both are at 50 Hz? 5 H [other wrong options are – 10 H, 15 H, 20 H, ]
 77 The frequency of domestic power supply in India is 50 Hz [other wrong options are – 200 Hz, 100 Hz, 60 Hz, ]
 78 In an A.C. circuit power is dissipated in Resistance only [other wrong options are – Inductance only, Capacitance only, None of the above, ]
 79 In a purely inductive circuit Actual power is zero [other wrong options are – Reactive power is zero, Apparent power is zero, None of these, ]
 80 Power factor of the following circuit will be zero Both (B) and (C) [other wrong options are – Resistance, Inductance, Capacitance, ]