Alternating current-1 Alternating current-1 1 / 20 Inductive reactance for direct current is Zero Infinite WL WC 2 / 20 Which of the following is correct for step up transformer Vs<Vp Vs>Vp Vs=Vp Vs=2Vp 3 / 20 Dimension formula of R. C is given by M^0L^0T^-1 M^0L^0T^-2 MLT^0 M^0L^0T 4 / 20 Transformation ratio in transformer is Vs/Vp Vp/Vs Vp. Vs Is. Vp 5 / 20 Phase difference between L-R circuit is Sin^-1( wL/R) Cos^-1(wL/R) Tan-1(wL/R) Tan^-1(R/wL) 6 / 20 Power factor is equal to R. Z Z/R R/z W. L 7 / 20 The average power in alternating current circuit is Erms. I rms cos( fie) Erms. Irms Erms. Cos(fie) Erms. Irms. Sin(fie) 8 / 20 The impedence of LR circuit is R^2+w^2L^3 {R^2+w^2.L^2}^1/2 R+wL WL+WC 9 / 20 The phase difference between current and voltage in only capacitive alternating current circuit is 0 π Π/4 Π/2 10 / 20 In step up transformer, the value of current in secondary coil Compared to primary coil is Equal More Less 0 11 / 20 For the resonance condition in LCR circuit the phase difference between applied voltage and current is π Π/2 0 Π/4 12 / 20 Step up transformer gives High voltage and low current Low voltage and high current High voltage and high current Low voltage and low current 13 / 20 The working principle of dynamo is based on Heating effect of current Induced current Electro magnetic induction Induced magnetism 14 / 20 An alternating current equation is I= 0.6sin ( 100πt) then the frequency of alternating current will be 50π 50 100π 100 15 / 20 A transformer is a device used to Convert DC in to ac Convert ac in to dc Increase or decrease ac voltage Increase or decrease DC voltage 16 / 20 In ac circuit power is lost only in Resistance Inductance Capacitance All of above 17 / 20 The phase difference between current and emf is ( fie) then the value of power factor is Sin(fie) Cos^2(fie) Cos( fie) Tan (fie) 18 / 20 Mean value of alternating current in full cycle is 2i I/2 0 I 19 / 20 Unit of reactance is Ohm Tesla Farad Gauss 20 / 20 What value of alternating current is measured by hot wire ammeter High value Rms value Average value Instantaneous value Your score isThe average score is 50% 0% Restart quiz
