The frequency of direct current is …………………
A) 0 Hz
B) 50 Hz
C) 60 Hz
D) 100 Hz
1 Answers
Talk Doctor Online in Bissoy App
A train, standing at the outer signal of a railway station blows a whistle of frequency 400 Hz in still air. (i) What is the frequency of the whistle
Given: vs = 10 m/s, v = 340 m/s, n0 = 400 Hz Apparent frequency (n), velocity of sound (vs) in each case Formulae: i. n = n0 \((\frac{v}{v-v_s})\) ii. n = n0 \(\frac{v}{v+v_s}\) Calculation: a. As the train approaches the...
2 Answers 1 views
A stationary source produces a note of frequency 350 Hz. An observer in a car moving towards the source measures the frequency
Given: n0 = 350 Hz, v = 340 m/s, nA = 370 Hz To find: Speed (vL), Frequency (nA) Formulae: i. When the car moves towards the stationary source then, nA = n0 \((\frac{v+v_s}{v})\) ii. When the car moves away from...
2 Answers 1 views
The frequency of alternating current (AC) supply in India is ……………..
Correct option is B) 50 Hz
2 Answers 1 views
…………….. current has some frequency
Correct option is A) A.C
2 Answers 1 views
The rms value of current is 110√2 A then its peak value of current is ………………
Correct option is A) 220 A
2 Answers 1 views
A metal wire of radius 0.4 mm carries a current of 2 A. Find the magnitude of current density if the current is assumed to be uniformly distributed
Given: r = 0.4 mm = 0.4 × 10-3 m, I = 2 A To find: Current density (J) Formula: J = \(\frac{I}{A}\) Calculation: From formula, J = \(\frac{2}{3.142\times(0.4)^2\times10^{-6}}\) = 3.978 × 106 A/m2
2 Answers 134 views
The drift velocity of free electrons in a conductor is vd, when the current is flowing in it. If both the radius and current are doubled
Correct option is: (C) \(\frac{v_d}{2}\)
2 Answers 2 views
The process of superimposing a low frequency signal on a high frequency wave is ……………
Correct option is: (C) modulation
2 Answers 1 views
A bus is moving towards a huge wall with a velocity of `5m//s^(-1)`. The driver sounds a horn of frequency `200 Hz`. The frequency of the beats heard
Correct Answer - 6 Hz
2 Answers 4 views
Statement-1 : A parallel resonance circuit is called a rejector circuit. statement-2 : At resonance frequency, current is completely cut off.
Correct Answer - A Both the statements are ture, and statement-2 is correct explanaiton of statement-1.
2 Answers 1 views