1 Crore+ students have signed up on EduRev. Have you? 
Which of the following has different dimension from the other three,
The correct answer is: LR
An alternating emf is applied across a parallel combination of a resistance R, capacitance C and an induction L. If I_{R}, I_{L}, I_{C} are the currents through R, L and C respectively, then the diagram which correctly represents the phase relationship among I_{R}, I_{L}, I_{C} and source emf ε is the given by
The correct answer is:
I_{L} lags behind I_{R} by a phase of π/2
I_{C} lags behind I_{R} by a phase of π/2
The average power dissipated is pure inductance is
The correct answer is:
A DC ammeter cannot measure alternating current value
The time required for a 50Hz alternating current to increase from zero to 70.7% of its peak value is
Answer : b
Solution : 1/(50×8)
= 1/400sec
= 2.5ms
The variation of the instantaneous current I and the instantaneous emf E in a circuit is as shown in figure. Which of the following statements is correct
The correct answer is: The voltage leads the current by π/2
The correct answer is: power factor
In a series LCR circuit containing an AC voltage source of frequency ω, current I and voltage V. Then for the given resistance, the correct statement is:
The correct answer is: Current is maximum at ω^{2} = 1/LC
In an electric circuit applied ac emf is ε = 20 sin 300t Volt and the current is i = 4 sin 300t Amp. The resistance of the circuit is.
Answer : d
Solution : Emf, e = 20sin300t
Current, i = 4sin300t
Reactance, R = emf/I
R = 20/4
=5ohm
Use Code STAYHOME200 and get INR 200 additional OFF

Use Coupon Code 








