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Alternating Current Assignment 1





Question 1 Why it is not possible to have electrolysis by A.C?

Question 2 What is the value of the inductive reactance XL in a DC circuit?

Question 3  Which of the these works on the principle of self-induction?
a) Transformer
b) Transistor
c) choke
d) None of these

Question 4  If the velocity of the object is zero,the acceleration would also be zero
a) True
b) False

Question 5 What is true of any AC circuit?
a) None of these
b) The power dissipation happens in resistance only in AC circuit
c) The algebraic sum of the rms voltage across the different element of the circuit is equal to the applied rms voltage
d) The algebraic sum of the instantaneous voltage  across the different element of the circuit  is equal to the applied instantaneous voltage

Question 6 Transformers are used
a) To step up or step down ac voltage
b) To convert a.c to d.c
c) To step up d.c voltage
d)  To convert d.c to a.c

Question 7 What is true of AC GENERATOR?
a) It works on the principle of electromagnetic induction
b) The mechanical energy of the rotation is converted into electrical energy
c) A pair  of slip rings are used  in the AC generator
d) All the above



Question 8 An alternating voltage V=200sin300t is applied across a series combination of R=10Ω and L=800mH.
a) The impedence of the circuit is 240.2Ω
b) Power factor is given by .05
c) The peak current in the circuit is .8326 A
d) None of these

Question 9  In an series LC circuit, the voltage across  the L and C are
a) 180 out of phase
b) 90 out of phase
c)  are in same phase
d) 45 out of phase

Question 10  Let A and B are the heat production of the electric heater in AC and DC of same voltage.
a) A=B
b) A> B
c) A <B
d) none of the above

Question 11  An inductor having a reactance of 25 and a resistance R gives off heat at the rate of 10W when it carries a current of 0.50A (rms). What is the impedance of the inductor?
 
Question 12  At the moment depicted in the LC circuit the current is non-zero and the capacitor plates are charged (as shown in the figure below). The energy in the circuit is stored
Alternating current questions with solutions
a) only in the electric field and is decreasing.
b) only in the electric field and is constant.
c) only in the magnetic field and is decreasing.
d) only in the magnetic field and is constant.
e) in both the electric and magnetic field and is constant.
f) in both the electric and magnetic field and is decreasing.







Class 12 Maths Class 12 Physics