Transformers Questions

-

Basic Questions on Transformers


1)The basic function of a transformer is to change the
(a)level of the voltage
(b)power level
(c)power factor
(d) frequency

2)The flux created by the current flowing through the primary winding induces emf in 
(a) primary winding only
(b) secondary winding only
(c)ttransformer core only
(d)both primary and secondary windings

3)The iron core in the transformer provides a_______ path to the main flux.
(a)low reluctance
(b)high reluctance
(c)low resistance
(d)high conductivity

4)For an Ideal transformer the windings should have 
(a) maximum resistance on primary side and least resistance on secondary side.
(b)least resistance on primary side and maximum resistance on secondary side.
(c)equal resistance on primary and secondary sides.
(d)no ohmic resistance on either side.


5)For an Ideal transformer shown in the below figure
(a) V1=nV2, I2=-nI1
(b) V2=nV1, I2=-nI1
(c) V1=nV2, I2=(1/n)I2
(d) V1=nV2, I2=-(1/n)I1

Comment your answers in comment section



Comments

Post a Comment

Popular posts from this blog

Basic Electrical - III

-
1. An electric current is the (A) flow of electrons. (B) opposition to electrons. (C) storage of charge. (D) ionization of atom. 2. Electric pressure is also called (A) resistance. (B) power. (C) voltage. (D) energy. 3. Which of the following is best conductor of electricity? (A) aluminum. (B) silver. (C) copper. (D) gold. 4. The dielectric material used in variable capacitor is generally (A) mica. (B) air. (C) ceramic. (D) electrolyte.  5. What does a capacitor store? (A) Current. (B) Charge. (C) Voltage. (D) Power.                                      Comment Your Answers                             👍Share it to your friends👍                
Read more

Line Resistance in Transmission Line

-
Image
Line Resistance in Transmission Line  :- 👉Every electric conductor oppose the flow of current in it ,this is known as resistance. 👉The power loss (I^2R) in the transmission line occurs due to this resistance. 👉The ohmic resistance R of a conductor of length ' l ' and uniform cross sectional area 'a',                                  R= ρl/a  Where, R=Total resistance in Transmission Line, ρ=Resistivity or specific resistance of conductor material , l=Length of the conductor, a= Area of cross section, 👉The Resistivity or specific resistance of the conductor is depends not only on the conductor material but also it's temperature. 👉For example ,if ρ₁ and ρ₂ are the values of resistivity at different temperatures t₁ and t₂ ,then ρ₂=ρ₁{1+α(t₂-t₁)} Where, a = Temparature coefficient of resistance of the material. 👉The value of the temparature coefficient of resistance i...
Read more

Difference between Node and Junction

-
Image
Difference between Node and Junction :-   1)NODE:-    A point at which two or more elements are joints together is called node.    2)JUNCTION:-      While a point   where three or more        branches  meet   together  is  called   a junction.                   In the below figure we can say that points  a,b,c,d,e  and  f  are  nodes     and point  c &  f  are  called   junction.  While point c & f itself a node. Nodes -> a,b,c,d,e,f Junctions ->c,f  By observing above node and junction we can say that,  every junction becomes a node but every node not becomes a junction. ● SHARE IT
Read more