RRB JE Stage II exam is scheduled to be conducted from 28th August to 1st September2019. The overall merit for the selection will be made on the basis of the marks scored in stage II, so candidates need to prepare thoroughly for the second stage. To help the aspirants, Adda247 has come up with a study plan in which we will provide you daily quizzes of all technical subjects. The below quiz will be helpful for the candidates who opted Electrical as the exam group in RRB JE stage II.
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Q1. The materials having low retentivity are suitable for making
(a) week magnets
(b) temporary magnets
(c) permanent magnets
(d) none of the above
The materials which do not maintain their magnetic properties for a long time are known as temporary magnetic materials and this property is known as low retentivity.
For maximum power transfer for A.C.
Q3. A magnet does not attract
Copper is a diamagnetic material and hence, it is not attracted by magnets.
Q5. Fleming’s left-hand rule is used to find
(a) direction of magnetic field due to current carrying conductor
(b) direction of flux in a solenoid
(c) direction of force on a current carrying conductor in a magnetic field
(d) polarity of a magnetic pole
Using Fleming’s left hand rule we can find the direction of force on the conductor carrying a current in a magnetic field.
In this rule, thumb represents the direction of force on conductor, forefinger represents direction of field and middle finger represents the direction of current.
Q6. In a single -phase induction regulator, the voltage boost is maximum when armature mmf and rotor mmf make an angle of
a) zero degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees
To obtain a maximum of the voltage in induction regulator, the stator mmf and rotor mmf should be stationary and aligned to each other.
Q7. Substances which have permeability less than the permeability of free space are known as
If permeability of a material is slightly less than 1 then it is called diamagnetic material.
Q9. Which of the following is a ferromagnetic material?
Nickel is a ferromagnetic material.
Q10. Area of hysteresis loop represents
(a) copper loss
(b) eddy current loss
(c) dielectric loss
(d) Energy loss to magnetize and demagnetize the core
Energy loss to magnetize and demagnetize the core
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