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RRB JE Stage II : Electrical Engineering Quiz | 22nd August

Dear aspirants,

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. Reciprocal of permeability is
(a) reluctivity
(b) susceptibility
(c) permittivity
(d) conductance

S1. (a)
Sol.
Reluctivity is reciprocal of permeability.

Q2. A transformer provides a path of magnetic flux of
(a) high conductivity
(b) high reluctance
(c) low reluctance
(d) low conductivity

Q3. Which of the following is not a unit of flux?
(a) Maxwell
(b) Tesla
(c) Weber
(d) All of the above

S3. Ans(b)
Sol.
Tesla is the unit of magnetic flux density. (1 tesla = 1 wb/sq.m)

Q4. Transformer works on the principle of
(a) gauss law
(b) self-induction
(c) Faraday’s law of electromagnetic inductions
(d) self and mutual induction both

S4.Ans(c)
Sol.
Transformer works on the principle of Faraday’s law of electromagnetic inductions.

Q5. Which of the following statements is correct?
(a) The magnetic flux inside an exciting coil is lower than its outside surface
(b) The magnetic flux inside an exciting coil is zero
(c) The magnetic flux inside the exciting coil is greater than its outside surface
(d) The magnetic flux inside the exciting coil is same as on its outside surface

S5.Ans(d)
Sol.
Magnetic flux inside and outside surface of an exciting coil is same.

Q6. In an induction motor, the torque T is related to the supply voltage V as
(a) T α V
(b) T α V²
(c) T α√V
(d) T α 1/V

S5.Ans(d)
Sol.
Magnetic flux inside and outside surface of an exciting coil is same.

Q7. Permanent magnets are normally made of
(a) alnico alloys
(b) aluminum
(c) cast iron
(d) wrought iron

S7.Ans(a)
Sol.
Alnico alloys are used for making permanent magnets.

Q8. Two coupled coils with L_1=L_2 = 0.6 have a coupling coefficient of K = 0.8. The turns ratio (N¬_1)/N_2 is
(a) 4
(b) 2
(c) 1
(d) 0.5

Q9. Laminated cores, in electrical machines, are used to reduce
(a) copper loss
(b) eddy current loss
(c) hysteresis loss
(d) all of the above

S9.Ans(b)
Sol.
To reduce eddy current loss laminated cores are used.
Q10. If coper loss of transformer at 7/8th full load is 4900 W, then its full load copper loss would be
(a)5600 W
(b) 6400 W
(c) 373 W
(d) 429 W

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