RRB JE Stage II : Electrical Engineering Quiz | 23rd 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. 

Q1. Air blast circuit breaker is used for
(a) over currents
(b) short duty
(c) intermittent duty
(d) repeated duty

S1.Ans(d)
Sol.
Air blast circuit breaker is used for repeated duty.

Q2. The insulating material for cables should
(a) be acid proof
(b) be non-inflammable
(c) be non-hygroscopic
(d) have all above properties

Q3. The surge resistance of cable is
(a) 5 ohms
(b) 20 ohms
(c) 50 ohms
(d) 100 ohms

S3.Ans(c)
Sol.
The surge resistance of cable is 50 ohm.

Q4. If the length of a cable is doubled, its capacitance
(a) become one-fourth
(b) becomes one-half
(c) becomes double
(d) remains unchanged

S4.Ans(c)
Sol.
The length of the cable and the capacitance of the cable are directly proportional to each other. Hence, if the length gets doubled, then the capacitance also can be doubled.

Q5. If the lagging reactive power of an a.c. circuit increases, the power factor of the circuit ……….
(a) is increased
(b) is decreased
(c) remains unchanged
(d) none of the above

6. Impedance of an a.c. circuit is a …………
(a) phasor
(b) vector quantity
(c) scalar quantity
(d) none of the above

S6. Ans(b)
Sol.
Impedance of an a.c. circuit is a vector quantity. It is generally represented by Z.
Z = R + j X; R = Resistance of ac circuit, X = Reactance of ac circuit

Q7. The instrument in which springs provide the controlling torque as well as serve to lead current into and out of the operating coil is ……………. Instrument.
(a) moving-iron
(b) hot-wire
(c) permanent-magnet moving coil
(d) none of the above

S7. Ans(c)
Sol.
The instrument in which springs provide the controlling torque as well as serve to lead current into and out of the operating coil is PMMC Instrument.

Q8. The positive sequence impedance of a feeder is 3 Ω. Its negative sequence impedance will be
(a) 3Ω
(b) 1Ω
(c) 9Ω
(d) 6Ω

S8. Ans(a)
Sol.
The positive sequence impedance of a line is equal to the negative sequence impedance (3Ω).

Q9. Assuming diodes D1 and D2 in Figure to be ideal, the current through them will be

 

S9. Ans(b)
Sol.. the current through diode D2 is zero because it is reverse biased. However, diode D1 is forward biased and current through it is 5 V/10 kΩ = 0.5 mA

 

Q10. What will be the resultant weight on per meter of length of conductor if weight of conductor is 150 kg/m, weight of ice in per meter of length is 60 kg/m and wind force is 200 Kg/m.?
(a) 300 kg/m
(b) 468 kg/m
(c) 290 kg/m
(d) 390 Kg/m

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