RRB Junior Engineer Exam Model Question Paper

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RRB JE Question paper
1. A resistance of 10 ohm is connected across a supply of 200V. If resistance R is now connected in parallel with a 10
ohm resistance, the current drawn from the supply gets doubled. The value of unknown resistance R is
(a) 5 ohm
(b) 20 ohm
(c) 10 ohm
(d) 15 ohm
Ans : c
2. Kirchhoff’s first law is also called as
(a) voltage law
(b) Current law
(c) Mesh Current law
(d) All the above
Ans : b
3. Find the total resistance when four 3 Ohm resistance are connected in series
(a) 3 ohm
(b) 12 ohm
(c) 14 ohm
(d) 8 ohm
Ans : b
4. The practical unit of power is
(a) Joule
(b) Ampere
(c) Watt
(d) Weber
Ans : c
5. Form factor of a sine wave is
(a) 1.414
(b) 1
(c) 0
(d) 1.11
Ans : d
6. The unit of resistance is
(a) Mho
(b) ohm-m
(c) Ohms
(d) Amps
Ans :c
7. Unit of impedance is
(a) Ampere
(b) Volt
(c) Ohm
(d) mho
Ans : c
8. The close path of the flux around any current carrying circuit is referred as
Circuit.
(a) Magnetic
(b) Electric
(c) Electromagnetic
(d) None of these
Ans : a
9. The current flowing in an electrical circuit is due to the existence of
(a) mmf
(b) emf
(c) Resistance
(d) Reluctance
Ans : b
10. The magnetic flux flow through a magnetic circuit is due to
(a) mmf
(b) emf
(c) Resistance
(d) Reluctance
Ans : a
11. The on-line UPS is also called as
a. Stand-by UPS
b. Line Interactive UPS
c. Off line UPS
d. Current line UPS
Ans. b
12. ________ is used to convert alternating current to direct current.
a. Transformer
b. Diode
c. Resistor
d. Transistor
Ans. b
13. The supply voltage varies sinusoid ally and has a frequency __________ Hz.
a. 60
b. 50
c. 20
d. 10
Ans. b
14. Expression for magneto-motive force is
(a) N/I
(b) 1/NI
(c) I/N
(d) IN
Ans : d
15. Unit of mmf is
(a) Ampere /Volt
(b) Ampere- turns
(c) Volt
(d) Volt/Ampere
Ans : b
16. Magnetic field strength is equal to
(a) mmf. L
(b) L/ mmf
(c) mmf/ L
(d) 1/mmf.L
Ans : c
17. Peak inverse voltage of bridge rectifier is as that of centre-tap circuit.
a. Same
b. Twice
c. Half
d. Four times
Ans. c
18. Peak Resistance of the diode is increased when
a. Forward biased
b. Reverse biased
c. Both forward and reverse biased
d. Either a or b
Ans. b
19. The number of lines of force passing through the secondary coil S when unit current changes in the primary coil P
are called
(a) Self inductance
(b) Mutual inductance
(c) Self induction
(d) Mutual induction
Ans : c
20. Unit of flux
(a) Amp- turns
(b) Weber
(c) Volts
(d) Amps
Ans : b

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Here I am giving you RRB Junior Engineer Exam Model Question Paper

Question1. In relation to the synchronous machines, which one of the following statements is false?
In salient pole machines, the direct-axis synchronous reactance is greater than the quadrature-axis synchronous reactance
The damper bars help the synchronous motor self start
Short circuit ratio is the ratio of the field current required to produce the rated voltage on open circuit to the rated armature current
The V-curve of a synchronous motor represents the variation in the armature current with field excitation, at a given output power.

Answer : (C)

Question2. A 800 kV transmission line is having per phase line inductance of 1.1 mH/km and per phase line capacitance of 11.68 nF/km. Ignoring the length of the line, its ideal power transfer capability in MW is?
1204 MW
1504 MW
2085 MW
2606 MW

Answer : (C)

Question3. High Voltage DC (HVDC) transmission is mainly used for
Bulk power transmission over very long distances
Inter-connecting two systems with the same nominal frequency
Eliminating reactive power requirement in the operation
Minimizing harmonics at the converter stations

Answer : (A)

Question4. Body effect in MOSFETs results in
Increase in the value of trans conductance
Change in the value of threshold voltage
Decrease in the value of trans conductance
Increase in the value of output resistance



Question5. A 2-port network has parameters of ABCD. If all the impedences in the network are Doubled, then
A and D are remain unchanged B is doubled and C is halved
A, B, C and D are all Doubled
A and D are doubled C and B remain unchanged
A and D remain unchanged C is doubled and B is halved.

Ans : (a

Lissajous pattern shown in a double-beam cathode-ray oscilloscope screen for two sinusoidal voltages of equal magnitude and of the same frequency but of phase shift of 300 electrical is
A circle
A straight line at 45 0 in the first and third quadrant
An ellipse in the first and third quadrant
An ellipse in the second and fourth quadrant

Ans : (c

To increase the range of a voltmeter
A low resistance in series is connected with the voltmeter
A low resistance in parallel is connected with the voltmeter
A high resistance in series is connected with the voltmeter
A high resistance in parallel is connected with the voltmeter

Ans : (c