RRB JE electrical practice paper | RRB JE Electrical

Ques.1. The single phase Induction Motor(Capacitor Start-Capacitor Run) basically is

1. Single phase motor
2. Two-phase motor
3. A.C series Motor
4. None of  these

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Ques.2. The equalizer rings are used in

1. Lap winding
2. Wave winding
3. Multilayer wave winding
4. None of these

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Ques.3. The horsepower obtained from the shaft torque is called

1. Indicated horsepower of I.H.P
2. Brake Horsepower of B.H.P
3. F.H.P
4. None of the above

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Ques.4. When the torque of the D.C motor is double the power is increased by

1. 70%
2. 50 to 60%
3. 20%
4. 100%

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Ques.5. The speed of sound in ideal gas varies directly at its

1. Pressure
2. Temperature
3. Density
4. Absoulte Temperature

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Ques.6. A pump driven by D.C Motor lifts 2,50,000 kgm of water per hour to a height of 50 metre. The efficiency of the pump is 80% and that of motor is 90%. If the supply voltage is 500 Volts, find the current drawn by the motor

1. 94.62 A
2. 26.45 A
3. 78.34 A
4. 89.90 A

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Ques.7. What is the mass of electron?

1. 1/1840 that of proton
2. 1/3650 that of proton
3. 1/1840 that of neutron
4. 1/3650 that of neutron

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Ques.8. What is the type of high voltage, high current discharge capacitor?

1. Rheostat
2. Trimmer
3. Paper capacitor
4. None of the above

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Ques.9. Two equally charged spheres placed in the air repel each other with a force equal to weight of 10⁻¹ kg. If there centres are 20 cm apart. Find the charge on each sphere

1. 4.39 × 10⁻⁶ C
2. 3.920  × 10⁻⁶ C
3. 2.89  × 10⁻⁶ C
4. 2.09 × 10⁻⁶ C

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Ques.10. The relative permeability of iron is of the order of

1. 10⁴
2. 10
3. 1
4. 10^-2

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