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

Answer.2. Two-phase Motor

Ques.2. The equalizer rings are used in

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

Answer.1. Lap winding

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

Answer.2. Brake horsepower of B.H.P

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%

Answer.2. 50 to 60%

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

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

Answer.4. Absoulte temperature

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

Answer.1. 94.62 A

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

Answer.1. 1/1840 that of proton

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

Answer.3. Paper capacitor

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

Answer. 2.09 × 10−6C

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

1. 104
2. 10
3. 1
4. 10-2

Answer.1. 104

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