Model Questions for SSC Junior Engineer EXAM - Electrical Engg set-3

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Model Questions for SSC Junior Engineer EXAM - Electrical Engg set-3

1. Copper losses occurs due to ohmic resistance in

(a) Both primary and secondary winding
(b) Primary winding
(c) Secondary winding
(d) None of these

2. Slip of an induction motor increases with

(a) decrease in current and torque
(b) decrease in current and increase in torque
(c) increase in current and decrease in torque
(d) increase in current and torque

3. In an induction motor, rotor speed is always

(a) Less than the stator speed
(b) Equal to the stator speed
(c) More than the stator speed
(d) None of these

4. The frequency of the induced emf in an induction motor is

(a) Lesser than the supply frequency
(b) Same as the supply frequency
(c) Greater than the supply frequency
(d) None of these

5. Slip ring induction motor has

(a) Medium starting torque
(b) High starting torque
(c) Low starting torque
(d) None of these

Study Kit for SSC Junior Engineer EXAM (Paper-1) 2017-2018

6. Copper losses is proportional to

(a) square of kVA
(b) cube of kVA
(c) kVA
(d) none of these

7. If the transformer is loaded then the secondary terminal voltage falls for and rises for

(a) Unity power factor, lagging power factor
(b) Leading power factor, lagging power factor
(c) Lagging power factor, leading power factor
(d) Lagging power factor, unity power factor

8. Efficiency of a transformer is maximum at

(a) Leading power factor
(b) Unity power factor
(c) Lagging power factor
(d) None of these

9. The frequency of rotor current in an induction motor is

(a) slip times the frequency of supply
(b) One by slip times the frequency of stator current
(c) One by slip times the frequency of supply
(d) slip times the frequency of stator current

10. The efficiency of the transformer will be maximum when

(a) Iron losses is equal to the twice of the copper losses
(b) Iron losses is equal to the copper losses
(c) Copper losses is equal to the twice of the iron losses
(d) All of these

Study Kit for SSC Junior Engineer EXAM (Paper-1) 2017-2018

Answer

1. (a) 2. (d) 3. (a) 4. (b) 5. (b) 6. (a) 7. (c) 8. (b) 9. (a) 10. (b)