TSSPDCL JLM SPECIAL | Electric pressure is also called?

April 26, 2023 / 12:00 PM IST

JLM SPECIAL

1. A transformer having a constant
a.Voltage b.Current
c.Power d.Power factor
2. The rapid wears of brushes takes place due to
a.Abrasion from dust
b.Excessive spring pressure
c. Rough commutator bars
d. All of the above
3. Step down transformer having
a.N2>N1 b.N2<N1
c.N2=N1 d.none
4. Y-∆ starting of motor is not possible in ase of
a.1-phase motors
b.Variable speed motors
c.Low horse power motors
d.High speed motors
5. The term “cogging” is associated with
a.3-phase transformer
b.Compound generators
c.DC series motors
d.Induction motors
6. Synchronous motor runs at
a.Synchronous speed
b.< synchronous speed
c.> synchronous speed
d.None
7. An over excited synchronous motor takes
a.Leading current
b.Lagging current
c.Both a and b
d.None
8. Which is the absolute instrument
a.Ammeter b.Watt meter
c.Energy meter
d.Tangent galvanometer
9. For the induced draught the fan is located
a.Near bottom of chimney
b.Near bottom of furnace
c.At the top of chimney
d.Any where permissible
10. Which of the following are the parameters of transmission lines
a.Resistance b.Inductance
c.Capacitance
d.All of the above
11. 310 KM line is considered as
a. Long line b.Medium line
c. A short line
d. Any of the above
12. Which of the following mate rial is used for overhead transmission lines
a. ACSR b. AAC
c. SOLID CONDUCTOR
d. HOLLOW CONDUCTOR
13. Which of the following is not a constituent for making po rcelain insulator
a. Quartz b.Kaolin
c.Feldspar d.Silica
14. Electric pressure is also called
a. Resistance b. Power c.Voltage d.Energy
15. The FERRITES are materials
a.paramagnetic
b.ferromagnetic
c.diamagnetic
d.none of the above
16. Sound cannot travel through
a.Solids b.Liquids
c.Gases d.Vacuum
17. A dc shunt motors are used for driving
a.trains b.hoists
c.cranes d.machine tools
18. which of the magnetic mate rials are diamagnetic
a. silver b.copper
c.silver and copper d.iron
19. short circuit test on trans former is conducted to determine
a.iron losses
b.copper losses
c.hysteresis losses
d.eddy current losses
20. The earth potential is taken as
a. Infinite b.Supply voltage
c.1 volt d. Zero
21. Chisels are made of
a.High carbon steel
b.High speed steel
c.Cast steel
d.Tungsten steel
22. Units for inductance is
a.Faraday b.Coulomb
c.Henry d.Ohms
23. Units for capacitance
a.Faradays b.Ampere
c.Voltage d.Henry
24. Why does the earth conductor provide a path to go
a.For over current
b.For high voltage
c.For leakage current
d.For low voltage
25. The balanced condition potential of neutral is
a.Low b.High
c.Medium d.Zero
26. Five 2V cells are connected in parallel then o/p voltage is
a.1V b.1.5V
c.1.75V d.2V
27. Charging of sulphated battery produces___heat
a.No b.Very little
c.Less d.More
28. H2 evolved during charging produces explosive mixture when it is more than
a.2% b.4% c.6% d.8%
29. Which of the following mate rials have higher retentivity of magnetism
a.Alnico b.Manganese
c.Copper d.Bismuth
30. An LC oscillator cannot be used to produce __ frequencies
a.High b.Audio
c.Very low d.Very high
31. In case of DC machines, mechanical losses are primary function of
a.Current b.Voltage
c.Speed d.None
32. Iron losses in a DC machines are independent of variation in
a.Speed b.Load
c.Voltage d.Speed voltage
33. In DC generators current to the external circuit from armature is given through
a.Commutator
b.Solid connection
c.Slip rings d.None
34. A DC generator can be considered as
a.Rectifiers
b.Prime moves
c.Rotating amplifies
d.Power pump

Ans :- 1.C 2.D 3.B 4.A 5.D 6.A 7.A 8.D 9.A 10.D 11.A 12.A 13.D 14.C 15.B 16.D 17.D 18.C 19.B 20.D 21.A 22.C 23.A 24.C 25.D 26.D 27.D 28.D 29.A 30.C 31.C 32.B 33.A 34.C

35. One tesla is
a.1 wb/m2
b.1 wb/m voltage
c.1 m/wb voltage d.None
36. Which winding in a trans former has more number of turns
a.Low voltage wdg
b.High voltage wdg
c.Primary wdg
d.Secondary wdg
37. Efficiency of a power trans former is of the order of
a.100% b.98%
c.50% d.25%
38. Which wdg of transformer has less cross-sectional area
a.Primary wdg
b.Secondary wdg
c.Low voltage wdg
d.High voltage wdg
39. An induction motor with 950 rpm speed will have
a.8 poles b.6 poles
c.4 poles d.2 poles
40. An induction motor is identical to
a.DC compound motor
b.DC series motor
c.Synchronous motor
d.Asynchronous motor
41. Which of the following motors used in mixies
a.Repulsion motor
b.Reluctance motor
c.Hysteresis motor
d.Universal motor
42. Which of the following motors is inherently self starting
a.Split motor
b.Shaded pole motor
c.Reluctance motor
d.None
43. Watt hour meter is classified as a.Deflecting instrument
b.Indicating instrument
c.Recording instrument
d.Integrating instrument
44. There is a greater possibility of occurrence of corona during
a. Dry weather b.Winter
c.Summer heat
d.Humid weather
45. Which of the following relays used on long transmission line
a.Impedance relay
b.Mho’s relay
c.Reactance relay d.None
46. The property of a conductor due to which it passes current is called
a.Resistance b.Reluctance
c.Conductance d.Inductance
47. Conductance is reciprocal of
a.Resistance b.Inductance
c.Reluctance d.Capacitance
48. The resistance of a conductor varies inversely as
a.Length b.Area of cross
c.Temperature d.Resistivity
49. With rise in temperature the resistance of pure metals
a.Increases
a.Decrease
c.First increase and them decrease
d.Remains constant
50. With rise in temperature the re sistance of semiconductors
a.Decreases b.Increase
c.Increase and decrease
d.Constant
51. If the frequency of transformer is increases iron losses
a.incresses b.decresses
c.both d.none
52. Which color wire is recomme nded for earth connection as per ISI code
a.Red b.Green
c.Black d.Blue
53. The potential of earth is
a.Low b.Zero
c.Medium d.High
54. The capacity of a battery is expressed in terms of
a.Current rating
b.Voltage rating
c.Ampere-hour rating
d.None
55. Weston standard cell at 200C has voltage of ___ volts
a. 0.8 b. 0.9
c.1.0187 d.1.5
56. Extent of corrosion in the underground material work depends upon
a.Amount of moisture
b.Type of metals
c.Type of soil chemic
d.All of the above
57. A substance that has 10 W retentiveness can be used for manufacturing of
a.Electromagnets
b.Permanent magnets
c.Bar magnets
d.Paramagnets
58. The unit of reluctance is
a.Ampere / cm2
b.Weber/m2
c.Ampere turns/weber
d.Ampere/weber
59. The net reactance is a RLC circuit is
a.XL b.XC
c.0 d.XL-XC
60. The impedance of a series RLC circuit is
a.√(R2+XL2+xc2)
b.√(R2+XL2-xc2)
c.√(R2+(XL-Xc )2
d.√(R2+(XL+Xc )2