SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

1190

1 hours

Created on August 07, 2023 By

Electrical Notebook

SSC JE Electrical / Mock Test Series : 1

Notification 2023 has been released on 26th July 2023. A total of 198 vacancies have been announced in various departments of the Central Government. The last date to apply online is 16th August. SSC JE 2023 Candidates with a degree/diploma in the relevant engineering stream are eligible for this post. The selection will be based on Computer Based Test (Paper I, Paper-II), Document Verification, and Medical Examination. Physical Standard Test/Physical Efficiency Test is conducted only for candidates applying in BRO.
The finally appointed candidates will get a salary range between Rs. 35,400/- to Rs. 1,12,400/-.

1 / 100

Category: Transformer

1. Transformer core are laminated in order to reduce –

A) Hysteresis loss

B) Eddy current loss

C) Core loss

D) Friction & windage loss

2 / 100

Category: Basic Electricity

2. The units for inductance is _________ and capacitance is ___________

A) Faraday, Henry

B) Henry, Faraday

C) Henry, Coulomb

D) Coulomb, Faraday

3 / 100

Category: Basic Electricity

3. The capacitor doesn’t allow sudden changes in

A) Voltage

B) Resistance

C) Current

D) Capacitance

4 / 100

Category: Basic Electricity

4. The expression for energy of an inductor

A) ½ LI^2

B) L/2I

C) ½ LI

D) ½ L^2.I

5 / 100

Category: Basic Electricity

5. The currents in the three branches of a parallel circuit are 3 A, 4 A and 5 A. What is the current leaving it?

A) The largest one among the three values

B) 0 A

C) Insufficient data provide

D) 12 A

6 / 100

Category: AC Fundamental

6. Unit of impedance is

A) Farad

B) Henry

C) Mho

D) Ohm

7 / 100

Category: Basic Electricity

7. Which, among the following is a unit for resistivity?

A) ohm/meter^2

B) ohm-meter

C) ohm-meter^2

D) ohm/meter

8 / 100

Category: Basic Electricity

8. What is the value of x if the current in the circuit is 5 A?

A) 25 ohm

B) 75 ohm

C) 55 ohm

D) 15 ohm

9 / 100

Category: Basic Electricity

9. The insulating medium between the two plates of capacitor is known as __________

A) Dielectric

B) Electrode

C) Capacitive medium

D) Conducting medium

10 / 100

Category: Magnetic Circuit

10. Paramagnetic materials are –

A) strongly repelled by a magnet

B) slightly attracted by a magnet

C) none

D) Strongly attracted by a magnet

11 / 100

Category: AC Fundamental

11. The form factor for a sinusoidal a.c. voltage is –

A) 1.41

B) 1

C) 0.707

D) 1.11

12 / 100

Category: DC Machines

12. The direction of rotation of a dc motor is found out by

A) Pulm rule

B) Flemmings Right hand rule

C) Left hand thumb rule

D) Flemmings Left hand rule

13 / 100

Category: AC Fundamental

13. Real part and imaginary part of admittance are respectively –

A) Reluctance and Permeance

B) Permeance and Susceptance

C) Resistance and Reactance

D) Conductance, Susceptance

14 / 100

Category: Magnetic Circuit

14. Which is the property of a coil by which a counter E.M.F is induced when the current through the coil changes?

A) Self-inductance

B) Capacitance

C) None

D) Mutual inductance

15 / 100

Category: Magnetic Circuit

15. Magnetic field is proportional to the –

A) all of these

B) Speed of electric charges

C) direction of electric charges

D) Quality of electric charges

16 / 100

Category: AC Fundamental

16. RMS value can be defined based on which of the following? –

A) Voltage

B) Heating effect

C) Charge transfer

D) Current

17 / 100

Category: Magnetic Circuit

17. When a permanent magnet is cut half what will be the result?

A) Two single pole magnets, one with a north pole and one with a south pole

B) Two single pole magnets, each of the magnets only having north poles

C) The piece of metal will lose it magnetism

D) Two dipole magnets, each with a north and South Pole

18 / 100

Category: AC Fundamental

18. The frequency of an AC voltage in India, is–

A) 314 Hz

B) 75 Hz

C) 100 Hz

D) 50 Hz

19 / 100

Category: AC Fundamental

19. Reactive power is the product of

A) V, I, cos ø

B) V, I, tan ø

C) V, I, sin ø

D) V, I

20 / 100

Category: Magnetic Circuit

20. S.I unit of Reluctance-

A) AT

B) N/Wb

C) AT/Wb

D) AT/m

21 / 100

Category: AC Machines & Transformer

21. With the star delta starter the voltage across the motor winding at starting is –

A) 57.7%

B) 75%

C) 100%

D) 66.7%

22 / 100

Category: Basic Electricity

22. S.I unit of conductance is –

A) Mho-m

B) Ohm

C) Ohm-m

D) Mho

23 / 100

Category: Basic Electricity

23. Voltage across the 60 ohm resistor is______

A) 48 V

B) 0 V

C) 120 V

D) 72 V

24 / 100

Category: Basic Electricity

24. Materials which easily allow the passage of electric current are known as ______

A) Conductors

B) Dielectrics

C) Semi-conductors

D) Insulators

25 / 100

Category: Magnetic Circuit

25. Magnetic lines of forces –

A) Are not predictable

B) Often intersect

C) Never intersect

D) Intersect only in some special circumstances.

26 / 100

Category: Magnetic Circuit

26. Magnetic lines of forces –

A) never intersect

B) intersect only in some special circumstances

C) are not predictable

D) often intersect

27 / 100

Category: Basic Electricity

27. Periodic is characterized by a repetition at fixed time intervals

A) False

B) True

28 / 100

Category: Basic Electricity

28. The energy per unit charge is

A) Voltage

B) Work

C) Current

D) Power

29 / 100

Category: Basic Electricity

29. The average half-cycle value of a sine wave with a 40 V peak is

A) 50.96 V

B) 25.48 V

C) 14.14 V

D) 6.37 V

30 / 100

Category: Circuit Theory & Network

30. The component of current which is in quadrature with supply voltage, is –

A) Watt-less component of current

B) True component of current

C) none

D) Active component of current

31 / 100

Category: Magnetic Circuit

31. What is the power in the magnetic field if the current in a coil has a constant inductance of L henrys grows at a uniform rate?

A) L / 2I^2 t

B) L / 2It

C) LI / 2t

D) LI^2/ 2t

32 / 100

Category: Magnetic Circuit

32. The reciprocal of permeability is –

A) MMF

B) Conductivity

C) Resistivity

D) reluctivity

33 / 100

Category: Basic Electricity

33. The flow of electron in solids is due to –

A) electrons & ions

B) Atoms

C) positive charges

D) electrons

34 / 100

Category: AC Fundamental

34. The energy stored by a capacitor is given by –

A) 1/2 CV^2

B) All of the above

C) 1/2 QV

D) Q^2 / 2C

35 / 100

Category: Basic Electricity

35. To obtain a high value of capacitance, the permittivity of dielectric medium should be –

A) unity

B) Low

C) zero

D) high

36 / 100

Category: Basic Electricity

36. Three nos 6-ohm resistances are connected in delta. Value of resistances if connected in star –

A) 18 ohm

B) 6 ohm

C) 2 ohm

D) 9 ohm

37 / 100

Category: Magnetic Circuit

37. Magnetic circuit is a closed path followed by –

A) M.M.F

B) flux

C) Flux density

D) None of these

38 / 100

Category: Magnetic Circuit

38. Strength of the electromagnet can be increased by increasing –

A) either b or c

B) Reluctance

C) Magnitude of current

D) number of turns in the circuit

39 / 100

Category: DC Machines

39. Principle of dynamically induced E.M.F is used in a –

A) Generator

B) Thermo-couple

C) Choke

D) Transformer

40 / 100

Category: Magnetic Circuit

40. Statically induced E.M.F’s magnitude depends on the –

A) Coil resistance

B) None

C) Flux magnitude

D) Rate of change of flux

41 / 100

Category: Magnetic Circuit

41. Which rule do we use to predict the direction of movement of a current carrying wire in a magnetic field?

A) Fleming's Right Hand Rule

B) Faraday's Right Hand Rule

C) Fleming's Left Hand Rule

D) Faraday's Left Hand Rule

42 / 100

Category: Basic Electricity

42. Resistance of any circuit depends on –

A) Inversely proportionate with length and cross sectional area

B) Directly proportionate with length and cross sectional area

C) Directly proportionate with length and inversely proportionate with cross sectional area

D) Inversely proportionate with length and directly proportionate with cross sectional area

43 / 100

Category: Magnetic Circuit

43. Unit of magnetic flux density is in S.I.

A) Both A & B

B) Tesla

C) Oersted

D) WB/m²

44 / 100

Category: AC Fundamental

44. The RMS value of a sine wave is 100 A. Its peak value is –

A) 282.8 A

B) 150 A

C) 141 A

D) 70.7 A

45 / 100

Category: AC Machines & Transformer

45. Transformer is a

A) Static device

B) DC Machine

C) Both A & C

D) AC Machine

46 / 100

Category: Basic Electricity

46. When an alternating current passes through an Ohmic resistance the electrical power converted into heat is –

A) True power

B) Reactive power

C) Apparent power

D) none of the above

47 / 100

Category: Basic Electricity

47. The Inductor doesn’t allow sudden changes in

A) Resistance

B) Voltage

C) Current

D) Inductance

48 / 100

Category: DC Machines

48. The direction of rotation of a dc generator is found out by

A) Flemmings Left hand rule

B) Flemmings Right hand rule

C) Left hand thumb rule

D) Palm rule

49 / 100

Category: Basic Electricity

49. S.I unit of Power is –

A) Coulomb

B) Watt-hr

C) Joule

D) Watt

50 / 100

Category: Basic Electricity

50. Three lamps are connected in parallel across the voltage source. What happen if one lamp will burn out? –

A) Total current in the circuit will increase

B) no bulb will glow

C) The other two lamps will glow

D) all the three will glow

51 / 100

Category: AC Fundamental

51. The power factor of practical inductor is

A) Lagging

B) Unity

C) Zero

D) Leading

52 / 100

Category: Basic Electricity

52. What happens to the current in the series circuit if the resistance is doubled?

A) It becomes infinity

B) It becomes zero

C) It becomes half its original value

D) It becomes double its original value

53 / 100

Category: Basic Electricity

53. The instantaneous value is the voltage or current value of a waveform at its peak

A) False

B) True

54 / 100

Category: Basic Electricity

54. What is the voltage measured across a series short?
a) b) c) d)

A) Null

B) Zero

C) Infinite

D) The value of the source voltage

55 / 100

Category: Magnetic Circuit

55. The induced E.M.F. and current always oppose the cause of producing them is according to which law?

A) Faraday

B) Lenz

C) Newton

D) Coulomb

56 / 100

Category: AC Fundamental

56. The square waveform of current has following relation between R.M.S. value and average value –

A) R.M.S. value of current is less than average value

B) None

C) R.M.S. value is equal to average value

D) R.M.S. value of current is greater than average value

57 / 100

Category: Basic Electricity

57. The current in each branch of a parallel circuit is proportional to _________

A) Equal in all branches

B) Proportional to the value of the resistors

C) The amount of time the circuit

D) Proportional to the power in the circuit

58 / 100

Category: AC Fundamental

58. The alternative name/names for active power is/are –

A) Average power

B) all of the above

C) Real power

D) True power

59 / 100

Category: Basic Electricity

59. Unit of resistivity is

A) Ohm

B) Ohm/m

C) Ohm-m²

D) Ohm-m

60 / 100

Category: Basic Electricity

60. Three lamps are connected in parallel across the voltage source. What happen if one lamp will burn out? –

A) Total current in the circuit will increase

B) all the three will glow

C) The other two lamps will glow

D) no bulb will glow

61 / 100

Category: AC Fundamental

61. The frequency of an AC voltage,e= 100 cos 314t , will be –

A) 25 Hz

B) 60 Hz

C) 50 Hz

D) None

62 / 100

Category: AC Fundamental

62. The power factor of an AC circuit lies between –

A) -1 and 1

B) 0 and 1

C) 0 and -1

D) None of these

63 / 100

Category: Basic Electricity

63. Which is the most cost efficient connection?

A) Neither series nor parallel

B) Series

C) Either series or parallel

D) Parallel

64 / 100

Category: Magnetic Circuit

64. Magnetic field strength is

A) N.i / L

B) N.i

C) None of these

D) N.ø/I

65 / 100

Category: DC Machines

65. Which of the following is used to determine the direction of rotation of D.C motor?

A) Fleming’s Right-hand Rule

B) Thumb Rule

C) Lenz’s Law

D) Fleming’s Left-hand Rule

66 / 100

Category: Circuit Theory & Network

66. What will be the Q-factor of a circuit, if power factor is 0.9?

A) 0.111

B) 1.111

C) 1

D) 0.81

67 / 100

Category: Basic Electricity

67. The voltage across the short is?

A) 135 V

B) 11.25 V

C) Zero

D) Infinity

68 / 100

Category: Circuit Theory & Network

68. Which of the following will not be affected due to change in R?

A) Q

B) None

C) Resonant frequency

D) Bandwidth

69 / 100

Category: Basic Electricity

69. Many resistors connected in series will?

A) Increase the source voltage in proportion to the values of the resistors

B) Divide the current proportionally

C) Reduce the power to zero

D) Divide the voltage proportionally among all the resistor

70 / 100

Category: Magnetic Circuit

70. Which of the following is unit less?

A) Magnetic susceptibility

B) Moment of Magnet

C) Permeability

D) Permittivity

71 / 100

Category: AC Fundamental

71. RMS value can be defined based on which of the following? –

A) Charge transfers

B) Heating effect

C) Voltage

D) Current

72 / 100

Category: Magnetic Circuit

72. The principle of electromagnetic induction was propounded by

A) Faraday

B) Flemmings

C) Edison

D) Orsted

73 / 100

Category: AC Fundamental

73. The most important advantage of using electrical energy in the form of a AC is –

A) The construction cost per kilowatt of AC generator is lower than that of DC generator

B) Transformation of voltage is possible in case of AC only

C) Conductor of smaller x-section is required in case of AC in comparison to DC for carrying the same current

D) Less insulation is required in case of AC

74 / 100

Category: Basic Electricity

74. The resistance of straight conductor is independent of-

A) Material

B) Temperature

C) Shape of cross-section

D) Cross-sectional area

75 / 100

Category: AC Fundamental

75. The power factor of an ordinary electric bulb is

A) Zero

B) Slightly less than unity

C) Unity

D) Slightly more than unity

76 / 100

Category: AC Fundamental

76. Two waves of the same frequency have opposite phase when the phase angle between them is –

A) 0°

B) 360°

C) 90°

D) 180°

77 / 100

Category: Basic Electricity

77. The reciprocal of resistivity is________

A) Conductivity

B) Impedance

C) Conductance

D) Resistance

78 / 100

Category: Basic Electricity

78. What is the relation between resistance R and resistivity ρ of a wire ?

A) R= a/( ρ.l)

B) R=ρ. (l/a)

C) R= l/( ρ.a)

D) R= ρ. (a/l)

79 / 100

Category: AC Fundamental

79. The peak value of a sine wave is 200 V. Its average value is –

A) 141.4 V

B) 282.8 V

C) 127.4 V

D) 200 V

80 / 100

Category: Basic Electricity

80. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

A) None of the above

B) 45°

C) 40°

D) 0°

81 / 100

Category: AC Fundamental

81. The frequency of an alternating current is –

A) The number of cycles generated in one minute

B) The number of waves passing through a point in one second

C) The speed with which the alternator runs

D) the number of electrons passing through a point in one second

82 / 100

Category: Basic Electricity

82. The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.

A) True

B) False

83 / 100

Category: Basic Electricity

83. The unit of frequency is the hertz

A) False

B) True

84 / 100

Category: Basic Electricity

84. What is the RMS value of the current if the maximum value of sine wave current is 100 A?

A) 7.07 A

B) 707.2 A

C) 70.72 A

D) 100 A

85 / 100

Category: Basic Electricity

85. When a sine wave has a frequency of 100 Hz in 12 s it goes through

A) 12 cycles

B) 1,200 cycles

C) 120 cycles

D) 1/100 cycle

86 / 100

Category: Basic Electricity

86. The voltage across the open circuit is?

A) 90 V

B) 100 V

C) 0 V

D) Infinity

87 / 100

Category: Basic Electricity

87. What is the relation between resistance R and resistivity ρ of a wire ?

A) R= l/( ρ.a)

B) R= a/( ρ.l)

C) R=ρ. (l/a)

D) R= ρ. (a/l)

88 / 100

Category: Magnetic Circuit

88. The unit of magnetic flux is –

A) Weber

B) Ampere turns

C) Tesla

D) Henry

89 / 100

Category: Magnetic Circuit

89. Magnetic field has -

A) none

B) Only direction

C) only magnitude

D) both magnitude & direction

90 / 100

Category: DC Machines

90. Which DC motor is preferred for wide range of speed regulation?

A) Differential motor

B) Shunt motor

C) Compound motor

D) Series motor

91 / 100

Category: Basic Electricity

91. What is the resistivity of Copper?

A) 5.35×10^-8 ohm-m

B) 2.7×10^-8 ohm-m

C) 1.59×10^-8 ohm-m

D) 7.3×10^-8 ohm-m

92 / 100

Category: Basic Electricity

92. Which of the following statements are true with regard to resistivity?

A) Resistivity depend on the length

B) Resistivity depend on area of cross section

C) Resistance depends on the temperature

D) Resistance does not depend on the temperature

93 / 100

Category: Basic Electricity

93. Which of the following statements are true with regard to resistance?

A) Resistance is inversely proportional to the resistivity of the wire

B) Resistance is inversely proportional to the length of the wire

C) Resistance is directly proportional to a length of the wire

D) Resistance is directly proportional to an area of cross section of the wire

94 / 100

Category: AC Fundamental

94. The equation for instantaneous value of alternating current is, then time period will be –

A) 0.01 sec

B) 0.06 sec

C) 0.04 sec

D) 0.05 sec

95 / 100

Category: AC Fundamental

95. RMS value can be defined based on which of the following? –

A) Heating effect

B) Voltage

C) Current

D) Charge transfers

96 / 100

Category: Basic Electricity

96. The formula used to find the capacitance C is __________

A) Qv

B) Q-v

C) Q/v

D) Q + v

97 / 100

Category: AC Fundamental

97. Sparking may occurs when a load is switched off due to the presence of –

A) High Inductance

B) High capacitance

C) Low impedance

D) High impedance

98 / 100

Category: Basic Electricity

98. The total resistance between A and B are?

A) 20 ohm

B) 80 ohm

C) 0 ohm

D) 5 ohm

99 / 100

Category: Basic Electricity

99. Three lamps are connected in parallel across the voltage source. What happen if one lamp will burn out?

A) Total current in the circuit will increase

B) All the three will glow

C) The other two lamps will glow

D) No bulb will glow

100 / 100

Category: AC Fundamental

100. The length of a phasor represents the amplitude

A) False

B) True

Your score is

The average score is 29%

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