SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

833

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: Basic Electricity

1. The capacitor doesn’t allow sudden changes in

A) Resistance

B) Current

C) Voltage

D) Capacitance

2 / 100

Category: Basic Electricity

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

A) Henry, Coulomb

B) Faraday, Henry

C) Henry, Faraday

D) Coulomb, Faraday

3 / 100

Category: Magnetic Circuit

3. The reciprocal of permeability is –

A) Conductivity

B) reluctivity

C) Resistivity

D) MMF

4 / 100

Category: Magnetic Circuit

4. The principle of electromagnetic induction was propounded by

A) Orsted

B) Faraday

C) Flemmings

D) Edison

5 / 100

Category: AC Fundamental

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

A) 141.4 V

B) 127.4 V

C) 282.8 V

D) 200 V

6 / 100

Category: Basic Electricity

6. The expression for energy of an inductor

A) L/2I

B) ½ LI^2

C) ½ L^2.I

D) ½ LI

7 / 100

Category: Magnetic Circuit

7. Magnetic lines of forces –

A) often intersect

B) never intersect

C) intersect only in some special circumstances

D) are not predictable

8 / 100

Category: Basic Electricity

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

A) ohm/meter

B) ohm-meter^2

C) ohm/meter^2

D) ohm-meter

9 / 100

Category: Magnetic Circuit

9. Magnetic field is proportional to the –

A) Quality of electric charges

B) all of these

C) Speed of electric charges

D) direction of electric charges

10 / 100

Category: DC Machines

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

A) Left hand thumb rule

B) Flemmings Left hand rule

C) Flemmings Right hand rule

D) Palm rule

11 / 100

Category: Magnetic Circuit

11. Magnetic lines of forces –

A) Intersect only in some special circumstances.

B) Never intersect

C) Are not predictable

D) Often intersect

12 / 100

Category: AC Fundamental

12. Unit of impedance is

A) Ohm

B) Farad

C) Mho

D) Henry

13 / 100

Category: AC Fundamental

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

A) 0 and -1

B) None of these

C) 0 and 1

D) -1 and 1

14 / 100

Category: Basic Electricity

14. What is the resistivity of Copper?

A) 1.59×10^-8 ohm-m

B) 5.35×10^-8 ohm-m

C) 2.7×10^-8 ohm-m

D) 7.3×10^-8 ohm-m

15 / 100

Category: AC Fundamental

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

A) Voltage

B) Heating effect

C) Charge transfer

D) Current

16 / 100

Category: Magnetic Circuit

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

A) Fleming's Left Hand Rule

B) Fleming's Right Hand Rule

C) Faraday's Left Hand Rule

D) Faraday's Right Hand Rule

17 / 100

Category: Basic Electricity

17. S.I unit of conductance is –

A) Mho-m

B) Ohm

C) Mho

D) Ohm-m

18 / 100

Category: Basic Electricity

18. The energy per unit charge is

A) Current

B) Work

C) Power

D) Voltage

19 / 100

Category: AC Fundamental

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

A) 60 Hz

B) 25 Hz

C) None

D) 50 Hz

20 / 100

Category: AC Fundamental

20. The power factor of an ordinary electric bulb is

A) Slightly more than unity

B) Slightly less than unity

C) Zero

D) Unity

21 / 100

Category: Basic Electricity

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

A) R=ρ. (l/a)

B) R= a/( ρ.l)

C) R= l/( ρ.a)

D) R= ρ. (a/l)

22 / 100

Category: Magnetic Circuit

22. 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 dipole magnets, each with a north and South Pole

C) The piece of metal will lose it magnetism

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

23 / 100

Category: Magnetic Circuit

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

A) None

B) Rate of change of flux

C) Coil resistance

D) Flux magnitude

24 / 100

Category: AC Fundamental

24. 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

25 / 100

Category: Basic Electricity

25. Many resistors connected in series will?

A) Divide the current proportionally

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

C) Divide the voltage proportionally among all the resistor

D) Reduce the power to zero

26 / 100

Category: Magnetic Circuit

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

A) Lenz

B) Faraday

C) Coulomb

D) Newton

27 / 100

Category: Basic Electricity

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

A) True power

B) Apparent power

C) Reactive power

D) none of the above

28 / 100

Category: Basic Electricity

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

A) Q + v

B) Q/v

C) Qv

D) Q-v

29 / 100

Category: Basic Electricity

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

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

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

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

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

30 / 100

Category: Basic Electricity

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

A) Resistance depends on the temperature

B) Resistance does not depend on the temperature

C) Resistivity depend on area of cross section

D) Resistivity depend on the length

31 / 100

Category: Magnetic Circuit

31. Which of the following is unit less?

A) Permittivity

B) Permeability

C) Magnetic susceptibility

D) Moment of Magnet

32 / 100

Category: Magnetic Circuit

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

A) Tesla

B) WB/m²

C) Oersted

D) Both A & B

33 / 100

Category: Transformer

33. Transformer core are laminated in order to reduce –

A) Eddy current loss

B) Friction & windage loss

C) Core loss

D) Hysteresis loss

34 / 100

Category: Basic Electricity

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

A) Electrode

B) Conducting medium

C) Dielectric

D) Capacitive medium

35 / 100

Category: AC Fundamental

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

A) Average power

B) True power

C) Real power

D) all of the above

36 / 100

Category: Basic Electricity

36. Resistance of any circuit depends on –

A) Directly proportionate with length and cross sectional area

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

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

D) Inversely proportionate with length and cross sectional area

37 / 100

Category: Basic Electricity

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

A) It becomes half its original value

B) It becomes double its original value

C) It becomes infinity

D) It becomes zero

38 / 100

Category: AC Fundamental

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

A) 0.707

B) 1.41

C) 1

D) 1.11

39 / 100

Category: Magnetic Circuit

39. Paramagnetic materials are –

A) slightly attracted by a magnet

B) Strongly attracted by a magnet

C) none

D) strongly repelled by a magnet

40 / 100

Category: AC Fundamental

40. Reactive power is the product of

A) V, I, sin ø

B) V, I

C) V, I, cos ø

D) V, I, tan ø

41 / 100

Category: Basic Electricity

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

A) 18 ohm

B) 6 ohm

C) 9 ohm

D) 2 ohm

42 / 100

Category: Basic Electricity

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

A) 1,200 cycles

B) 1/100 cycle

C) 12 cycles

D) 120 cycles

43 / 100

Category: Basic Electricity

43. The resistance of straight conductor is independent of-

A) Material

B) Cross-sectional area

C) Shape of cross-section

D) Temperature

44 / 100

Category: Basic Electricity

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

A) 25.48 V

B) 6.37 V

C) 50.96 V

D) 14.14 V

45 / 100

Category: Circuit Theory & Network

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

A) none

B) True component of current

C) Watt-less component of current

D) Active component of current

46 / 100

Category: AC Fundamental

46. The frequency of an alternating current is –

A) The speed with which the alternator runs

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

C) The number of cycles generated in one minute

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

47 / 100

Category: AC Machines & Transformer

47. Transformer is a

A) Both A & C

B) AC Machine

C) Static device

D) DC Machine

48 / 100

Category: AC Fundamental

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

A) Reluctance and Permeance

B) Resistance and Reactance

C) Permeance and Susceptance

D) Conductance, Susceptance

49 / 100

Category: Magnetic Circuit

49. S.I unit of Reluctance-

A) AT/m

B) AT/Wb

C) N/Wb

D) AT

50 / 100

Category: AC Machines & Transformer

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

A) 66.7%

B) 100%

C) 57.7%

D) 75%

51 / 100

Category: Basic Electricity

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

A) all the three will glow

B) no bulb will glow

C) The other two lamps will glow

D) Total current in the circuit will increase

52 / 100

Category: Basic Electricity

52. 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. (a/l)

D) R=ρ. (l/a)

53 / 100

Category: AC Fundamental

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

A) 314 Hz

B) 75 Hz

C) 100 Hz

D) 50 Hz

54 / 100

Category: Basic Electricity

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

A) True

B) False

55 / 100

Category: Basic Electricity

55. Unit of resistivity is

A) Ohm-m²

B) Ohm/m

C) Ohm-m

D) Ohm

56 / 100

Category: Basic Electricity

56. S.I unit of Power is –

A) Coulomb

B) Watt

C) Joule

D) Watt-hr

57 / 100

Category: AC Fundamental

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

A) All of the above

B) 1/2 CV^2

C) 1/2 QV

D) Q^2 / 2C

58 / 100

Category: Basic Electricity

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

A) The amount of time the circuit

B) Proportional to the value of the resistors

C) Equal in all branches

D) Proportional to the power in the circuit

59 / 100

Category: Magnetic Circuit

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

A) Reluctance

B) Magnitude of current

C) number of turns in the circuit

D) either b or c

60 / 100

Category: Basic Electricity

60. The unit of frequency is the hertz

A) True

B) False

61 / 100

Category: Basic Electricity

61. 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) 12 A

B) Insufficient data provide

C) The largest one among the three values

D) 0 A

62 / 100

Category: AC Fundamental

62. The power factor of practical inductor is

A) Unity

B) Lagging

C) Zero

D) Leading

63 / 100

Category: Magnetic Circuit

63. Magnetic field strength is

A) N.i / L

B) N.i

C) None of these

D) N.ø/I

64 / 100

Category: Magnetic Circuit

64. Magnetic circuit is a closed path followed by –

A) None of these

B) flux

C) M.M.F

D) Flux density

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 Left-hand Rule

B) Thumb Rule

C) Lenz’s Law

D) Fleming’s Right-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) 0.81

B) 1

C) 1.111

D) 0.111

67 / 100

Category: Basic Electricity

67. The voltage across the open circuit is?

A) 0 V

B) Infinity

C) 100 V

D) 90 V

68 / 100

Category: Basic Electricity

68. Voltage across the 60 ohm resistor is______

A) 48 V

B) 120 V

C) 0 V

D) 72 V

69 / 100

Category: Basic Electricity

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

A) Atoms

B) positive charges

C) electrons

D) electrons & ions

70 / 100

Category: AC Fundamental

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

A) Current

B) Voltage

C) Charge transfers

D) Heating effect

71 / 100

Category: Basic Electricity

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

A) zero

B) high

C) Low

D) unity

72 / 100

Category: Basic Electricity

72. Which is the most cost efficient connection?

A) Either series or parallel

B) Parallel

C) Series

D) Neither series nor parallel

73 / 100

Category: Basic Electricity

73. 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

74 / 100

Category: AC Fundamental

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

A) High impedance

B) High Inductance

C) High capacitance

D) Low impedance

75 / 100

Category: DC Machines

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

A) Shunt motor

B) Compound motor

C) Series motor

D) Differential motor

76 / 100

Category: Basic Electricity

76. The voltage across the short is?

A) 11.25 V

B) Zero

C) 135 V

D) Infinity

77 / 100

Category: Magnetic Circuit

77. Magnetic field has -

A) Only direction

B) none

C) only magnitude

D) both magnitude & direction

78 / 100

Category: Basic Electricity

78. 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) 40°

B) 0°

C) None of the above

D) 45°

79 / 100

Category: Basic Electricity

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

A) True

B) False

80 / 100

Category: AC Fundamental

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

A) 70.7 A

B) 282.8 A

C) 150 A

D) 141 A

81 / 100

Category: Basic Electricity

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

A) The other two lamps will glow

B) no bulb will glow

C) all the three will glow

D) Total current in the circuit will increase

82 / 100

Category: AC Fundamental

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

A) 360°

B) 90°

C) 180°

D) 0°

83 / 100

Category: Basic Electricity

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

A) Insulators

B) Dielectrics

C) Semi-conductors

D) Conductors

84 / 100

Category: Basic Electricity

84. The total resistance between A and B are?

A) 0 ohm

B) 5 ohm

C) 20 ohm

D) 80 ohm

85 / 100

Category: Basic Electricity

85. The reciprocal of resistivity is________

A) Conductance

B) Resistance

C) Conductivity

D) Impedance

86 / 100

Category: Magnetic Circuit

86. The unit of magnetic flux is –

A) Tesla

B) Weber

C) Ampere turns

D) Henry

87 / 100

Category: Basic Electricity

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

A) Null

B) The value of the source voltage

C) Infinite

D) Zero

88 / 100

Category: AC Fundamental

88. The length of a phasor represents the amplitude

A) True

B) False

89 / 100

Category: DC Machines

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

A) Left hand thumb rule

B) Flemmings Left hand rule

C) Flemmings Right hand rule

D) Pulm rule

90 / 100

Category: AC Fundamental

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

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

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

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

D) None

91 / 100

Category: AC Fundamental

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

A) Current

B) Charge transfers

C) Voltage

D) Heating effect

92 / 100

Category: Basic Electricity

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

A) 100 A

B) 7.07 A

C) 70.72 A

D) 707.2 A

93 / 100

Category: Basic Electricity

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

A) 15 ohm

B) 25 ohm

C) 75 ohm

D) 55 ohm

94 / 100

Category: Circuit Theory & Network

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

A) Bandwidth

B) None

C) Resonant frequency

D) Q

95 / 100

Category: Magnetic Circuit

95. 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) Mutual inductance

C) Capacitance

D) None

96 / 100

Category: Basic Electricity

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

A) No bulb will glow

B) Total current in the circuit will increase

C) All the three will glow

D) The other two lamps will glow

97 / 100

Category: AC Fundamental

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

A) 0.05 sec

B) 0.06 sec

C) 0.04 sec

D) 0.01 sec

98 / 100

Category: Magnetic Circuit

98. 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) LI^2/ 2t

B) L / 2It

C) LI / 2t

D) L / 2I^2 t

99 / 100

Category: Basic Electricity

99. The Inductor doesn’t allow sudden changes in

A) Inductance

B) Voltage

C) Resistance

D) Current

100 / 100

Category: DC Machines

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

A) Generator

B) Choke

C) Transformer

D) Thermo-couple

Your score is

The average score is 29%

SSC Junior Engineer (Electrical) Free Mock Test Series

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