SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

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: Magnetic Circuit

1. 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 / 2It

B) L / 2I^2 t

C) LI^2/ 2t

D) LI / 2t

2 / 100

Category: AC Fundamental

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

A) 60 Hz

B) 25 Hz

C) None

D) 50 Hz

3 / 100

Category: Basic Electricity

3. The voltage across the short is?

A) Infinity

B) Zero

C) 11.25 V

D) 135 V

4 / 100

Category: AC Machines & Transformer

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

A) 57.7%

B) 66.7%

C) 75%

D) 100%

5 / 100

Category: AC Fundamental

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

A) 1/2 CV^2

B) Q^2 / 2C

C) 1/2 QV

D) All of the above

6 / 100

Category: AC Fundamental

6. The power factor of practical inductor is

A) Lagging

B) Unity

C) Leading

D) Zero

7 / 100

Category: AC Fundamental

7. Reactive power is the product of

A) V, I, cos ø

B) V, I, sin ø

C) V, I

D) V, I, tan ø

8 / 100

Category: Basic Electricity

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

A) R= a/( ρ.l)

B) R= l/( ρ.a)

C) R=ρ. (l/a)

D) R= ρ. (a/l)

9 / 100

Category: Magnetic Circuit

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

A) The piece of metal will lose it magnetism

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

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

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

10 / 100

Category: Basic Electricity

10. The voltage across the open circuit is?

A) 100 V

B) 90 V

C) Infinity

D) 0 V

11 / 100

Category: AC Fundamental

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

A) Voltage

B) Charge transfers

C) Heating effect

D) Current

12 / 100

Category: AC Fundamental

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

A) 1.11

B) 1.41

C) 1

D) 0.707

13 / 100

Category: Basic Electricity

13. 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

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) Mutual inductance

B) None

C) Capacitance

D) Self-inductance

15 / 100

Category: Basic Electricity

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

A) Q + v

B) Qv

C) Q-v

D) Q/v

16 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Heating effect

C) Current

D) Voltage

17 / 100

Category: AC Fundamental

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

A) Voltage

B) Charge transfer

C) Heating effect

D) Current

18 / 100

Category: AC Fundamental

18. Unit of impedance is

A) Ohm

B) Farad

C) Mho

D) Henry

19 / 100

Category: Basic Electricity

19. 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) Total current in the circuit will increase

D) The other two lamps will glow

20 / 100

Category: Basic Electricity

20. Unit of resistivity is

A) Ohm

B) Ohm-m²

C) Ohm-m

D) Ohm/m

21 / 100

Category: Basic Electricity

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

A) True power

B) none of the above

C) Apparent power

D) Reactive power

22 / 100

Category: AC Fundamental

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

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

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

C) None

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

23 / 100

Category: Magnetic Circuit

23. 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

24 / 100

Category: Basic Electricity

24. 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

25 / 100

Category: DC Machines

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

A) Transformer

B) Generator

C) Choke

D) Thermo-couple

26 / 100

Category: Magnetic Circuit

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

A) Flux magnitude

B) Rate of change of flux

C) None

D) Coil resistance

27 / 100

Category: Circuit Theory & Network

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

A) Q

B) Resonant frequency

C) Bandwidth

D) None

28 / 100

Category: Basic Electricity

28. S.I unit of conductance is –

A) Ohm-m

B) Ohm

C) Mho

D) Mho-m

29 / 100

Category: Magnetic Circuit

29. Which of the following is unit less?

A) Permittivity

B) Permeability

C) Magnetic susceptibility

D) Moment of Magnet

30 / 100

Category: AC Fundamental

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

A) Resistance and Reactance

B) Permeance and Susceptance

C) Reluctance and Permeance

D) Conductance, Susceptance

31 / 100

Category: Basic Electricity

31. The reciprocal of resistivity is________

A) Impedance

B) Resistance

C) Conductivity

D) Conductance

32 / 100

Category: AC Fundamental

32. The power factor of an ordinary electric bulb is

A) Slightly less than unity

B) Slightly more than unity

C) Zero

D) Unity

33 / 100

Category: AC Fundamental

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

A) 314 Hz

B) 75 Hz

C) 50 Hz

D) 100 Hz

34 / 100

Category: Basic Electricity

34. Many resistors connected in series will?

A) Reduce the power to zero

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

C) Divide the voltage proportionally among all the resistor

D) Divide the current proportionally

35 / 100

Category: Basic Electricity

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

A) No bulb will glow

B) The other two lamps will glow

C) All the three will glow

D) Total current in the circuit will increase

36 / 100

Category: AC Fundamental

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

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

B) Less insulation is required in case of AC

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

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

37 / 100

Category: Basic Electricity

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

A) 25 ohm

B) 75 ohm

C) 15 ohm

D) 55 ohm

38 / 100

Category: AC Fundamental

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

A) 0.01 sec

B) 0.05 sec

C) 0.06 sec

D) 0.04 sec

39 / 100

Category: Basic Electricity

39. 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) 0 A

B) Insufficient data provide

C) 12 A

D) The largest one among the three values

40 / 100

Category: Magnetic Circuit

40. 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

41 / 100

Category: Magnetic Circuit

41. The principle of electromagnetic induction was propounded by

A) Orsted

B) Flemmings

C) Edison

D) Faraday

42 / 100

Category: Circuit Theory & Network

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

A) True component of current

B) Active component of current

C) none

D) Watt-less component of current

43 / 100

Category: Magnetic Circuit

43. Magnetic circuit is a closed path followed by –

A) flux

B) M.M.F

C) Flux density

D) None of these

44 / 100

Category: Basic Electricity

44. What is the resistivity of Copper?

A) 2.7×10^-8 ohm-m

B) 1.59×10^-8 ohm-m

C) 5.35×10^-8 ohm-m

D) 7.3×10^-8 ohm-m

45 / 100

Category: Basic Electricity

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

A) R= a/( ρ.l)

B) R= l/( ρ.a)

C) R=ρ. (l/a)

D) R= ρ. (a/l)

46 / 100

Category: Magnetic Circuit

46. Magnetic lines of forces –

A) never intersect

B) often intersect

C) intersect only in some special circumstances

D) are not predictable

47 / 100

Category: Basic Electricity

47. 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

48 / 100

Category: Magnetic Circuit

48. The reciprocal of permeability is –

A) Conductivity

B) reluctivity

C) MMF

D) Resistivity

49 / 100

Category: Basic Electricity

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

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

50 / 100

Category: Magnetic Circuit

50. The unit of magnetic flux is –

A) Henry

B) Ampere turns

C) Tesla

D) Weber

51 / 100

Category: Basic Electricity

51. The Inductor doesn’t allow sudden changes in

A) Resistance

B) Current

C) Inductance

D) Voltage

52 / 100

Category: AC Fundamental

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

A) 0°

B) 180°

C) 360°

D) 90°

53 / 100

Category: Basic Electricity

53. 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) all the three will glow

C) no bulb will glow

D) Total current in the circuit will increase

54 / 100

Category: Magnetic Circuit

54. Magnetic field is proportional to the –

A) direction of electric charges

B) all of these

C) Speed of electric charges

D) Quality of electric charges

55 / 100

Category: Basic Electricity

55. S.I unit of Power is –

A) Coulomb

B) Watt-hr

C) Joule

D) Watt

56 / 100

Category: Magnetic Circuit

56. Magnetic field strength is

A) N.i / L

B) None of these

C) N.i

D) N.ø/I

57 / 100

Category: Basic Electricity

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

A) electrons & ions

B) electrons

C) positive charges

D) Atoms

58 / 100

Category: Basic Electricity

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

A) 12 cycles

B) 120 cycles

C) 1/100 cycle

D) 1,200 cycles

59 / 100

Category: Basic Electricity

59. Which is the most cost efficient connection?

A) Parallel

B) Either series or parallel

C) Neither series nor parallel

D) Series

60 / 100

Category: Magnetic Circuit

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

A) WB/m²

B) Oersted

C) Tesla

D) Both A & B

61 / 100

Category: Basic Electricity

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

A) False

B) True

62 / 100

Category: AC Fundamental

62. The frequency of an alternating current is –

A) The number of cycles generated in one minute

B) The speed with which the alternator runs

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

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

63 / 100

Category: DC Machines

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

A) Differential motor

B) Series motor

C) Compound motor

D) Shunt motor

64 / 100

Category: Basic Electricity

64. The total resistance between A and B are?

A) 0 ohm

B) 80 ohm

C) 20 ohm

D) 5 ohm

65 / 100

Category: Magnetic Circuit

65. Magnetic lines of forces –

A) Intersect only in some special circumstances.

B) Never intersect

C) Often intersect

D) Are not predictable

66 / 100

Category: Basic Electricity

66. Voltage across the 60 ohm resistor is______

A) 72 V

B) 120 V

C) 0 V

D) 48 V

67 / 100

Category: Basic Electricity

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

A) Dielectrics

B) Conductors

C) Semi-conductors

D) Insulators

68 / 100

Category: AC Fundamental

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

A) Real power

B) True power

C) Average power

D) all of the above

69 / 100

Category: Circuit Theory & Network

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

A) 0.81

B) 1

C) 0.111

D) 1.111

70 / 100

Category: DC Machines

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

A) Flemmings Right hand rule

B) Flemmings Left hand rule

C) Left hand thumb rule

D) Pulm rule

71 / 100

Category: Basic Electricity

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

A) Zero

B) The value of the source voltage

C) Null

D) Infinite

72 / 100

Category: Basic Electricity

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

A) high

B) zero

C) unity

D) Low

73 / 100

Category: AC Machines & Transformer

73. Transformer is a

A) AC Machine

B) Static device

C) Both A & C

D) DC Machine

74 / 100

Category: Basic Electricity

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

A) Coulomb, Faraday

B) Henry, Coulomb

C) Faraday, Henry

D) Henry, Faraday

75 / 100

Category: Basic Electricity

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

A) Resistivity depend on area of cross section

B) Resistance depends on the temperature

C) Resistance does not depend on the temperature

D) Resistivity depend on the length

76 / 100

Category: Basic Electricity

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

A) False

B) True

77 / 100

Category: Basic Electricity

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

A) 707.2 A

B) 100 A

C) 7.07 A

D) 70.72 A

78 / 100

Category: DC Machines

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

A) Fleming’s Right-hand Rule

B) Fleming’s Left-hand Rule

C) Lenz’s Law

D) Thumb Rule

79 / 100

Category: Basic Electricity

79. The resistance of straight conductor is independent of-

A) Material

B) Temperature

C) Cross-sectional area

D) Shape of cross-section

80 / 100

Category: Magnetic Circuit

80. S.I unit of Reluctance-

A) AT/Wb

B) N/Wb

C) AT/m

D) AT

81 / 100

Category: Basic Electricity

81. The expression for energy of an inductor

A) L/2I

B) ½ L^2.I

C) ½ LI

D) ½ LI^2

82 / 100

Category: Transformer

82. Transformer core are laminated in order to reduce –

A) Hysteresis loss

B) Eddy current loss

C) Core loss

D) Friction & windage loss

83 / 100

Category: Basic Electricity

83. 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) 45°

B) 40°

C) 0°

D) None of the above

84 / 100

Category: AC Fundamental

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

A) High Inductance

B) Low impedance

C) High impedance

D) High capacitance

85 / 100

Category: AC Fundamental

85. 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

86 / 100

Category: Basic Electricity

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

A) ohm/meter

B) ohm-meter

C) ohm-meter^2

D) ohm/meter^2

87 / 100

Category: Basic Electricity

87. The unit of frequency is the hertz

A) False

B) True

88 / 100

Category: Basic Electricity

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

A) Dielectric

B) Capacitive medium

C) Conducting medium

D) Electrode

89 / 100

Category: Magnetic Circuit

89. Magnetic field has -

A) only magnitude

B) none

C) both magnitude & direction

D) Only direction

90 / 100

Category: Basic Electricity

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

A) It becomes infinity

B) It becomes double its original value

C) It becomes half its original value

D) It becomes zero

91 / 100

Category: Magnetic Circuit

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

A) Coulomb

B) Faraday

C) Newton

D) Lenz

92 / 100

Category: AC Fundamental

92. The length of a phasor represents the amplitude

A) True

B) False

93 / 100

Category: AC Fundamental

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

A) None of these

B) 0 and 1

C) -1 and 1

D) 0 and -1

94 / 100

Category: DC Machines

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

A) Palm rule

B) Left hand thumb rule

C) Flemmings Left hand rule

D) Flemmings Right hand rule

95 / 100

Category: Basic Electricity

95. Resistance of any circuit depends on –

A) Directly proportionate with length and cross sectional area

B) Inversely 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

96 / 100

Category: Basic Electricity

96. The energy per unit charge is

A) Voltage

B) Work

C) Power

D) Current

97 / 100

Category: Basic Electricity

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

A) Proportional to the power in the circuit

B) The amount of time the circuit

C) Equal in all branches

D) Proportional to the value of the resistors

98 / 100

Category: Basic Electricity

98. The capacitor doesn’t allow sudden changes in

A) Voltage

B) Current

C) Resistance

D) Capacitance

99 / 100

Category: Magnetic Circuit

99. Paramagnetic materials are –

A) none

B) strongly repelled by a magnet

C) Strongly attracted by a magnet

D) slightly attracted by a magnet

100 / 100

Category: AC Fundamental

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

A) 70.7 A

B) 282.8 A

C) 141 A

D) 150 A

Your score is

The average score is 28%

SSC JE Electrical / Mock Test Series : 2

SSC Junior Engineer (Electrical) Free Mock Test Series

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