SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

1123

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. The unit of magnetic flux is –

A) Ampere turns

B) Weber

C) Tesla

D) Henry

2 / 100

Category: Basic Electricity

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

A) unity

B) zero

C) high

D) Low

3 / 100

Category: Basic Electricity

3. The expression for energy of an inductor

A) L/2I

B) ½ LI^2

C) ½ LI

D) ½ L^2.I

4 / 100

Category: Basic Electricity

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

A) 12 cycles

B) 1/100 cycle

C) 120 cycles

D) 1,200 cycles

5 / 100

Category: AC Fundamental

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

A) Heating effect

B) Current

C) Voltage

D) Charge transfers

6 / 100

Category: Magnetic Circuit

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

A) Magnitude of current

B) number of turns in the circuit

C) either b or c

D) Reluctance

7 / 100

Category: Basic Electricity

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

A) Henry, Faraday

B) Henry, Coulomb

C) Coulomb, Faraday

D) Faraday, Henry

8 / 100

Category: AC Fundamental

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

A) 50 Hz

B) 75 Hz

C) 100 Hz

D) 314 Hz

9 / 100

Category: AC Fundamental

9. Reactive power is the product of

A) V, I

B) V, I, cos ø

C) V, I, tan ø

D) V, I, sin ø

10 / 100

Category: Basic Electricity

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

A) ohm-meter^2

B) ohm-meter

C) ohm/meter^2

D) ohm/meter

11 / 100

Category: DC Machines

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

A) Pulm rule

B) Flemmings Left hand rule

C) Left hand thumb rule

D) Flemmings Right hand rule

12 / 100

Category: Basic Electricity

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

A) Electrode

B) Dielectric

C) Capacitive medium

D) Conducting medium

13 / 100

Category: Basic Electricity

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

A) 15 ohm

B) 55 ohm

C) 25 ohm

D) 75 ohm

14 / 100

Category: Basic Electricity

14. 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

15 / 100

Category: AC Fundamental

15. Unit of impedance is

A) Henry

B) Farad

C) Ohm

D) Mho

16 / 100

Category: Basic Electricity

16. 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) Total current in the circuit will increase

C) no bulb will glow

D) The other two lamps will glow

17 / 100

Category: Basic Electricity

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

A) none of the above

B) Reactive power

C) Apparent power

D) True power

18 / 100

Category: AC Fundamental

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

A) 1.41

B) 1

C) 1.11

D) 0.707

19 / 100

Category: Basic Electricity

19. 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 resistivity of the wire

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

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

20 / 100

Category: Circuit Theory & Network

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

A) Q

B) None

C) Bandwidth

D) Resonant frequency

21 / 100

Category: Magnetic Circuit

21. Magnetic lines of forces –

A) Often intersect

B) Are not predictable

C) Intersect only in some special circumstances.

D) Never intersect

22 / 100

Category: Magnetic Circuit

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

A) Rate of change of flux

B) Flux magnitude

C) None

D) Coil resistance

23 / 100

Category: AC Fundamental

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

A) High Inductance

B) High capacitance

C) High impedance

D) Low impedance

24 / 100

Category: Basic Electricity

24. The Inductor doesn’t allow sudden changes in

A) Resistance

B) Voltage

C) Inductance

D) Current

25 / 100

Category: AC Machines & Transformer

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

A) 75%

B) 57.7%

C) 66.7%

D) 100%

26 / 100

Category: AC Fundamental

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

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

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

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

27 / 100

Category: Basic Electricity

27. What is the resistivity of Copper?

A) 1.59×10^-8 ohm-m

B) 5.35×10^-8 ohm-m

C) 7.3×10^-8 ohm-m

D) 2.7×10^-8 ohm-m

28 / 100

Category: Circuit Theory & Network

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

A) True component of current

B) none

C) Active component of current

D) Watt-less component of current

29 / 100

Category: Basic Electricity

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

A) Resistance does not depend on the temperature

B) Resistivity depend on area of cross section

C) Resistance depends on the temperature

D) Resistivity depend on the length

30 / 100

Category: Basic Electricity

30. The capacitor doesn’t allow sudden changes in

A) Current

B) Voltage

C) Resistance

D) Capacitance

31 / 100

Category: Magnetic Circuit

31. Magnetic circuit is a closed path followed by –

A) flux

B) M.M.F

C) None of these

D) Flux density

32 / 100

Category: Basic Electricity

32. Resistance of any circuit depends on –

A) Directly proportionate with length and cross sectional area

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

C) Inversely proportionate with length and cross sectional area

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

33 / 100

Category: Magnetic Circuit

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

A) Faraday

B) Newton

C) Lenz

D) Coulomb

34 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Heating effect

C) Voltage

D) Current

35 / 100

Category: Magnetic Circuit

35. Paramagnetic materials are –

A) none

B) slightly attracted by a magnet

C) strongly repelled by a magnet

D) Strongly attracted by a magnet

36 / 100

Category: Basic Electricity

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

A) True

B) False

37 / 100

Category: Magnetic Circuit

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

A) WB/m²

B) Oersted

C) Tesla

D) Both A & B

38 / 100

Category: Transformer

38. Transformer core are laminated in order to reduce –

A) Eddy current loss

B) Core loss

C) Hysteresis loss

D) Friction & windage loss

39 / 100

Category: Basic Electricity

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

A) Qv

B) Q-v

C) Q + v

D) Q/v

40 / 100

Category: AC Machines & Transformer

40. Transformer is a

A) Static device

B) Both A & C

C) AC Machine

D) DC Machine

41 / 100

Category: Basic Electricity

41. The reciprocal of resistivity is________

A) Impedance

B) Conductivity

C) Conductance

D) Resistance

42 / 100

Category: AC Fundamental

42. The power factor of practical inductor is

A) Lagging

B) Zero

C) Leading

D) Unity

43 / 100

Category: Basic Electricity

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

A) The value of the source voltage

B) Null

C) Zero

D) Infinite

44 / 100

Category: AC Fundamental

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

A) 282.8 V

B) 200 V

C) 127.4 V

D) 141.4 V

45 / 100

Category: Basic Electricity

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

A) electrons & ions

B) Atoms

C) positive charges

D) electrons

46 / 100

Category: AC Fundamental

46. The power factor of an ordinary electric bulb is

A) Slightly more than unity

B) Zero

C) Unity

D) Slightly less than unity

47 / 100

Category: Magnetic Circuit

47. Magnetic field strength is

A) None of these

B) N.ø/I

C) N.i

D) N.i / L

48 / 100

Category: AC Fundamental

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

A) Reluctance and Permeance

B) Conductance, Susceptance

C) Resistance and Reactance

D) Permeance and Susceptance

49 / 100

Category: AC Fundamental

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

A) 90°

B) 180°

C) 0°

D) 360°

50 / 100

Category: Magnetic Circuit

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

A) Faraday's Left Hand Rule

B) Faraday's Right Hand Rule

C) Fleming's Right Hand Rule

D) Fleming's Left Hand Rule

51 / 100

Category: Basic Electricity

51. The unit of frequency is the hertz

A) True

B) False

52 / 100

Category: Basic Electricity

52. Which is the most cost efficient connection?

A) Neither series nor parallel

B) Parallel

C) Series

D) Either series or parallel

53 / 100

Category: AC Fundamental

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

A) All of the above

B) 1/2 CV^2

C) Q^2 / 2C

D) 1/2 QV

54 / 100

Category: Basic Electricity

54. 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

55 / 100

Category: Basic Electricity

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

A) R= l/( ρ.a)

B) R=ρ. (l/a)

C) R= ρ. (a/l)

D) R= a/( ρ.l)

56 / 100

Category: Basic Electricity

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

A) It becomes zero

B) It becomes double its original value

C) It becomes half its original value

D) It becomes infinity

57 / 100

Category: Basic Electricity

57. The voltage across the short is?

A) 135 V

B) Infinity

C) Zero

D) 11.25 V

58 / 100

Category: Magnetic Circuit

58. Magnetic lines of forces –

A) often intersect

B) never intersect

C) are not predictable

D) intersect only in some special circumstances

59 / 100

Category: Basic Electricity

59. Many resistors connected in series will?

A) Divide the voltage proportionally among all the resistor

B) Reduce the power to zero

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

D) Divide the current proportionally

60 / 100

Category: DC Machines

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

A) Left hand thumb rule

B) Flemmings Right hand rule

C) Palm rule

D) Flemmings Left hand rule

61 / 100

Category: Magnetic Circuit

61. 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 / 2t

B) L / 2It

C) L / 2I^2 t

D) LI^2/ 2t

62 / 100

Category: AC Fundamental

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

A) Heating effect

B) Voltage

C) Current

D) Charge transfer

63 / 100

Category: AC Fundamental

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

A) 0.06 sec

B) 0.01 sec

C) 0.04 sec

D) 0.05 sec

64 / 100

Category: Magnetic Circuit

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

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

B) The piece of metal will lose it magnetism

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

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

65 / 100

Category: Basic Electricity

65. S.I unit of Power is –

A) Watt-hr

B) Joule

C) Coulomb

D) Watt

66 / 100

Category: Basic Electricity

66. S.I unit of conductance is –

A) Ohm

B) Ohm-m

C) Mho-m

D) Mho

67 / 100

Category: Magnetic Circuit

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

A) None

B) Mutual inductance

C) Self-inductance

D) Capacitance

68 / 100

Category: Basic Electricity

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

A) R= l/( ρ.a)

B) R= ρ. (a/l)

C) R=ρ. (l/a)

D) R= a/( ρ.l)

69 / 100

Category: Magnetic Circuit

69. Which of the following is unit less?

A) Permittivity

B) Permeability

C) Magnetic susceptibility

D) Moment of Magnet

70 / 100

Category: Magnetic Circuit

70. The principle of electromagnetic induction was propounded by

A) Edison

B) Faraday

C) Orsted

D) Flemmings

71 / 100

Category: Circuit Theory & Network

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

A) 0.111

B) 1

C) 0.81

D) 1.111

72 / 100

Category: Basic Electricity

72. The total resistance between A and B are?

A) 20 ohm

B) 5 ohm

C) 80 ohm

D) 0 ohm

73 / 100

Category: AC Fundamental

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

A) all of the above

B) Average power

C) Real power

D) True power

74 / 100

Category: Basic Electricity

74. Unit of resistivity is

A) Ohm-m

B) Ohm-m²

C) Ohm

D) Ohm/m

75 / 100

Category: AC Fundamental

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

D) None

76 / 100

Category: Basic Electricity

76. 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

77 / 100

Category: Basic Electricity

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

A) False

B) True

78 / 100

Category: Basic Electricity

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

A) 7.07 A

B) 70.72 A

C) 707.2 A

D) 100 A

79 / 100

Category: Magnetic Circuit

79. Magnetic field has -

A) none

B) only magnitude

C) Only direction

D) both magnitude & direction

80 / 100

Category: Basic Electricity

80. 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) All the three will glow

D) The other two lamps will glow

81 / 100

Category: AC Fundamental

81. The frequency of an alternating current is –

A) The speed with which the alternator runs

B) The number of cycles generated in one minute

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

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

82 / 100

Category: Basic Electricity

82. The resistance of straight conductor is independent of-

A) Material

B) Temperature

C) Shape of cross-section

D) Cross-sectional area

83 / 100

Category: Basic Electricity

83. The voltage across the open circuit is?

A) 100 V

B) 90 V

C) Infinity

D) 0 V

84 / 100

Category: Magnetic Circuit

84. The reciprocal of permeability is –

A) MMF

B) Conductivity

C) reluctivity

D) Resistivity

85 / 100

Category: Basic Electricity

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

A) 9 ohm

B) 6 ohm

C) 18 ohm

D) 2 ohm

86 / 100

Category: Basic Electricity

86. 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) The largest one among the three values

D) 12 A

87 / 100

Category: Basic Electricity

87. The energy per unit charge is

A) Voltage

B) Work

C) Current

D) Power

88 / 100

Category: Basic Electricity

88. Voltage across the 60 ohm resistor is______

A) 0 V

B) 120 V

C) 48 V

D) 72 V

89 / 100

Category: DC Machines

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

A) Differential motor

B) Compound motor

C) Shunt motor

D) Series motor

90 / 100

Category: DC Machines

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

A) Thermo-couple

B) Generator

C) Transformer

D) Choke

91 / 100

Category: Magnetic Circuit

91. S.I unit of Reluctance-

A) AT

B) AT/m

C) AT/Wb

D) N/Wb

92 / 100

Category: Basic Electricity

92. 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

93 / 100

Category: AC Fundamental

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

A) 150 A

B) 70.7 A

C) 141 A

D) 282.8 A

94 / 100

Category: Magnetic Circuit

94. 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

95 / 100

Category: AC Fundamental

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

A) None of these

B) -1 and 1

C) 0 and 1

D) 0 and -1

96 / 100

Category: Basic Electricity

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

A) 25.48 V

B) 50.96 V

C) 6.37 V

D) 14.14 V

97 / 100

Category: DC Machines

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

A) Lenz’s Law

B) Fleming’s Right-hand Rule

C) Thumb Rule

D) Fleming’s Left-hand Rule

98 / 100

Category: AC Fundamental

98. The length of a phasor represents the amplitude

A) False

B) True

99 / 100

Category: Basic Electricity

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

A) Semi-conductors

B) Dielectrics

C) Insulators

D) Conductors

100 / 100

Category: AC Fundamental

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

A) 25 Hz

B) 50 Hz

C) 60 Hz

D) None

Your score is

The average score is 28%

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