SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

1027

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. What is the resistivity of Copper?

A) 5.35×10^-8 ohm-m

B) 7.3×10^-8 ohm-m

C) 1.59×10^-8 ohm-m

D) 2.7×10^-8 ohm-m

2 / 100

Category: DC Machines

2. 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) Fleming’s Left-hand Rule

D) Lenz’s Law

3 / 100

Category: Magnetic Circuit

3. 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 / 2I^2 t

C) L / 2It

D) LI^2/ 2t

4 / 100

Category: Basic Electricity

4. Unit of resistivity is

A) Ohm-m

B) Ohm

C) Ohm-m²

D) Ohm/m

5 / 100

Category: Magnetic Circuit

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

A) Faraday's Right Hand Rule

B) Fleming's Left Hand Rule

C) Fleming's Right Hand Rule

D) Faraday's Left Hand Rule

6 / 100

Category: DC Machines

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

A) Palm rule

B) Flemmings Left hand rule

C) Left hand thumb rule

D) Flemmings Right hand rule

7 / 100

Category: AC Fundamental

7. Reactive power is the product of

A) V, I, tan ø

B) V, I

C) V, I, sin ø

D) V, I, cos ø

8 / 100

Category: Basic Electricity

8. S.I unit of conductance is –

A) Ohm

B) Mho-m

C) Ohm-m

D) Mho

9 / 100

Category: Magnetic Circuit

9. Magnetic field has -

A) Only direction

B) none

C) only magnitude

D) both magnitude & direction

10 / 100

Category: AC Fundamental

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

A) Charge transfer

B) Current

C) Heating effect

D) Voltage

11 / 100

Category: AC Fundamental

11. 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

12 / 100

Category: Magnetic Circuit

12. S.I unit of Reluctance-

A) AT/m

B) N/Wb

C) AT/Wb

D) AT

13 / 100

Category: Basic Electricity

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

A) Dielectric

B) Capacitive medium

C) Electrode

D) Conducting medium

14 / 100

Category: Magnetic Circuit

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

A) number of turns in the circuit

B) either b or c

C) Magnitude of current

D) Reluctance

15 / 100

Category: Magnetic Circuit

15. Magnetic lines of forces –

A) Intersect only in some special circumstances.

B) Are not predictable

C) Often intersect

D) Never intersect

16 / 100

Category: Basic Electricity

16. 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= a/( ρ.l)

D) R=ρ. (l/a)

17 / 100

Category: Basic Electricity

17. The unit of frequency is the hertz

A) False

B) True

18 / 100

Category: Magnetic Circuit

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

A) Coil resistance

B) Flux magnitude

C) Rate of change of flux

D) None

19 / 100

Category: Basic Electricity

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

A) R= a/( ρ.l)

B) R= ρ. (a/l)

C) R= l/( ρ.a)

D) R=ρ. (l/a)

20 / 100

Category: Basic Electricity

20. The capacitor doesn’t allow sudden changes in

A) Current

B) Capacitance

C) Resistance

D) Voltage

21 / 100

Category: Basic Electricity

21. Voltage across the 60 ohm resistor is______

A) 0 V

B) 48 V

C) 120 V

D) 72 V

22 / 100

Category: Magnetic Circuit

22. The unit of magnetic flux is –

A) Ampere turns

B) Henry

C) Weber

D) Tesla

23 / 100

Category: Basic Electricity

23. 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 cross sectional area

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

24 / 100

Category: Magnetic Circuit

24. 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

25 / 100

Category: AC Fundamental

25. 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

26 / 100

Category: Basic Electricity

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

A) True

B) False

27 / 100

Category: Basic Electricity

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

A) Equal in all branches

B) Proportional to the power in the circuit

C) The amount of time the circuit

D) Proportional to the value of the resistors

28 / 100

Category: Magnetic Circuit

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

A) Both A & B

B) WB/m²

C) Oersted

D) Tesla

29 / 100

Category: Basic Electricity

29. The resistance of straight conductor is independent of-

A) Material

B) Shape of cross-section

C) Cross-sectional area

D) Temperature

30 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Current

C) Voltage

D) Heating effect

31 / 100

Category: Basic Electricity

31. Which is the most cost efficient connection?

A) Neither series nor parallel

B) Either series or parallel

C) Parallel

D) Series

32 / 100

Category: AC Fundamental

32. Unit of impedance is

A) Ohm

B) Henry

C) Farad

D) Mho

33 / 100

Category: Basic Electricity

33. The voltage across the open circuit is?

A) 0 V

B) Infinity

C) 90 V

D) 100 V

34 / 100

Category: Basic Electricity

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

A) It becomes infinity

B) It becomes half its original value

C) It becomes zero

D) It becomes double its original value

35 / 100

Category: AC Fundamental

35. 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

36 / 100

Category: Basic Electricity

36. Many resistors connected in series will?

A) Reduce the power to zero

B) Divide the voltage proportionally among all the resistor

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

D) Divide the current proportionally

37 / 100

Category: Circuit Theory & Network

37. 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

38 / 100

Category: Basic Electricity

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

A) zero

B) Low

C) unity

D) high

39 / 100

Category: AC Fundamental

39. 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 number of electrons passing through a point in one second

D) The speed with which the alternator runs

40 / 100

Category: Basic Electricity

40. 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

41 / 100

Category: DC Machines

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

A) Series motor

B) Shunt motor

C) Compound motor

D) Differential motor

42 / 100

Category: Basic Electricity

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

A) 1/100 cycle

B) 12 cycles

C) 120 cycles

D) 1,200 cycles

43 / 100

Category: DC Machines

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

A) Choke

B) Transformer

C) Thermo-couple

D) Generator

44 / 100

Category: Basic Electricity

44. 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

45 / 100

Category: AC Fundamental

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

A) 0 and 1

B) 0 and -1

C) -1 and 1

D) None of these

46 / 100

Category: Circuit Theory & Network

46. 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

47 / 100

Category: Basic Electricity

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

A) 55 ohm

B) 75 ohm

C) 25 ohm

D) 15 ohm

48 / 100

Category: Basic Electricity

48. 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°

49 / 100

Category: Basic Electricity

49. The Inductor doesn’t allow sudden changes in

A) Voltage

B) Inductance

C) Current

D) Resistance

50 / 100

Category: Magnetic Circuit

50. Paramagnetic materials are –

A) Strongly attracted by a magnet

B) none

C) strongly repelled by a magnet

D) slightly attracted by a magnet

51 / 100

Category: Basic Electricity

51. 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

52 / 100

Category: AC Fundamental

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

A) 0.01 sec

B) 0.05 sec

C) 0.04 sec

D) 0.06 sec

53 / 100

Category: AC Fundamental

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

A) True power

B) Average power

C) Real power

D) all of the above

54 / 100

Category: Transformer

54. Transformer core are laminated in order to reduce –

A) Eddy current loss

B) Friction & windage loss

C) Core loss

D) Hysteresis loss

55 / 100

Category: Magnetic Circuit

55. Which of the following is unit less?

A) Permeability

B) Permittivity

C) Moment of Magnet

D) Magnetic susceptibility

56 / 100

Category: Basic Electricity

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

A) Conductors

B) Insulators

C) Dielectrics

D) Semi-conductors

57 / 100

Category: AC Fundamental

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

A) 1.41

B) 0.707

C) 1.11

D) 1

58 / 100

Category: Basic Electricity

58. 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) Total current in the circuit will increase

C) All the three will glow

D) No bulb will glow

59 / 100

Category: Magnetic Circuit

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

A) Lenz

B) Newton

C) Coulomb

D) Faraday

60 / 100

Category: Magnetic Circuit

60. Magnetic field strength is

A) None of these

B) N.i

C) N.ø/I

D) N.i / L

61 / 100

Category: Basic Electricity

61. The expression for energy of an inductor

A) L/2I

B) ½ LI^2

C) ½ L^2.I

D) ½ LI

62 / 100

Category: AC Fundamental

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

A) 127.4 V

B) 200 V

C) 282.8 V

D) 141.4 V

63 / 100

Category: Magnetic Circuit

63. The reciprocal of permeability is –

A) Conductivity

B) reluctivity

C) Resistivity

D) MMF

64 / 100

Category: Basic Electricity

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

A) Q + v

B) Q-v

C) Q/v

D) Qv

65 / 100

Category: Basic Electricity

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

A) Henry, Faraday

B) Henry, Coulomb

C) Coulomb, Faraday

D) Faraday, Henry

66 / 100

Category: AC Fundamental

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

C) Less insulation is required in case of AC

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

67 / 100

Category: Magnetic Circuit

67. Magnetic circuit is a closed path followed by –

A) None of these

B) M.M.F

C) flux

D) Flux density

68 / 100

Category: Basic Electricity

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

A) ohm-meter

B) ohm/meter^2

C) ohm/meter

D) ohm-meter^2

69 / 100

Category: Basic Electricity

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

A) False

B) True

70 / 100

Category: AC Fundamental

70. The power factor of practical inductor is

A) Unity

B) Zero

C) Lagging

D) Leading

71 / 100

Category: Basic Electricity

71. 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

72 / 100

Category: AC Fundamental

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

A) Conductance, Susceptance

B) Reluctance and Permeance

C) Permeance and Susceptance

D) Resistance and Reactance

73 / 100

Category: Magnetic Circuit

73. 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) Capacitance

C) Mutual inductance

D) Self-inductance

74 / 100

Category: AC Fundamental

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

A) 100 Hz

B) 75 Hz

C) 314 Hz

D) 50 Hz

75 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Voltage

C) Heating effect

D) Current

76 / 100

Category: Basic Electricity

76. S.I unit of Power is –

A) Watt-hr

B) Watt

C) Coulomb

D) Joule

77 / 100

Category: AC Fundamental

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

A) 90°

B) 0°

C) 180°

D) 360°

78 / 100

Category: Basic Electricity

78. The total resistance between A and B are?

A) 0 ohm

B) 5 ohm

C) 80 ohm

D) 20 ohm

79 / 100

Category: Basic Electricity

79. The voltage across the short is?

A) Zero

B) Infinity

C) 11.25 V

D) 135 V

80 / 100

Category: AC Machines & Transformer

80. Transformer is a

A) DC Machine

B) Both A & C

C) Static device

D) AC Machine

81 / 100

Category: Magnetic Circuit

81. The principle of electromagnetic induction was propounded by

A) Orsted

B) Edison

C) Flemmings

D) Faraday

82 / 100

Category: Basic Electricity

82. 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 does not depend on the temperature

D) Resistance depends on the temperature

83 / 100

Category: Basic Electricity

83. The energy per unit charge is

A) Voltage

B) Current

C) Power

D) Work

84 / 100

Category: AC Machines & Transformer

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

A) 75%

B) 57.7%

C) 100%

D) 66.7%

85 / 100

Category: DC Machines

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

A) Flemmings Left hand rule

B) Left hand thumb rule

C) Pulm rule

D) Flemmings Right hand rule

86 / 100

Category: AC Fundamental

86. The power factor of an ordinary electric bulb is

A) Slightly more than unity

B) Slightly less than unity

C) Zero

D) Unity

87 / 100

Category: AC Fundamental

87. The length of a phasor represents the amplitude

A) False

B) True

88 / 100

Category: Basic Electricity

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

A) 6 ohm

B) 2 ohm

C) 9 ohm

D) 18 ohm

89 / 100

Category: Basic Electricity

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

A) positive charges

B) electrons

C) electrons & ions

D) Atoms

90 / 100

Category: Magnetic Circuit

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

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

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

C) The piece of metal will lose it magnetism

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

91 / 100

Category: Magnetic Circuit

91. Magnetic lines of forces –

A) are not predictable

B) intersect only in some special circumstances

C) never intersect

D) often intersect

92 / 100

Category: Circuit Theory & Network

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

A) Q

B) Resonant frequency

C) Bandwidth

D) None

93 / 100

Category: AC Fundamental

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

A) 1/2 QV

B) Q^2 / 2C

C) All of the above

D) 1/2 CV^2

94 / 100

Category: AC Fundamental

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

A) 60 Hz

B) 50 Hz

C) 25 Hz

D) None

95 / 100

Category: Basic Electricity

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

A) Reactive power

B) True power

C) Apparent power

D) none of the above

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) all the three will glow

C) The other two lamps will glow

D) Total current in the circuit will increase

97 / 100

Category: Basic Electricity

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

A) Null

B) Infinite

C) The value of the source voltage

D) Zero

98 / 100

Category: Basic Electricity

98. 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

99 / 100

Category: Basic Electricity

99. The reciprocal of resistivity is________

A) Impedance

B) Resistance

C) Conductance

D) Conductivity

100 / 100

Category: Basic Electricity

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

A) False

B) True

Your score is

The average score is 29%

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