SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

1416

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 expression for energy of an inductor

A) ½ LI

B) ½ L^2.I

C) ½ LI^2

D) L/2I

2 / 100

Category: AC Fundamental

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

A) Reluctance and Permeance

B) Conductance, Susceptance

C) Resistance and Reactance

D) Permeance and Susceptance

3 / 100

Category: Basic Electricity

3. The unit of frequency is the hertz

A) True

B) False

4 / 100

Category: Basic Electricity

4. The Inductor doesn’t allow sudden changes in

A) Inductance

B) Current

C) Resistance

D) Voltage

5 / 100

Category: AC Fundamental

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

A) 1/2 CV^2

B) 1/2 QV

C) All of the above

D) Q^2 / 2C

6 / 100

Category: Basic Electricity

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

A) ohm-meter

B) ohm/meter^2

C) ohm-meter^2

D) ohm/meter

7 / 100

Category: AC Machines & Transformer

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

A) 66.7%

B) 57.7%

C) 100%

D) 75%

8 / 100

Category: Basic Electricity

8. 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) 0°

B) None of the above

C) 45°

D) 40°

9 / 100

Category: Basic Electricity

9. 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) Total current in the circuit will increase

D) All the three will glow

10 / 100

Category: AC Fundamental

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

A) 0.04 sec

B) 0.01 sec

C) 0.05 sec

D) 0.06 sec

11 / 100

Category: Basic Electricity

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

A) unity

B) high

C) zero

D) Low

12 / 100

Category: DC Machines

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

A) Lenz’s Law

B) Fleming’s Left-hand Rule

C) Thumb Rule

D) Fleming’s Right-hand Rule

13 / 100

Category: Basic Electricity

13. The capacitor doesn’t allow sudden changes in

A) Capacitance

B) Voltage

C) Resistance

D) Current

14 / 100

Category: AC Fundamental

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

A) Low impedance

B) High Inductance

C) High impedance

D) High capacitance

15 / 100

Category: Magnetic Circuit

15. Magnetic circuit is a closed path followed by –

A) None of these

B) Flux density

C) flux

D) M.M.F

16 / 100

Category: Basic Electricity

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

A) R= ρ. (a/l)

B) R= a/( ρ.l)

C) R= l/( ρ.a)

D) R=ρ. (l/a)

17 / 100

Category: Basic Electricity

17. The energy per unit charge is

A) Power

B) Current

C) Work

D) Voltage

18 / 100

Category: Basic Electricity

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

A) Coulomb, Faraday

B) Faraday, Henry

C) Henry, Coulomb

D) Henry, Faraday

19 / 100

Category: Magnetic Circuit

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

A) Newton

B) Coulomb

C) Lenz

D) Faraday

20 / 100

Category: Basic Electricity

20. Many resistors connected in series will?

A) Divide the current proportionally

B) Reduce the power to zero

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

D) Divide the voltage proportionally among all the resistor

21 / 100

Category: Basic Electricity

21. The reciprocal of resistivity is________

A) Resistance

B) Conductivity

C) Conductance

D) Impedance

22 / 100

Category: Basic Electricity

22. The voltage across the short is?

A) 11.25 V

B) Infinity

C) 135 V

D) Zero

23 / 100

Category: Magnetic Circuit

23. Paramagnetic materials are –

A) Strongly attracted by a magnet

B) strongly repelled by a magnet

C) none

D) slightly attracted by a magnet

24 / 100

Category: Magnetic Circuit

24. The principle of electromagnetic induction was propounded by

A) Flemmings

B) Orsted

C) Edison

D) Faraday

25 / 100

Category: Basic Electricity

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

A) positive charges

B) electrons & ions

C) electrons

D) Atoms

26 / 100

Category: Circuit Theory & Network

26. 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

27 / 100

Category: Basic Electricity

27. 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

28 / 100

Category: Basic Electricity

28. The resistance of straight conductor is independent of-

A) Shape of cross-section

B) Temperature

C) Material

D) Cross-sectional area

29 / 100

Category: Basic Electricity

29. Which is the most cost efficient connection?

A) Either series or parallel

B) Neither series nor parallel

C) Series

D) Parallel

30 / 100

Category: AC Fundamental

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

A) Current

B) Voltage

C) Heating effect

D) Charge transfer

31 / 100

Category: AC Fundamental

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

A) 1.41

B) 1.11

C) 0.707

D) 1

32 / 100

Category: AC Fundamental

32. The frequency of an alternating current is –

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

B) The speed with which the alternator runs

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

D) The number of cycles generated in one minute

33 / 100

Category: AC Fundamental

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

A) Real power

B) Average power

C) all of the above

D) True power

34 / 100

Category: AC Fundamental

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

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

D) Less insulation is required in case of AC

35 / 100

Category: AC Fundamental

35. The power factor of practical inductor is

A) Zero

B) Lagging

C) Leading

D) Unity

36 / 100

Category: DC Machines

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

A) Compound motor

B) Series motor

C) Shunt motor

D) Differential motor

37 / 100

Category: Magnetic Circuit

37. Magnetic lines of forces –

A) intersect only in some special circumstances

B) never intersect

C) are not predictable

D) often intersect

38 / 100

Category: Magnetic Circuit

38. Magnetic lines of forces –

A) Never intersect

B) Intersect only in some special circumstances.

C) Often intersect

D) Are not predictable

39 / 100

Category: Magnetic Circuit

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

A) Flux magnitude

B) Rate of change of flux

C) None

D) Coil resistance

40 / 100

Category: Basic Electricity

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

A) none of the above

B) True power

C) Apparent power

D) Reactive power

41 / 100

Category: Basic Electricity

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

A) True

B) False

42 / 100

Category: Transformer

42. Transformer core are laminated in order to reduce –

A) Core loss

B) Eddy current loss

C) Friction & windage loss

D) Hysteresis loss

43 / 100

Category: Basic Electricity

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

A) Conductors

B) Insulators

C) Dielectrics

D) Semi-conductors

44 / 100

Category: Basic Electricity

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

A) 120 cycles

B) 1/100 cycle

C) 1,200 cycles

D) 12 cycles

45 / 100

Category: Magnetic Circuit

45. Magnetic field has -

A) only magnitude

B) none

C) both magnitude & direction

D) Only direction

46 / 100

Category: DC Machines

46. 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

47 / 100

Category: Magnetic Circuit

47. 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

48 / 100

Category: Magnetic Circuit

48. The reciprocal of permeability is –

A) MMF

B) Resistivity

C) Conductivity

D) reluctivity

49 / 100

Category: Magnetic Circuit

49. The unit of magnetic flux is –

A) Ampere turns

B) Tesla

C) Weber

D) Henry

50 / 100

Category: Basic Electricity

50. 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) Insufficient data provide

B) The largest one among the three values

C) 0 A

D) 12 A

51 / 100

Category: Basic Electricity

51. Unit of resistivity is

A) Ohm-m

B) Ohm

C) Ohm/m

D) Ohm-m²

52 / 100

Category: Basic Electricity

52. 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

53 / 100

Category: AC Fundamental

53. Reactive power is the product of

A) V, I, cos ø

B) V, I

C) V, I, tan ø

D) V, I, sin ø

54 / 100

Category: Magnetic Circuit

54. 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

55 / 100

Category: Basic Electricity

55. S.I unit of conductance is –

A) Ohm-m

B) Mho-m

C) Ohm

D) Mho

56 / 100

Category: DC Machines

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

A) Thermo-couple

B) Generator

C) Transformer

D) Choke

57 / 100

Category: AC Fundamental

57. The length of a phasor represents the amplitude

A) True

B) False

58 / 100

Category: Magnetic Circuit

58. 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) LI / 2t

C) L / 2It

D) LI^2/ 2t

59 / 100

Category: Circuit Theory & Network

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

A) True component of current

B) none

C) Watt-less component of current

D) Active component of current

60 / 100

Category: Basic Electricity

60. Voltage across the 60 ohm resistor is______

A) 120 V

B) 72 V

C) 48 V

D) 0 V

61 / 100

Category: AC Fundamental

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

A) 141 A

B) 282.8 A

C) 150 A

D) 70.7 A

62 / 100

Category: AC Fundamental

62. The power factor of an ordinary electric bulb is

A) Slightly less than unity

B) Zero

C) Slightly more than unity

D) Unity

63 / 100

Category: Magnetic Circuit

63. Magnetic field strength is

A) None of these

B) N.ø/I

C) N.i / L

D) N.i

64 / 100

Category: Basic Electricity

64. 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

65 / 100

Category: Basic Electricity

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

A) False

B) True

66 / 100

Category: AC Fundamental

66. 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

67 / 100

Category: Basic Electricity

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

A) Infinite

B) Null

C) Zero

D) The value of the source voltage

68 / 100

Category: Basic Electricity

68. S.I unit of Power is –

A) Watt-hr

B) Joule

C) Watt

D) Coulomb

69 / 100

Category: Magnetic Circuit

69. Which of the following is unit less?

A) Magnetic susceptibility

B) Permeability

C) Permittivity

D) Moment of Magnet

70 / 100

Category: Basic Electricity

70. Resistance of any circuit depends on –

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

B) Directly proportionate with length and cross sectional area

C) Inversely proportionate with length and cross sectional area

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

71 / 100

Category: Basic Electricity

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

A) Q + v

B) Qv

C) Q/v

D) Q-v

72 / 100

Category: Basic Electricity

72. The voltage across the open circuit is?

A) 100 V

B) 90 V

C) Infinity

D) 0 V

73 / 100

Category: Basic Electricity

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

A) Electrode

B) Capacitive medium

C) Dielectric

D) Conducting medium

74 / 100

Category: Magnetic Circuit

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

A) Capacitance

B) None

C) Self-inductance

D) Mutual inductance

75 / 100

Category: AC Fundamental

75. Unit of impedance is

A) Farad

B) Mho

C) Henry

D) Ohm

76 / 100

Category: DC Machines

76. 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

77 / 100

Category: Magnetic Circuit

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

A) Oersted

B) WB/m²

C) Tesla

D) Both A & B

78 / 100

Category: AC Machines & Transformer

78. Transformer is a

A) Static device

B) Both A & C

C) AC Machine

D) DC Machine

79 / 100

Category: Basic Electricity

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

A) 6 ohm

B) 18 ohm

C) 2 ohm

D) 9 ohm

80 / 100

Category: Magnetic Circuit

80. Magnetic field is proportional to the –

A) direction of electric charges

B) Speed of electric charges

C) Quality of electric charges

D) all of these

81 / 100

Category: AC Fundamental

81. 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 of current is greater than average value

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

82 / 100

Category: AC Fundamental

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

A) 50 Hz

B) None

C) 60 Hz

D) 25 Hz

83 / 100

Category: AC Fundamental

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

A) None of these

B) 0 and 1

C) 0 and -1

D) -1 and 1

84 / 100

Category: Basic Electricity

84. 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. (a/l)

D) R=ρ. (l/a)

85 / 100

Category: Basic Electricity

85. The total resistance between A and B are?

A) 80 ohm

B) 5 ohm

C) 20 ohm

D) 0 ohm

86 / 100

Category: Basic Electricity

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

A) 7.07 A

B) 100 A

C) 70.72 A

D) 707.2 A

87 / 100

Category: Magnetic Circuit

87. S.I unit of Reluctance-

A) AT/m

B) AT/Wb

C) N/Wb

D) AT

88 / 100

Category: Basic Electricity

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

A) Resistance depends on the temperature

B) Resistivity depend on the length

C) Resistivity depend on area of cross section

D) Resistance does not depend on the temperature

89 / 100

Category: Circuit Theory & Network

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

A) Bandwidth

B) Q

C) Resonant frequency

D) None

90 / 100

Category: Basic Electricity

90. What is the resistivity of Copper?

A) 7.3×10^-8 ohm-m

B) 1.59×10^-8 ohm-m

C) 2.7×10^-8 ohm-m

D) 5.35×10^-8 ohm-m

91 / 100

Category: Basic Electricity

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

A) 75 ohm

B) 55 ohm

C) 25 ohm

D) 15 ohm

92 / 100

Category: Basic Electricity

92. 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

93 / 100

Category: Basic Electricity

93. 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 directly proportional to an area of cross section of the wire

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

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

94 / 100

Category: AC Fundamental

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

A) Current

B) Heating effect

C) Charge transfers

D) Voltage

95 / 100

Category: AC Fundamental

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

A) Voltage

B) Current

C) Heating effect

D) Charge transfers

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) The other two lamps will glow

B) no bulb will glow

C) Total current in the circuit will increase

D) all the three will glow

97 / 100

Category: AC Fundamental

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

A) 0°

B) 360°

C) 180°

D) 90°

98 / 100

Category: Basic Electricity

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

A) Proportional to the value of the resistors

B) Equal in all branches

C) Proportional to the power in the circuit

D) The amount of time the circuit

99 / 100

Category: AC Fundamental

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

A) 50 Hz

B) 100 Hz

C) 314 Hz

D) 75 Hz

100 / 100

Category: Magnetic Circuit

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

A) The piece of metal will lose it magnetism

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

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

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

Your score is

The average score is 29%

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