SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

987

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. Magnetic field has -

A) both magnitude & direction

B) none

C) Only direction

D) only magnitude

2 / 100

Category: Basic Electricity

2. The unit of frequency is the hertz

A) True

B) False

3 / 100

Category: DC Machines

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

A) Flemmings Right hand rule

B) Palm rule

C) Left hand thumb rule

D) Flemmings Left hand rule

4 / 100

Category: Magnetic Circuit

4. The reciprocal of permeability is –

A) MMF

B) Conductivity

C) Resistivity

D) reluctivity

5 / 100

Category: Basic Electricity

5. 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) Directly proportionate with length and inversely proportionate with cross sectional area

D) Inversely proportionate with length and cross sectional area

6 / 100

Category: Basic Electricity

6. Unit of resistivity is

A) Ohm-m

B) Ohm

C) Ohm/m

D) Ohm-m²

7 / 100

Category: Circuit Theory & Network

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

A) 0.81

B) 1.111

C) 1

D) 0.111

8 / 100

Category: Basic Electricity

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

A) Q + v

B) Qv

C) Q-v

D) Q/v

9 / 100

Category: AC Fundamental

9. 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 cycles generated in one minute

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

10 / 100

Category: Basic Electricity

10. 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)

11 / 100

Category: Basic Electricity

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

A) 18 ohm

B) 9 ohm

C) 6 ohm

D) 2 ohm

12 / 100

Category: Basic Electricity

12. The resistance of straight conductor is independent of-

A) Material

B) Shape of cross-section

C) Cross-sectional area

D) Temperature

13 / 100

Category: Basic Electricity

13. 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

14 / 100

Category: AC Fundamental

14. The length of a phasor represents the amplitude

A) True

B) False

15 / 100

Category: AC Fundamental

15. The power factor of an ordinary electric bulb is

A) Slightly more than unity

B) Unity

C) Zero

D) Slightly less than unity

16 / 100

Category: Basic Electricity

16. Voltage across the 60 ohm resistor is______

A) 72 V

B) 120 V

C) 0 V

D) 48 V

17 / 100

Category: Magnetic Circuit

17. The unit of magnetic flux is –

A) Weber

B) Henry

C) Tesla

D) Ampere turns

18 / 100

Category: Magnetic Circuit

18. 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) LI^2/ 2t

C) L / 2I^2 t

D) L / 2It

19 / 100

Category: AC Fundamental

19. The power factor of practical inductor is

A) Zero

B) Leading

C) Lagging

D) Unity

20 / 100

Category: AC Fundamental

20. 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

21 / 100

Category: DC Machines

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

A) Differential motor

B) Compound motor

C) Series motor

D) Shunt motor

22 / 100

Category: DC Machines

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

A) Thumb Rule

B) Fleming’s Left-hand Rule

C) Fleming’s Right-hand Rule

D) Lenz’s Law

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 Right Hand Rule

B) Fleming's Left Hand Rule

C) Faraday's Right Hand Rule

D) Faraday's Left Hand Rule

24 / 100

Category: AC Fundamental

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

A) Average power

B) True power

C) Real power

D) all of the above

25 / 100

Category: AC Fundamental

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

A) Voltage

B) Heating effect

C) Charge transfer

D) Current

26 / 100

Category: Basic Electricity

26. The energy per unit charge is

A) Power

B) Current

C) Work

D) Voltage

27 / 100

Category: Basic Electricity

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

A) Resistance depends on the temperature

B) Resistivity depend on area of cross section

C) Resistance does not depend on the temperature

D) Resistivity depend on the length

28 / 100

Category: AC Fundamental

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

A) 180°

B) 360°

C) 90°

D) 0°

29 / 100

Category: DC Machines

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

A) Choke

B) Generator

C) Transformer

D) Thermo-couple

30 / 100

Category: Magnetic Circuit

30. The principle of electromagnetic induction was propounded by

A) Edison

B) Orsted

C) Flemmings

D) Faraday

31 / 100

Category: Basic Electricity

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

A) ohm/meter^2

B) ohm-meter

C) ohm-meter^2

D) ohm/meter

32 / 100

Category: DC Machines

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

A) Pulm rule

B) Left hand thumb rule

C) Flemmings Right hand rule

D) Flemmings Left hand rule

33 / 100

Category: Magnetic Circuit

33. Magnetic lines of forces –

A) are not predictable

B) intersect only in some special circumstances

C) often intersect

D) never intersect

34 / 100

Category: Basic Electricity

34. The expression for energy of an inductor

A) ½ L^2.I

B) ½ LI

C) ½ LI^2

D) L/2I

35 / 100

Category: Basic Electricity

35. 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) None of the above

C) 45°

D) 0°

36 / 100

Category: Basic Electricity

36. Which is the most cost efficient connection?

A) Parallel

B) Either series or parallel

C) Series

D) Neither series nor parallel

37 / 100

Category: Basic Electricity

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

A) Proportional to the power in the circuit

B) Equal in all branches

C) The amount of time the circuit

D) Proportional to the value of the resistors

38 / 100

Category: Basic Electricity

38. S.I unit of Power is –

A) Joule

B) Coulomb

C) Watt

D) Watt-hr

39 / 100

Category: AC Fundamental

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

A) Heating effect

B) Charge transfers

C) Voltage

D) Current

40 / 100

Category: Basic Electricity

40. The reciprocal of resistivity is________

A) Conductance

B) Conductivity

C) Resistance

D) Impedance

41 / 100

Category: Transformer

41. Transformer core are laminated in order to reduce –

A) Hysteresis loss

B) Core loss

C) Friction & windage loss

D) Eddy current loss

42 / 100

Category: Basic Electricity

42. The total resistance between A and B are?

A) 0 ohm

B) 80 ohm

C) 20 ohm

D) 5 ohm

43 / 100

Category: Magnetic Circuit

43. S.I unit of Reluctance-

A) AT

B) N/Wb

C) AT/m

D) AT/Wb

44 / 100

Category: Basic Electricity

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

A) Henry, Coulomb

B) Faraday, Henry

C) Coulomb, Faraday

D) Henry, Faraday

45 / 100

Category: Basic Electricity

45. The voltage across the open circuit is?

A) Infinity

B) 0 V

C) 100 V

D) 90 V

46 / 100

Category: AC Machines & Transformer

46. Transformer is a

A) Both A & C

B) AC Machine

C) Static device

D) DC Machine

47 / 100

Category: Basic Electricity

47. 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) The other two lamps will glow

D) no bulb will glow

48 / 100

Category: AC Fundamental

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

A) Current

B) Charge transfers

C) Heating effect

D) Voltage

49 / 100

Category: Basic Electricity

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

A) 7.07 A

B) 707.2 A

C) 100 A

D) 70.72 A

50 / 100

Category: Basic Electricity

50. The Inductor doesn’t allow sudden changes in

A) Current

B) Resistance

C) Inductance

D) Voltage

51 / 100

Category: Magnetic Circuit

51. Which of the following is unit less?

A) Permeability

B) Moment of Magnet

C) Magnetic susceptibility

D) Permittivity

52 / 100

Category: Basic Electricity

52. The voltage across the short is?

A) Infinity

B) Zero

C) 135 V

D) 11.25 V

53 / 100

Category: Basic Electricity

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

A) 55 ohm

B) 25 ohm

C) 15 ohm

D) 75 ohm

54 / 100

Category: Basic Electricity

54. 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 directly proportional to a length of the wire

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

55 / 100

Category: Basic Electricity

55. What is the resistivity of Copper?

A) 5.35×10^-8 ohm-m

B) 1.59×10^-8 ohm-m

C) 2.7×10^-8 ohm-m

D) 7.3×10^-8 ohm-m

56 / 100

Category: Basic Electricity

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

A) It becomes half its original value

B) It becomes zero

C) It becomes infinity

D) It becomes double its original value

57 / 100

Category: Magnetic Circuit

57. Magnetic lines of forces –

A) Are not predictable

B) Intersect only in some special circumstances.

C) Never intersect

D) Often intersect

58 / 100

Category: Basic Electricity

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

A) none of the above

B) Apparent power

C) True power

D) Reactive power

59 / 100

Category: Magnetic Circuit

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

A) Reluctance

B) either b or c

C) number of turns in the circuit

D) Magnitude of current

60 / 100

Category: Basic Electricity

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

A) False

B) True

61 / 100

Category: AC Fundamental

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

A) 60 Hz

B) 25 Hz

C) None

D) 50 Hz

62 / 100

Category: Magnetic Circuit

62. 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) None

C) Mutual inductance

D) Capacitance

63 / 100

Category: Basic Electricity

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

A) electrons & ions

B) positive charges

C) Atoms

D) electrons

64 / 100

Category: Basic Electricity

64. S.I unit of conductance is –

A) Ohm-m

B) Mho-m

C) Ohm

D) Mho

65 / 100

Category: Basic Electricity

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

A) R=ρ. (l/a)

B) R= ρ. (a/l)

C) R= l/( ρ.a)

D) R= a/( ρ.l)

66 / 100

Category: Circuit Theory & Network

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

A) Active component of current

B) none

C) True component of current

D) Watt-less component of current

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

A) 120 cycles

B) 1/100 cycle

C) 12 cycles

D) 1,200 cycles

69 / 100

Category: Magnetic Circuit

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

A) Both A & B

B) WB/m²

C) Oersted

D) Tesla

70 / 100

Category: Basic Electricity

70. 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) The other two lamps will glow

C) no bulb will glow

D) all the three will glow

71 / 100

Category: AC Fundamental

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

A) None

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

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

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

72 / 100

Category: AC Fundamental

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

A) Reluctance and Permeance

B) Resistance and Reactance

C) Conductance, Susceptance

D) Permeance and Susceptance

73 / 100

Category: Magnetic Circuit

73. 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, each of the magnets only having north poles

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

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

74 / 100

Category: AC Fundamental

74. 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

75 / 100

Category: AC Fundamental

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

A) Less insulation is required in case of AC

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

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

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

76 / 100

Category: AC Fundamental

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

A) Q^2 / 2C

B) 1/2 CV^2

C) 1/2 QV

D) All of the above

77 / 100

Category: Basic Electricity

77. 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) The largest one among the three values

B) 0 A

C) Insufficient data provide

D) 12 A

78 / 100

Category: Magnetic Circuit

78. Magnetic field strength is

A) N.i

B) None of these

C) N.ø/I

D) N.i / L

79 / 100

Category: Basic Electricity

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

A) Capacitive medium

B) Electrode

C) Dielectric

D) Conducting medium

80 / 100

Category: AC Fundamental

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

A) High impedance

B) Low impedance

C) High capacitance

D) High Inductance

81 / 100

Category: Circuit Theory & Network

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

A) Q

B) None

C) Bandwidth

D) Resonant frequency

82 / 100

Category: Basic Electricity

82. 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

83 / 100

Category: AC Fundamental

83. Unit of impedance is

A) Farad

B) Mho

C) Henry

D) Ohm

84 / 100

Category: Basic Electricity

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

A) Conductors

B) Insulators

C) Dielectrics

D) Semi-conductors

85 / 100

Category: AC Fundamental

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

A) 1.11

B) 1

C) 1.41

D) 0.707

86 / 100

Category: Basic Electricity

86. Many resistors connected in series will?

A) Reduce the power to zero

B) Divide the voltage proportionally among all the resistor

C) Divide the current proportionally

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

87 / 100

Category: Magnetic Circuit

87. Magnetic circuit is a closed path followed by –

A) flux

B) Flux density

C) None of these

D) M.M.F

88 / 100

Category: Magnetic Circuit

88. 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

89 / 100

Category: Basic Electricity

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

A) 6.37 V

B) 25.48 V

C) 14.14 V

D) 50.96 V

90 / 100

Category: Magnetic Circuit

90. 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

91 / 100

Category: Magnetic Circuit

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

A) Flux magnitude

B) Rate of change of flux

C) Coil resistance

D) None

92 / 100

Category: AC Fundamental

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

A) 282.8 V

B) 127.4 V

C) 141.4 V

D) 200 V

93 / 100

Category: AC Fundamental

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

A) 0.06 sec

B) 0.04 sec

C) 0.01 sec

D) 0.05 sec

94 / 100

Category: AC Fundamental

94. Reactive power is the product of

A) V, I, cos ø

B) V, I, sin ø

C) V, I

D) V, I, tan ø

95 / 100

Category: AC Machines & Transformer

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

A) 100%

B) 75%

C) 57.7%

D) 66.7%

96 / 100

Category: Basic Electricity

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

A) False

B) True

97 / 100

Category: Basic Electricity

97. The capacitor doesn’t allow sudden changes in

A) Capacitance

B) Current

C) Resistance

D) Voltage

98 / 100

Category: AC Fundamental

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

A) 50 Hz

B) 75 Hz

C) 314 Hz

D) 100 Hz

99 / 100

Category: Magnetic Circuit

99. Paramagnetic materials are –

A) Strongly attracted by a magnet

B) strongly repelled by a magnet

C) slightly attracted by a magnet

D) none

100 / 100

Category: Basic Electricity

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

A) high

B) Low

C) zero

D) unity

Your score is

The average score is 29%

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