SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

1361

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: DC Machines

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

A) Thermo-couple

B) Choke

C) Generator

D) Transformer

2 / 100

Category: DC Machines

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

A) Series motor

B) Compound motor

C) Shunt motor

D) Differential motor

3 / 100

Category: Basic Electricity

3. S.I unit of Power is –

A) Watt

B) Joule

C) Coulomb

D) Watt-hr

4 / 100

Category: Magnetic Circuit

4. Which of the following is unit less?

A) Permeability

B) Permittivity

C) Moment of Magnet

D) Magnetic susceptibility

5 / 100

Category: AC Fundamental

5. Reactive power is the product of

A) V, I, sin ø

B) V, I

C) V, I, cos ø

D) V, I, tan ø

6 / 100

Category: Magnetic Circuit

6. 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) L / 2It

C) LI / 2t

D) LI^2/ 2t

7 / 100

Category: Basic Electricity

7. 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) Reactive power

D) Apparent power

8 / 100

Category: Basic Electricity

8. What is the resistivity of Copper?

A) 1.59×10^-8 ohm-m

B) 2.7×10^-8 ohm-m

C) 7.3×10^-8 ohm-m

D) 5.35×10^-8 ohm-m

9 / 100

Category: DC Machines

9. 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

10 / 100

Category: AC Fundamental

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

A) Q^2 / 2C

B) 1/2 QV

C) All of the above

D) 1/2 CV^2

11 / 100

Category: Basic Electricity

11. 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

12 / 100

Category: Basic Electricity

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

A) Atoms

B) positive charges

C) electrons

D) electrons & ions

13 / 100

Category: Basic Electricity

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

A) It becomes double its original value

B) It becomes zero

C) It becomes infinity

D) It becomes half its original value

14 / 100

Category: AC Fundamental

14. 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

15 / 100

Category: Basic Electricity

15. Which is the most cost efficient connection?

A) Parallel

B) Either series or parallel

C) Series

D) Neither series nor parallel

16 / 100

Category: Basic Electricity

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

A) 6.37 V

B) 50.96 V

C) 25.48 V

D) 14.14 V

17 / 100

Category: Basic Electricity

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

A) 707.2 A

B) 70.72 A

C) 7.07 A

D) 100 A

18 / 100

Category: Magnetic Circuit

18. Magnetic lines of forces –

A) often intersect

B) are not predictable

C) intersect only in some special circumstances

D) never intersect

19 / 100

Category: Transformer

19. Transformer core are laminated in order to reduce –

A) Hysteresis loss

B) Eddy current loss

C) Core loss

D) Friction & windage loss

20 / 100

Category: Basic Electricity

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

A) False

B) True

21 / 100

Category: Basic Electricity

21. S.I unit of conductance is –

A) Mho

B) Ohm

C) Mho-m

D) Ohm-m

22 / 100

Category: Basic Electricity

22. 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

23 / 100

Category: AC Fundamental

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

A) 360°

B) 180°

C) 90°

D) 0°

24 / 100

Category: Basic Electricity

24. Voltage across the 60 ohm resistor is______

A) 48 V

B) 72 V

C) 120 V

D) 0 V

25 / 100

Category: Basic Electricity

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

A) unity

B) Low

C) high

D) zero

26 / 100

Category: AC Fundamental

26. Unit of impedance is

A) Ohm

B) Mho

C) Farad

D) Henry

27 / 100

Category: Magnetic Circuit

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

A) Flux magnitude

B) None

C) Rate of change of flux

D) Coil resistance

28 / 100

Category: Basic Electricity

28. 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) Proportional to the value of the resistors

D) The amount of time the circuit

29 / 100

Category: AC Fundamental

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

A) Heating effect

B) Current

C) Voltage

D) Charge transfer

30 / 100

Category: Basic Electricity

30. 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

31 / 100

Category: Magnetic Circuit

31. 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

32 / 100

Category: Basic Electricity

32. The Inductor doesn’t allow sudden changes in

A) Current

B) Inductance

C) Resistance

D) Voltage

33 / 100

Category: Magnetic Circuit

33. S.I unit of Reluctance-

A) AT/m

B) AT/Wb

C) N/Wb

D) AT

34 / 100

Category: Magnetic Circuit

34. Magnetic field strength is

A) N.ø/I

B) N.i

C) None of these

D) N.i / L

35 / 100

Category: Magnetic Circuit

35. The principle of electromagnetic induction was propounded by

A) Flemmings

B) Edison

C) Orsted

D) Faraday

36 / 100

Category: AC Fundamental

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

C) None

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

37 / 100

Category: Basic Electricity

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

A) Conducting medium

B) Dielectric

C) Electrode

D) Capacitive medium

38 / 100

Category: Magnetic Circuit

38. The reciprocal of permeability is –

A) Resistivity

B) reluctivity

C) Conductivity

D) MMF

39 / 100

Category: Magnetic Circuit

39. 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 single pole magnets, each of the magnets only having north poles

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

40 / 100

Category: Magnetic Circuit

40. 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 Right Hand Rule

C) Fleming's Left Hand Rule

D) Faraday's Left Hand Rule

41 / 100

Category: Magnetic Circuit

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

A) number of turns in the circuit

B) Magnitude of current

C) either b or c

D) Reluctance

42 / 100

Category: Basic Electricity

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

A) Semi-conductors

B) Conductors

C) Insulators

D) Dielectrics

43 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Heating effect

C) Current

D) Voltage

44 / 100

Category: Basic Electricity

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

A) 1,200 cycles

B) 1/100 cycle

C) 12 cycles

D) 120 cycles

45 / 100

Category: Basic Electricity

45. 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

46 / 100

Category: Basic Electricity

46. 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

47 / 100

Category: Magnetic Circuit

47. Magnetic circuit is a closed path followed by –

A) flux

B) None of these

C) Flux density

D) M.M.F

48 / 100

Category: Basic Electricity

48. The energy per unit charge is

A) Current

B) Voltage

C) Power

D) Work

49 / 100

Category: Magnetic Circuit

49. The unit of magnetic flux is –

A) Weber

B) Ampere turns

C) Tesla

D) Henry

50 / 100

Category: Basic Electricity

50. 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

51 / 100

Category: AC Fundamental

51. The power factor of an ordinary electric bulb is

A) Slightly more than unity

B) Slightly less than unity

C) Zero

D) Unity

52 / 100

Category: AC Fundamental

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

A) 150 A

B) 141 A

C) 282.8 A

D) 70.7 A

53 / 100

Category: AC Fundamental

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

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

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) Transformation of voltage is possible in case of AC only

54 / 100

Category: Magnetic Circuit

54. 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) Self-inductance

C) None

D) Capacitance

55 / 100

Category: Basic Electricity

55. Unit of resistivity is

A) Ohm

B) Ohm/m

C) Ohm-m

D) Ohm-m²

56 / 100

Category: Basic Electricity

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

A) ohm-meter

B) ohm/meter

C) ohm/meter^2

D) ohm-meter^2

57 / 100

Category: Basic Electricity

57. The capacitor doesn’t allow sudden changes in

A) Current

B) Capacitance

C) Resistance

D) Voltage

58 / 100

Category: Basic Electricity

58. The voltage across the short is?

A) 11.25 V

B) 135 V

C) Zero

D) Infinity

59 / 100

Category: Circuit Theory & Network

59. 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

60 / 100

Category: Basic Electricity

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

A) True

B) False

61 / 100

Category: AC Fundamental

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

A) Resistance and Reactance

B) Permeance and Susceptance

C) Reluctance and Permeance

D) Conductance, Susceptance

62 / 100

Category: Basic Electricity

62. The expression for energy of an inductor

A) ½ L^2.I

B) L/2I

C) ½ LI^2

D) ½ LI

63 / 100

Category: Basic Electricity

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

A) Q-v

B) Q + v

C) Qv

D) Q/v

64 / 100

Category: AC Machines & Transformer

64. Transformer is a

A) Both A & C

B) AC Machine

C) Static device

D) DC Machine

65 / 100

Category: AC Machines & Transformer

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

A) 66.7%

B) 57.7%

C) 75%

D) 100%

66 / 100

Category: Basic Electricity

66. The resistance of straight conductor is independent of-

A) Material

B) Shape of cross-section

C) Cross-sectional area

D) Temperature

67 / 100

Category: Basic Electricity

67. The voltage across the open circuit is?

A) 90 V

B) 100 V

C) Infinity

D) 0 V

68 / 100

Category: Basic Electricity

68. The total resistance between A and B are?

A) 0 ohm

B) 20 ohm

C) 80 ohm

D) 5 ohm

69 / 100

Category: AC Fundamental

69. The length of a phasor represents the amplitude

A) False

B) True

70 / 100

Category: AC Fundamental

70. The power factor of practical inductor is

A) Lagging

B) Zero

C) Leading

D) Unity

71 / 100

Category: AC Fundamental

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

A) None

B) 60 Hz

C) 50 Hz

D) 25 Hz

72 / 100

Category: AC Fundamental

72. 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

73 / 100

Category: Magnetic Circuit

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

A) Tesla

B) Oersted

C) WB/m²

D) Both A & B

74 / 100

Category: Basic Electricity

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

A) Zero

B) Infinite

C) The value of the source voltage

D) Null

75 / 100

Category: AC Fundamental

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

A) Current

B) Heating effect

C) Charge transfers

D) Voltage

76 / 100

Category: Magnetic Circuit

76. Magnetic field has -

A) only magnitude

B) both magnitude & direction

C) none

D) Only direction

77 / 100

Category: AC Fundamental

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

A) Low impedance

B) High capacitance

C) High Inductance

D) High impedance

78 / 100

Category: Basic Electricity

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

A) Henry, Coulomb

B) Coulomb, Faraday

C) Faraday, Henry

D) Henry, Faraday

79 / 100

Category: Basic Electricity

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

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

B) Resistance is directly proportional to an area of cross section 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

80 / 100

Category: Basic Electricity

80. 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) 0°

C) None of the above

D) 40°

81 / 100

Category: Circuit Theory & Network

81. 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

82 / 100

Category: Basic Electricity

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

A) R= a/( ρ.l)

B) R=ρ. (l/a)

C) R= ρ. (a/l)

D) R= l/( ρ.a)

83 / 100

Category: AC Fundamental

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

A) Real power

B) all of the above

C) Average power

D) True power

84 / 100

Category: Basic Electricity

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

A) Resistance does not depend on the temperature

B) Resistivity depend on the length

C) Resistivity depend on area of cross section

D) Resistance depends on the temperature

85 / 100

Category: Basic Electricity

85. 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

86 / 100

Category: AC Fundamental

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

A) 50 Hz

B) 100 Hz

C) 314 Hz

D) 75 Hz

87 / 100

Category: Magnetic Circuit

87. Magnetic lines of forces –

A) Intersect only in some special circumstances.

B) Often intersect

C) Never intersect

D) Are not predictable

88 / 100

Category: Basic Electricity

88. The unit of frequency is the hertz

A) False

B) True

89 / 100

Category: AC Fundamental

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

A) 200 V

B) 282.8 V

C) 127.4 V

D) 141.4 V

90 / 100

Category: Basic Electricity

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

A) 55 ohm

B) 15 ohm

C) 75 ohm

D) 25 ohm

91 / 100

Category: Magnetic Circuit

91. Paramagnetic materials are –

A) none

B) Strongly attracted by a magnet

C) slightly attracted by a magnet

D) strongly repelled by a magnet

92 / 100

Category: AC Fundamental

92. The frequency of an alternating current is –

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

B) The number of cycles generated in one minute

C) The speed with which the alternator runs

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

93 / 100

Category: Basic Electricity

93. The reciprocal of resistivity is________

A) Resistance

B) Conductivity

C) Impedance

D) Conductance

94 / 100

Category: AC Fundamental

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

A) 1.41

B) 1.11

C) 0.707

D) 1

95 / 100

Category: Circuit Theory & Network

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

A) Resonant frequency

B) None

C) Bandwidth

D) Q

96 / 100

Category: Magnetic Circuit

96. Magnetic field is proportional to the –

A) Speed of electric charges

B) direction of electric charges

C) Quality of electric charges

D) all of these

97 / 100

Category: Basic Electricity

97. 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)

98 / 100

Category: Basic Electricity

98. 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

99 / 100

Category: DC Machines

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

A) Flemmings Left hand rule

B) Flemmings Right hand rule

C) Palm rule

D) Left hand thumb rule

100 / 100

Category: DC Machines

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

A) Flemmings Right hand rule

B) Flemmings Left hand rule

C) Pulm rule

D) Left hand thumb rule

Your score is

The average score is 29%

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