SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

1417

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. 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) LI^2/ 2t

D) L / 2It

2 / 100

Category: AC Fundamental

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

A) Low impedance

B) High impedance

C) High capacitance

D) High Inductance

3 / 100

Category: Basic Electricity

3. The energy per unit charge is

A) Work

B) Power

C) Voltage

D) Current

4 / 100

Category: Basic Electricity

4. The reciprocal of resistivity is________

A) Conductance

B) Resistance

C) Conductivity

D) Impedance

5 / 100

Category: Magnetic Circuit

5. 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

6 / 100

Category: Magnetic Circuit

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

A) number of turns in the circuit

B) either b or c

C) Reluctance

D) Magnitude of current

7 / 100

Category: Basic Electricity

7. Many resistors connected in series will?

A) Divide the voltage proportionally among all the resistor

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

C) Reduce the power to zero

D) Divide the current proportionally

8 / 100

Category: Circuit Theory & Network

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

A) 0.81

B) 0.111

C) 1.111

D) 1

9 / 100

Category: Magnetic Circuit

9. Paramagnetic materials are –

A) Strongly attracted by a magnet

B) slightly attracted by a magnet

C) strongly repelled by a magnet

D) none

10 / 100

Category: Magnetic Circuit

10. 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

11 / 100

Category: AC Fundamental

11. The length of a phasor represents the amplitude

A) False

B) True

12 / 100

Category: AC Fundamental

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

A) 100 Hz

B) 314 Hz

C) 75 Hz

D) 50 Hz

13 / 100

Category: AC Fundamental

13. The power factor of an ordinary electric bulb is

A) Slightly less than unity

B) Unity

C) Slightly more than unity

D) Zero

14 / 100

Category: Magnetic Circuit

14. 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

15 / 100

Category: DC Machines

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

A) Compound motor

B) Differential motor

C) Shunt motor

D) Series motor

16 / 100

Category: Basic Electricity

16. The voltage across the short is?

A) 135 V

B) Zero

C) Infinity

D) 11.25 V

17 / 100

Category: AC Fundamental

17. Unit of impedance is

A) Farad

B) Henry

C) Mho

D) Ohm

18 / 100

Category: AC Fundamental

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

A) 0.707

B) 1.11

C) 1

D) 1.41

19 / 100

Category: Magnetic Circuit

19. The reciprocal of permeability is –

A) Conductivity

B) Resistivity

C) MMF

D) reluctivity

20 / 100

Category: Magnetic Circuit

20. The principle of electromagnetic induction was propounded by

A) Orsted

B) Faraday

C) Flemmings

D) Edison

21 / 100

Category: Basic Electricity

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

A) It becomes half its original value

B) It becomes double its original value

C) It becomes infinity

D) It becomes zero

22 / 100

Category: Basic Electricity

22. 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)

23 / 100

Category: Magnetic Circuit

23. Magnetic field strength is

A) N.i / L

B) N.i

C) N.ø/I

D) None of these

24 / 100

Category: Basic Electricity

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

A) Capacitive medium

B) Conducting medium

C) Electrode

D) Dielectric

25 / 100

Category: Basic Electricity

25. 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

26 / 100

Category: Basic Electricity

26. S.I unit of conductance is –

A) Mho-m

B) Mho

C) Ohm-m

D) Ohm

27 / 100

Category: Basic Electricity

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

A) 75 ohm

B) 25 ohm

C) 15 ohm

D) 55 ohm

28 / 100

Category: Basic Electricity

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

A) 707.2 A

B) 100 A

C) 70.72 A

D) 7.07 A

29 / 100

Category: AC Fundamental

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

A) 360°

B) 180°

C) 90°

D) 0°

30 / 100

Category: AC Fundamental

30. 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 is equal to average value

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

D) None

31 / 100

Category: Basic Electricity

31. The resistance of straight conductor is independent of-

A) Shape of cross-section

B) Material

C) Temperature

D) Cross-sectional area

32 / 100

Category: AC Fundamental

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

A) 200 V

B) 282.8 V

C) 141.4 V

D) 127.4 V

33 / 100

Category: DC Machines

33. 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

34 / 100

Category: Magnetic Circuit

34. Magnetic field is proportional to the –

A) Speed of electric charges

B) Quality of electric charges

C) direction of electric charges

D) all of these

35 / 100

Category: Basic Electricity

35. The Inductor doesn’t allow sudden changes in

A) Current

B) Resistance

C) Voltage

D) Inductance

36 / 100

Category: Basic Electricity

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

A) Semi-conductors

B) Insulators

C) Conductors

D) Dielectrics

37 / 100

Category: Basic Electricity

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

A) positive charges

B) electrons

C) electrons & ions

D) Atoms

38 / 100

Category: Magnetic Circuit

38. Magnetic circuit is a closed path followed by –

A) None of these

B) M.M.F

C) flux

D) Flux density

39 / 100

Category: Basic Electricity

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

A) False

B) True

40 / 100

Category: Basic Electricity

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

A) 12 cycles

B) 1,200 cycles

C) 1/100 cycle

D) 120 cycles

41 / 100

Category: AC Fundamental

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

A) 1/2 QV

B) All of the above

C) 1/2 CV^2

D) Q^2 / 2C

42 / 100

Category: Magnetic Circuit

42. 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) Faraday's Left Hand Rule

C) Fleming's Right Hand Rule

D) Fleming's Left Hand Rule

43 / 100

Category: AC Fundamental

43. 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

44 / 100

Category: Basic Electricity

44. 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) Resistance depends on the temperature

D) Resistivity depend on area of cross section

45 / 100

Category: Basic Electricity

45. Which is the most cost efficient connection?

A) Either series or parallel

B) Series

C) Parallel

D) Neither series nor parallel

46 / 100

Category: Basic Electricity

46. 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. (l/a)

D) R= ρ. (a/l)

47 / 100

Category: Basic Electricity

47. What is the resistivity of Copper?

A) 7.3×10^-8 ohm-m

B) 2.7×10^-8 ohm-m

C) 5.35×10^-8 ohm-m

D) 1.59×10^-8 ohm-m

48 / 100

Category: Basic Electricity

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

A) high

B) unity

C) zero

D) Low

49 / 100

Category: Basic Electricity

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

A) Zero

B) The value of the source voltage

C) Null

D) Infinite

50 / 100

Category: AC Fundamental

50. The power factor of practical inductor is

A) Leading

B) Zero

C) Lagging

D) Unity

51 / 100

Category: Magnetic Circuit

51. Magnetic lines of forces –

A) Intersect only in some special circumstances.

B) Often intersect

C) Never intersect

D) Are not predictable

52 / 100

Category: Magnetic Circuit

52. S.I unit of Reluctance-

A) AT/Wb

B) AT

C) AT/m

D) N/Wb

53 / 100

Category: AC Fundamental

53. 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

54 / 100

Category: Basic Electricity

54. The unit of frequency is the hertz

A) True

B) False

55 / 100

Category: Magnetic Circuit

55. Which of the following is unit less?

A) Magnetic susceptibility

B) Permittivity

C) Moment of Magnet

D) Permeability

56 / 100

Category: Basic Electricity

56. 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

57 / 100

Category: AC Machines & Transformer

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

A) 100%

B) 57.7%

C) 66.7%

D) 75%

58 / 100

Category: Basic Electricity

58. 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

59 / 100

Category: Basic Electricity

59. 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

60 / 100

Category: AC Fundamental

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

A) 60 Hz

B) 50 Hz

C) 25 Hz

D) None

61 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Voltage

C) Current

D) Heating effect

62 / 100

Category: AC Fundamental

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

A) Current

B) Charge transfer

C) Heating effect

D) Voltage

63 / 100

Category: Basic Electricity

63. 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

64 / 100

Category: DC Machines

64. 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

65 / 100

Category: AC Fundamental

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

A) Resistance and Reactance

B) Conductance, Susceptance

C) Reluctance and Permeance

D) Permeance and Susceptance

66 / 100

Category: DC Machines

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

A) Flemmings Right hand rule

B) Flemmings Left hand rule

C) Left hand thumb rule

D) Palm rule

67 / 100

Category: DC Machines

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

A) Transformer

B) Thermo-couple

C) Choke

D) Generator

68 / 100

Category: Basic Electricity

68. The total resistance between A and B are?

A) 0 ohm

B) 80 ohm

C) 5 ohm

D) 20 ohm

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) True

B) False

70 / 100

Category: Basic Electricity

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

A) Q/v

B) Qv

C) Q-v

D) Q + v

71 / 100

Category: AC Fundamental

71. Reactive power is the product of

A) V, I, cos ø

B) V, I, sin ø

C) V, I, tan ø

D) V, I

72 / 100

Category: Basic Electricity

72. The voltage across the open circuit is?

A) 100 V

B) Infinity

C) 90 V

D) 0 V

73 / 100

Category: Basic Electricity

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

A) 25.48 V

B) 14.14 V

C) 6.37 V

D) 50.96 V

74 / 100

Category: Transformer

74. Transformer core are laminated in order to reduce –

A) Core loss

B) Hysteresis loss

C) Eddy current loss

D) Friction & windage loss

75 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Current

C) Heating effect

D) Voltage

76 / 100

Category: Magnetic Circuit

76. Magnetic lines of forces –

A) intersect only in some special circumstances

B) often intersect

C) never intersect

D) are not predictable

77 / 100

Category: Basic Electricity

77. The expression for energy of an inductor

A) ½ L^2.I

B) L/2I

C) ½ LI

D) ½ LI^2

78 / 100

Category: Magnetic Circuit

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

A) Flux magnitude

B) None

C) Rate of change of flux

D) Coil resistance

79 / 100

Category: Basic Electricity

79. 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) Total current in the circuit will increase

D) No bulb will glow

80 / 100

Category: Basic Electricity

80. Unit of resistivity is

A) Ohm

B) Ohm-m

C) Ohm/m

D) Ohm-m²

81 / 100

Category: Basic Electricity

81. 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

82 / 100

Category: AC Fundamental

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

A) 0.05 sec

B) 0.04 sec

C) 0.06 sec

D) 0.01 sec

83 / 100

Category: AC Machines & Transformer

83. Transformer is a

A) Static device

B) AC Machine

C) DC Machine

D) Both A & C

84 / 100

Category: AC Fundamental

84. The frequency of an alternating current is –

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

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

C) The speed with which the alternator runs

D) The number of cycles generated in one minute

85 / 100

Category: Magnetic Circuit

85. The unit of magnetic flux is –

A) Tesla

B) Henry

C) Weber

D) Ampere turns

86 / 100

Category: AC Fundamental

86. 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) 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) Less insulation is required in case of AC

87 / 100

Category: Basic Electricity

87. Voltage across the 60 ohm resistor is______

A) 48 V

B) 120 V

C) 72 V

D) 0 V

88 / 100

Category: Basic Electricity

88. 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) Insufficient data provide

C) 0 A

D) 12 A

89 / 100

Category: Magnetic Circuit

89. Magnetic field has -

A) only magnitude

B) none

C) Only direction

D) both magnitude & direction

90 / 100

Category: Circuit Theory & Network

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

A) Bandwidth

B) Q

C) Resonant frequency

D) None

91 / 100

Category: Circuit Theory & Network

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

A) Active component of current

B) True component of current

C) Watt-less component of current

D) none

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) None of the above

B) 40°

C) 45°

D) 0°

93 / 100

Category: Basic Electricity

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

A) ohm-meter

B) ohm/meter^2

C) ohm/meter

D) ohm-meter^2

94 / 100

Category: Magnetic Circuit

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

A) Oersted

B) Tesla

C) Both A & B

D) WB/m²

95 / 100

Category: Basic Electricity

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

A) Henry, Coulomb

B) Henry, Faraday

C) Coulomb, Faraday

D) Faraday, Henry

96 / 100

Category: Basic Electricity

96. The capacitor doesn’t allow sudden changes in

A) Resistance

B) Current

C) Capacitance

D) Voltage

97 / 100

Category: Basic Electricity

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

A) False

B) True

98 / 100

Category: Basic Electricity

98. S.I unit of Power is –

A) Coulomb

B) Watt-hr

C) Joule

D) Watt

99 / 100

Category: Basic Electricity

99. 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) Reactive power

D) True power

100 / 100

Category: AC Fundamental

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

A) Average power

B) True power

C) all of the above

D) Real power

Your score is

The average score is 29%

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