SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

1319

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: AC Fundamental

1. 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

2 / 100

Category: Magnetic Circuit

2. Magnetic field has -

A) none

B) only magnitude

C) Only direction

D) both magnitude & direction

3 / 100

Category: Basic Electricity

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

A) Infinite

B) Zero

C) Null

D) The value of the source voltage

4 / 100

Category: Basic Electricity

4. 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

5 / 100

Category: AC Fundamental

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

A) Voltage

B) Heating effect

C) Current

D) Charge transfers

6 / 100

Category: Magnetic Circuit

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

A) Lenz

B) Faraday

C) Newton

D) Coulomb

7 / 100

Category: AC Fundamental

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

A) all of the above

B) True power

C) Real power

D) Average power

8 / 100

Category: Magnetic Circuit

8. 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) Mutual inductance

C) None

D) Self-inductance

9 / 100

Category: Basic Electricity

9. 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= a/( ρ.l)

D) R= l/( ρ.a)

10 / 100

Category: Basic Electricity

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

A) It becomes double its original value

B) It becomes infinity

C) It becomes half its original value

D) It becomes zero

11 / 100

Category: AC Fundamental

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

A) High impedance

B) High Inductance

C) High capacitance

D) Low impedance

12 / 100

Category: Basic Electricity

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

A) 2 ohm

B) 6 ohm

C) 9 ohm

D) 18 ohm

13 / 100

Category: Basic Electricity

13. Many resistors connected in series will?

A) Reduce the power to zero

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

C) Divide the voltage proportionally among all the resistor

D) Divide the current proportionally

14 / 100

Category: AC Fundamental

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

A) 70.7 A

B) 150 A

C) 282.8 A

D) 141 A

15 / 100

Category: AC Fundamental

15. 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

16 / 100

Category: AC Fundamental

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

A) 50 Hz

B) 25 Hz

C) 60 Hz

D) None

17 / 100

Category: Magnetic Circuit

17. Magnetic field strength is

A) N.ø/I

B) N.i / L

C) N.i

D) None of these

18 / 100

Category: AC Fundamental

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

A) 1.11

B) 1.41

C) 0.707

D) 1

19 / 100

Category: Circuit Theory & Network

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

A) 0.111

B) 1.111

C) 0.81

D) 1

20 / 100

Category: Basic Electricity

20. 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

21 / 100

Category: AC Fundamental

21. Reactive power is the product of

A) V, I, sin ø

B) V, I, tan ø

C) V, I, cos ø

D) V, I

22 / 100

Category: Basic Electricity

22. Unit of resistivity is

A) Ohm/m

B) Ohm-m

C) Ohm

D) Ohm-m²

23 / 100

Category: Basic Electricity

23. The energy per unit charge is

A) Current

B) Power

C) Voltage

D) Work

24 / 100

Category: DC Machines

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

A) Flemmings Right hand rule

B) Left hand thumb rule

C) Flemmings Left hand rule

D) Palm rule

25 / 100

Category: Basic Electricity

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

A) 1,200 cycles

B) 120 cycles

C) 12 cycles

D) 1/100 cycle

26 / 100

Category: Basic Electricity

26. The reciprocal of resistivity is________

A) Impedance

B) Resistance

C) Conductivity

D) Conductance

27 / 100

Category: AC Fundamental

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

A) 90°

B) 180°

C) 0°

D) 360°

28 / 100

Category: Basic Electricity

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

A) Henry, Coulomb

B) Coulomb, Faraday

C) Henry, Faraday

D) Faraday, Henry

29 / 100

Category: Magnetic Circuit

29. Which of the following is unit less?

A) Permeability

B) Magnetic susceptibility

C) Permittivity

D) Moment of Magnet

30 / 100

Category: Basic Electricity

30. 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 directly proportional to a length 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

31 / 100

Category: AC Fundamental

31. The length of a phasor represents the amplitude

A) False

B) True

32 / 100

Category: AC Fundamental

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

A) 0.04 sec

B) 0.05 sec

C) 0.06 sec

D) 0.01 sec

33 / 100

Category: Magnetic Circuit

33. Magnetic lines of forces –

A) Intersect only in some special circumstances.

B) Are not predictable

C) Often intersect

D) Never intersect

34 / 100

Category: Basic Electricity

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

A) 70.72 A

B) 707.2 A

C) 7.07 A

D) 100 A

35 / 100

Category: Basic Electricity

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

A) True power

B) none of the above

C) Reactive power

D) Apparent power

36 / 100

Category: Basic Electricity

36. The expression for energy of an inductor

A) ½ LI

B) ½ LI^2

C) ½ L^2.I

D) L/2I

37 / 100

Category: Basic Electricity

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

A) Q + v

B) Q/v

C) Qv

D) Q-v

38 / 100

Category: Basic Electricity

38. The total resistance between A and B are?

A) 5 ohm

B) 80 ohm

C) 20 ohm

D) 0 ohm

39 / 100

Category: Magnetic Circuit

39. S.I unit of Reluctance-

A) AT/Wb

B) AT

C) AT/m

D) N/Wb

40 / 100

Category: Magnetic Circuit

40. The unit of magnetic flux is –

A) Ampere turns

B) Weber

C) Henry

D) Tesla

41 / 100

Category: Basic Electricity

41. The Inductor doesn’t allow sudden changes in

A) Inductance

B) Voltage

C) Resistance

D) Current

42 / 100

Category: Basic Electricity

42. 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

43 / 100

Category: Transformer

43. Transformer core are laminated in order to reduce –

A) Eddy current loss

B) Friction & windage loss

C) Hysteresis loss

D) Core loss

44 / 100

Category: AC Fundamental

44. Unit of impedance is

A) Ohm

B) Henry

C) Farad

D) Mho

45 / 100

Category: AC Fundamental

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

A) 141.4 V

B) 127.4 V

C) 282.8 V

D) 200 V

46 / 100

Category: Basic Electricity

46. 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) 12 A

B) Insufficient data provide

C) The largest one among the three values

D) 0 A

47 / 100

Category: AC Fundamental

47. 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

48 / 100

Category: Magnetic Circuit

48. 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) The piece of metal will lose it magnetism

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

49 / 100

Category: Basic Electricity

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

A) Conducting medium

B) Capacitive medium

C) Electrode

D) Dielectric

50 / 100

Category: Basic Electricity

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

A) Resistance does not depend on the temperature

B) Resistance depends on the temperature

C) Resistivity depend on the length

D) Resistivity depend on area of cross section

51 / 100

Category: DC Machines

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

A) Differential motor

B) Shunt motor

C) Compound motor

D) Series motor

52 / 100

Category: AC Fundamental

52. The power factor of practical inductor is

A) Leading

B) Unity

C) Zero

D) Lagging

53 / 100

Category: Basic Electricity

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

A) 6.37 V

B) 25.48 V

C) 50.96 V

D) 14.14 V

54 / 100

Category: Basic Electricity

54. The resistance of straight conductor is independent of-

A) Material

B) Shape of cross-section

C) Temperature

D) Cross-sectional area

55 / 100

Category: AC Fundamental

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

A) Permeance and Susceptance

B) Resistance and Reactance

C) Reluctance and Permeance

D) Conductance, Susceptance

56 / 100

Category: Basic Electricity

56. The unit of frequency is the hertz

A) True

B) False

57 / 100

Category: Basic Electricity

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

A) 15 ohm

B) 55 ohm

C) 75 ohm

D) 25 ohm

58 / 100

Category: Basic Electricity

58. S.I unit of Power is –

A) Watt-hr

B) Joule

C) Watt

D) Coulomb

59 / 100

Category: Magnetic Circuit

59. The principle of electromagnetic induction was propounded by

A) Orsted

B) Edison

C) Faraday

D) Flemmings

60 / 100

Category: Basic Electricity

60. 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°

61 / 100

Category: AC Fundamental

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

A) 50 Hz

B) 100 Hz

C) 314 Hz

D) 75 Hz

62 / 100

Category: DC Machines

62. 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) Fleming’s Right-hand Rule

D) Thumb Rule

63 / 100

Category: Circuit Theory & Network

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

A) Bandwidth

B) Resonant frequency

C) Q

D) None

64 / 100

Category: Basic Electricity

64. The voltage across the short is?

A) 135 V

B) 11.25 V

C) Infinity

D) Zero

65 / 100

Category: AC Fundamental

65. 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

66 / 100

Category: Magnetic Circuit

66. 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 / 2It

C) L / 2I^2 t

D) LI^2/ 2t

67 / 100

Category: Magnetic Circuit

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

A) either b or c

B) Reluctance

C) number of turns in the circuit

D) Magnitude of current

68 / 100

Category: Basic Electricity

68. Resistance of any circuit depends on –

A) Inversely 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 cross sectional area

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

69 / 100

Category: Basic Electricity

69. S.I unit of conductance is –

A) Ohm

B) Mho-m

C) Mho

D) Ohm-m

70 / 100

Category: Basic Electricity

70. What is the resistivity of Copper?

A) 7.3×10^-8 ohm-m

B) 5.35×10^-8 ohm-m

C) 1.59×10^-8 ohm-m

D) 2.7×10^-8 ohm-m

71 / 100

Category: AC Fundamental

71. The power factor of an ordinary electric bulb is

A) Slightly more than unity

B) Zero

C) Slightly less than unity

D) Unity

72 / 100

Category: AC Fundamental

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

A) Voltage

B) Current

C) Charge transfers

D) Heating effect

73 / 100

Category: Magnetic Circuit

73. 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

74 / 100

Category: Basic Electricity

74. The capacitor doesn’t allow sudden changes in

A) Current

B) Resistance

C) Voltage

D) Capacitance

75 / 100

Category: Magnetic Circuit

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

A) Both A & B

B) Oersted

C) WB/m²

D) Tesla

76 / 100

Category: Magnetic Circuit

76. Magnetic circuit is a closed path followed by –

A) M.M.F

B) flux

C) Flux density

D) None of these

77 / 100

Category: Magnetic Circuit

77. Paramagnetic materials are –

A) Strongly attracted by a magnet

B) strongly repelled by a magnet

C) slightly attracted by a magnet

D) none

78 / 100

Category: Magnetic Circuit

78. Magnetic lines of forces –

A) intersect only in some special circumstances

B) are not predictable

C) never intersect

D) often intersect

79 / 100

Category: Basic Electricity

79. Which is the most cost efficient connection?

A) Either series or parallel

B) Neither series nor parallel

C) Series

D) Parallel

80 / 100

Category: Magnetic Circuit

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

A) Flux magnitude

B) None

C) Coil resistance

D) Rate of change of flux

81 / 100

Category: Basic Electricity

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

A) R= l/( ρ.a)

B) R=ρ. (l/a)

C) R= ρ. (a/l)

D) R= a/( ρ.l)

82 / 100

Category: Basic Electricity

82. The voltage across the open circuit is?

A) 0 V

B) 100 V

C) 90 V

D) Infinity

83 / 100

Category: AC Fundamental

83. The frequency of an alternating current is –

A) The speed with which the alternator runs

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 number of cycles generated in one minute

84 / 100

Category: Magnetic Circuit

84. Magnetic field is proportional to the –

A) direction of electric charges

B) all of these

C) Quality of electric charges

D) Speed of electric charges

85 / 100

Category: AC Fundamental

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

A) Heating effect

B) Charge transfer

C) Voltage

D) Current

86 / 100

Category: Basic Electricity

86. 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) no bulb will glow

D) all the three will glow

87 / 100

Category: Circuit Theory & Network

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

A) none

B) Active component of current

C) Watt-less component of current

D) True component of current

88 / 100

Category: Basic Electricity

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

A) False

B) True

89 / 100

Category: DC Machines

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

A) Transformer

B) Choke

C) Generator

D) Thermo-couple

90 / 100

Category: DC Machines

90. 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

91 / 100

Category: AC Machines & Transformer

91. Transformer is a

A) AC Machine

B) Both A & C

C) Static device

D) DC Machine

92 / 100

Category: AC Machines & Transformer

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

A) 100%

B) 57.7%

C) 75%

D) 66.7%

93 / 100

Category: Magnetic Circuit

93. The reciprocal of permeability is –

A) Resistivity

B) reluctivity

C) Conductivity

D) MMF

94 / 100

Category: Basic Electricity

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

A) Dielectrics

B) Insulators

C) Semi-conductors

D) Conductors

95 / 100

Category: Basic Electricity

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

A) zero

B) Low

C) high

D) unity

96 / 100

Category: Basic Electricity

96. Voltage across the 60 ohm resistor is______

A) 72 V

B) 120 V

C) 0 V

D) 48 V

97 / 100

Category: Basic Electricity

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

A) ohm-meter^2

B) ohm/meter^2

C) ohm/meter

D) ohm-meter

98 / 100

Category: Basic Electricity

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

A) electrons & ions

B) positive charges

C) Atoms

D) electrons

99 / 100

Category: Basic Electricity

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

A) The amount of time the circuit

B) Equal in all branches

C) Proportional to the power in the circuit

D) Proportional to the value of the resistors

100 / 100

Category: Basic Electricity

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

A) True

B) False

Your score is

The average score is 29%

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