SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

906

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. 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= l/( ρ.a)

D) R= ρ. (a/l)

2 / 100

Category: Basic Electricity

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

A) It becomes infinity

B) It becomes double its original value

C) It becomes zero

D) It becomes half its original value

3 / 100

Category: Basic Electricity

3. S.I unit of conductance is –

A) Ohm

B) Mho-m

C) Mho

D) Ohm-m

4 / 100

Category: DC Machines

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

A) Differential motor

B) Series motor

C) Compound motor

D) Shunt motor

5 / 100

Category: AC Fundamental

5. Reactive power is the product of

A) V, I, sin ø

B) V, I, cos ø

C) V, I

D) V, I, tan ø

6 / 100

Category: Basic Electricity

6. 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 inversely proportional to the resistivity of the wire

D) Resistance is directly proportional to a length of the wire

7 / 100

Category: Magnetic Circuit

7. 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) Mutual inductance

C) None

D) Capacitance

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) 45°

B) 0°

C) 40°

D) None of the above

9 / 100

Category: Magnetic Circuit

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

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

D) The piece of metal will lose it magnetism

10 / 100

Category: Basic Electricity

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

A) high

B) Low

C) unity

D) zero

11 / 100

Category: Magnetic Circuit

11. Magnetic lines of forces –

A) intersect only in some special circumstances

B) are not predictable

C) often intersect

D) never intersect

12 / 100

Category: Basic Electricity

12. 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

13 / 100

Category: DC Machines

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

A) Palm rule

B) Flemmings Left hand rule

C) Flemmings Right hand rule

D) Left hand thumb rule

14 / 100

Category: Basic Electricity

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

A) 1/100 cycle

B) 1,200 cycles

C) 120 cycles

D) 12 cycles

15 / 100

Category: Magnetic Circuit

15. Magnetic lines of forces –

A) Intersect only in some special circumstances.

B) Never intersect

C) Often intersect

D) Are not predictable

16 / 100

Category: Magnetic Circuit

16. S.I unit of Reluctance-

A) AT

B) AT/Wb

C) AT/m

D) N/Wb

17 / 100

Category: Basic Electricity

17. The Inductor doesn’t allow sudden changes in

A) Resistance

B) Current

C) Inductance

D) Voltage

18 / 100

Category: AC Fundamental

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

A) 200 V

B) 141.4 V

C) 282.8 V

D) 127.4 V

19 / 100

Category: DC Machines

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

A) Left hand thumb rule

B) Flemmings Left hand rule

C) Flemmings Right hand rule

D) Pulm rule

20 / 100

Category: Basic Electricity

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

A) 2 ohm

B) 18 ohm

C) 9 ohm

D) 6 ohm

21 / 100

Category: Circuit Theory & Network

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

A) 0.81

B) 0.111

C) 1

D) 1.111

22 / 100

Category: AC Fundamental

22. 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) Less insulation is required in case of AC

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

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

23 / 100

Category: AC Fundamental

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

A) Reluctance and Permeance

B) Resistance and Reactance

C) Conductance, Susceptance

D) Permeance and Susceptance

24 / 100

Category: Basic Electricity

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

A) ohm/meter

B) ohm-meter^2

C) ohm-meter

D) ohm/meter^2

25 / 100

Category: Basic Electricity

25. The energy per unit charge is

A) Power

B) Voltage

C) Work

D) Current

26 / 100

Category: AC Fundamental

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

A) all of the above

B) Average power

C) Real power

D) True power

27 / 100

Category: Basic Electricity

27. The reciprocal of resistivity is________

A) Conductance

B) Conductivity

C) Resistance

D) Impedance

28 / 100

Category: Circuit Theory & Network

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

A) Watt-less component of current

B) none

C) Active component of current

D) True component of current

29 / 100

Category: AC Fundamental

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

A) Low impedance

B) High capacitance

C) High impedance

D) High Inductance

30 / 100

Category: Basic Electricity

30. Resistance of any circuit depends on –

A) Directly proportionate with length and cross sectional area

B) Inversely proportionate with length and cross sectional area

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

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

31 / 100

Category: Basic Electricity

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

A) Q-v

B) Q + v

C) Q/v

D) Qv

32 / 100

Category: Basic Electricity

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

A) 55 ohm

B) 15 ohm

C) 25 ohm

D) 75 ohm

33 / 100

Category: Magnetic Circuit

33. The unit of magnetic flux is –

A) Henry

B) Ampere turns

C) Tesla

D) Weber

34 / 100

Category: Basic Electricity

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

A) Resistivity depend on area of cross section

B) Resistivity depend on the length

C) Resistance does not depend on the temperature

D) Resistance depends on the temperature

35 / 100

Category: Basic Electricity

35. S.I unit of Power is –

A) Coulomb

B) Joule

C) Watt

D) Watt-hr

36 / 100

Category: AC Machines & Transformer

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

A) 75%

B) 100%

C) 66.7%

D) 57.7%

37 / 100

Category: Basic Electricity

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

A) True

B) False

38 / 100

Category: Transformer

38. Transformer core are laminated in order to reduce –

A) Core loss

B) Friction & windage loss

C) Eddy current loss

D) Hysteresis loss

39 / 100

Category: AC Fundamental

39. Unit of impedance is

A) Farad

B) Mho

C) Henry

D) Ohm

40 / 100

Category: AC Fundamental

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

A) 90°

B) 0°

C) 360°

D) 180°

41 / 100

Category: Basic Electricity

41. 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) 12 A

C) 0 A

D) The largest one among the three values

42 / 100

Category: AC Fundamental

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

A) 1/2 CV^2

B) Q^2 / 2C

C) All of the above

D) 1/2 QV

43 / 100

Category: Basic Electricity

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

A) Dielectrics

B) Conductors

C) Semi-conductors

D) Insulators

44 / 100

Category: Magnetic Circuit

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

A) Oersted

B) Tesla

C) Both A & B

D) WB/m²

45 / 100

Category: AC Fundamental

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

A) 0.05 sec

B) 0.01 sec

C) 0.04 sec

D) 0.06 sec

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. The capacitor doesn’t allow sudden changes in

A) Voltage

B) Resistance

C) Capacitance

D) Current

48 / 100

Category: Basic Electricity

48. 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

49 / 100

Category: DC Machines

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

A) Transformer

B) Generator

C) Thermo-couple

D) Choke

50 / 100

Category: Magnetic Circuit

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

A) Magnitude of current

B) either b or c

C) Reluctance

D) number of turns in the circuit

51 / 100

Category: AC Fundamental

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

A) Voltage

B) Charge transfer

C) Heating effect

D) Current

52 / 100

Category: Basic Electricity

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

A) Henry, Coulomb

B) Henry, Faraday

C) Faraday, Henry

D) Coulomb, Faraday

53 / 100

Category: Basic Electricity

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

A) Proportional to the power in the circuit

B) Proportional to the value of the resistors

C) The amount of time the circuit

D) Equal in all branches

54 / 100

Category: AC Machines & Transformer

54. Transformer is a

A) Both A & C

B) AC Machine

C) DC Machine

D) Static device

55 / 100

Category: AC Fundamental

55. The power factor of an ordinary electric bulb is

A) Unity

B) Zero

C) Slightly more than unity

D) Slightly less than unity

56 / 100

Category: Basic Electricity

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

A) 100 A

B) 70.72 A

C) 707.2 A

D) 7.07 A

57 / 100

Category: Basic Electricity

57. Voltage across the 60 ohm resistor is______

A) 120 V

B) 0 V

C) 72 V

D) 48 V

58 / 100

Category: Basic Electricity

58. The voltage across the open circuit is?

A) 90 V

B) Infinity

C) 0 V

D) 100 V

59 / 100

Category: Magnetic Circuit

59. 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 Left Hand Rule

D) Fleming's Right Hand Rule

60 / 100

Category: Magnetic Circuit

60. Magnetic circuit is a closed path followed by –

A) flux

B) M.M.F

C) None of these

D) Flux density

61 / 100

Category: Magnetic Circuit

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

A) Lenz

B) Newton

C) Coulomb

D) Faraday

62 / 100

Category: Basic Electricity

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

A) Infinite

B) The value of the source voltage

C) Zero

D) Null

63 / 100

Category: AC Fundamental

63. The frequency of an alternating current is –

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

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

C) The speed with which the alternator runs

D) The number of cycles generated in one minute

64 / 100

Category: Basic Electricity

64. Which is the most cost efficient connection?

A) Neither series nor parallel

B) Either series or parallel

C) Series

D) Parallel

65 / 100

Category: AC Fundamental

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

A) 0.707

B) 1.41

C) 1.11

D) 1

66 / 100

Category: Basic Electricity

66. 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) The other two lamps will glow

D) all the three will glow

67 / 100

Category: Basic Electricity

67. The resistance of straight conductor is independent of-

A) Material

B) Cross-sectional area

C) Shape of cross-section

D) Temperature

68 / 100

Category: Basic Electricity

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

A) Reactive power

B) none of the above

C) Apparent power

D) True power

69 / 100

Category: AC Fundamental

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

A) -1 and 1

B) None of these

C) 0 and -1

D) 0 and 1

70 / 100

Category: Basic Electricity

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

A) 50.96 V

B) 14.14 V

C) 25.48 V

D) 6.37 V

71 / 100

Category: Basic Electricity

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

A) False

B) True

72 / 100

Category: AC Fundamental

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

A) 282.8 A

B) 141 A

C) 150 A

D) 70.7 A

73 / 100

Category: Magnetic Circuit

73. 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

74 / 100

Category: Magnetic Circuit

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

A) Coil resistance

B) None

C) Rate of change of flux

D) Flux magnitude

75 / 100

Category: Magnetic Circuit

75. Magnetic field strength is

A) N.ø/I

B) N.i

C) None of these

D) N.i / L

76 / 100

Category: Basic Electricity

76. 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) no bulb will glow

D) The other two lamps will glow

77 / 100

Category: Magnetic Circuit

77. The principle of electromagnetic induction was propounded by

A) Faraday

B) Edison

C) Flemmings

D) Orsted

78 / 100

Category: AC Fundamental

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

A) None

B) 50 Hz

C) 60 Hz

D) 25 Hz

79 / 100

Category: Basic Electricity

79. The expression for energy of an inductor

A) ½ LI^2

B) ½ LI

C) L/2I

D) ½ L^2.I

80 / 100

Category: Magnetic Circuit

80. 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 / 2It

B) L / 2I^2 t

C) LI^2/ 2t

D) LI / 2t

81 / 100

Category: AC Fundamental

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

A) 50 Hz

B) 314 Hz

C) 100 Hz

D) 75 Hz

82 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Current

C) Voltage

D) Heating effect

83 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Heating effect

C) Voltage

D) Current

84 / 100

Category: Magnetic Circuit

84. The reciprocal of permeability is –

A) Resistivity

B) MMF

C) reluctivity

D) Conductivity

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) All the three will glow

B) No bulb will glow

C) Total current in the circuit will increase

D) The other two lamps will glow

86 / 100

Category: Basic Electricity

86. The total resistance between A and B are?

A) 80 ohm

B) 5 ohm

C) 20 ohm

D) 0 ohm

87 / 100

Category: Circuit Theory & Network

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

A) Resonant frequency

B) None

C) Bandwidth

D) Q

88 / 100

Category: Basic Electricity

88. The unit of frequency is the hertz

A) True

B) False

89 / 100

Category: Basic Electricity

89. What is the resistivity of Copper?

A) 5.35×10^-8 ohm-m

B) 2.7×10^-8 ohm-m

C) 7.3×10^-8 ohm-m

D) 1.59×10^-8 ohm-m

90 / 100

Category: AC Fundamental

90. The length of a phasor represents the amplitude

A) False

B) True

91 / 100

Category: DC Machines

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

A) Fleming’s Right-hand Rule

B) Lenz’s Law

C) Thumb Rule

D) Fleming’s Left-hand Rule

92 / 100

Category: Basic Electricity

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

A) Electrode

B) Conducting medium

C) Capacitive medium

D) Dielectric

93 / 100

Category: AC Fundamental

93. The power factor of practical inductor is

A) Leading

B) Zero

C) Unity

D) Lagging

94 / 100

Category: Magnetic Circuit

94. Paramagnetic materials are –

A) slightly attracted by a magnet

B) none

C) Strongly attracted by a magnet

D) strongly repelled by a magnet

95 / 100

Category: Magnetic Circuit

95. Which of the following is unit less?

A) Permeability

B) Moment of Magnet

C) Magnetic susceptibility

D) Permittivity

96 / 100

Category: Basic Electricity

96. The voltage across the short is?

A) 11.25 V

B) 135 V

C) Zero

D) Infinity

97 / 100

Category: Magnetic Circuit

97. Magnetic field has -

A) Only direction

B) none

C) only magnitude

D) both magnitude & direction

98 / 100

Category: AC Fundamental

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

A) None

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

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

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

99 / 100

Category: Basic Electricity

99. Unit of resistivity is

A) Ohm/m

B) Ohm

C) Ohm-m²

D) Ohm-m

100 / 100

Category: Basic Electricity

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

A) positive charges

B) electrons

C) electrons & ions

D) Atoms

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The average score is 28%

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