SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

1241

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: Circuit Theory & Network

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

A) 1.111

B) 1

C) 0.111

D) 0.81

2 / 100

Category: DC Machines

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

A) Flemmings Right hand rule

B) Left hand thumb rule

C) Pulm rule

D) Flemmings Left hand rule

3 / 100

Category: Basic Electricity

3. 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

4 / 100

Category: Basic Electricity

4. 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) 0°

D) 45°

5 / 100

Category: Basic Electricity

5. The reciprocal of resistivity is________

A) Impedance

B) Conductivity

C) Resistance

D) Conductance

6 / 100

Category: Basic Electricity

6. Unit of resistivity is

A) Ohm-m²

B) Ohm

C) Ohm-m

D) Ohm/m

7 / 100

Category: AC Fundamental

7. Reactive power is the product of

A) V, I, tan ø

B) V, I

C) V, I, cos ø

D) V, I, sin ø

8 / 100

Category: Basic Electricity

8. The Inductor doesn’t allow sudden changes in

A) Inductance

B) Current

C) Resistance

D) Voltage

9 / 100

Category: Basic Electricity

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

A) 9 ohm

B) 18 ohm

C) 6 ohm

D) 2 ohm

10 / 100

Category: Circuit Theory & Network

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

A) none

B) True component of current

C) Watt-less component of current

D) Active component of current

11 / 100

Category: Magnetic Circuit

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

A) Tesla

B) Both A & B

C) WB/m²

D) Oersted

12 / 100

Category: AC Fundamental

12. 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

13 / 100

Category: Magnetic Circuit

13. Magnetic lines of forces –

A) Never intersect

B) Are not predictable

C) Intersect only in some special circumstances.

D) Often intersect

14 / 100

Category: Basic Electricity

14. The voltage across the open circuit is?

A) Infinity

B) 0 V

C) 90 V

D) 100 V

15 / 100

Category: Basic Electricity

15. The voltage across the short is?

A) Zero

B) 135 V

C) 11.25 V

D) Infinity

16 / 100

Category: AC Fundamental

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

A) 100 Hz

B) 50 Hz

C) 314 Hz

D) 75 Hz

17 / 100

Category: Basic Electricity

17. S.I unit of Power is –

A) Watt-hr

B) Joule

C) Watt

D) Coulomb

18 / 100

Category: Basic Electricity

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

A) Electrode

B) Capacitive medium

C) Conducting medium

D) Dielectric

19 / 100

Category: Basic Electricity

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

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

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

C) Resistance is directly proportional to an area of cross section of the wire

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

20 / 100

Category: Basic Electricity

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

A) 15 ohm

B) 25 ohm

C) 55 ohm

D) 75 ohm

21 / 100

Category: Magnetic Circuit

21. The unit of magnetic flux is –

A) Henry

B) Tesla

C) Weber

D) Ampere turns

22 / 100

Category: Basic Electricity

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

A) The amount of time the circuit

B) Proportional to the power in the circuit

C) Proportional to the value of the resistors

D) Equal in all branches

23 / 100

Category: Basic Electricity

23. S.I unit of conductance is –

A) Mho

B) Mho-m

C) Ohm-m

D) Ohm

24 / 100

Category: Basic Electricity

24. What is the resistivity of Copper?

A) 7.3×10^-8 ohm-m

B) 5.35×10^-8 ohm-m

C) 2.7×10^-8 ohm-m

D) 1.59×10^-8 ohm-m

25 / 100

Category: Basic Electricity

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

A) Infinite

B) Null

C) The value of the source voltage

D) Zero

26 / 100

Category: AC Fundamental

26. The power factor of an ordinary electric bulb is

A) Slightly less than unity

B) Slightly more than unity

C) Zero

D) Unity

27 / 100

Category: AC Fundamental

27. The power factor of practical inductor is

A) Zero

B) Lagging

C) Leading

D) Unity

28 / 100

Category: AC Fundamental

28. Unit of impedance is

A) Ohm

B) Mho

C) Farad

D) Henry

29 / 100

Category: Basic Electricity

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

A) Qv

B) Q/v

C) Q + v

D) Q-v

30 / 100

Category: Magnetic Circuit

30. Paramagnetic materials are –

A) slightly attracted by a magnet

B) Strongly attracted by a magnet

C) strongly repelled by a magnet

D) none

31 / 100

Category: Basic Electricity

31. The expression for energy of an inductor

A) ½ LI

B) L/2I

C) ½ LI^2

D) ½ L^2.I

32 / 100

Category: Basic Electricity

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

A) unity

B) high

C) zero

D) Low

33 / 100

Category: AC Fundamental

33. The length of a phasor represents the amplitude

A) False

B) True

34 / 100

Category: Basic Electricity

34. Many resistors connected in series will?

A) Divide the current proportionally

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

C) Divide the voltage proportionally among all the resistor

D) Reduce the power to zero

35 / 100

Category: Basic Electricity

35. Which is the most cost efficient connection?

A) Parallel

B) Either series or parallel

C) Series

D) Neither series nor parallel

36 / 100

Category: Basic Electricity

36. Voltage across the 60 ohm resistor is______

A) 120 V

B) 0 V

C) 72 V

D) 48 V

37 / 100

Category: DC Machines

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

A) Differential motor

B) Compound motor

C) Series motor

D) Shunt motor

38 / 100

Category: Basic Electricity

38. The energy per unit charge is

A) Current

B) Work

C) Power

D) Voltage

39 / 100

Category: DC Machines

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

A) Choke

B) Thermo-couple

C) Generator

D) Transformer

40 / 100

Category: Basic Electricity

40. 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

41 / 100

Category: Basic Electricity

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

A) Henry, Faraday

B) Faraday, Henry

C) Coulomb, Faraday

D) Henry, Coulomb

42 / 100

Category: Magnetic Circuit

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

A) Newton

B) Faraday

C) Lenz

D) Coulomb

43 / 100

Category: AC Fundamental

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

A) Heating effect

B) Current

C) Voltage

D) Charge transfers

44 / 100

Category: AC Fundamental

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

A) Current

B) Charge transfers

C) Heating effect

D) Voltage

45 / 100

Category: Magnetic Circuit

45. 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

46 / 100

Category: Magnetic Circuit

46. Which of the following is unit less?

A) Moment of Magnet

B) Permittivity

C) Magnetic susceptibility

D) Permeability

47 / 100

Category: Magnetic Circuit

47. S.I unit of Reluctance-

A) AT/Wb

B) AT

C) N/Wb

D) AT/m

48 / 100

Category: AC Machines & Transformer

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

A) 57.7%

B) 100%

C) 66.7%

D) 75%

49 / 100

Category: Magnetic Circuit

49. The principle of electromagnetic induction was propounded by

A) Flemmings

B) Faraday

C) Orsted

D) Edison

50 / 100

Category: Basic Electricity

50. The capacitor doesn’t allow sudden changes in

A) Voltage

B) Resistance

C) Capacitance

D) Current

51 / 100

Category: AC Fundamental

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

A) 1.41

B) 0.707

C) 1

D) 1.11

52 / 100

Category: AC Fundamental

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

A) 282.8 V

B) 200 V

C) 141.4 V

D) 127.4 V

53 / 100

Category: Transformer

53. Transformer core are laminated in order to reduce –

A) Eddy current loss

B) Friction & windage loss

C) Core loss

D) Hysteresis loss

54 / 100

Category: Basic Electricity

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

A) False

B) True

55 / 100

Category: Basic Electricity

55. 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

56 / 100

Category: Magnetic Circuit

56. 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) Capacitance

D) None

57 / 100

Category: Magnetic Circuit

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

A) either b or c

B) Reluctance

C) Magnitude of current

D) number of turns in the circuit

58 / 100

Category: AC Fundamental

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

A) 360°

B) 90°

C) 180°

D) 0°

59 / 100

Category: Basic Electricity

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

A) It becomes zero

B) It becomes infinity

C) It becomes double its original value

D) It becomes half its original value

60 / 100

Category: Magnetic Circuit

60. The reciprocal of permeability is –

A) reluctivity

B) MMF

C) Conductivity

D) Resistivity

61 / 100

Category: Magnetic Circuit

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

A) None

B) Coil resistance

C) Flux magnitude

D) Rate of change of flux

62 / 100

Category: Basic Electricity

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

A) True power

B) Apparent power

C) none of the above

D) Reactive power

63 / 100

Category: Magnetic Circuit

63. Magnetic lines of forces –

A) often intersect

B) are not predictable

C) never intersect

D) intersect only in some special circumstances

64 / 100

Category: AC Fundamental

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

A) Average power

B) True power

C) Real power

D) all of the above

65 / 100

Category: Magnetic Circuit

65. 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

66 / 100

Category: Magnetic Circuit

66. Magnetic field strength is

A) N.i / L

B) N.i

C) N.ø/I

D) None of these

67 / 100

Category: AC Fundamental

67. 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

68 / 100

Category: Basic Electricity

68. 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) The other two lamps will glow

C) Total current in the circuit will increase

D) no bulb will glow

69 / 100

Category: Basic Electricity

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

A) positive charges

B) electrons & ions

C) Atoms

D) electrons

70 / 100

Category: AC Machines & Transformer

70. Transformer is a

A) AC Machine

B) Static device

C) DC Machine

D) Both A & C

71 / 100

Category: AC Fundamental

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

A) 25 Hz

B) 60 Hz

C) 50 Hz

D) None

72 / 100

Category: DC Machines

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

A) Thumb Rule

B) Fleming’s Right-hand Rule

C) Lenz’s Law

D) Fleming’s Left-hand Rule

73 / 100

Category: Basic Electricity

73. 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)

74 / 100

Category: AC Fundamental

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

A) Voltage

B) Charge transfer

C) Heating effect

D) Current

75 / 100

Category: Magnetic Circuit

75. Magnetic field is proportional to the –

A) Quality of electric charges

B) direction of electric charges

C) Speed of electric charges

D) all of these

76 / 100

Category: Basic Electricity

76. Resistance of any circuit depends on –

A) Directly proportionate with length and cross sectional area

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

C) Inversely proportionate with length and cross sectional area

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

77 / 100

Category: AC Fundamental

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

A) 1/2 QV

B) Q^2 / 2C

C) All of the above

D) 1/2 CV^2

78 / 100

Category: Basic Electricity

78. The total resistance between A and B are?

A) 80 ohm

B) 0 ohm

C) 5 ohm

D) 20 ohm

79 / 100

Category: AC Fundamental

79. 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

80 / 100

Category: Magnetic Circuit

80. Magnetic circuit is a closed path followed by –

A) flux

B) None of these

C) Flux density

D) M.M.F

81 / 100

Category: Basic Electricity

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

A) False

B) True

82 / 100

Category: Basic Electricity

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

A) ohm-meter

B) ohm/meter

C) ohm-meter^2

D) ohm/meter^2

83 / 100

Category: Basic Electricity

83. 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

84 / 100

Category: Basic Electricity

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

A) 120 cycles

B) 12 cycles

C) 1,200 cycles

D) 1/100 cycle

85 / 100

Category: Basic Electricity

85. The unit of frequency is the hertz

A) False

B) True

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) no bulb will glow

B) all the three will glow

C) Total current in the circuit will increase

D) The other two lamps will glow

87 / 100

Category: AC Fundamental

87. 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

88 / 100

Category: Basic Electricity

88. 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)

89 / 100

Category: Magnetic Circuit

89. 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 / 2I^2 t

C) LI^2/ 2t

D) L / 2It

90 / 100

Category: Basic Electricity

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

A) Insulators

B) Dielectrics

C) Conductors

D) Semi-conductors

91 / 100

Category: Basic Electricity

91. 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

92 / 100

Category: AC Fundamental

92. 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

93 / 100

Category: Basic Electricity

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

A) 6.37 V

B) 50.96 V

C) 14.14 V

D) 25.48 V

94 / 100

Category: AC Fundamental

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

A) Permeance and Susceptance

B) Conductance, Susceptance

C) Reluctance and Permeance

D) Resistance and Reactance

95 / 100

Category: Basic Electricity

95. The resistance of straight conductor is independent of-

A) Cross-sectional area

B) Material

C) Shape of cross-section

D) Temperature

96 / 100

Category: Circuit Theory & Network

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

A) Q

B) None

C) Bandwidth

D) Resonant frequency

97 / 100

Category: AC Fundamental

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

A) 0.06 sec

B) 0.05 sec

C) 0.04 sec

D) 0.01 sec

98 / 100

Category: AC Fundamental

98. 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

99 / 100

Category: Magnetic Circuit

99. Magnetic field has -

A) Only direction

B) both magnitude & direction

C) none

D) only magnitude

100 / 100

Category: DC Machines

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

A) Left hand thumb rule

B) Palm rule

C) Flemmings Left hand rule

D) Flemmings Right hand rule

Your score is

The average score is 29%

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