SSC JE Electrical / Mock Test Series : 1

Topic : Mixed Technical (Electrical Engg.)

No. of Question : 100

Type : MCQ

Time : 60 Minutes

1047

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. 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) Equal in all branches

D) The amount of time the circuit

2 / 100

Category: Basic Electricity

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

A) Atoms

B) positive charges

C) electrons

D) electrons & ions

3 / 100

Category: Magnetic Circuit

3. Paramagnetic materials are –

A) Strongly attracted by a magnet

B) none

C) slightly attracted by a magnet

D) strongly repelled by a magnet

4 / 100

Category: Basic Electricity

4. 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

5 / 100

Category: Basic Electricity

5. 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= a/( ρ.l)

D) R= ρ. (a/l)

6 / 100

Category: Basic Electricity

6. The capacitor doesn’t allow sudden changes in

A) Resistance

B) Voltage

C) Capacitance

D) Current

7 / 100

Category: Basic Electricity

7. The unit of frequency is the hertz

A) False

B) True

8 / 100

Category: Basic Electricity

8. Voltage across the 60 ohm resistor is______

A) 48 V

B) 120 V

C) 0 V

D) 72 V

9 / 100

Category: Basic Electricity

9. The total resistance between A and B are?

A) 80 ohm

B) 20 ohm

C) 5 ohm

D) 0 ohm

10 / 100

Category: Magnetic Circuit

10. Magnetic circuit is a closed path followed by –

A) Flux density

B) M.M.F

C) None of these

D) flux

11 / 100

Category: AC Fundamental

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

A) Conductance, Susceptance

B) Permeance and Susceptance

C) Resistance and Reactance

D) Reluctance and Permeance

12 / 100

Category: AC Fundamental

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

A) 1.11

B) 1.41

C) 1

D) 0.707

13 / 100

Category: AC Fundamental

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

A) 25 Hz

B) 60 Hz

C) None

D) 50 Hz

14 / 100

Category: Magnetic Circuit

14. The reciprocal of permeability is –

A) reluctivity

B) Conductivity

C) MMF

D) Resistivity

15 / 100

Category: Basic Electricity

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

A) 120 cycles

B) 1/100 cycle

C) 1,200 cycles

D) 12 cycles

16 / 100

Category: Basic Electricity

16. 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

17 / 100

Category: AC Fundamental

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

A) all of the above

B) Real power

C) True power

D) Average power

18 / 100

Category: Basic Electricity

18. What is the resistivity of Copper?

A) 7.3×10^-8 ohm-m

B) 2.7×10^-8 ohm-m

C) 1.59×10^-8 ohm-m

D) 5.35×10^-8 ohm-m

19 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Heating effect

C) Voltage

D) Current

20 / 100

Category: Basic Electricity

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

A) Q/v

B) Q-v

C) Qv

D) Q + v

21 / 100

Category: AC Machines & Transformer

21. Transformer is a

A) DC Machine

B) AC Machine

C) Static device

D) Both A & C

22 / 100

Category: AC Fundamental

22. The length of a phasor represents the amplitude

A) False

B) True

23 / 100

Category: Basic Electricity

23. The Inductor doesn’t allow sudden changes in

A) Voltage

B) Inductance

C) Resistance

D) Current

24 / 100

Category: AC Fundamental

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

A) 90°

B) 180°

C) 0°

D) 360°

25 / 100

Category: AC Fundamental

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

A) 0 and -1

B) None of these

C) 0 and 1

D) -1 and 1

26 / 100

Category: Basic Electricity

26. 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 directly proportional to a length of the wire

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

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

27 / 100

Category: Basic Electricity

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

A) True

B) False

28 / 100

Category: AC Fundamental

28. The power factor of an ordinary electric bulb is

A) Unity

B) Slightly more than unity

C) Slightly less than unity

D) Zero

29 / 100

Category: AC Fundamental

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

A) Voltage

B) Charge transfer

C) Current

D) Heating effect

30 / 100

Category: AC Fundamental

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

A) None

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

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

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

31 / 100

Category: AC Fundamental

31. Unit of impedance is

A) Farad

B) Ohm

C) Henry

D) Mho

32 / 100

Category: Basic Electricity

32. The voltage across the open circuit is?

A) 0 V

B) 90 V

C) Infinity

D) 100 V

33 / 100

Category: Basic Electricity

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

A) 75 ohm

B) 15 ohm

C) 25 ohm

D) 55 ohm

34 / 100

Category: Magnetic Circuit

34. The principle of electromagnetic induction was propounded by

A) Flemmings

B) Faraday

C) Edison

D) Orsted

35 / 100

Category: Basic Electricity

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

A) Resistivity depend on the length

B) Resistivity depend on area of cross section

C) Resistance does not depend on the temperature

D) Resistance depends on the temperature

36 / 100

Category: AC Fundamental

36. 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

37 / 100

Category: Magnetic Circuit

37. Magnetic field is proportional to the –

A) Speed of electric charges

B) direction of electric charges

C) all of these

D) Quality of electric charges

38 / 100

Category: Magnetic Circuit

38. 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

39 / 100

Category: DC Machines

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

A) Compound motor

B) Series motor

C) Shunt motor

D) Differential motor

40 / 100

Category: AC Fundamental

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

A) 314 Hz

B) 50 Hz

C) 75 Hz

D) 100 Hz

41 / 100

Category: Basic Electricity

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

A) Henry, Faraday

B) Henry, Coulomb

C) Coulomb, Faraday

D) Faraday, Henry

42 / 100

Category: AC Fundamental

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

A) 1/2 CV^2

B) All of the above

C) 1/2 QV

D) Q^2 / 2C

43 / 100

Category: Magnetic Circuit

43. Magnetic field has -

A) Only direction

B) both magnitude & direction

C) none

D) only magnitude

44 / 100

Category: Basic Electricity

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

A) 6 ohm

B) 18 ohm

C) 2 ohm

D) 9 ohm

45 / 100

Category: Magnetic Circuit

45. Magnetic lines of forces –

A) are not predictable

B) often intersect

C) never intersect

D) intersect only in some special circumstances

46 / 100

Category: Basic Electricity

46. The energy per unit charge is

A) Power

B) Voltage

C) Work

D) Current

47 / 100

Category: AC Fundamental

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

A) Charge transfers

B) Heating effect

C) Current

D) Voltage

48 / 100

Category: Basic Electricity

48. The voltage across the short is?

A) Infinity

B) 11.25 V

C) Zero

D) 135 V

49 / 100

Category: Basic Electricity

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

A) Conductors

B) Insulators

C) Semi-conductors

D) Dielectrics

50 / 100

Category: Magnetic Circuit

50. 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) None

C) Mutual inductance

D) Self-inductance

51 / 100

Category: Basic Electricity

51. Which is the most cost efficient connection?

A) Parallel

B) Either series or parallel

C) Series

D) Neither series nor parallel

52 / 100

Category: AC Fundamental

52. The power factor of practical inductor is

A) Lagging

B) Zero

C) Unity

D) Leading

53 / 100

Category: AC Fundamental

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

A) 141.4 V

B) 282.8 V

C) 127.4 V

D) 200 V

54 / 100

Category: Basic Electricity

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

A) high

B) zero

C) Low

D) unity

55 / 100

Category: Magnetic Circuit

55. Which of the following is unit less?

A) Permeability

B) Magnetic susceptibility

C) Permittivity

D) Moment of Magnet

56 / 100

Category: DC Machines

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

A) Transformer

B) Choke

C) Generator

D) Thermo-couple

57 / 100

Category: AC Fundamental

57. 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) Transformation of voltage is possible in case of AC only

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

D) Less insulation is required in case of AC

58 / 100

Category: Basic Electricity

58. 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

59 / 100

Category: Basic Electricity

59. 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

60 / 100

Category: Basic Electricity

60. 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

61 / 100

Category: Basic Electricity

61. S.I unit of conductance is –

A) Mho-m

B) Ohm-m

C) Mho

D) Ohm

62 / 100

Category: Basic Electricity

62. 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) Apparent power

D) Reactive power

63 / 100

Category: DC Machines

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

A) Pulm rule

B) Left hand thumb rule

C) Flemmings Left hand rule

D) Flemmings Right hand rule

64 / 100

Category: Magnetic Circuit

64. 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) LI^2/ 2t

C) LI / 2t

D) L / 2I^2 t

65 / 100

Category: AC Fundamental

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

A) 0.01 sec

B) 0.04 sec

C) 0.06 sec

D) 0.05 sec

66 / 100

Category: Basic Electricity

66. 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)

67 / 100

Category: Basic Electricity

67. Unit of resistivity is

A) Ohm-m²

B) Ohm

C) Ohm/m

D) Ohm-m

68 / 100

Category: Basic Electricity

68. S.I unit of Power is –

A) Joule

B) Watt-hr

C) Watt

D) Coulomb

69 / 100

Category: Basic Electricity

69. The expression for energy of an inductor

A) L/2I

B) ½ LI^2

C) ½ LI

D) ½ L^2.I

70 / 100

Category: Basic Electricity

70. Three lamps are connected in parallel across the voltage source. What happen if one lamp will burn out? –

A) no bulb will glow

B) Total current in the circuit will increase

C) all the three will glow

D) The other two lamps will glow

71 / 100

Category: Magnetic Circuit

71. Magnetic field strength is

A) N.i

B) N.ø/I

C) None of these

D) N.i / L

72 / 100

Category: Circuit Theory & Network

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

A) 0.111

B) 1

C) 1.111

D) 0.81

73 / 100

Category: Magnetic Circuit

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

A) Both A & B

B) WB/m²

C) Tesla

D) Oersted

74 / 100

Category: Magnetic Circuit

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

A) None

B) Flux magnitude

C) Rate of change of flux

D) Coil resistance

75 / 100

Category: Magnetic Circuit

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

A) Faraday

B) Lenz

C) Newton

D) Coulomb

76 / 100

Category: Basic Electricity

76. The reciprocal of resistivity is________

A) Resistance

B) Conductivity

C) Conductance

D) Impedance

77 / 100

Category: Magnetic Circuit

77. S.I unit of Reluctance-

A) AT/Wb

B) N/Wb

C) AT

D) AT/m

78 / 100

Category: DC Machines

78. 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

79 / 100

Category: Basic Electricity

79. The resistance of straight conductor is independent of-

A) Temperature

B) Shape of cross-section

C) Cross-sectional area

D) Material

80 / 100

Category: Basic Electricity

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

A) 7.07 A

B) 100 A

C) 70.72 A

D) 707.2 A

81 / 100

Category: Basic Electricity

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

A) True

B) False

82 / 100

Category: Transformer

82. Transformer core are laminated in order to reduce –

A) Friction & windage loss

B) Hysteresis loss

C) Core loss

D) Eddy current loss

83 / 100

Category: Magnetic Circuit

83. 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) Faraday's Left Hand Rule

C) Fleming's Left Hand Rule

D) Faraday's Right Hand Rule

84 / 100

Category: Basic Electricity

84. 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) all the three will glow

C) no bulb will glow

D) The other two lamps will glow

85 / 100

Category: DC Machines

85. 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

86 / 100

Category: Basic Electricity

86. Many resistors connected in series will?

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

B) Divide the current proportionally

C) Divide the voltage proportionally among all the resistor

D) Reduce the power to zero

87 / 100

Category: Basic Electricity

87. Resistance of any circuit depends on –

A) Inversely 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 directly proportionate with cross sectional area

D) Directly proportionate with length and cross sectional area

88 / 100

Category: Magnetic Circuit

88. The unit of magnetic flux is –

A) Henry

B) Weber

C) Tesla

D) Ampere turns

89 / 100

Category: AC Fundamental

89. Reactive power is the product of

A) V, I, tan ø

B) V, I, cos ø

C) V, I, sin ø

D) V, I

90 / 100

Category: Basic Electricity

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

A) Capacitive medium

B) Conducting medium

C) Electrode

D) Dielectric

91 / 100

Category: AC Fundamental

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

A) 70.7 A

B) 141 A

C) 282.8 A

D) 150 A

92 / 100

Category: AC Fundamental

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

A) High impedance

B) High Inductance

C) Low impedance

D) High capacitance

93 / 100

Category: AC Machines & Transformer

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

A) 57.7%

B) 75%

C) 66.7%

D) 100%

94 / 100

Category: Circuit Theory & Network

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

A) None

B) Resonant frequency

C) Bandwidth

D) Q

95 / 100

Category: Magnetic Circuit

95. When a permanent magnet is cut half what will be the result?

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

B) Two single pole magnets, each of the magnets only having north poles

C) The piece of metal will lose it magnetism

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

96 / 100

Category: Magnetic Circuit

96. Magnetic lines of forces –

A) Intersect only in some special circumstances.

B) Are not predictable

C) Never intersect

D) Often intersect

97 / 100

Category: Basic Electricity

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

A) 14.14 V

B) 50.96 V

C) 25.48 V

D) 6.37 V

98 / 100

Category: Basic Electricity

98. 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) 0°

C) None of the above

D) 45°

99 / 100

Category: Circuit Theory & Network

99. 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

100 / 100