SSC Junior Engineer Electrical Online Exam 2017 CPWD/CWC/MES Electrical Engineering 1-03-2017 Morning

1. Which of the following statements about the force between two chages is true ?

A) No force exists between two unlike charges
B) A force of repulsion exists between two like charges
C) Like charges attract each other
D) Unlike charge repel each other

... Answer is B)
Explanation will provide as soon as possible.

2. The electrons revolve around the nucleus with high velocity. Which type of force acts against the centrifugal force and keeps the electrons in their orbits ?

A) Electrostatic force of attraction
B) Electromagnetic force of attraction
C) Gravitational force
D) Adhesive force

... Answer is A)
Explanation will provide as soon as possible.

3. What is the difference between an atom and an ion ?

A) Ions can only exist in liquid solutions
B) Ions have always larger mass than the atoms of the same element
C) Ions are neutral paricles while atoms always carry a positive charge
D) Ions are always charged particles while the atoms are neutral as a whole

... Answer is D)
Explanation will provide as soon as possible.

4. Which of the following statements is true about the conductor position marked 1 in the figure ?

A) This point of the conductor has a definite potential against earth
B) This point of the conductor has a definite voltage
C) An electric current flows through the conductor
D) Protons flow through the conductor

... Answer is C)
Explanation will provide as soon as possible.

5. In the circuit shown below, how will the voltage V1 and V2 change when the switch 'S' is closed ?

A) V1 increases, V2 decreases
B) V1 decreases, V2 increases
C) V1 increases, V2 increases
D) V1 decreases, V2 decreases

... Answer is B)
Explanation will provide as soon as possible.

6. Which particles act as a current carrier in a metallic conductor ?

A) Only holes
B) Both electrons and holes
C) Only electrons
D) None ot these

... Answer is C)
Explanation will provide as soon as possible.

7. Figure lamp shown in the picture is switched on. From the moment of switching on, how long does it takes it take for the lamp to glow ?

A) the time, practically, is zero because the velocity of the propagation of electric current is almost that of light
B) 3 seconds because the electric current travels at the velocity of sound
C) about 1 second
D) about 0.1 second

... Answer is A)
Explanation will provide as soon as possible.

8. Electrons flow through the metallic conductor shown in the figure. What is the approximate velocity of these electrons ?

A) Approximately equal to the velocity of sound
B) Approximately equal to the velocity of light
C) Approximately 2/3 of the velocity of light
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

9. An electric current carrying conductor placed in the magnetic field as shown in figure below. The force experienced on the conductor acts ?

A) down ward
B) up ward
C) to the right
D) to the left

... Answer is A)
Explanation will provide as soon as possible.

10. If three resistances of values 2Ω, 3Ω and 6Ω be connected as shown in the diagram, what will be the effective resistance ?

A) 2Ω
B) 3Ω
C) 4Ω
D) 6Ω

... Answer is C)
Explanation will provide as soon as possible.

11. If the current flows in an anti-clockwise direction, then the polarity of the nearer pole will be_ ?

A) south pole
B) noth pole
C) no polarity
D) both the polarities

... Answer is B)
Explanation will provide as soon as possible.

12. The electromagnets is made of_ ?

A) soft iron core with current passing around it
B) soft iron core
C) steel core with current passing around it
D) steel core

... Answer is A)
Explanation will provide as soon as possible.

13. Which of the resistances is represented by the curve system ?

A) Layer resistance
B) Potentiometer
C) Cold conductor (ptc)
D) Hot conductor (ntc)

... Answer is C)
Explanation will provide as soon as possible.

14. The resistance of a conductor, when its temperature is increased_ ?

A) remains constant
B) decreases
C) varies
D) increases

... Answer is D)
Explanation will provide as soon as possible.

15. In RLC circuits, the electric current at resonance is_ ?

A) maximum in series circuit and minimum in parallel circuit.
B) maximum in parallel circuit and minimum in series circuit
C) maximum in both the circuits
D) minimum in both the circuits

... Answer is A)
Explanation will provide as soon as possible.

16. Which of the following does not have dual relationship ?

A) Inductance-Capacitance
B) Current-Voltage
C) Resistance- Reactance
D) Tie-set-Cut-Set

... Answer is C)
Explanation will provide as soon as possible.

17. What other of the electric current is also present in the fluorescent lamp and causes losses in the efficiency of the lamp ?

A) The chemical effect
B) The magnetic effect
C) The heating effect
D) The chemical and the magnetic effect

... Answer is B)
Explanation will provide as soon as possible.

18. The maximum power in the shown load is ?

A) 25W
B) 30.6W
C) 62.5W
D) 110W

... Answer is C)
Explanation will provide as soon as possible.

19. The number of mesh currents required in the circuit given below is ?

A) 3
B) 4
C) 5
D) 6

... Answer is C)
Explanation will provide as soon as possible.

20. In the circuit shown below the voltage function is v(t) = 150 sin ωt. The everage power in the resistance 'R' will be ?

A) 300W
B) 450W
C) 750W
D) 700W

... Answer is B)
Explanation will provide as soon as possible.

21. Frequency multiplication by a resistor can be achieved, if ?

A) it is carbon
B) it is wire wound
C) it is a diode
D) it is nichrome

... Answer is C)
Explanation will provide as soon as possible.

22. At time t = 0+ with zero initial condition, which of the following acts as an open circuit ?
i. Inductor
ii. Capacitor
iii. Resistor

A) Only i
B) Only ii
C) Only iii
D) i, ii and iii

... Answer is A)
Explanation will provide as soon as possible.

23. The elements in RCL series circuit are_ ?

A) Resistance only
B) Inductance only
C) Capacitance only
D) Resistance, inductance and capacitance

... Answer is D)
Explanation will provide as soon as possible.

24. When a source is delivering maximum power to a load, the efficiency of the circuit_ ?

A) is always 50%
B) depends on the circuit parameters
C) is always 75%
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

25. The Thevenin and Norton equivalent circuits of a D.C network are shown in Figure. The values of current I and resistance R in the Norton equivalent are ?

A) 2.5A, 2Ω
B) 2.5A, 0.5Ω
C) –2.5A, 2Ω
D) –2.5A, 0.5Ω

... Answer is A)
Explanation will provide as soon as possible.

26. The electric current in an RLC series circuit at resonance is ?

A) minimum
B) maximum
C) infinity
D) zero

... Answer is B)
Explanation will provide as soon as possible.

27. At a frequency less than the resonant frequency_ ?

A) both circuits are inductive
B) series circuit is inductive and parallel circuit is capacitive
C) series circuit is capacitive and parallel circuit is inductive
D) both circuits are capacitive

... Answer is C)
Explanation will provide as soon as possible.

28. The value of current at resonance in a series RLC circuit is affected by the value of ?

A) R
B) L
C) C
D) R,L,C

... Answer is A)
Explanation will provide as soon as possible.

29. In series LCR circuit, at resonance ?

A) current is maximum, power factor is unity
B) current is maximum, power factor is zero
C) current is minimum, power factor is unity
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

30. The Superposition Theorem is applicable to ?

A) voltage
B) current only
C) both current and voltage
D) current, voltage and power

... Answer is C)
Explanation will provide as soon as possible.

31. Canveyor-based method is used for the measurement of the flow of ?

A) Gas
B) Liquid
C) Solids
D) None of these

... Answer is C)
Explanation will provide as soon as possible.

32. Match List-1 (quantity) with List-2 (transducer) and select the correct answer using the codes given below the list ?

A) P-1; Q-2; R-3
B) P-1; Q-3; R-2
C) P-3; Q-1; R-2
D) P-3; Q-2; R-1

... Answer is C)
Explanation will provide as soon as possible.

33. Which is the most suitable thermocouple transducer for the measurement of temperature in the range of 1300 0C to 15000C ?

A) Platinum-rhodium
B) Chromel-alumel
C) Iron-constantan
D) Chromel- constantan

... Answer is A)
Explanation will provide as soon as possible.

34. Consider the following statement: A Linear Variable Differential Transformer (LVDT) has i. One primary winding ii. Two exactly similar secondary windings iii. A toroidal magnetic core Of these statements which is/are correct ?

A) i & iii
B) ii & iii
C) i & ii
D) i, ii & iii

... Answer is C)
Explanation will provide as soon as possible.

35. Match List-1 (transducer) with List-2 (input/output variables) and select the correct answer using the codes given below the list ?

A) P-3; Q-4; R-1; S-2
B) P- 2; Q-1; R-4; S-3
C) P-2; Q-4; R-1; S-3
D) P-3; Q-4; R-2; S-1

... Answer is A)
Explanation will provide as soon as possible.

36. Applications of precision diode are:
i. half wave rectifier
ii. peak detector
iii. window detector

A) i & iii
B) i, & ii
C) i, ii & iii
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

37. Watt-meters can be grouped under ?

A) Moving coil instruments
B) Moving iron instruments
C) Electro dynamo meter instruments
D) None of these

... Answer is C)
Explanation will provide as soon as possible.

38. In which of the following do the measurements find their application?
i. Automatic control of processes & operations
ii. Engineering experimental analysis
iii. Monitoring of processes and operations ?

A) i only
B) i and ii
C) ii and iii
D) i, ii and iii

... Answer is D)
Explanation will provide as soon as possible.

39. Multi-meters are provided with separate scale for low ac voltages to_ ?

A) have high accuracy only
B) improve readability of the scale only
C) have high accuracy and improve readability of the scale
D) None of these

... Answer is D)
Explanation will provide as soon as possible.

40. A voltmeter with a broadband width has ?

A) high noise level and high sensitivity
B) high noise level and low sensitivity
C) low noise level and high sensitivity
D) low noise level and low sensitivity

... Answer is B)
Explanation will provide as soon as possible.

41. For what voltage levels are the screwed conduit circuits used ?

A) Between 250V-600V
B) Less than 250V/250V
C) Above 600V
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

42. What is an electrical schedule?
i. A list or a plan of a building providing information of number of points in each room.
ii. The list of all the electrical components required for a particular room
iii. The list all the electrical components along with their prices ?

A) Only i
B) Only ii
C) Bothe ii and iii
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

43. Which among these is a method of wiring? i. Joint box
ii. Tee system
iii. Loop in system

A) Only i
B) Only ii
C) Only iii
D) i, ii & iii

... Answer is D)
Explanation will provide as soon as possible.

44. Which among the follwing information is required for a good estimation?
i. Availability of products
ii. Sources of production, vendor selection
iii. New products and their quality
iv. Prices and the discouts provided for each product

A) i & ii
B) ii, iii & iv
C) Only iv
D) i, ii, iii & iv

... Answer is D)
Explanation will provide as soon as possible.

45. Which material is used for wiring continous bus bar?
i. Aluminium
ii. Copper ?

A) only i
B) Only ii
C) Both i and ii
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

46. What is meant by contingencies?
i. The list of required components are included in this category
ii. The list of vague and unforeseen items is included in this category
iii. The list of components along with their discounted prices is included in this category ?

A) Only i
B) Only ii
C) Only iii
D) Both ii and iii

... Answer is B)
Explanation will provide as soon as possible.

47. Which among the following mode of tendring is used by purchase department?
i. Open tendering
ii. Limited tender
iii. Spot tendering
iv. Global tendering
v. Proprietary tender ?

A) Only i, ii, iii and v
B) Only i and iv
C) Only i, iii and iv
D) i, ii, iii, iv and v

... Answer is B)
Explanation will provide as soon as possible.

48. What is the maximum load that can be connected in a circuit connecting only lighting points ?

A) 500 watts
B) 750 watts
C) 800 watts
D) 1000 watts

... Answer is C)
Explanation will provide as soon as possible.

49. What is ment by petty puchase ?

A) An item purchased from market by purchase assistant without proper formal order
B) An item purchased from market by puchase assistan with proper formal order
C) A single tendering purchase
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

50. What is the maximum number of lighting points that can be connected in a circuit ?

A) 2
B) 5
C) 8
D) 10

... Answer is D)
Explanation will provide as soon as possible.

51. In an intrinsic semiconductor ?

A) number of holes is equal to number of electrons
B) there are no holes in the material
C) electrons in the material are more than holes
D) there are no electrons in the material

... Answer is A)
Explanation will provide as soon as possible.

52. The minority of carrier concentration is largely a function of ?

A) the amount of doping
B) forward biasing voltage
C) temperature
D) reverse biasing voltage

... Answer is C)
Explanation will provide as soon as possible.

53. In the depletion region of a PN junction, there are ?

A) no mobile charges
B) no charge
C) no current
D) None of thses

... Answer is A)
Explanation will provide as soon as possible.

54. The donor atoms in an N-type semi-conductor at normal temperature ?

A) carry a positve charge
B) are neutral
C) carry a negative charge
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

55. In a synchronous motor ?

A) the speed of rotor MMF is slightly less than the speed of stator MMF
B) the rotor MMF and stator MMF are stationary with respect to each other
C) the speed of rotor MMF is slightly more than speed of stator MMF
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

56. The break test for the determination of efficiency of a D.C. machine is ?

A) a regenerative mathod
B) a direct method
C) an indirect method
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

57. Commutation conditions at full-load a large D.C machine can be checked by ?

A) hopkinson's test
B) swinburne's test
C) brake test
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

58. The load carried by V-V connection is ?

A) 47.7% of the original load
B) 57.7% of the original load
C) 67.7% of the original load
D) 87.7% of the original load

... Answer is B)
Explanation will provide as soon as possible.

59. D.C. motors should be stopped by opening the line switches and not by forcing the starter handle back to the off position because:
i. heavy sparking occurs at the brushes.
ii. heavy sparking occurs at the first stud of the starting resistance steps ?

A) Only i
B) Only ii
C) Both i and ii
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

60. In D.C. motor starters are used:
i. To increase the starting torque
ii. To limit the starting current

A) Only i
B) Only ii
C) Both i and ii
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

61. The voltage regulation of a transformer having copper loss 1% of output and percentage reactance drop of 5% and power factor 0.9 lagging is ?

A) -3.08%
B) 3%
C) 3.08%
D) 3.8%

... Answer is C)
Explanation will provide as soon as possible.

62. The full load slip of a 4-pole, 50Hz, 3-phase Iduction motor rotating at 1410 r.p.m is ?

A) 1%
B) 2%
C) 6%
D) 9%

... Answer is C)
Explanation will provide as soon as possible.

63. A 4-pole, lap wound, D.C. generator has the following details: Flux = 0.07 web/pole, speed = 900r.p.m, Armature conductors = 440. The generated e.m.f. is ?

A) 400V
B) 462V
C) 502V
D) 900V

... Answer is B)
Explanation will provide as soon as possible.

64. Condition for maximum power delivered in D.C. Generator is ?

A) Back EMF = Supply voltage
B) Back EMF = (Supply voltage/4)
C) Back EMF = (Supply voltage/2)
D) Back EMF = (Supply voltage/9)

... Answer is C)
Explanation will provide as soon as possible.

65. The motor applied in Blowers and Fans is ?

A) D.C. Series motor
B) D.C. Shunt motor
C) D.C Differential compound motor
D) None of theses

... Answer is B)
Explanation will provide as soon as possible.

66. The D.C motor having the high starting Torque is ?

A) Series motor
B) Shunt motor
C) Differential compound motor
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

67. Which of the following is an AC motor ?

A) Synchronous motor
B) Slip-ring motor
C) Squirrel cage Induction motor
D) All options are correct

... Answer is D)
Explanation will provide as soon as possible.

68. Which of the following information available on name plate of a motor ?

A) R.P.M
B) HP rating
C) Frame model
D) All options are correct

... Answer is D)
Explanation will provide as soon as possible.

69. Electronic soft starters are used for motors to ?

A) Achieve variable speed
B) Provide smooth start and stop
C) Improve the loading
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

70. What is the unit of mesure for electrical pressure or electromotive force ?

A) Volt
B) Amperes
C) ohm
D) Watt

... Answer is A)
Explanation will provide as soon as possible.

71. Which of the following circuit configurations has the same amount of voltage drop across each of its components ?

A) series-parallel connnection
B) series connection
C) parallel connection
D) All options are correct

... Answer is C)
Explanation will provide as soon as possible.

72. What is the term used to describe the ability of a device to store energy in the form of an electrical charge ?

A) conductance
B) inductance
C) reactance
D) capacitance

... Answer is D)
Explanation will provide as soon as possible.

73. In mutual induction, what passes between conductors in order to create voltage ?

A) magnetic flux
B) resistance
C) radiation
D) current flow

... Answer is A)
Explanation will provide as soon as possible.

74. Henry' is the unit of measurement for which of the following properties ?

A) reactance
B) inductance
C) capacitance
D) resistance

... Answer is B)
Explanation will provide as soon as possible.

75. Which of the follwing is an appropriate use for a voltmeter ?

A) The measurement of electric current flow
B) The determination of total resistance
C) The measurement of difference of potential
D) The determination of power output

... Answer is C)
Explanation will provide as soon as possible.

76. What should be observed when connecting a voltmeter into a DC circuit ?

A) Polarity
B) Power factor
C) RMS
D) Resistance

... Answer is A)
Explanation will provide as soon as possible.

77. The speed of an AC motor depends on ?

A) Both frequency and number of poles
B) Number of poles only
C) Frequency only
D) None of these

... Answer is A)
Explanation will provide as soon as possible.

78. The basic shift register operation is ?

A) parallel in serial out
B) serial in parallel out
C) serial in serial out
D) All options are correct

... Answer is C)
Explanation will provide as soon as possible.

79. Two blocks G1(s) and G2(s) can be cascaded to get resultant transfer function as ?

A) G1(s)/G2(s)
B) G1(s)+G2(s)
C) 1+G1(s)G2(s)
D) G1(s).G2(s)

... Answer is B)
Explanation will provide as soon as possible.

80. The standard 2-input TTL gate for the below shown electrical symbol is ?

A) 7400
B) 7402
C) 7410
D) 7500

... Answer is A)
Explanation will provide as soon as possible.

81. Fermi energy level for p-type extrinsic semiconductors lies ?

A) Close to conduction band
B) At middle of the band gap
C) Close to valence band
D) None of these

... Answer is C)
Explanation will provide as soon as possible.

82. _is the dominant form of distortion produced by the simple push-pull amplifier ?

A) Harmonic Distortion
B) Clipping
C) Clamping
D) Crossover distortion

... Answer is D)
Explanation will provide as soon as possible.

83. The average voltage at the output of FWR is ?

A) Vm/π
B) 2Vm/π
C) Vm/2
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

84. Transistor can be used to ?

A) Amplify current
B) Amplify voltage
C) Amplify power
D) All options are correct

... Answer is D)
Explanation will provide as soon as possible.

85. _consists of two plates separated by a dielectric and can store charge ?

A) Capacitor
B) Transistor
C) Inductor
D) Relay

... Answer is A)
Explanation will provide as soon as possible.

86. Consider a single crystal of an intrinsic semiconductor. The number of free carriers at the Fermi level at room temperature is ?

A) half the total number of electrons in the crystal
B) half the number of free electrons in the crystal
C) half the number of atoms in the crystal
D) zero

... Answer is B)
Explanation will provide as soon as possible.

87. A semiconductor is formed by_bonds ?

A) metallic
B) Ionic
C) Covalent
D) None of these

... Answer is C)
Explanation will provide as soon as possible.

88. β gain of the transistor signifies ?

A) Rectification capability of the transistor
B) Amplification capability of the transistor
C) Regulation capability
D) All options are correct

... Answer is B)
Explanation will provide as soon as possible.

89. High frequency and impulse currents are measured using ?

A) Hall and Faraday effect device
B) resistive shunt
C) inductive element
D) All options are correct

... Answer is D)
Explanation will provide as soon as possible.

90. The classical analogous of a simple lever is ?

A) Transformer
B) Capacitor bridge
C) Mutual inductor
D) None of these

... Answer is C)
Explanation will provide as soon as possible.

91. Fleming's left hand rule is used in ?

A) Generator
B) Motor
C) Transformer
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

92. The normal value of the armature resistance of a D.C motor is equal to ?

A) 0.005
B) 0.5
C) 10
D) 100

... Answer is B)
Explanation will provide as soon as possible.

93. In a D.C. generator commutator acts as a ?

A) Inverter
B) Collector
C) Rectifier
D) Short circuit

... Answer is C)
Explanation will provide as soon as possible.

94. If a 3 phase alternator is short circuited at its terminal, then the initial value of short circuit current will be limited by ?

A) Transient reactance
B) Shynchronous reactance
C) Sub transient reactance
D) None of these

... Answer is C)
Explanation will provide as soon as possible.

95. If the AC supply to transformer is replaced by DC ?

A) the transformer has no effect
B) the secondary winding will burn
C) the primary winding will burn
D) All options are correct

... Answer is C)
Explanation will provide as soon as possible.

96. The principle of operation of a 3-phase induction motor is most similar to that of a ?

A) Transformer with a shorted secondary
B) Synchronous motor
C) Repulsion-start induction motor
D) Capacitor-start, induction-run motor

... Answer is A)
Explanation will provide as soon as possible.

97. Alternators are classified into ?

A) Slip-ring & squirrel cage
B) Self-starting & separately staritng
C) Salient pole & non-salient
D) None of these

... Answer is C)
Explanation will provide as soon as possible.

98. According to Lenz's law, the induced e.m.f sets up a current in which direction ?

A) Direction of gravity
B) Direction, opposite of cause producing it
C) Same direction of cause produting it
D) None of these

... Answer is B)
Explanation will provide as soon as possible.

99. According to Fleming's right hand rule the thumb shows ?

A) Direction of flux
B) Direction of current
C) Direction of motion
D) Direction of gravity

... Answer is C)
Explanation will provide as soon as possible.

100. In a pure capacitive circuit ?

A) the current lags applied voltage by 90 degree
B) the current is in phase with applied voltage
C) the current leads applied voltage by 90 degree
D) None of these

... Answer is C)
Explanation will provide as soon as possible.