51. A 230V, 100W bulb has resistance R_{A} and 230V, 200W bulb has resistance R_{B}, then,

- R
_{A }= 4R_{B} - R
_{A}=R_{B} - R
_{A}>R_{B} - R
_{A}<R_{B}

52. Unit of magnetic flux is

- Weber
- Ampere-turn
- Tesla
- Coulomb

53. A 50 Hz alternator will run at the greatest possible speed if it is wound for _____ poles.

- 6
- 4
- 2
- 8

54. Meggar is used to measure

- Harmonics
- Frequency
- Voltage
- Insulation resistance

55. Bridge used for measurement of capacitance is

- Anderson’s bridge
- Hay’s bridge
- Schering bridge
- Max well’s bridge

56. Best conductor amongst the following is

- Porcelain
- China clay
- Graphite
- None of these

57. Negative sequence relay is used in

- Feeder
- Transformer
- Generator
- Long overhead line

58. Stepper motor is used in

- Cassette motor is used in
- Ceiling fan
- Hand drills
- Digital control system

59. Forward resistance of a crystal diode is of the order of

- Ω
- kΩ
- MΩ
- Zero Ω

60. Transformer is required for the operation of

- Half –wave rectifier
- Bridge rectifier
- Centre-tap rectifier
- Both (1) and (2)

61. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about

- 100:1
- 1000:1
- 40000:1
- 1:1

62. In a transistor reversed biosed pn junction has a resistance of the

- Order of Ω
- Order of kΩ
- Order of MΩ
- Zero Ω

63. Valence electrons in a pentavalent impurity are

- 4
- 2
- 5
- 6

64. Which of the following transformers is smallest?

- 1KVA, 50Hz
- 1KVA, 200Hz
- 1KVA, 400Hz
- 1KVA, 600Hz

65. The characteristic impedance of a loss less transmission line is given by

- √LC
- √L/C
- 1√LC
- √C/L

66. What does the SCR (short circuit ratio) of a synchronous machine yield?

- 1/X
_{S}( unsaturated ) pu - 1/X
_{S}( unsaturated ) ohm - 1/X
_{S}( adjusted ) pu - 1/X
_{S}( adjusted ) in ohm

67. The spectral density of pink noise varies as

- 1/f
^{2} - F
^{2} - 1/f
- F

68. Electrostatic instruments are not free from the effect of

- Frequency
- Stray magnetic field
- Stray electrostatic field
- Temperature

69. Methods not used for measurement of medium resistance is

- Kelvin double bridge
- Ammeter-voltmeter method
- Substitution method
- Wheatstone bridge

70. For a given frequency the deflecting torque of an induction ammeter is directly proportional to

- Current
^{2} - Current
^{3} - √current
- Current

71. Which plant can never have 100% load factor

- Nuclear power plant
- Hydroelectric plant
- Peak load plant
- Base load plant

72. Which plant has the minimum running cost?

- Nuclear power plant
- Hydro electric plant
- Diesel plant
- Thermal plant

73. For the transient stability of a power system

- dδ/dt>0 , dp/ds>0
- dδ/dt=0 , dp/ds>0
- dδ/dt<0 , dp/ds<0
- dδ/dt<0 , dp/ds=0

74. DC voltage of the order of a few m V can be measured accurately using a

- Moving coil voltmeter
- Null-balanced potentio-meter
- Moving iron voltmeter
- Electrostatic voltmeter

75. An advantage with a VTVM over a non-electronic voltmeter is

- Lower power consumption
- Lower input impedance
- The ability to measure wider ranges of voltage and resistance
- Greater probability

76. Distances relay measures.

- Current difference
- Voltage difference
- Impedance difference
- Distance between two CTs.

77. Calculate the velocity of random thermal motion of electron at room temp.(300k)

- 17 10
^{5}m/sec - 17 10
^{5}m/sec - 17 10
^{5 }m/sec - 17 10
^{5}m/sec

78. The p.u. parameters for a 500 MVA machine on its own base are:

Inertia, M= 20 p.u.; reactance, X=2 p.u.

The p.u. values of inertia and reactance or 100 MVA base, respectively, are

- 4, 0.4
- 100, 10
- 4, 10
- 100, 0.4

79. The value of R for which the PMOS transistor in figure will be biased in linear region is

- 220 Ω
- 470Ω
- 680Ω
- 1200Ω

80. An intrinsic semiconductor at absolute zero temperature

- How a large number of holes
- Acts as conductor
- Acts as insulator
- Has a few holes and a few free electrons.

Junior Engineer [Electrical] – Test Series 2018 – Buy Now

81. An electromagnetic field is said to be conservative when

- ∇
^{2}E = με - ∇
^{2}H = με - Curl of the field zero
- Divergence of the field is zero

82. The damping torque is produced by

- Gravity control
- Eddy currents
- Spring control
- Utilizing thermal effects

83. DC current cannot be measured directly by

- Induction ammeter
- Thermal ammeter
- Ballislic galvanometer
- Electrodynamics ammeter

84. In the ac bridge shown in the figure

*The value of unknown impendence z _{4} at balance is*

- (300 + j100) ohm
- (100 + j150) ohm
- ( 0 + j150 ) ohm
- ( 100 – j150 ) ohm

85. Consider the following statement in respect of IGBT:

1) It combines the attributes of MOSFET and BJT

2) It has low forward voltage drop.

3) Its switching speed is very much lower

4) It has high input impedance

*Which of the statements given above are correct?*

- 1,2,3 and 4
- 1,2 and 4 only
- 1,2 and 3 only
- 3 and 4 only

86. The sensitivity of a voltmeter using 0 to 5mA meter movement is

- 200 ohm/volt
- 500 ohm/volt
- 100 ohm/volt
- 50 ohm/volt

87. The phenomenon of creeping occurs in

- Voltmeters
- Wattmeter
- Energy meters
- Ammeters

88. The starting torque of a capacitor start motor is

- Zero
- Low
- Same as rated torque
- Same as 3 phase induction motor

89. Which single phase a.c. motor will you select for record-players ad tape-recorders?

- Hysteresis motor
- Shaded pole motor
- Reluctance motor
- Two value capacitor motor

90. Thevenin’s equivalent circuit consists of

- Series combination of R
_{Th}, E_{th }and R_{L} - E
_{Th }and R_{Th }in series - E
_{Th }and R_{Th }in parallel - Parallel combination of R
_{Th}, E_{th }and R_{L}

91. Why is a ring main distribution system preferred to a radial system?

a. Voltage drop in the feeder is less

b. Power factor is higher

c. Supply is more reliable

*Select the correct using the code given below:*

- a and b only
- b and c only
- a and c only
- a,b and c

92. In ac connected circuits the product of voltage and current is known as:

- Power
- Real power
- Resistive power
- Apparent power

93. Two wattmeter connected to measure the power in a balanced 3ф load will indicate same reading when load p.f. is

- Zero
- Unity
- 5
- None of these

94. Norton’s theorem is

- The same as Thevenin’s theorem
- Converse of Thevenin’s theorem
- Cannot say
- Same as Newton’s theorem

95. The relative permittivity is

- Dielectric constant
- Dielectric strength
- Potential gradient
- None of these

96. The current flow through the solution of an electrolyte is carried by

- Free electrons
- Molecules
- Ions
- Atoms

97. In an R-L series circuit, line current

- Leads the applied voltage
- Zero
- Lags behind the applied voltage
- infinity

98. In star connected supply system

- Line current is equal to phase current
- Two voltages are used
- Phase sequence can be easily changed
- It is simple system

99. Shunt are generally made of

- Zinc
- Copper
- Gold
- Manganin

100. The d. c. motor equation is

- V=E
_{b}+ I_{a }R_{a} - E
_{b}=V +I_{a }R_{a} - V =E
_{b}– I_{a }R_{a} - E
_{b}=0

Junior Engineer [Electrical] – Test Series 2018 – Buy Now

**Read more: ॥ Part-3 ॥ Part-1 ॥ **

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