ECET EEE Model Paper 3

1. Laminations are used in armature of D.C. machine to

A. Reduce weight
B. Reduce volume
C. Reduce eddy current loss
D. Increase air movement

Answer : C. Reduce eddy current loss
Explanation:-

2. Variable resistors are

A. Wire wound resistors
B. Thin film resistors
C. Thick film resistors
D. All the above

Answer : A. Wire wound resistors
Explanation:-

3. Trickle charge is required for

A. Lead acid batteries
B. Nickel iron cells
C. Secondary
D. All of the above

Answer : D. All of the above
Explanation:-

4. In nickel-iron cell the electrolyte is

A. Dilute sulfuric acid
B. Dilute potassium hydroxide
C. Dilute ammonium hydroxide
D. Dilute sodium chloride solution

Answer :B. Dilute potassium hydroxide
Explanation:-

5. In a D.C. series motor, shaft torque is less than the armature torque due to

A. Stray losses
B. Eddy current losses
C. Hystoresis losses
D. All of the above

Answer : A. Stray losses
Explanation:-

6. Mica belongs to which class of insulation

A. A
B. E
C. F
D. H

Answer : D. H
Explanation:-

7. Hopkinson’s test is conducted at

A. Full load
B. Part load
C. Low load
D. No load

Answer : A. Full load
Explanation:-

8. The unit of flux density is

A. Webers/m²
B. Henry/ m²
C. Newton/ m²
D. Ampere/ m²

Answer : A. Webers/m²
Explanation:-

9. The reciprocal of reluctance is

A. Susceptibility
B. Permeability
C. Permeance
D. Reluctivity

Answer : C. Permeance
Explanation:-

10. Ohm’s law is not applicable to

A. D.C. circuits
B. High currents
C. Small resistors
D. Semi-conductors

Answer : D. Semi-conductors
Explanation:-

11. Di-electric strength of a material depends on

A. Thickness
B. Temperature
C. Moisture content
D. All of the above

Answer : D. All of the above
Explanation:-

12. For a six pole wave wound dc generator the number of brushes will be

A. 12
B. 6
C. 4
D. 2

Answer : B. 6
Explanation:-

13. The unit relative permeability

A. Henry
B. Henry/m
C. Henry/square meter
D. It is dimensionless

Answer : D. It is dimensionless
Explanation:-

14. In two wattmeter method, if one of the wattmeter shows negative reading, the factor of the load should be

A. Unity
B. Lagging
C. Leading
D. Zero

Answer : B. Lagging
Explanation:-

15. The area of hysteresis loop is a measure of

A. Permeance
B. Magnetic flux
C. Energy loss per cycle
D. Permittivity

Answer : C. Energy loss per cycle
Explanation:-

16. The critical resistance of the dc generator refers to the resistance of

A. Armature
B. Load
C. Field
D. Brushes

Answer : A. Armature
Explanation:-

17. A transformer can have no zero voltage regulation at

A. Zero power factor
B. Lagging power factor
C. Leading power factor
D. Unity power factor

Answer : C. Leading power factor
Explanation:-

18. In scott connections the main transformer has centre tap on

A. Primary winding
B. Secondary winding
C. Both A and B
D. None of the above

Answer :C. Both A and B
Explanation:-

19. Piezo electric transducers are

A. Active transducers
B. Passive transducers
C. Secondary transducers
D. None of the above

Answer :A. Active transducers
Explanation:-

20. Over currents in transformer affects

A. Insulation life
B. Temperature rise
C. Mechanical stress
D. All of the above

Answer : D. All of the above
Explanation:-

21. As the speed of an alternator increases

A. The frequency increases
B. The frequency decreases
C. The frequency remains same but power factor decreases
D. None of the above

Answer : A. The frequency increases
Explanation:-

22. For 50hz system the maximum speed of an alternator can be

A. Approximately 3600 rpm
B. 3600 rpm
C. Approximately 3000 rpm
D. 3000 rpm

Answer : D. 3000 rpm
Explanation:-

23. Which voltmeter has the least power consumption

A. Induction type
B. Hot wire type
C. Electrostatic type
D. Moving iron- attraction type

Answer :C. Electrostatic type
Explanation:-

24. Which of the following primary transducer does not convert velocity to pressure

A. Orifice
B. Venture
C. Pilot tube
D. Varies

Answer : D. Varies
Explanation:-

25. In A.C. circuits, the meters measure

A. r.m.s values
B. Peak values
C. Mean values
D.Mean square values

Answer : A. r.m.s values
Explanation:-

26. Incandescent bulb can work on

A. A.C. only
B. D.C. only
C. Both dc as well as ac
D. Depend on the shape of the coil

Answer : C. Both dc as well as ac
Explanation:-

27. An inductor

A. Allows ac to pass but blocks dc
B. Allows dc to pass but blocks ac
C. Allows both ac and dc to pass
D. Blocks dc

Answer :C. Allows both ac and dc to pass
Explanation:-

28. Buchholz realy is generally not provided on transformers below

A. 1kVA
B. 5kVA
C. 50kVA
D. 500kVA

Answer : D. 500kVA
Explanation:-

29. An ideal current source has zero

A. Internal conductance
B. Internal resistance
C. Voltage no load
D. Ripple

Answer :B. Internal resistance
Explanation:-

30. An inductor stores energy in

A. Electrostatic field
B. Electromagnetic field
C. Core
D. Magnetic field

Answer : D. Magnetic field
Explanation:-

31. The efficiency of a transformer at full load 0.85 PF lag is 90%. Its efficiency at full load 0.85 PF lead is

A. Less than 90%
B. More than 90%
C. 90%
D. 100%

Answer : C. 90%
Explanation:-

32. The permissible pH value of water for boilers is

A. 1
B. 7
C. Slightly more than 7
D. 10

Answer : C. Slightly more than 7
Explanation:-

33. A nuclear power plant is invariably used as a

A. Base load plant
B. Peak load plant
C. Stand by plant
D. Spinning reverse plant

Answer : A. Base load plant
Explanation:-

34. In induction motors, the rotor slots are skewed to reduce

A. Noise
B. Vibrations
C. Magnetic humming
D. Magnetizing current

Answer : D. Magnetizing current
Explanation:-

35. Hunting in a synchronous motor cannot be due to

A. Variable load
B. Variable frequency
C. Variable supply voltage
D. Windage friction

Answer :D. Windage friction
Explanation:-

36. The disadvantage of renewable source of energy is

A. Lack of dependability
B. Intermittency
C. Availability of low energy densities
D. All f the above

Answer : D. All f the above
Explanation:-

37. Reluctance motors are

A. Doubly excited
B. Singly excited
C. Multiply excited
D. Unexcited

Answer :B. Singly excited
Explanation:-

38. In double cage induction motor the inner cage has

A. High R and high X
B. High R and low X
C. Low R and high X
D. Low R and low X

Answer : C. Low R and high X
Explanation:-

39. Two alternators are running in parallel. If the field of one of the alternator is adjusted, it will

A. Reduce its speed
B. Change its load
C. Change its power factor
D. Change its frequency

Answer :C. Change its power factor
Explanation:-

40. A 4 pole, 3 phase, 50hz induction motor running at 1450 rpm will have percentage slip of

A. 103.3%
B. 4%
C. 7.5%
D. 8%

Answer : A. 103.3%
Explanation:-

41. Power factor is given by

A. Kwh/kw
B. Active power/reactive power
C. Reactive power/active power
D. Kw/kwh

Answer : B. Active power/reactive power
Explanation:-

42. For the same plant size, initial cost of which plant is the highest

A. Steam power plant
B. Diesel engine plant
C. Nuclear power plant
D. Gas turbine plant

Answer : C. Nuclear power plant
Explanation:-

43. The speed regulation of a 3 phase synchronous motor is

A. 5%
B. 1%
C. 0.4%
D. Zero

Answer : D. Zero
Explanation:-

44. The overall thermal efficiency of a steam power station in the range of

A. 18-24%
B. 30-40%
C. 44-62%
D. 68-79%

Answer : A. 18-24%
Explanation:-

45. The number of slip rings on a squirrel cage induction motor the

A. 1
B. 3
C. 6
D. None

Answer : D. None
Explanation:-

46. The sag of the transmission line is least affected by

A. Self weight conductors
B. Temperature of surrounding air
C. Current through conductor
D. Ice deposited on conductor

Answer : C. Current through conductor
Explanation:-

47. Which of the following is a conducting medium for electric current

A. Low temperature gas
B. high temperature gas
C. Dissociated gas
D. Plasma

Answer : D. Plasma
Explanation:-

48. The disadvantages with paper as insulating material is

A. It has low insulation resistivity
B. It has high capacitance
C. It is hygroscopic
D. It is organic material

Answer : C. It is hygroscopic
Explanation:-

49. A zero watt lamp consumes

A. No power
B. About 5 to 7 w power
C. About 15 to 20 w power
D. About 25 to 30 w power

Answer :B. About 5 to 7 w power
Explanation:-

50. The main advantage of A.C. transmission system over D.C. transmission system is

A. Easy transformation
B. Less losses in transmission over long distances
C. Less insulation problems
D. Less problem of instability

Answer : B. Less losses in transmission over long distances
Explanation:-

51. Di-electric strength of SF6 IS

A. Less than that of air at atmospheric pressure
B. Less than that of oil used in OCB
C. More than that of oil used in OCB
D. More at low pressure and low at higher pressure

Answer : B. Less than that of oil used in OCB
Explanation:-

52. Buchholz relay is operated by

A. Eddy currents
B. Gas pressure
C. Electromagnetic induction
D. Electro static induction

Answer : B. Gas pressure
Explanation:-

53. The size of the conductor of power cables depends on

A. Type of insulation
B. Current
C. Voltage
D. Power factor

Answer : B. Current
Explanation:-

54. When maximum and average loads are equal, the load factor will be

A. Zero
B. 0.01
C. 0.5
D. 1.0

Answer :D. 1.0
Explanation:-

55. If the resistance of dry skin of human body is 1,00,000 ohms, the resistance of the wet body will be

A. 1,00,000 ohms
B. 2,00,000 ohms
C. 5,00,000 ohms
D. 5000 ohms

Answer : D. 5000 ohms
Explanation:-

56. Highest voltage for transmitting electrical power in india is

A. 735 kV
B. 700 kV
C. 550 kV
D. 400 kV

Answer : D. 400 kV
Explanation:-

57. Load curve helps in deciding

A. Sizes of the generation units
B. total installed capacity of the planet
C. operating schedule of generating units
D. all of the above

Answer :D. all of the above
Explanation:-

58. Which of the following relation is incorrect

A. Capacity factor=utilization factor x load factor
B. Load factor x maximum load =average load
C. Demand factor x connected load=maximum demand
D. None of the above

Answer :D. None of the above
Explanation:-

59. The current drawn by the line due to corona loses is

A. Sinusoidal
B. Square
C. Non sinusoidal
D. Triangular

Answer : C. Non sinusoidal
Explanation:-

60. Skin effect depends on

A. Size of the conductor
B. Frequency of the current
C. Resistivity of the conductor material
D. All of the above

Answer : D. All of the above
Explanation:-

61. Power frequency of 25 kV single phase system is

A. 32/3
B. 25
C. 50
D. 60

Answer :C. 50
Explanation:-

62. Lumen/watt is the unit of

A. Light flux
B. Luminious intensity
C. Brightness
D. Luminious efficiency

Answer : D. Luminious efficiency
Explanation:-

63. The co efficient of adhesion is highest when

A. The rails are dry
B. The rails are oiled
C. The rails are wet with dew
D. The rails are dusty

Answer : A. The rails are dry
Explanation:-

64. Human eye can be considered as

A. An open lop system
B. A closed loop system with single feed back
C. A closed system with multivariable feedback
D. None of the above

Answer :C. A closed system with multivariable feedback
Explanation:-

65. Highest power factor can be expected in which method of heating

A. Electric arc heating
B. Di electric heating
C. Induction heating
D. Resistance heating

Answer : D. Resistance heating
Explanation:-

66. According to Indian electricity rules, extra high voltage implies voltage exceeding

A. 440 v
B. 650 v
C. 33 kV
D. 110 kV

Answer : C. 33 kV
Explanation:-

67. Dranger 440 v plates are

A. Danger notices
B. Caution notices
C. Advisory notices
D. Informal notices

Answer : B. Caution notices
Explanation:-

68. Stator voltage control for speed control of induction motors are suitable for

A. Fan and pump drives
B. Drive of a crane
C. Running it as generator
D. Constant load drive

Answer : A. Fan and pump drives
Explanation:-

69. A two phase induction motor consists of

A. Two stator windings
B. Two rotor windings
C. Both A and B
D. None of the above

Answer :A. Two stator windings
Explanation:-

70. Halogen lamps are used for the illumination of

A. Sports grounds
B. Parks
C. Air ports
D. All of the above

Answer :D. All of the above
Explanation:-

71. For tramways the return circuit is

A. Through cables
B. Through rails
C. Through neutral wire
D. Through common earthing

Answer : B. Through rails
Explanation:-

72. In a domestic cake baking oven the temperature is controlled by

A. Series parallel operation
B. Auto transformer
C. Thermostat
D. Voltage variation

Answer : C. Thermostat
Explanation:-

73. Which of the following is of high value in case of induction heating

A. Voltage
B. Current
C. Frequency
D. All of the above

Answer : C. Frequency
Explanation:-

74. The earthing electrode should be suited at a place at least …………………meter away from the building whose installation system is being earthed

A. 1.5 m
B. 103.5 m
C. 25 m
D. 100 m

Answer : A. 1.5 m
Explanation:-

75. Oscillators are widely used in

A. Radio broadcasting
B. Television broadcasting
C. Radio and television receivers
D. All of the above

Answer :D. All of the above
Explanation:-

76. A device that converts from decimal to binary numbered is called

A. Decoder
B. Encoder
C. CPU
D. Converter

Answer : B. Encoder
Explanation:-

77. For good stability the tuned circuit should have

A. High Q
B. Low R
C. Low L
D. Low C

Answer : A. High Q
Explanation:-

78. How many outputs are these in the output of a 10 bit D/A converter

A. 1000
B. 1023
C. 1024
D. 1224

Answer : B. 1023
Explanation:-

79. Which of the following device incorporate a terminal for synchronizing purposes

A. DIAC
B. TRAIC
C. SUS
D. None of the above

Answer : C. SUS
Explanation:-

80. In general the gain of amplifier is

A. Real
B. Imaginary
C. Complex
D. None of the above

Answer : C. Complex
Explanation:-

81. Checking on transformer oil level can be done

A. Daily
B. Monthly
C. Quarterly
D. Yearly

Answer : B. Monthly
Explanation:-

82. Transformer capacity is expressed in

A. kW
B. kVA
C. kV
D. kVAR

Answer : B. kVA
Explanation:-

83. The forbidden energy gap between the valence band and conduction band will be wide in case of

A. Semi conductors
B. All metals
C. Good conductors of electricity
D. Insulators

Answer : D. Insulators
Explanation:-

84. Which of the following wire is used service mains

A. Cleat wiring
B. T.R.S wiring
C. Lead sheathed wiring
D. Wooden casing and capping wiring

Answer :C. Lead sheathed wiring
Explanation:-

85. For all substations which type of earthing is preferred

A. Pipe earthing
B. Plate earthing
C. Rod earthing
D. Strip/wire earthing

Answer : B. Plate earthing
Explanation:-

86. In a transistor which of the following region is very lightly doped and is very thin

A. Emitter
B. Base
C. Collector
D. None of the above

Answer : B. Base
Explanation:-

87. In Boolean algebra A+A+A+…………..+A is same as

A. 5A
B. nA
C. A
D. Infinity

Answer : C. A
Explanation:-

88. A device that does not exhibit negative resistance characteristic is

A. FET
B. UJT
C. Tunnel diode
D. SCR

Answer : A. FET
Explanation:-

89. Status register in the 8156 is read with

A. IN20H
B. OUT 20H
C. Either A or B
D. None of the above

Answer : A. IN20H
Explanation:-

90. Soft magnetic materials are widely used in

A. Meters
B. Transducers
C. Transformer cores
D. Televisions

Answer : C. Transformer cores
Explanation:-

91. Status register in 815 contains information about

A. The timer
B. The ports
C. Both A and B
D. None of the above

Answer : C. Both A and B
Explanation:-

92. In 8355 , the ROM is organized as……… words of 8 bit each

A. 2000
B. 2048
C. 4048
D. 8355

Answer : B. 2048
Explanation:-

93. RC snubber circuit is used to limit the rate of

A. Rise of current in SCR
B. Rise of voltage across SCR
C. Conduction period
D. All of the above

Answer : C. Conduction period
Explanation:-

94. If the firing angle in a SCR rectifier is decreased output is

A. Increased
B. Maximum
C. Decreased
D. Unaffected

Answer : A. Increased
Explanation:-

95. Synchronous motors are generally not self-starting because

A. the direction of rotation is not fixed
B. the direction of instantaneous torque reverses after half cycle
C. starters cannot be used on these machines
D. starting winding is not provided on the machines

Answer : B. the direction of instantaneous torque reverses after half cycle
Explanation:-

96. A pony motor is basically a

A. small induction motor
B. D.C. series motor
C. D.C. shunt motor
D. double winding A.C./D.C. motor

Answer : A. small induction motor
Explanation:-

97. The power developed by a synchronous motor will be maximum when the load angle is

A. 0
B. 45 deg
C. 90 deg
D. 120 deg

Answer :C. 90 deg
Explanation:-

98. Mostly, synchronous motors are of

A. alternator type machines
B. induction type machines
C. salient pole type machines
D. smooth cylindrical type machines

Answer : C. salient pole type machines
Explanation:-

99. A NAND gate is called a universal logic element because

A. it is used by everybody
B. any logic function can be realized by NAND gates alone
C. all the minization techniques are applicable for optimum NAND gate realization
D. many digital computers use NAND gates

Answer : B. any logic function can be realized by NAND gates alone
Explanation:-

100. Excess-3 code is known as

A. Weighted code
B. Cyclic redundancy code
C. Self-complementing code
D. Algebraic code

Answer : C. Self-complementing code
Explanation:-