ECET EEE Model Paper 2

1. In series type ohm meter , full scale deflection current indicator is marked

A. zero
B. infinite
C. 100w
D. 1MW

Answer : A. zero
Explanation:-

2. On changing the speed of an alternator from 4000 rpm to 2000 rpm the generated emf/ph will come

A. 1/4
B. 1/2
C. 1/3
D. 1/5

Answer : B. 1/2
Explanation:-

3. Semiconductor strain gauge have

A. Low fatigue life
B. High gauge factor
C. Complete linearly
D. Poor hysteresis characteristics

Answer : B. High gauge factor
Explanation:-

4. The break down torque of a synchronous motor varies as

A. 1/ (applied voltage)
B. 1/ (applied voltage)^2
C. Applied voltage
D. (applied voltage)^2

Answer :C. Applied voltage
Explanation:-

5. In gravity control, control torque is a function of angular deflection q as

A. Cos q
B. Sin q
C. Tan q
D. Cot q

Answer : B. Sin q
Explanation:-

6. In terms of slip ‘S’ the ratio of rotor copper loss to rotor input is

A. s
B. (1-s)
C. 1/s
D. 1/(1-s)

Answer : A. s
Explanation:-

7. For parallel operation, alternators must have

A. same speed
B. same KVA rating
C. same voltage rating
D. none of the above

Answer : D. none of the above
Explanation:-

8. The maximum current that can be supplied by an alternator depends on

A. speed of exciter
B. number of poles
C. exciter current
D. strength of the magnetic field

Answer : A. speed of exciter
Explanation:-

9. Which of the following method s can be used for speed control of an induction motor

A. Pole changing
B. Change of frequency
C. Cascade control
D. Any of the above

Answer : D. Any of the above
Explanation:-

10. A delta circuit has each element of value R/2. The equivalent elements of star circuit will be

A. 2R
B. 6R
C. 3/2R
D. R/6

Answer : C. 3/2R
Explanation:-

11. The heat sink disposes off heat mainly by

A. Radiation
B. Natural convection
C. Forced convection
D. Conduction

Answer : B. Natural convection
Explanation:-

12. The hardest natural substance is

A. Tungsten
B. Gold
C. Platinum
D. Diamond

Answer : D. Diamond
Explanation:-

13. The melting point of carbon is around

A. 1800°c
B. 2150°c
C. 3500°c
D. 5500°c

Answer : C. 3500°c
Explanation:-

14. For an ideal noise free transistor amplifier the noise factor is

A. Zero
B. Zero dB
C. 1dB
D. Depends on the factor

Answer : B. Zero dB
Explanation:-

15. Force between two charges particles is proportional to

A. Inverse of distance
B. Inverse of square of distance
C. Inverse of cube of distance
D. None of the above

Answer : B. Inverse of square of distance
Explanation:-

16. 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:-

17. In a capacitor, the electric charge is stored in

A. Di electric
B. Metal plates
C. Di electric as well as metal plates
D. Neither Di electric nor metal plates

Answer : A. Di electric
Explanation:-

18. The speed control of a cumulatively compounded dc motor can be affected thorough

A. Change of armature resistance
B. Change of armature voltage
C. Change of armature impedance
D. None of the above

Answer :D. None of the above
Explanation:-

19. In which of the following meters will require the smallest shunt resistance

A. 0-20mA
B. 0-100mA
C. 0-1mA
D. 0-10mA

Answer :D. 0-10mA
Explanation:-

20. The area of hysteresis loop is a measure of

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

Answer : C. Energy loss/cycle
Explanation:-

21. Equalizer rings in lap wound would dc generators are used to

A. Provide mechanical balance
B. Reduce load on bearing
C. Avoid noise developed in the machine
D. Avoid unequal distribution of current at the brushes thereby helping to get sparkles communication

Answer : D. Avoid unequal distribution of current at the brushes thereby helping to get sparkles communication
Explanation:-

22. The critical resistance of the D.C. generator refers to the resistance of

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

Answer : A. Armature
Explanation:-

23. The power rating of a 470 W resistor carrying a current of 40mA should be

A. 1/4W
B. 1/2W
C. 1W
D. 2W

Answer :C. 1W
Explanation:-

24. In case of uniformly distributed winding the value of distribution factor is

A. 0.995
B. 0.80
C. 0.75
D. 0.50

Answer : A. 0.995
Explanation:-

25. The slip of an induction motor in practical cases

A. 10%
B. 3 to 5%
C. 10 to 20%
D. 15 to 20%

Answer : B. 3 to 5%
Explanation:-

26. The path of the magnetic flux in a transformer should have

A. Low reluctance
B. Low resistance
C. High reluctance
D. High resistance

Answer : C. High reluctance
Explanation:-

27. Boosters are basically

A. Inductors
B. capacitors
C. transformers
D. synchronous motors

Answer :D. synchronous motors
Explanation:-

28. In a transformer, the copper loss at half load as compared to that at full load will be

A. 4 times
B. 2 times
C. half
D. one fourth

Answer : D. one fourth
Explanation:-

29. In case of underground cables, the stress is maximum at

A. Surface of the cable
B. Surface of the conductor
C. Centre of the conductor
D. The interface of sheath and the conductor

Answer :D. The interface of sheath and the conductor
Explanation:-

30. In scott connection the neutral point divides the winding of the teaser transformer in the ratio of

A. 1:1
B. 1:2
C. 1:3
D. 1:4

Answer : B. 1:2
Explanation:-

31. The size of the power cables depends on

A. type of insulation
B. current
C. voltage
D. power factor

Answer : B. current
Explanation:-

32. The harmonic currents in transformer increase all of the following except

A. Copper loss
B. Core loss
C. Magnetic interference with protective relays
D. Secondary voltages

Answer : D. Secondary voltages
Explanation:-

33. If the selling fan when switched on runs at slow speed in the reverse direction, it can be concluded that

A. Winding has burnt out
B. Bearing are worn out
C. Capacitor is in effective
D. None of the above

Answer : C. Capacitor is in effective
Explanation:-

34. The overall efficiency of a boiler in a thermal power plant is the order of

A. 10%
B. 25 to 30%
C. 40 to 50%
D. 70 to 80%

Answer : D. 70 to 80%
Explanation:-

35. A scott connected transformer cannot paralleled with a

A. V-V transformer
B. Y-V transformer
C. D-D transformer
D. Y-Y transformer

Answer :B. Y-V transformer
Explanation:-

36. Polar dielectric is normally used for

A. High frequencies
B. Micro waves
C. Dc and power frequencies
D. None of the above

Answer : C. Dc and power frequencies
Explanation:-

37. In a over head transmission lines the effect of capacitance can be neglected when the length of line is less than

A. 200 km
B. 160 km
C. 100 km
D. 80 km

Answer :D. 80 km
Explanation:-

38. Large capacity generators are manufactured to generate power at

A. 440v
B. 6.3 to 10.5 kV
C. 132 kV to 220 kV
D. 400 kV

Answer : B. 6.3 to 10.5 kV
Explanation:-

39. The over voltage surges in power systems may be caused by

A. Lighting
B. Switching
C. Resonance
D. Any of the above

Answer :D. Any of the above
Explanation:-

40. A 3 phase, 5000 KVA, 6,6KV generator having 12% sub transient reatance. a 3 phase short circuit occurs at its terminals then fault MVA is

A. 21.5
B. 41.6
C. 53.33
D. 75.75

Answer : B. 41.6
Explanation:-

41. In a hydro electric plant a conduct system for taking water from the intake works to the turbine is known as

A. Dam
B. Reservoir
C. Penstock
D. Surge tank

Answer : D. Surge tank
Explanation:-

42. Breaking capacity of circuit breaker is usually expressed in terms of

A. Amperes
B. Volts
C. MW
D. MVA

Answer : D. MVA
Explanation:-

43. Kaplana turbine is

A. A high head mixed flow turbine
B. An impulse turbine, inward flow type
C. A reaction turbine, outward flow type
D. Low head axial flow turbine

Answer : D. Low head axial flow turbine
Explanation:-

44. A capacitor

A. Offers easy path to A.C. but blocks D.C.
B. Offers easy path to D.V. but blocks A.C.
C. Offers easy path to both A.C. and D.C.
D. Blocks A.C.

Answer : A. Offers easy path to A.C. but blocks D.C.
Explanation:-

45. Load curve is a plot of

A. Load versus generation capacity
B. Load versus current
C. Load versus time
D. Load versus cost of power

Answer : A. Load versus generation capacity
Explanation:-

46. An electric bulb rated 220V is connected to 220V .5 Hz source. Then the bulb

A. Does not glow
B. Glows intermittenty
C. Lows continuously
D. Fuses out bulb

Answer : B. Glows intermittenty
Explanation:-

47. which soil had the maximum specific resistance

A. Black cotton soil
B. Sand
C. Peat
D. Loamy soil

Answer : B. Sand
Explanation:-

48. Transformers contribute to radio interference due to

A. Corona discharge in air
B. Sparking
C. Internal or partial discharge in insulation
D. Any of the above

Answer : D. Any of the above
Explanation:-

49. Load sheding is done

A. To reduce heat demand
B. To improve power factor
C. To run the equipment efficiency
D. To repair the machine

Answer :A. To reduce heat demand
Explanation:-

50. A capacitive reactance of a 50uF capacitor connected to 1.5v,60Hz frequency system is

A. 0.53W
B. 5.3W
C. 53W
D. 530W

Answer : C. 53W
Explanation:-

51. The differential protection principle is used in the protection of

A. Generators
B. Transformers
C. Feeders
D. All of the above

Answer : D. All of the above
Explanation:-

52. Merz-price protection is used on

A. Substations
B. Circuit breakers
C. Transmission lines
D. Generators

Answer : B. Circuit breakers
Explanation:-

53. Which metal has highest electrical conductivity

A. Steel
B. Silver
C. Aluminium
D. Gold

Answer : D. Gold
Explanation:-

54. Power factor for pure conductor is

A. Unity
B. Zero
C. Infinite
D. 0.707

Answer :B. Zero
Explanation:-

55. Ordinary tramway is the most economical means of transport for

A. A very dense traffic of large cities
B. Medium traffic densities
C. Rural services
D. Sub-urban services

Answer : A. A very dense traffic of large cities
Explanation:-

56. A crystal oscillator is used because

A. It gives high output voltage
B. It works at high efficiency
C. The frequency of oscillations remains substantially constant
D. It requires very low dc supply voltage

Answer : C. The frequency of oscillations remains substantially constant
Explanation:-

57. In electrode positive welding……….of the total heat is produced at the electrode

A. One third
B. Two third
C. One fourth
D. Useful

Answer :B. Two third
Explanation:-

58. The binary number 101101 is equal to octal number

A. 65
B. 55
C. 51
D. 45

Answer :B. 55
Explanation:-

59. Overhead welding position is thought to be the most

A. Hazardous
B. Difficult
C. Economical
D. Useful

Answer : A. Hazardous
Explanation:-

60. Ultimate aim of using electrode coating is to

A. Providing shielding to weld pool
B. Prevent atmospheric contaminations
C. Improve head quality
D. Cleans the base metal

Answer : C. Improve head quality
Explanation:-

61. In 8085 TRAP is

A. Always maskable
B. Cannot interrupt a service sub routine
C. Used for catastrophic events like temporary power failure
D. Lowest priority interrupt

Answer :C. Used for catastrophic events like temporary power failure
Explanation:-

62. Floodlighting is not used for purpose

A. Reading
B. Aesthetic
C. Advertising
D. Industrial

Answer : A. Reading
Explanation:-

63. Normal working temperature of a filament in incandescent lamp

A. Upto 2000°c
B. Upto 1500°c
C. Upto 3000°c
D. Upto 2900°c

Answer : A. Upto 2000°c
Explanation:-

64. The motor commonly used in computers and digital system is

A. DC shunt motor
B. Induction motor
C. Stepper motor
D. Synchronous motor

Answer :C. Stepper motor
Explanation:-

65. The copper plate dimensions in plate earthing is

A. 60cm x 60cm
B. 60cm x 60cm x 3cm
C. 60cm x 60cm x 30cm
D. 60cm x 60cm x 2cm

Answer : B. 60cm x 60cm x 3cm
Explanation:-

66. Which of the following is best conductors of electricity

A. Cold water
B. Distilled water
C. Warm water
D. Salt water

Answer : D. Salt water
Explanation:-

67. If one cycle at ac waveform occurs every milli second, the frequency will be

A. 1/1000 Hg
B. 50 Hg
C. 100 Hg
D. 1000 Hg

Answer : D. 1000 Hg
Explanation:-

68. The value of earth resistance is

A. Voltage/current
B. Power/voltage
C. Voltage/cable size
D. Voltage/leakage current

Answer : D. Voltage/leakage current
Explanation:-

69. According to Indian electricity rules the medium voltage should not exceed

A. 250 volts
B. 500 volts
C. 33,000 volts
D. 650 volts

Answer :D. 650 volts
Explanation:-

70. The speed regulation of a synchronous motor

A. Unity
B. 1%
C. 0.1%
D. Zero

Answer :D. Zero
Explanation:-

71. Which of the following element has four valance electrons

A. Silicon
B. Antimony
C. Boran
D. Phosphrous

Answer : A. Silicon
Explanation:-

72. In case of low and medium voltage circuits, the permissible voltage variation is

A. 1%
B. 5%
C. 12.5%
D. 20%

Answer : B. 5%
Explanation:-

73. Which of the following is the fastest switching device

A. JFET
B. BJT
C. MOSFET
D. TRIODE

Answer : C. MOSFET
Explanation:-

74. Thyristor can be termed as

A. DC switch
B. AC Switch
C. both A and B
D. Square wave switch

Answer : A. DC switch
Explanation:-

75. The direct lighting scheme is most efficient but is liable to cause

A. Monotony
B. Glare
C. Hard shadows
D. Both A and C

Answer :D. Both A and C
Explanation:-

76. Low frequency response of amplifier is mainly limited by

A. Input capacitor
B. By pass capacitor
C. Output capacitor
D. Biasing capacitor

Answer : B. By pass capacitor
Explanation:-

77. In automobiles the sound is produced by horn due to

A. Magnetostiction
B. Vibrating diaphragm
C. Moving coil
D. Oscillating coil

Answer : B. Vibrating diaphragm
Explanation:-

78. The direct current system used for tramways has voltage of about…………..volts

A. 750
B. 1500
C. 3000
D. 2400

Answer : A. 750
Explanation:-

79. The speed/time curve for a city service train has no _______ period

A. coasting
B. free running
C. acceleration
D. braking

Answer : B. Free running
Explanation:-

80. A zener diode is invariably used with

A. forward bias
B. reverse bias
C. zero bias
D. none of the above

Answer : B. Reverse bias
Explanation:-

81. A train has a mass of 500 tonnes. Its weight is

A. 500 twt
B. 5,00,000 kg-wt
C. 5000 kg-wt
D. 50 t.wt

Answer : B. 5,00,000 kg-wt
Explanation:-

82. In SAP-1 has ……………… T states, period during which register contents change

A. 2
B. 4
C. 6
D. 8

Answer : C. 6
Explanation:-

83. Low voltage circuit breakers have rated voltage of less than

A. 220V
B. 400V
C. 1000V
D. 1200V

Answer : C. 1000V
Explanation:-

84. A three phase to 3 phase cycle converter requires

A. 18 SCRs for 3 phase device
B. 18 SCRs for 6 pulse device
C. 36 SCRs for 3 pulse device
D. 36 SCRs for 4 pulse device

Answer :B. 18 SCRs for 6 pulse device
Explanation:-

85. A forward voltage can be applied to an SCR after its

A. Anode current reduces to zero
B. Gate recovery time
C. Reverse recovery time
D. Anode voltage reduces to zero

Answer : B. Gate recovery time
Explanation:-

86. In a 3 phase semi converter, the three SCRs are triggered at an interval of

A. 60°
B. 90°
C. 120°
D. 180°

Answer : C. 120°
Explanation:-

87. Microprocessor 8085 is the enhanced version of ………….with essentially the same construction set

A. 6800
B. 68000
C. 8080
D. 8000

Answer : C. 8080
Explanation:-

88. A state during which nothing happens is known as

A. LDA
B. NOP
C. MAR
D. QP Code

Answer : B. NOP
Explanation:-

89. Voltage dependent resistors are used

A. As current stabilizers
B. As heating elements
C. For inductive circuits
D. To suppress surges

Answer : D. To suppress surges
Explanation:-

90. Which of the following represents the efficiency of an amplifier

A. 1-distortion
B. Ac power out dc power dissipated at the output electrode of an amplifier
C. Ac power output
D. Ac power output dc power dissipated at the output electrode

Answer : C. Ac power output
Explanation:-

91. Which of the following statement is not TRUE in case of FET

A. It has high input impedance
B. It is less noisy than bipolar transistor
C. It has large (gain X band width)
D. All of the above

Answer : A. It has high input impedance
Explanation:-

92. Oscillators have

A. No feed back
B. Negative feedback
C. Positive feedback
D. Either positive or negative feed back

Answer : C. Positive feedback
Explanation:-

93. A transistor amplifier with 85% efficiency is like to be

A. Class A
B. Class B
C. Class C
D. Class AB

Answer : C. Class C
Explanation:-

94. The decimal equivalent of the binary number 10110.0101011101 is

A. 22.3408216500
B. 22.3408216750
C. 22.3408213125
D. 22.3408203125

Answer : D. 22.3408203125
Explanation:-

95. The main advantage of using crystal oscillator is

A. Constant frequency of oscillations
B. Suitability for low voltages
C. High efficiency
D. High output voltage

Answer : A. Constant frequency of oscillations
Explanation:-

96. A boot strap generally incorporates

A. CB configuration
B. CE configuration
C. Emitter follower
D. None of the above

Answer : C. Emitter follower
Explanation:-

97. Which of the following can have positive or negative charge

A. Electron
B. Ion
C. Hole
D. Neutron

Answer :B. Ion
Explanation:-

98. Radio frequency choke air cored to

A. Keep frequency low
B. Keep frequency high
C. Keep inductive reactance low
D. Keep inductive reactance high

Answer : C. Keep inductive reactance low
Explanation:-

99. Which of the following is a ferromagnetic material

A. Nickel
B. Copper
C. Aluminium
D. Tungsten

Answer : A. Nickel
Explanation:-

100. The e.m.f of a storage battery depends upon

A. Size of the electrodes
B. Shape of the cell
C. Nature of the electrodes
D. All of the above

Answer : C. Nature of the electrodes
Explanation:-