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Electrical Engineering
Electric Traction
Quiz 3
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Q.1
The wheels of a train, engine as well as bogies, are slightly tapered to
Reduce friction
Increase friction
Facilitate braking
Facilitate in taking turns
Q.2
Coefficient of adhesion is
High in case of D.C. traction than in the case of AC. traction
Low in case of D.C. traction than in the case of AC. traction
Equal in both AC. and D.C. traction
Any of the above
Q.3
Specific energy consumption becomes
More on steeper gradient
More with high train resistance
Less if distance between stops is more
All of the above
Q.4
Overhead lines for power supply to tram cars are at a minimum height of
3 m
6 m
10 m
15 m
Q.5
In case of ___________ free running and coasting periods are generally long.
Mainline service
Urban service
Suburban service
All of the above
Q.6
Energy consumption in propelling the train is required for which of the following?
Work against the resistance to motion
Work against gravity while moving up the gradient
Acceleration
All of the above
Q.7
Series motor is not suited for traction duty due to which of the following account?
Less current drain on the heavy load torque
Current surges after temporary switching off supply
Self relieving property
Commutating property at heavy load
Q.8
Specific energy consumption is affected by which of the following factors?
Retardation and acceleration values
Gradient
Distance between stops
All of the above
Q.9
For 25 kV single phase system power supply frequency is
60 Hz
50 Hz
25 Hz
16 Hz
Q.10
For given maximum axle load tractive efforts of AC. locomotive will be
Less than that of D.C. locomotive
More than that of D.C. locomotive
Equal to that of D.C. locomotive
None of the above
Q.11
Quadrilateral speed-time curve pertains to which of the following services?
Main line service
Urban service
Suburban service
Urban and suburban service
Q.12
The value of coefficient of adhesion will be high when rails are
Greased
Wet
Sprayed with oil
Cleaned with sand
Q.13
Specific energy consumption is least in _______ service.
Main line
Urban
Suburban
None of these
Q.14
In India diesel locomotives are manufactured at
Ajmer
Varanasi
Bangalore
Jamalpur
Q.15
Electric locomotives in India are manufactured at
Jamalpur
Bangalore
Chittaranjan
Gorakhpur
Q.16
Which of the following state capitals is not on broad gauge track ?
Lucknow
Bhopal
Jaipur
Chandigarh
Q.17
The speed of a superfast train is
60 kmph
75 kmph
100 kmph
More than 100 kmph
Q.18
The normal value of adhesion friction is
0.12
0.25
0.40
0.75
Q.19
In a steam locomotive electric power is provided through
Overhead wire
Battery system
Small turbo-generator
Diesel engine generator
Q.20
Glass, rubber, silk, and plastic are all examples of
Conductors
Insulator
Thermel conductivity
Materials
Q.21
The types of energy that a load can change electrical energy into.
sound
heat or thermal
light
motion or kinetic
All of above
Q.22
__________ is stored energy.
Potential
Kinetic
None of the above
All of the above
Q.23
____________ is the ability to cause change.
Energy
Force
Friction
Motion
Q.24
Static electricity occurs because...
of thunder
of humid air
of neutral particles adding up
of a buildup of charges on an object.
Q.25
Se requiere establecer en un accionamiento un sistema de freno eléctrico rápido, Seria:
Freno por Contracorriente
Freno mecánico de Disco
Freno por Corriente Continua
Ninguno de los anteriores
Q.26
A que Regimen se relaciona la potencia Efectiva de un motor
Regimen Intermitente
Regimen de Corta duración
Regimen Continuo
Ninguna de las anteriores
Q.27
Cuando se arranca un motor con arranque Estrella-Deltael voltaje al arrancar respecto al voltaje nominal es:
50.7%
65.0%
57.7%
66.7
Q.28
Si se desea arrancar un motor en forma eficiente con eldel voltaje nominal, que arranque será mas apropiado
Con Resistencia
Con Autotransformador
Estrella Delta
Ninguno de los anteriores
Q.29
Que convertidor debo utilizar para alimentar un Torno con motor deV y Hz, si la red disponible es deV yHz.
DC-AC
AC-DC
AC-AC
ninguno de los anteriores
Q.30
The main function of capacitor is to ......
supply energy to the circuit
decrease the voltage difference between capacitor plates
store charges in capacitor
All of above
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