869511
Descripción
Test por Vito Martino, actualizado hace más de 1 año
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Creado por Vito Martino
hace más de 10 años
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Pregunta 1
Pregunta
A transformer has 600 turns on the input winding and 150 turns on the output winding. If the input current is 5A what will the secondary current be
Respuesta
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20 A
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10 A
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5 A
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25 A
Pregunta 2
Pregunta
A transformer has 600 turns on the input winding and 150 turns on the output winding. If the input current is 5A what will the secondary current be
Respuesta
-
20 A
-
10 A
-
5 A
-
25 A
Pregunta 3
Pregunta
A transformer has 600 turns on the input winding and 150 turns on the output winding. If the input current is 5A what will the secondary current be
Respuesta
-
20 A
-
10 A
-
5 A
-
25 A
Pregunta 4
Pregunta
Transformer cores are laminated to
Respuesta
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increase eddy currents
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reduce copper losses
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reduce eddy currents
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increase the magnetic flux
Pregunta 5
Pregunta
If a single loop of wire is connected to a commutator and rotated between the poles of a magnet the output will be
Respuesta
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d.c
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ripple free
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square wave
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a.c
Pregunta 6
Pregunta
The type of d.c motor with an armature and field winding in parallel is
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squirrel cage
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series motor
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shunt motor
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armature motor
Pregunta 7
Pregunta
The commutator of a universal motor is mounted on the
Respuesta
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field winding
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stator
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shaft
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slip rings
Pregunta 8
Pregunta
Which direction will the conductor move if the following conditions were present ?
Image:
Slide1.JPG (image/JPG)
Respuesta
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down
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up
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left
-
right
Pregunta 9
Pregunta
What would be the effect on the magnetic fields for the two equal current carrying conductors shown below
Image:
Slide3.JPG (image/JPG)
Respuesta
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the magnetic field around the two conductors would double in strength
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the magnetic field around the two conductors would halve in strength
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the magnetic field around the two conductors would cancel each other out
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the magnetic fields will oppose each other
Pregunta 10
Pregunta
What would be the output voltage for a transformer with a turn ratio of 1:20 and a supply voltage of 50V
Respuesta
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100 V
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1000 V
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2.5 V
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250 V
Pregunta 11
Pregunta
What would be the output voltage for a transformer with a turn ratio of 1:20 and a supply voltage of 50V
Respuesta
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100 V
-
1000 V
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2.5 V
-
250 V
Pregunta 12
Pregunta
What would be the effect on the magnetic fields for the two equal current carrying conductors shown
Image:
Slide2.JPG (image/JPG)
Respuesta
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the magnetic field around the two conductors would double in strength
-
the magnetic fields will reverse
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the magnetic field around the two conductors would halve in strength
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the magnetic field around the two conductors would cancel each other out
Pregunta 13
Pregunta
A wound rotor motor has windings on
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the rotor only
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the rotor and stator
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field and armature
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the stator only
Pregunta 14
Pregunta
A wound rotor motor has windings on
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the rotor only
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the rotor and stator
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field and armature
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the stator only
Pregunta 15
Pregunta
What is the function of the choke in a fluorescent light fitting
Respuesta
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improve power factor
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radio suppression
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limit the current through the lamp
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improve the efficiency
Pregunta 16
Pregunta
In a three phase induction motor the stator windings
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produce a rotating magnetic field
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produce a pulsating magnetic field
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create a leading power factor
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are connected to a commutator
Pregunta 17
Pregunta
In a three phase induction motor the stator windings
Respuesta
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produce a rotating magnetic field
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produce a pulsating magnetic field
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create a leading power factor
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are connected to a commutator
Pregunta 18
Pregunta
Step down transformer has a turn’s ratio of 5:1. The number of secondary turns is 150. The number of primary turns is
Respuesta
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30
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7500
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750
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75
Pregunta 19
Pregunta
400v/230v single phase transformer has a primary current of 12A. The secondary current is
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12A
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6.9A
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24A
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20.87A
Pregunta 20
Pregunta
A relay operates in such a way that
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A current flowing through the relay coil creates a magnetic field which in turn operates the relay contacts
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A current operates the fuse and the relay contacts close
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When the switch is opened the magnetic field created operates the relay
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A magnetic field creates a current which causes the relay contacts to close
Pregunta 21
Pregunta
A transformer has 600 turns on the input winding and 150 turns on the output winding. If the input voltage is 230V what will the output be?
Respuesta
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57.5V
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920V
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460V
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115V
Pregunta 22
Pregunta
Eddy currents are reduced by using
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Laminations
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Less resistance
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Less current
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Lower voltage
Pregunta 23
Pregunta
A transformer has 600 turns on the input winding and 150 turns on the output winding. If the input current is 5A what will the secondary current be?
Respuesta
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10A
-
25A
-
5A
-
20A
Pregunta 24
Pregunta
Which direction will the conductor move if the following conditions were present ?
Image:
Slide4.JPG (image/JPG)
Respuesta
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down
-
left
-
right
-
up
Pregunta 25
Pregunta
Which direction will the conductor move if the following conditions were present ?
Image:
Slide5.JPG (image/JPG)
Respuesta
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down
-
up
-
left
-
right
Pregunta 26
Pregunta
If a single loop of wire is connected to slip rings and rotated between the poles of a magnet the output will be
Respuesta
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unidirectional
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rectified
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d.c
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a.c
Pregunta 27
Pregunta
If a single loop of wire is connected to slip rings and rotated between the poles of a magnet the output will be
Respuesta
-
unidirectional
-
rectified
-
d.c
-
a.c
Pregunta 28
Pregunta
Which direction will the conductor move if the following conditions were present ?
Image:
Slide6.JPG (image/JPG)
Respuesta
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right
-
up
-
left
-
down
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