869511
Descripción
Test por Vito Martino, actualizado hace más de 1 año
|
|
Creado por Vito Martino
hace casi 10 años
|
|
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
-
20 A
-
10 A
-
5 A
-
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
-
increase eddy currents
-
reduce copper losses
-
reduce eddy currents
-
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
-
d.c
-
ripple free
-
square wave
-
a.c
Pregunta 6
Pregunta
The type of d.c motor with an armature and field winding in parallel is
Respuesta
-
squirrel cage
-
series motor
-
shunt motor
-
armature motor
Pregunta 7
Pregunta
The commutator of a universal motor is mounted on the
Respuesta
-
field winding
-
stator
-
shaft
-
slip rings
Pregunta 8
Pregunta
Which direction will the conductor move if the following conditions were present ?
Image:
Slide1.JPG (image/JPG)
Respuesta
-
down
-
up
-
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
-
the magnetic field around the two conductors would double in strength
-
the magnetic field around the two conductors would halve in strength
-
the magnetic field around the two conductors would cancel each other out
-
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
-
100 V
-
1000 V
-
2.5 V
-
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
-
100 V
-
1000 V
-
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
-
the magnetic field around the two conductors would double in strength
-
the magnetic fields will reverse
-
the magnetic field around the two conductors would halve in strength
-
the magnetic field around the two conductors would cancel each other out
Pregunta 13
Pregunta
A wound rotor motor has windings on
Respuesta
-
the rotor only
-
the rotor and stator
-
field and armature
-
the stator only
Pregunta 14
Pregunta
A wound rotor motor has windings on
Respuesta
-
the rotor only
-
the rotor and stator
-
field and armature
-
the stator only
Pregunta 15
Pregunta
What is the function of the choke in a fluorescent light fitting
Respuesta
-
improve power factor
-
radio suppression
-
limit the current through the lamp
-
improve the efficiency
Pregunta 16
Pregunta
In a three phase induction motor the stator windings
Respuesta
-
produce a rotating magnetic field
-
produce a pulsating magnetic field
-
create a leading power factor
-
are connected to a commutator
Pregunta 17
Pregunta
In a three phase induction motor the stator windings
Respuesta
-
produce a rotating magnetic field
-
produce a pulsating magnetic field
-
create a leading power factor
-
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
-
30
-
7500
-
750
-
75
Pregunta 19
Pregunta
400v/230v single phase transformer has a primary current of 12A. The secondary current is
Respuesta
-
12A
-
6.9A
-
24A
-
20.87A
Pregunta 20
Pregunta
A relay operates in such a way that
Respuesta
-
A current flowing through the relay coil creates a magnetic field which in turn operates the relay contacts
-
A current operates the fuse and the relay contacts close
-
When the switch is opened the magnetic field created operates the relay
-
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
-
57.5V
-
920V
-
460V
-
115V
Pregunta 22
Pregunta
Eddy currents are reduced by using
Respuesta
-
Laminations
-
Less resistance
-
Less current
-
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
-
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
-
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
-
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
-
unidirectional
-
rectified
-
d.c
-
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
-
right
-
up
-
left
-
down
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.