869511
Descrição
Quiz por Vito Martino, atualizado more than 1 year ago
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Criado por Vito Martino
quase 10 anos atrás
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Questão 1
Questão
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
Responda
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20 A
-
10 A
-
5 A
-
25 A
Questão 2
Questão
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
Responda
-
20 A
-
10 A
-
5 A
-
25 A
Questão 3
Questão
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
Responda
-
20 A
-
10 A
-
5 A
-
25 A
Questão 4
Questão
Transformer cores are laminated to
Responda
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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
Questão 5
Questão
If a single loop of wire is connected to a commutator and rotated between the poles of a magnet the output will be
Responda
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d.c
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ripple free
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square wave
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a.c
Questão 6
Questão
The type of d.c motor with an armature and field winding in parallel is
Responda
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squirrel cage
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series motor
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shunt motor
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armature motor
Questão 7
Questão
The commutator of a universal motor is mounted on the
Responda
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field winding
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stator
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shaft
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slip rings
Questão 8
Questão
Which direction will the conductor move if the following conditions were present ?
Image:
Slide1.JPG (image/JPG)
Responda
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down
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up
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left
-
right
Questão 9
Questão
What would be the effect on the magnetic fields for the two equal current carrying conductors shown below
Image:
Slide3.JPG (image/JPG)
Responda
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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
Questão 10
Questão
What would be the output voltage for a transformer with a turn ratio of 1:20 and a supply voltage of 50V
Responda
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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
Questão 11
Questão
What would be the output voltage for a transformer with a turn ratio of 1:20 and a supply voltage of 50V
Responda
-
100 V
-
1000 V
-
2.5 V
-
250 V
Questão 12
Questão
What would be the effect on the magnetic fields for the two equal current carrying conductors shown
Image:
Slide2.JPG (image/JPG)
Responda
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the magnetic field around the two conductors would double in strength
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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
Questão 13
Questão
A wound rotor motor has windings on
Responda
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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
Questão 14
Questão
A wound rotor motor has windings on
Responda
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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
Questão 15
Questão
What is the function of the choke in a fluorescent light fitting
Responda
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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
Questão 16
Questão
In a three phase induction motor the stator windings
Responda
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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
Questão 17
Questão
In a three phase induction motor the stator windings
Responda
-
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
Questão 18
Questão
Step down transformer has a turn’s ratio of 5:1. The number of secondary turns is 150. The number of primary turns is
Responda
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30
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7500
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750
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75
Questão 19
Questão
400v/230v single phase transformer has a primary current of 12A. The secondary current is
Responda
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12A
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6.9A
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24A
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20.87A
Questão 20
Questão
A relay operates in such a way that
Responda
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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
Questão 21
Questão
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?
Responda
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57.5V
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920V
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460V
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115V
Questão 22
Questão
Eddy currents are reduced by using
Responda
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Laminations
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Less resistance
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Less current
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Lower voltage
Questão 23
Questão
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?
Responda
-
10A
-
25A
-
5A
-
20A
Questão 24
Questão
Which direction will the conductor move if the following conditions were present ?
Image:
Slide4.JPG (image/JPG)
Responda
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down
-
left
-
right
-
up
Questão 25
Questão
Which direction will the conductor move if the following conditions were present ?
Image:
Slide5.JPG (image/JPG)
Responda
-
down
-
up
-
left
-
right
Questão 26
Questão
If a single loop of wire is connected to slip rings and rotated between the poles of a magnet the output will be
Responda
-
unidirectional
-
rectified
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d.c
-
a.c
Questão 27
Questão
If a single loop of wire is connected to slip rings and rotated between the poles of a magnet the output will be
Responda
-
unidirectional
-
rectified
-
d.c
-
a.c
Questão 28
Questão
Which direction will the conductor move if the following conditions were present ?
Image:
Slide6.JPG (image/JPG)
Responda
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right
-
up
-
left
-
down
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