869511
Descrição
Quiz por Vito Martino, atualizado more than 1 year ago
|
|
Criado por Vito Martino
mais de 10 anos atrás
|
|
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
-
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
-
increase eddy currents
-
reduce copper losses
-
reduce eddy currents
-
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
-
d.c
-
ripple free
-
square wave
-
a.c
Questão 6
Questão
The type of d.c motor with an armature and field winding in parallel is
Responda
-
squirrel cage
-
series motor
-
shunt motor
-
armature motor
Questão 7
Questão
The commutator of a universal motor is mounted on the
Responda
-
field winding
-
stator
-
shaft
-
slip rings
Questão 8
Questão
Which direction will the conductor move if the following conditions were present ?
Image:
Slide1.JPG (image/JPG)
Responda
-
down
-
up
-
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
-
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
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
-
100 V
-
1000 V
-
2.5 V
-
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
-
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
Questão 13
Questão
A wound rotor motor has windings on
Responda
-
the rotor only
-
the rotor and stator
-
field and armature
-
the stator only
Questão 14
Questão
A wound rotor motor has windings on
Responda
-
the rotor only
-
the rotor and stator
-
field and armature
-
the stator only
Questão 15
Questão
What is the function of the choke in a fluorescent light fitting
Responda
-
improve power factor
-
radio suppression
-
limit the current through the lamp
-
improve the efficiency
Questão 16
Questão
In a three phase induction motor the stator windings
Responda
-
produce a rotating magnetic field
-
produce a pulsating magnetic field
-
create a leading power factor
-
are connected to a commutator
Questão 17
Questão
In a three phase induction motor the stator windings
Responda
-
produce a rotating magnetic field
-
produce a pulsating magnetic field
-
create a leading power factor
-
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
-
30
-
7500
-
750
-
75
Questão 19
Questão
400v/230v single phase transformer has a primary current of 12A. The secondary current is
Responda
-
12A
-
6.9A
-
24A
-
20.87A
Questão 20
Questão
A relay operates in such a way that
Responda
-
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
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
-
57.5V
-
920V
-
460V
-
115V
Questão 22
Questão
Eddy currents are reduced by using
Responda
-
Laminations
-
Less resistance
-
Less current
-
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
-
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
-
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
-
right
-
up
-
left
-
down
Quer criar seus próprios Quizzes gratuitos com a GoConqr? Saiba mais.