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Range of electrical equipment

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2 Electrical Science Quiz on Range of electrical equipment, created by Vito Martino on 13/05/2014.
Vito Martino
Quiz by Vito Martino, updated more than 1 year ago
Vito Martino
Created by Vito Martino over 10 years ago
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Resource summary

Question 1

Question
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
Answer
  • 20 A
  • 10 A
  • 5 A
  • 25 A

Question 2

Question
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
Answer
  • 20 A
  • 10 A
  • 5 A
  • 25 A

Question 3

Question
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
Answer
  • 20 A
  • 10 A
  • 5 A
  • 25 A

Question 4

Question
Transformer cores are laminated to
Answer
  • increase eddy currents
  • reduce copper losses
  • reduce eddy currents
  • increase the magnetic flux

Question 5

Question
If a single loop of wire is connected to a commutator and rotated between the poles of a magnet the output will be
Answer
  • d.c
  • ripple free
  • square wave
  • a.c

Question 6

Question
The type of d.c motor with an armature and field winding in parallel is
Answer
  • squirrel cage
  • series motor
  • shunt motor
  • armature motor

Question 7

Question
The commutator of a universal motor is mounted on the
Answer
  • field winding
  • stator
  • shaft
  • slip rings

Question 8

Question
Which direction will the conductor move if the following conditions were present ?
Image:
Slide1.JPG (image/JPG)
Answer
  • down
  • up
  • left
  • right

Question 9

Question
What would be the effect on the magnetic fields for the two equal current carrying conductors shown below
Image:
Slide3.JPG (image/JPG)
Answer
  • 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

Question 10

Question
What would be the output voltage for a transformer with a turn ratio of 1:20 and a supply voltage of 50V
Answer
  • 100 V
  • 1000 V
  • 2.5 V
  • 250 V

Question 11

Question
What would be the output voltage for a transformer with a turn ratio of 1:20 and a supply voltage of 50V
Answer
  • 100 V
  • 1000 V
  • 2.5 V
  • 250 V

Question 12

Question
What would be the effect on the magnetic fields for the two equal current carrying conductors shown
Image:
Slide2.JPG (image/JPG)
Answer
  • 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

Question 13

Question
A wound rotor motor has windings on
Answer
  • the rotor only
  • the rotor and stator
  • field and armature
  • the stator only

Question 14

Question
A wound rotor motor has windings on
Answer
  • the rotor only
  • the rotor and stator
  • field and armature
  • the stator only

Question 15

Question
What is the function of the choke in a fluorescent light fitting
Answer
  • improve power factor
  • radio suppression
  • limit the current through the lamp
  • improve the efficiency

Question 16

Question
In a three phase induction motor the stator windings
Answer
  • produce a rotating magnetic field
  • produce a pulsating magnetic field
  • create a leading power factor
  • are connected to a commutator

Question 17

Question
In a three phase induction motor the stator windings
Answer
  • produce a rotating magnetic field
  • produce a pulsating magnetic field
  • create a leading power factor
  • are connected to a commutator

Question 18

Question
Step down transformer has a turn’s ratio of 5:1. The number of secondary turns is 150. The number of primary turns is
Answer
  • 30
  • 7500
  • 750
  • 75

Question 19

Question
400v/230v single phase transformer has a primary current of 12A. The secondary current is
Answer
  • 12A
  • 6.9A
  • 24A
  • 20.87A

Question 20

Question
A relay operates in such a way that
Answer
  • 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

Question 21

Question
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?
Answer
  • 57.5V
  • 920V
  • 460V
  • 115V

Question 22

Question
Eddy currents are reduced by using
Answer
  • Laminations
  • Less resistance
  • Less current
  • Lower voltage

Question 23

Question
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?
Answer
  • 10A
  • 25A
  • 5A
  • 20A

Question 24

Question
Which direction will the conductor move if the following conditions were present ?
Image:
Slide4.JPG (image/JPG)
Answer
  • down
  • left
  • right
  • up

Question 25

Question
Which direction will the conductor move if the following conditions were present ?
Image:
Slide5.JPG (image/JPG)
Answer
  • down
  • up
  • left
  • right

Question 26

Question
If a single loop of wire is connected to slip rings and rotated between the poles of a magnet the output will be
Answer
  • unidirectional
  • rectified
  • d.c
  • a.c

Question 27

Question
If a single loop of wire is connected to slip rings and rotated between the poles of a magnet the output will be
Answer
  • unidirectional
  • rectified
  • d.c
  • a.c

Question 28

Question
Which direction will the conductor move if the following conditions were present ?
Image:
Slide6.JPG (image/JPG)
Answer
  • right
  • up
  • left
  • down
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