# Range of electrical equipment

Quiz by , created over 5 years ago

## 2 Electrical Science Quiz on Range of electrical equipment, created by brightsparky79 on 05/13/2014.

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 Created by brightsparky79 over 5 years ago
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### 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
• 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
• 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
• 20 A
• 10 A
• 5 A
• 25 A

### Question 4

Question
Transformer cores are laminated to
• 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
• 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
• squirrel cage
• series motor
• shunt motor
• armature motor

### Question 7

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

### Question 8

Question
Which direction will the conductor move if the following conditions were present ?
• 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
• 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
• 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
• 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
• 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
• the rotor only
• the rotor and stator
• field and armature
• the stator only

### Question 14

Question
A wound rotor motor has windings on
• 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
• improve power factor
• limit the current through the lamp
• improve the efficiency

### Question 16

Question
In a three phase induction motor the stator windings
• 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
• 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
• 30
• 7500
• 750
• 75

### Question 19

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

### Question 20

Question
A relay operates in such a way that
• 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?
• 57.5V
• 920V
• 460V
• 115V

### Question 22

Question
Eddy currents are reduced by using
• 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?
• 10A
• 25A
• 5A
• 20A

### Question 24

Question
Which direction will the conductor move if the following conditions were present ?
• down
• left
• right
• up

### Question 25

Question
Which direction will the conductor move if the following conditions were present ?
• 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
• 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
• unidirectional
• rectified
• d.c
• a.c

### Question 28

Question
Which direction will the conductor move if the following conditions were present ?