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Transistors/ Transformers/ Relays

Total questions: 61

Worksheet time: 43mins

Name
Class
Date
1.

Transistors act like tiny "____________."

a)

Electron sources

b)

Switches

c)

Batteries

d)

Bees?

2.

What are the names of the terminals X, Y and Z?

a)

X = Base, Y = Collector, Z = Emitter

b)

X = Emitter, Y = Base, Z = Collector

c)

X = Collector, Y = Base, Z = Emitter

d)

X = Collector, Y = Emitter, Z = Base

3.

One function of the transistor is to_____________?

a)

rectify

b)

amplify

c)

limit

d)

control

4.

What are the names of the legs on a Bipolar Junction Transistors? (3 Correct)

a)

Base

b)

Collector

c)

Emitter

d)

Anode

e)

Gate

5.

A transistor is a …………… operated device

a)

Voltage

b)

Both Voltage and Current

c)

Current

d)

None of the Above

6.

How many terminals are there in a transistor....?

a)

1

b)

2

c)

3

d)

4

7.

What are the 2 types of transistors

a)

Positive, Negative

b)

X, Y

c)

NPN, PNP

d)

TNT, NTN

8.

Which transistor is this?

a)

NPN

b)

PNP

c)

Neither

d)

Both

9.

Which transistor is this?

a)

NPN

b)

PNP

c)

Neither

d)

Both

10.

What is this pin called with the arrow?

a)

Emitter

b)

Base

c)

Collector

d)

Transistor

11.

What is this pin called with the arrow?

a)

Emitter

b)

Base

c)

Collector

d)

Transistor

12.

What is this pin called with the arrow?

a)

Emitter

b)

Base

c)

Collector

d)

Transistor

13.

What is the difference between a PNP and NPN?

a)

Emitter arrow direction

b)

Base is different

c)

Collector is on the other end

d)

Nothing, they are the same

14.

What are two uses of the transistor? (Select all that apply to get correct answer)

a)

Amplifier

b)

Switch

c)

Light

d)

Current limiter

15.

A transistor is made up of what components?

a)

LEDs

b)

Resistors

c)

Diodes

d)

Capacitors

16.

The transistor you've checked, what type was it....?

a)

pnp

b)

pnpn

c)

npnp

d)

npn

17.

If the Current in the display is 0.25A, what does it mean....?

a)

None

b)

The power supply unit continuously supply 0.25A only

c)

The power supply unit allow more than 0.25A

d)

The power supply unit does not allow more than 0.25A

18.

What was the first thing to do when supplying a voltage to a circuit.......?

a)

Connect the supply directly

b)

Connect the supply directly and increase the voltage gradually

c)

Decrease the voltage gradually

d)

Measure the required voltage and supply

19.
Your body is a conductor of electricity.
a)
true
b)
false
20.
What is the function of the neutral wire?
a)
To carry a high voltage
b)
To complete circuit
c)
It is a safety wire
21.
The fuse in a circuit melts when:
a)
An appliance isn't earthed
b)
Too much current flows
c)
Too much voltage flows
22.
What's the first thing you should do if someone is shocked electrically?
a)
Use the fire extinguisher
b)
Check for breathing and heartbeat
c)
Turn off the power source
d)
Remove the person from the power source
23.

Found in electrical devices and helps to stop too much current from damaging the device

a)

circuit

b)

current

c)

fuse

24.
Overloading a circuit with too many appliances could cause overheating and fire.  
a)
True
b)
False
25.
It is unsafe for you to work with electricity when you are wet or standing in water.  
a)
True
b)
False
26.

Why are these bird safe?

a)

They are only touching one wire, so the current has nowhere to go

b)

They are touching two different wires, so the current cannot flow to the ground

c)

They are touching a wire and a pole connected to the ground, so the current can only flow to the ground

27.

Why are this bird unsafe?

a)

It is touching two different wires, so the current can flow through the bird in a loop

b)

It is touching two different wires, so the current can flow to the ground

28.

to convert from 230 Volts to 110 Volts you would need a

a)

step up transformer

b)

step down transformer

c)

a 230 Volt generator

d)

a 110 Volt generator

29.

Relay is an electromagnetically operated switch. It has coil and contacts.

a)

True

b)

False

30.

The part which creates magnetic field when it is energized to attract the relay's armature is.

a)

Coil

b)

Spring

c)

NO Contact

d)

All of the above

31.

The following are applications of using electrical relay

a)

Industrial Automation

b)

Lighting Systems

c)

Elevators Control Systems

d)

Electrical Heaters

e)

All of the Above

32.

The Relay Contacts are directly connected with....................

a)

Coil

b)

Spring

c)

Armature

d)

All of the Above

33.

When the the current flows through the coil of the relay, it will produce magnetic field which will attract the armature to close the NO contact.

a)

True

b)

False

34.

Which symbol is the fuse?

a)
b)
c)
d)
35.

Which symbol is for an open switch

a)
b)
c)
d)
36.

Which symbol is the relay?

a)
b)
c)
d)
37.

Battery

a)
b)
c)
d)
38.

Diode

a)
b)
c)
d)
39.

LED

a)
b)
c)
d)
40.

Transistor

a)
b)
c)
d)
41.

Why is electrical wiring usually are covered with a layer of plastic?

a)

To make it look pretty

b)

To help electricity flow along the wire

c)

To make it safe

d)

To add more energy

42.
A means of fusing together two metal objects to create an electrical connection is called:
a)
soldering
b)
wiring
c)
programming
d)
welding
43.
The correct way to hold this object is like a:
a)
a hammer
b)
a tennis racket
c)
a pencil
d)
a football
44.
This is used to:
a)
warm up the iron
b)
clean the iron
c)
get metal onto the iron
d)
none of the above
45.

Identify the electronic symbol.

a)

NPN transistor

b)

Transistor

c)

PNP transistor

d)

Bipolar transistor

46.

Identify the electronic symbol.

a)

Relay

b)

Contactor

c)

Coil with switch

d)

Inductor and switch

47.

LDR means

a)

Light Dependent Resistor

b)

Light Device Regulator

c)

Low Drive Resistor

48.

A Transistor can be...

a)

PN and NP

b)

PNP and NPN

c)

All are correct

49.

What family is the transistor part of?

a)

LED

b)

Diode

c)

Semiconductor

d)

Resistor

50.

How much voltage (approximately) should be between the emitter and base?

a)

1V

b)

2V

c)

0.2V

d)

0.6V

51.

Which transistor is this?

a)

PNP

b)

NPN

c)

Neither

d)

Both

52.

Which transistor is this?

a)

PNP

b)

NPN

c)

Neither

d)

Both

53.

Primary winding of a transformer is determined by _________.

a)

which winding has more turns

b)

which winding is nearer to the load

c)

which winding is connected to the source

d)

which side has the highest voltage

54.

Which of the following does not change in a transformer?

a)

Voltage

b)

Current

c)

Power

d)

Frequency

55.

This picture is an example of a ________________.

a)

Motor

b)

Generator

c)

Step-up transformer

d)

Step-down transformer

56.

An electrical device, typically incorporating an electromagnet, which is activated by a current or signal in one circuit to open or close another circuit.

a)

RCD

b)

Isolating transformers

c)

MCB

d)

Relay

57.
Will a transformer work with direct current (d.c.) or alternating current (a.c.)?
a)
a.c. only
b)
d.c. only
c)
Both a.c. and d.c.
58.

What is meant by a step down transformer?

a)

The output voltage is the same as the input voltage.

b)

The output voltage is larger than the input voltage.

c)

The output voltage is smaller than the input voltage.

59.
Based on this picture, which side will have a higher voltage?
a)
Secondary
b)
Primary
c)
Both sides have the same voltage
d)
Cannot be determined
60.
A device that uses two coils around an iron core to change the voltage across a circuit is called a 
a)
voltmeter
b)
diode
c)
transformer
d)
generator
61.
The primary coil of a transformer has 80 turns on it, and the secondary coil has 40 turns on it.  This is 
a)
a step-up tansformer
b)
a step-down transformer
c)
either of the above depending on the relative input and output currents.

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