Worksheets2365 Level 2 Electrical, Unit 202
Total questions: 48
Worksheet time: 9hrs 52mins
Work done is calculated by Multiplying......
Distance x Time
Distance x Mass
Force x Velocity
Force x Distance
The SI unit for power is?
Volt
Watt
Ohm
Amp
Electric current is the movement of?
Atoms
Neutrons
Electrons
Protons
What one of the following is used to determine the resistance in an electrical circuit?
Amps / Watts
Volts x Amps
Watts x Amps
Volts / Amps
An electric motor supplies 4kw of power when operating at an efficiency of 80%. How much power does the motor itself intake
3.2kw
5kw
20kw
80kw
Which of the following does NOT conduct electricity?
Brass
Aluminium
PVC
Copper
A typical insulator for an 11kv overhead line would be?
Rubber
Mica
Oil
Glass
Conducting materials contain electrons which are......
Freely displaced
Tightly healed together
Positively charged
Collected from the atmosphere
The electrical energy supplied by a lead acid battery is produced by a?
Chemical action
Magnetic action
Thermal action
Mechanical action
which of the following has the lowest resistivity?
Aluminium
Copper
Steel
Lead
Insulation material found in MICC is?
Manganese Oxide
Magnesium dioxide
Manganese dioxide
Magnesium oxide
When the resistance of an electrical circuit is increased, the.......
Power will increase
current is reduced
current will increase
current and power stay the same
A resistive load in a circuit converts electrical energy into?
Heat
Mechanical force
Pressure
Kinetic
The relationship between the mass of a body (M), the applied force to the body (f) and the acceleration of the body (a) is given by the formula?
Force = mass x acceleration
Mass = force x acceleration
acceleration = mass x force
acceleration = mass / force
The SI unit of time in the second. Express 0.00001 seconds in a suitable sub multiple:
10 milli seconds
100 milli seconds
100 microseconds
10 microseconds
In a magnetic circuit the magnetic field strength (H) is expressed in ampere turns/Meter. H is calculated using the formula?
H = I/NL
H = NI/L
H = IL/N
H=NL/I
The formula used to calculate the resiustance of a conductor given, Length (L), Cross sectional area (A), Resistivity (P)
R = pl/a
R = a/pl
R = pa/l
R = al/p
If the input energy and output energy of a machine are known, the percentage efficiency of the machine is calculated using the formula?
output/input x100
input/output x 100
output x imput / 100
input x output / 100
Electric current is the flow of negatively charged particles called?
protons
electrons
neutrons
atoms
Good insulating materials are materials which have an atomic structure with.....
a few free electrons
many free electrons
many free protons
few free protons
Given the formula Force = mass x acceleration. a object is accelerated at 2m/2sec when a force of 10 newtons is applied, calculate the mass of the object.
2kg
5kg
10kg
20kg
A d.c machine pas a power output of 1200w. the imput current is 4A and the applied voltage is 375v. what is the efficiency of the machine?
50%
80%
85%
90%
Two resistors of 20 and 40 ohms are connected in series across a 120v d.c supply, what is the current?
0.5A
2A
5A
20A
What are the correct units for power, voltage and current?
joule, watt, amps
Watt, volt, amp
joule, volt, amp
watt, volt, tesla
Using ohms law, esplain how we find voltage if we know current and resistance
V = I/R
V = I + R
V = I x R
V = I - R
If a motor supplies 8kw of power when operasting at an efficiency of 80%, how much power does the motor itself take?
10kw
6.4kw
14.4kw
4.44kw
What materials do NOT conduct electricity?
Copper
Ceramic
Brass
Silver
What voltage is used in the trasnmition of electrical energy via the national grid
132kv
275kv
11kv
400kv
If 10m of cable is 5 ohms, what is the resistance 80m?
50 ohms
40 ohms
80 ohms
The formula of resistivity is?
R=LxA/p
p=RxA/L
L=RxAxp
RxA/pxL
You have the following resistors not wired in series 0.23 0.54 0.42, Rt is?
0.11 ohms
0.53 ohms
8.5 ohms
2.11 ohms
What is conventional flow?
Positive to Positive
Negative to Negative
Negative to Positive
Positive to Negative
The image shown represents that of a
an Cosine wave
a DC Voltage
a Sinewave
a Complex waveform
Given A = B + C, Make B the subject
B = c-a
B = a+c
B = a-c
B = a/c
what is the si unit for weight?
mass
weight
newtons
kilograms
What does A.C stand for?
Alternating Current
Alternating copper
ohms
A.C
name all 3 effects on electrical current
heat , chemical , attraction
thermal,chemical,magnetic
temperature, chemical ,metallic
fire , chemical , magnets
Increasing the length of a conductor will ....
Decrease the resistance
Double the resistance
Half the resistance
Increase the resistance
What is shown in this image
Light Emitting Diode
Photodiode
Zender Diode
Diode
What is shown in this image
Light Emitting Diode
Photodiode
Zender Diode
Diode
What do all of these items have in common?
They are resistors
They produce light
They are diodes
How are Voltmeters and ammeters connected?
Voltmeter = Series
Ammeter = Parallel
Voltmeter = Parallel
Ammeter = Parallel
Voltmeter = Series
Ammeter = Series
Voltmeter = Parallel
Ammeter = Series
What is the formula used to calculate force (N)?
Mass x weight
Mass / gravity
Weight x Gravity
Mass x Gravity
What is the Formula for work done?
Force x distance
Mass x Distance
force x gravity
The Formula for Average power is?
Work done / Time
Force / work done
Work done x time
Force x work done
If 10m of cable is 5 ohms, What would the resistance be if the cable was 80m
50 ohms
40 Ohms
80 Ohms
5 Ohms
Which of the following electronic devices are suitable for detecting temperature change?
Variable resistor
Thermistors
Zener Diode
Triac
What effort is required to lift the load
50N
200N
10N
