WorksheetsUnit 262 – Multiple choice practice exam
Total questions: 28
Worksheet time: 14mins
Identify the mechanism shown in the figure below.
An eccentric cam
A gear train
A toggle joint
A pawl and ratchet
Which of the following is a unit of mass?
Newton
Newton per square metre
Kilogram
Metre
Electrical resistance is defined as
Ratio of charge and time
The product of voltage and current
Ratio of voltage and current
Product of charge and time
Inductance property regarding transformer causes
Induced current when the voltage across it changes
Induced emf when the current through it changes
Induced current when the current through it changes
Induced emf when the voltage across it changes
Which defines power the best?
Power is proportional to the square of the time taken
Power is done when a force is moved through a distance
Power is the quality of the energy
Power is the rate of consumption of energy
Which best defines work?
Work is the rate of consumption of energy
Work is the quality of energy
Work is done when a force is moved through a distance
Work is proportional to the square of the time taken
From Table 1, which of the following lists the density from low density to high density?
Gold/Silver/Copper/Steel/Aluminium
Aluminium/Steel/Copper/Silver
Steel/Copper/Aluminium/Gold/Silver
Copper/Aluminium/Steel/Silver/Gold
A force of 12.1 newtons moved through a distance of 20 m. The work done is
2.42 joules
242 joules
0.605 joules
2371.6 joules
Which is the correct relationship between voltage, current and resistance?
R = VI
V = IR
I = R/V
Which two properties affects the voltage drop along a cable?
Area and type of insulation
Resistivity and density
Resistivity and length
Area and tensile strength
A disconnected cable may be live because of which of the following?
Mutual Inductance
Lenz's Law
A decrease in temperature
Increased conductivity
Energy may be stored in a cable due to
Resistance
Capacitance
Impedance
Conductivity
What statement describes about electrons?
Positively charged
Heavier than protons
Heavier than neutrons
Negatively charged
The core of a transformer is laminated to reduce
Copper loss
Eddy current loss
Maintenance
Hysteresis loss
Non-electrolytic capacitors can contain dielectrics which include
Air, copper, iron
Paper, silver, mica
Air, polyester, polystyrene
Paper, Glass, aluminium
Why must large capacitors be fitted with discharge resistors?
In order to reduce buzzing
In order to prevent overheating
In order to improve power factor
In order to prevent danger of electric shock
A magnetic field has lines of magnetic flux which flow from
North to South
South to North
Centre outwards
Outer to centre
Power losses on a transformer due to heating effect on windings are known as
Iron losses
Eddy current losses
Hysteresis losses
Copper losses
What describes an autotransformer?
A single winding with a smaller number of turns on the secondary
Double windings with a smaller number of turns on the secondary
Double windings with a tapping on the secondary
A single winding with a tapping for the secondary
Electric current is the flow of
E.m.f
Atoms
Electrons
Protons
The issues affecting if a cable exceeds the voltage for a long time.
Cools and resistance increase
Overheats and the resistance reduces
Cools and insulation breakdown
Overheats and the insulation breakdown
Ceramic capacitor has
Ceramic tube with metal core
Ceramic plate with a metal film on each face
Two ceramic plates with metal foil between them
A ceramic tube with a metal foil on its surface
A winch is used to lift
Heavy loads through small distances using relatively large effort
Large loads through small distances using relatively small effort
Heavy loads through great distances using relatively large effort
Light loads through great distances using heavy effort
From the options below pick one of the properties which does not affect the volt drop in a cable.
Resistivity
Length
Cross sectional area
Type of insulation
The use of magnetic shielding in UG cables are to
Reduce heating losses
Increase heat loss
Reduce interference
Increase interference
Magnetic flux lines
Are straight lines
Sometimes cross
Will never cross
Always cross
The operation of double wound transformer is
Self-induction
Mutual induction
Hysteresis
Turns ratio
In a transformer the power loss due to the heating effect of the current flowing in the winding is known as
Iron losses
Eddy current losses
Hysteresis losses
Copper losses
