WorksheetsElectrical Engineering Quiz
Total questions: 24
Worksheet time: 12mins
What are the two types of iron-core construction?
Laminated type and Non-laminated type
Core type and Shell type
Magnetic type and Non-magnetic type
Insulated type and Non-insulated type
Which of the following components is present in both core-type and shell-type transformer constructions?
Laminated core
High-voltage winding
Low-voltage winding
Leads
What is the primary difference between core-type and shell-type transformer constructions?
The number of windings
The placement of the laminated core
The type of leads used
The voltage levels they handle
Renewable sources of energy from the list would be
Wind and solar
Gas and oil
Coal
Nuclear
The efficient way of electricity transmission would be
High voltage/ low current method
High current/ Low voltage
DC
Very large conductors
Fuses are used to protect electrical plant and apparatus by acting as
The weakest link for overcurrents
A voltage sensitive link
A surge protector
A fault monitor
Generation, transmission and distribution system relationships are maintained by
Oftel
Ofcom
Ofgem
Ofsted
Underground cables are less expensive than overheads only in terms of
Maintenance
Repair and jointing
Manufacture
Installation
PME are also named as
TN-S
TN-C-S
SNE
TT
A neutral in SNE four wire system is to provide
230V Supply
400V Supply
Balanced load
Bonding condition
The objective of powder filling in fuse cartridges is to
Smoothen the arc when the link operates
Centralise the fuse link
Reduce the corrosion of the fuse
Damp out vibrations of the link
Which type of fuse, found in a ring main unit, is used to protect a transformer?
Drop out expulsion fuse
Low voltage fuses
High voltage fuses
Trip coil fuses
The purpose of a current transformer
Produce dc current for the protection of large transformers
Increase the current in a relay circuit
Provide current for solenoid operation of a circuit breaker
Provide current for the operation of protective devices
The high voltage surge arrestor is to:
Indicate faults on the network
Stop large fault currents on the network
Disconnect the circuit under fault conditions
Limit impulses on the network to acceptable values
A transformer has input voltage of 33KV and output of 11KV. The 11Kv winding is termed as
High voltage
Primary
Secondary
Intermediate
The resistance and reactance in a circuit between live and earth is more commonly known as
Insulation resistance
Insulation continuity
Earth fault loop impedance
Earth fault relay voltage
From the figure below, identify the transformer marked number
1
2
3
4
A low earth resistance value for a transformer means
High fault current, quick supply disconnection
Low fault current, quick supply disconnection
High fault current, slow supply disconnection
Low fault current, slow supply disconnection
What is the effect of coil resistance in a practical transformer?
It increases the voltage drop significantly
It causes a significant power gain
It causes a slight power loss and reduction in efficiency
It has no effect on the transformer
What is the power loss associated with coil resistance called?
Iron loss
Core loss
Copper loss
Magnetic loss
How does copper loss vary in a transformer?
It varies linearly with the load current.
It varies as the square of the load current.
It remains constant regardless of the load current.
It varies inversely with the load current.
What is the term used to describe the flow of magnetic field lines through a given area?
Electric flux
Magnetic flux
Magnetic field
Electric field
Which of the following is a part of the cooling systems in a transformer?
Core
Current carrying conductors
Insulations
Cooling systems
What common problems are the transformer core susceptible to during its service life?
Insulation to ground failure at the clamp and crossbars
Overheating of the transformer oil
Mechanical wear and tear
Corrosion of the transformer casing
