EE Terms 1
EE Terms Mastery Quiz
Test your knowledge on electrical engineering terms with our engaging quiz! Designed for students and professionals alike, this quiz covers a wide range of topics, from transmission line insulators to motor types.
- Multiple choice questions
- Learn and refresh your electrical engineering lexicon
- Ideal for exam preparation and professional certification
For an overhead line, the surge impedance is taken as ______.
500 to 1000 ohms
20 to 40 ohms
70 to 80 ohms
100 to 200 ohms
The corona is considerable affected by which of the following?
Surface condition of the conductor
Size of the conductor
All of the choices
Shape of the conductor
The most likely cause(s) of sparking at the brushes in a dc machine is/are _______.
Defective interpoles
Open coil in the armature
All of the choices
Incorrect brush spring pressure
The presence of ozone due to corona is harmful because it _______.
Transfer energy to the ground
Reduces power factor
Corrodes the material
Gives odor
In a 6-pole dc machine, 90 mechanical degrees correspond to ____ electrical degrees.
270
30
180
45
A feeder, in a transmission system, feeds power to ______.
Service mains
Distributors
All of the choices
Generating stations
Transmission line insulators are made of ______.
Porcelain
Glass
Iron
P.V.C.
In a dc 3-wire distributor using balancers and having unequal loads on the two sides:
Balancer connected to heavily-loaded side runs as a motor
Balancer connected to lightly-loaded side runs as a motor
Both balancers run as generators
Both balancers run as motors
The wooden poles well impregnated with creosite oil or any preservative compound have life ______.
60 to 70 years
25 to 30 years
10 to 15 years
From 2 to 5 years
Which of the following system is not generally used?
1-phase 3 wire
3-phase 3 wire
3-phase 4 wire
1-phase 4 wire
Shunt generators are most suited for stable parallel operation because of their voltage characteristics. Which one?
Identical
Dropping
Linear
Rising
For the voltage build-up of a self-excited dc generator, which of the following is not an essential condition?
Armature speed must be very high
There must be some residual flux
Field winding mmf must aid the residual flux
Total field circuit resistance must be less than the critical value
A potentially lethal electric current is on the order of:
1.0 A
0.5 A
0.1 A
1.5 A
What capacitors are found mainly in SMD form and are used extensively in RF and microwave circuits?
Electrolytic capacitors
Porcelain capacitors
Paper capacitors
Mica capacitors
Suppose you double the voltage in a simple dc circuit and cut the resistance in half. The current will become:
Four times as great
Two times as great
Three times as great
Remain the same
Which of the following configurations can a transistor set up?
Common base
Common Emitter
Common Collector
All of the choices
What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive and/or capacitive reactance?
Rectangular coordinates
Argand diagram
Polar coordinates
All of the choices
The single phase bridge type cycloconverter uses _____ number of SCRs.
8
6
12
4
There are four classes of capacitors from Class 1 to Class 4. What is the relation between class number and capacitor performance?
The lower the class number the better the performance
None of the choices
The higher the class number the better the performance
The lower the class number the poorer the performance
A backward-working electric motor is best described as:
An alternator
None of the choices
An electric generator
A transformer
What are the typical efficiencies of the transformers encountered in electronic circuits?
70 % to 80 %
90 % to 100 %
80 % to 90 %
60 % to 70 %
In the code for Class 1 dielectrics, what symbol is used to indicate the signiיִcant יִgures of the temperature coefיִcient in ppm/°C?
Fourth symbol
Third symbol
Second symbol
First symbol
The rotor winding of a 3-phase wound rotor induction motor is generally______ connected.
Delta
Star
None of the choices
Partially delta and partially star
By which of the following a bus-bar is rated?
Current only
Current, voltage and frequency
Current, voltage, frequency and short time current
Current and voltage
The value of inductance in three-phase line is ______ times the loop inductance for single-phase line.
1/2
3
2
1/3
Overhead system can be designed for operation up to:
400 kV
33 kV
11 kV
66 kV
The auto-starters (using three autotransformers) can be used to start cage induction motor of which of the following types?
Star connected only
None of the choices
Both delta connected and star connected
Delta connected only
Which of the following motor has high starting torque?
Squirrel cage induction motor
None of the choices
Slip ring induction motor
Both slip ring induction motor and squirrel cage induction motor
The primary reason for providing compensating windings in a dc generator is to:
Neutralize cross-magnetizing flux
Maintain uniform flux distribution
Neutralize armature mmf
Compensate for decrease in main flux
In relation to a transformer, the ratio 20:1 indicates that:
There are 20 turns on primary, one turn on secondary
For every 20 turns on primary, there is one turn on secondary
Primary current is 20 times greater than the secondary current
Secondary voltage is 1/20th of primary voltage
One of the following statements concerning parallel operation of transformers, the one which is not correct is:
Transformers must have same ratio of transformation
Transformers must have equal voltage rating
Transformers must be operated at the same frequency
Transformers must have equal kVA ratings
The most efficient method of increasing the speed of a 3.75 kW dc shunt motor would be the ________ method.
Armature control
Ward-Leonard
Tapped-field control
Flux control
The external characteristic of a shunt generator can be obtained directly from its __________ characteristic.
Performance
Internal
Open-circuit
Load-saturation
The volume of copper required for an ac transmission line is inversely proportional to:
Current
Both voltage and power factor
Power factor
Voltage
It is possible to increase the field flux and, the same time, increase the speed of a dc motor provided its ________ is held constant.
Voltage
Armature current resistance
Armature current
Torque
Because ferromagnets have ferromagnetic domains, the net magnetization:
Can never be in the same direction as an applied field.
May not vanish when an applied field is reduced to zero.
Is proportional to any applied magnetic field.
Can never vanish.
When permanent magnet is strongly heated:
Its magnetism increases.
It loses its magnetism.
Nothing happens.
It becomes an induced magnet.
Corona loss can be reduced by the use of hollow conductor because:
Eddy current in the conductor is eliminated
Of better ventilation in the conductor
For a given cross-section, the radius of the conductor is increased
The current density is reduced
A battery is connected across a parallel combination of two identical resistors. If the potential difference across the terminals is V and the current in the battery is I, then:
The potential difference across each resistor is V and the current in each resistor is I = 2
The potential difference across each resistor is V = 2 and the current in each resistor is I = 2
The potential difference across each resistor is V and the current in each resistor is I
The potential difference across each resistor is V=2 and the current in each resistor is I
If R is the distance from a magnetic dipole, then the magnetic field it produces is proportional to:
1/R³
R²
1/R²
1/R
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