WorksheetsTechnical English for Electrical-Electronics
Total questions: 71
Worksheet time: 36mins
In the speed control system, the controlled variable is ...?
The speed of the engine
Engine
Trigger signal
Error signal
What is an electrical circuit breaker?
A device that converts electrical energy into mechanical energy
A device that stores electrical energy
A device that measures electrical energy
A device that interrupts electrical current when it exceeds a safe level
Types of diodes used in lighting system and display
LED
Rectifier diodes
Zener diodes
Schottky
What is an AD converter?
Receives a continuous input signal and converts it into a series of corresponding numeric values
Receives and converts digital values into two forms: analog and digital
Converts signals into digital values that can be processed, adjusting the desired working mode
Accepts and processes strings of numeric values and converts them into desired values
In open loop system
the control action depends on the size of the system
the control action depends on system variables
the control action depends on the input signal
the control action is independent of the output
Which of the following is made up of semiconductors?
Transistor
Resistor
Capacitor
Inductor
Anode is ........ polarity in diodes
Negative
Positive
Ground
Hot side
What is the difference between a series and a parallel circuit?
A series circuit has one path for current to flow, while a parallel circuit has multiple paths.
A series circuit has multiple paths for current to flow, while a parallel circuit has one path.
A series circuit and a parallel circuit are the same things.
There is no difference between a series circuit and a parallel circuit.
What is an electrical fuse?
A device that converts electrical energy into mechanical energy
A device that stores electrical energy
A device that measures electrical energy
A device that protects electrical circuits from overcurrent
What is an electric motor?
A device that converts mechanical energy into electrical energy
A device that converts electrical energy into mechanical energy
A device that stores electrical energy
A device that measures electrical energy
The basic insulation prevents people from coming in contact with live parts and is the fundamental protection against contact. To be effective as a protection, the insulation material must completely cover the live parts.
insulation
direct
indirect
isolation
The logic expression for a ................ is the same as an OR gate but with an inversion bar over the entire operation.
NOR gate
OR gate
AND gate
XOR gate
The output of an ............... will be true when any of the inputs are true.
NOR gate
OR gate
AND gate
XOR gate
The rotor of the induction motor runs
at synchronous speed
above synchronous speed
below synchronous speed
Any of the above
Which of the following should be used to disconnect power to electrical equipment before servicing?
Screwdriver
Pliers
Circuit breaker
Hammer
How to write the following time: 10:45
A quarter to eleven
A quarter past ten
A quarter after eleven
A quarter past eleven
What is the purpose of a diode?
To convert AC to DC
To convert DC to AC
To regulate voltage levels
To allow current to flow in only one direction
The n side will have a large number of electrons and very few holes (due to thermal excitation) whereas the p side will have a high concentration of holes and very few electrons. Due to this, a process called ...(1)...diffusion takes place.
saturation
conversion
combination
diffusion
A may be a piece of equipment, perhaps just a set of machine parts functioning together, the purpose of which is to perform a particular operation
controlled variable
plant
feedback control
controller
A control system in which the control action is somehow dependent on the output is known as
closed-loop control system
open-loop control systems
disturbance
controlled variable
What is the primary function of a control system?
To generate disturbances
To regulate and manipulate system behavior
To increase system complexity
To minimize system efficiency
A is a combination of components that act together and perform a certain objective
disturbance
system
feedback control
controller
What is the plant concept in the speed control system?
Close Open
Fuel
Engine
Load
One safe work practice while working around electrical equipment is:
Wear jewelry.
Use conductive ladders.
Use insulated tools.
Wear keys or keychains on your clothing.
The slip speed of an induction motor may be defined as the
Number of pairs of poles ÷ frequency
Rotor speed - synchronous speed
Rotor speed + synchronous speed
Synchronous speed - rotor speed
Component that Convert AC to DC and allow current to flow in one Direction
Capacitor
Inductor
Diode
Resistor
Which of the following should be done before working on electrical equipment?
Wear insulated gloves
Use a metal ladder
Keep the equipment plugged in
Stand on a wet surface
In an open loop control system
Output is independent of control input
Only system parameters have effect on the control output
Output is dependent on control input
None of the above
In diode, the region on either side of the junction which becomes free from the mobile charge carriers is called
Energy gap region
Diffusion region
Charge free region
Depletion region
Diode has polarity
Anode and cathode
Output and input
On and off
None of the above
The diode acts as a valve in the electronic and electrical circuit. A P-N junction is the simplest form of the diode which behaves as ideally short circuit when it is in ...(1)... and behaves as ideally open circuit when it is in the ...(2)....
(1): forward biased; (2): reverse biased
(1): rated specified voltage; (2): reverse breakdown voltage
(1): reverse breakdown voltage; (2): rated specified voltage
(1): reverse biased; (2): forward biased
The proportional integral controller is used to
decrease the steady state error without affecting the stability of the control system
improve the stability of control system and reduce the steady state error
make the unstable control system into a stable one
improve the stability of control system without affecting the steady state error
The output of an ..... will only be true if all the inputs are true.
NOR gate
OR gate
AND gate
XOR gate
The frequency of the induced emf in an induction motor is
Greater than the supply frequency
Lesser than the supply frequency
Same as the supply frequency
None of these
The proportional derivative controller is used to
decrease the steady state error and improve the stability of the control system
improve the stability of control system and reduce the steady state error
decrease the steady state error
improve the stability of control system without affecting the steady state error
What is/are the advantage(s) of an open-loop control system?
Simple
Economical
Low maintenance
All of the above
How to write the following time: 8:05
Five minutes past eight
Five (oh) eight
Five minutes to eight
Five minutes till eight
The output of an XNOR gate will be true when
the input codes are equivalent to one another
any of the inputs are true
all the inputs are true
none of the above
In Diode, why is it called "barrier potential"?
because it acts as a bridge and allows the further migration of holes and electrons across the junction.
because it acts as a barrier and opposes the further migration of holes and electrons across the junction.
because it acts as a barrier and opposes the further migration of holes across the junction.
because it acts as a barrier and opposes the further migration of electrons across the junction.
If one of the three phases of the induction motor fails due to fault. The motor will
stop and do permanent damage if it was running overloaded
continue running but will draw more current if it was operating at rated load
will not be affect the operation if light loaded
any of the mentioned
Which of the following is not correct?
Ammeter is an instrument for measuring either direct (DC) or alternating (AC) electric current.
In circuit diagrams, the symbol for an ammeter is a circle with a capital A inside.
An ammeter is always connected in parallel with a device to measure its electrical current.
Most ammeters have little or no electrical resistance and are simply connected in series with the circuit to be measured.
A is a signal that tends to adversely affect the value of the output of a system
input
system
feedback control
disturbance
Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be
Ns
s.Ns
(1 - s)Ns
(Ns - 1)s
What is the purpose of grounding electrical systems?
To provide a path for current to flow
To protect against electric shocks
To reduce electrical resistance
To increase energy efficiency
The output will be true when the input codes are different from one another. This statement represents .............
NAND gate
OR gate
AND gate
XOR gate
If in a 3-phase induction motor, two phases open accidentally, the motor will
Run at dangerously high speed
Stop
Continue to run depending on load
None of these
The stator core of a 3- phase induction motor is laminated in order to reduce the
Eddy current loss
Hysteresis loss
Both eddy current and hysteresis I loss
Weight of the stator
What is/are the disadvantage(s) of closed-loop control systems?
Expensive
High Maintenance
Difficult installation
All of the above
What is a voltmeter used for?
A voltmeter is a device that measures electromotive force (EMF) of direct current or alternating current on a scale commonly in volts, millivolts, or kilovolts.
A voltmeter is a device that measures voltages of direct current or alternating current on a scale commonly in volts, millivolts, or kilovolts.
A & B are correct.
A & B are not correct.
Three-phase slip ring induction motor is fed from the rotor side with the stator winding short-circuited. The frequency of the current flowing in the short-circuited stator is
Slip frequency
Supply frequency
The frequency corresponding to rotor speed
Zero
How to write the following cardinal number: 4,100,000,000,000
Four trillion one hundred billion
Four thousand one hundred billion
Four hundred and ten billion
A and B are correct
What is/are the advantage(s) of closed-loop control systems?
Reliable
Fast
Optimizable
All of the above
Choose all the correct answers that are true about the logic symbol:
A logic symbol is a graphical representation of the circuit that can be used in a schematic to show how circuits in a system interface to one another.
For the set of basic logic gates, there are uniquely shaped symbols that graphically indicate their functionality.
For more complex logic circuits that are implemented with multiple basic gates, a simple rectangular symbol is used.
Inputs of the logic circuit are typically shown on the right of the symbol and outputs are on the left.
The basic principle of a voltmeter is that it must be connected ...(1)...to the circuit in which the voltage has to be measured. A parallel connection is used because a voltmeter is built in such a way that it has a ...(2). ... value.
(1): in parallel; (2) very high resistance
(1): in series; (2) very high resistance
(1): in parallel; (2) very low resistance
(1): in series; (2) very low resistance
The IEC International Protection Code2 has standardized designations composed of the letters IP followed by two characteristic numerals, which describe the degree of protection offered by different types of enclosures and barriers. Which answer is indicated by the second characteristic numeral?
The degree of protection against access of person’s finger/ back of hand to hazardous parts as well as against ingress of solid foreign objects
The degree of protection against ingress of water through enclosures and barriers
The degree of protection against direct contact
None of the above
In solar-thermal power plants, the solar energy is collected by thousands of , called heliostats, that reflect the sun’s energy to a single receiver atop a centrally located tower. The enormous amount of energy focused on the receiver is used to generate high temperature to melt salt. The hot molten salt is stored in a storage tank, and is used, when needed, to generate steam and drive the .
turbine generator
sun-tracking mirrors
solar photovoltaic
boiler
What benefits does a good business system bring?
Increase the revenue
Maximum cost reduction
Solve customer problems
A,B &
Choose all the correct answers that are true about the logic symbol:
A logic function is an equation that provides the functionality of each output in the circuit as a function of the inputs.
The logic function describes the operations that are necessary to produce the outputs listed in the truth table.
A logic function is used to describe a single output that can take on only the values 1 and 0.
If a circuit contains multiple outputs, then a logic function is needed for each output.
The is the quantity or condition that is measured and controlled. The is the quantity or condition that is varied by the controller so as to affect the value of the controlled variable. Normally, the controlled variable is the output of the system.
controlled variable
control signal
control system
controller
Select all the answers that are true about the logic function:
A logic function is an equation that provides the functionality of each output in the circuit as a function of the inputs.
A logic function is a graphical representation that provides the functionality of each output in the circuit as a function of the inputs.
A logic function describes the operations that are necessary to produce the outputs listed in the truth table.
A logic function is a graphical representation of the circuit that can be used in a schematic to show how circuits in a system interface to one another.
The IEC International Protection Code2 has standardized designations composed of the letters IP followed by two characteristic numerals, which describe the degree of protection offered by different types of enclosures and barriers. Which answer is indicated by the first characteristic numeral?
The degree of protection against access of person’s finger/ back of hand to hazardous parts as well as against ingress of solid foreign objects
The degree of protection against ingress of water through enclosures and barriers
The degree of protection against direct contact
None of the above
Select one (1) correct answer about the working principle of Diode:
The n side will have a large number of holes and very few electrons (due to thermal excitation) whereas the p side will have a high concentration of holes and very few electrons.
The n side will have a large number of electrons and very few holes (due to thermal excitation) whereas the p side will have a high concentration of electrons and very few holes.
The n side will have a large number of electrons and holes (due to thermal excitation) whereas the p side will have a high concentration of holes and very few electrons.
The n side will have a large number of electrons and very few holes (due to thermal excitation) whereas the p side will have a high concentration of holes and very few electrons.
Which of the following is NOT a recommended practice for preventing electrical accidents?
Avoiding the use of extension cords
Regularly inspecting electrical equipment
Using damaged electrical cords
Keeping electrical devices away from water sources
Continue the following sentence about the P-N junction: A P-N junction is the simplest form of the diode which behaves as ideally ...
short circuit when it is in reverse biased and behaves as ideally open circuit when it is in the forward biased
open circuit when it is in forward biased and behaves as ideally short circuit when it is in the reverse biased
short circuit when it is in forward biased and behaves as ideally open circuit when it is in the reverse biased
None of the above is correct.
In the diffusion process, free ...(1)... from the n side will diffuse (spread) into the p side and combine with ...(2)... present there, leaving a positive immobile (not moveable) ion in the n side. Hence, few atoms on the p side are converted into negative ions.
(1): positive ions; (2): holes
(1): electrons; (2): holes
(1): negative ions; (2): electrons
(1): positive ions; (2): electrons
In the following motor, external resistance can be added to start the motor
Slip ring induction motor
Squirrel cage induction motor
Salient pole synchronous motor
Wound rotor synchronous motor
Continue the sentence: In a PN junction diode when the forward voltage is applied, which means...:
positive terminal of a source is connected to the n-type side, and the negative terminal of the source is connected to the p-type side; the diode is said to be in forward biased condition.
positive terminal of a source is connected to the p-type side, and the negative terminal of the source is connected to the n-type side; the diode is said to be in reversed biased condition.
positive terminal of a source is connected to the p-type side, and the negative terminal of the source is connected to the n-type side; the diode is said to be in forward biased condition.
None of the above is correct.
Which of the following is correct when saying this √ 푥 + 푦
The square root of the sum of x plus y
The square of the sum of x plus y
The square root of x plus y
The square of x plus y
Which of the following is correct?
In the series circuits, if one bulb burns out, the other bulbs in the rooms still work.
In the parallel circuits, if one bulb burns out, the other bulbs in the rooms still work.
In the parallel circuits, if one bulb burns out, the other bulbs in the rooms do not work.
None of the above
In the forward bias arrangement of a p-n junction diode,
The n-end is connected to the positive terminal of the battery
The p-end is connected to the positive terminal of the battery
The direction of current is from n-end to p-end in the diode
The p-end is connected to the negative terminal of the battery
Which of the following is true about the logic waveform:
A logic waveform is a graphical depiction of the logic symbol.
A logic waveform is a graphical representation of the output to the inputs. .
A logic waveform is a graphical depiction of the relationship of the output to the inputs with respect to time.
A logic waveform is an equation that provides the functionality of each output in the circuit as a function of the inputs.
