Liquid Fuels Volume 2
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Liquid Fuels Volume 2 CerTest
Questions and Answers
- 1.
A magnet that is magnetized by induction from an external source is called?
- A.
External Magnet
- B.
An artifical magnet
- C.
U magnet
- D.
Internal Magnet
Correct Answer
B. An artifical magnetExplanation
A magnet that is magnetized by induction from an external source is called an artificial magnet. This term is used to distinguish it from natural magnets, which are found in nature. Artificial magnets are created by applying an external magnetic field to a material that is not naturally magnetic. This process aligns the magnetic domains within the material, creating a magnet with a north and south pole.Rate this question:
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- 2.
What best descibes a schematic diagram?
- A.
Called a one line diagram, not usefull for trouble shooting
- B.
Called a one line diagram, very usefull for trouble shooting
- C.
Called a 2 line diagram, not usefull for troubleshooting
- D.
Called a 2 line diagram, very useful for trouble shooting
Correct Answer
B. Called a one line diagram, very usefull for trouble shootingExplanation
A schematic diagram, also known as a one line diagram, is a visual representation of an electrical system or circuit. It uses symbols and lines to show the connections and components in a simplified manner. This type of diagram is extremely useful for troubleshooting purposes as it provides a clear overview of the system, allowing technicians to quickly identify and locate any potential issues or faults.Rate this question:
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- 3.
How much current flow is in a circuit with 24 volts applied and with 72 OHMS resistance
- A.
.3 ampers
- B.
.33 ampers
- C.
.02 ampers
- D.
.22 ampers
Correct Answer
B. .33 ampersExplanation
The current flowing in a circuit can be calculated using Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage is 24 volts and the resistance is 72 ohms. Therefore, the current can be calculated as 24 volts divided by 72 ohms, which equals 0.33 amperes.Rate this question:
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- 4.
The joint resistance of a parallel circuit is equal to the applied voltage divided by what
- A.
Voltage
- B.
Resistance
- C.
Total Current
- D.
Conductivity
Correct Answer
C. Total CurrentExplanation
In a parallel circuit, the total current is the sum of the individual branch currents. The joint resistance of the circuit is equal to the applied voltage divided by the total current flowing through the circuit. Therefore, the correct answer is Total Current.Rate this question:
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- 5.
How is the measurement of the apparent power an of AC electrical system expressed
- A.
Amperes
- B.
OHMS
- C.
Farads
- D.
Kilovolt-amperes
Correct Answer
D. Kilovolt-amperesExplanation
The measurement of the apparent power in an AC electrical system is expressed in kilovolt-amperes. This unit represents the total power consumed by the system, taking into account both the real power (measured in kilowatts) and the reactive power (measured in kilovars). It is a measure of the total power flow in the system, including both the active and reactive components.Rate this question:
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- 6.
What unit of measurement is used when calculating the inductance of a coil
- A.
Henry
- B.
Farad
- C.
Kilovolts
- D.
Amps
Correct Answer
A. HenryExplanation
The unit of measurement used when calculating the inductance of a coil is Henry. Inductance is a property of an electrical circuit that opposes changes in current. It is measured in Henry, named after the physicist Joseph Henry, and is represented by the symbol H.Rate this question:
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- 7.
A 110-volt AC motor reads 20 inline amperes, and the inline voltmeter shows only 1,936 being consumed, what is the power factor of the AC Circuit
- A.
70% pf
- B.
78% pf
- C.
80% pf
- D.
88% pf
Correct Answer
D. 88% pfExplanation
The power factor of an AC circuit is a measure of how effectively the circuit converts electrical power into useful work. It is the ratio of the real power (watts) to the apparent power (volt-amperes) in the circuit. In this question, the real power consumed by the motor is given as 1,936 watts and the apparent power can be calculated by multiplying the voltage (110 volts) by the current (20 amperes), which equals 2,200 volt-amperes. Therefore, the power factor can be calculated as 1,936/2,200 = 0.88, or 88% pf.Rate this question:
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- 8.
What type of generator has bushings riding ont he commutator to carry the current to a external circuit
- A.
AC Type
- B.
DC type
- C.
AC/DC Type
- D.
All the above
Correct Answer
B. DC typeExplanation
A DC type generator has bushings riding on the commutator to carry the current to an external circuit. This is because in a DC generator, the commutator is responsible for converting the alternating current produced by the generator into direct current, which can then be used by an external circuit. AC and AC/DC generators do not have a commutator, so they do not require bushings for current transfer. Therefore, the correct answer is DC type.Rate this question:
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- 9.
What is the open circuit voltage of a lead- acid storage battery
- A.
.2 volts
- B.
2 volts
- C.
2.2 volts
- D.
2.22 volts
Correct Answer
C. 2.2 voltsExplanation
The open circuit voltage of a lead-acid storage battery is 2.2 volts.Rate this question:
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- 10.
What is the primary voltage of a transformer that has a secondary voltage of 240 volts and is rated 1-3 turn ratio
- A.
70 volts
- B.
75 volts
- C.
80 volts
- D.
85 volts
Correct Answer
C. 80 voltsExplanation
The primary voltage of a transformer can be calculated by multiplying the secondary voltage by the turn ratio. In this case, the turn ratio is 1-3, which means that for every 3 turns in the secondary coil, there is 1 turn in the primary coil. Therefore, the primary voltage is 3 times the secondary voltage. Since the secondary voltage is given as 240 volts, the primary voltage would be 3 times that, which is 720 volts. None of the given answer options match this calculation, so it seems that the correct answer is not provided.Rate this question:
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- 11.
What item is not a part of a DC motor
- A.
Bushings
- B.
External windings
- C.
Stator
- D.
Throttle bushing
Correct Answer
C. StatorExplanation
The stator is not a part of a DC motor. A DC motor consists of several components, including bushings, external windings, and a throttle bushing. The stator, on the other hand, is a part of an AC motor, not a DC motor. It is the stationary component that surrounds the rotor and generates a magnetic field to induce movement in the rotor.Rate this question:
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- 12.
The magnetic feild of a 3 phase motor rotor is caused by
- A.
Current flow in the rotor
- B.
Resistance in the rotor
- C.
Current flow on the stator
- D.
Resistance to the stator
Correct Answer
A. Current flow in the rotorExplanation
The magnetic field of a 3 phase motor rotor is caused by the current flow in the rotor. When current flows through the rotor windings, it creates a magnetic field that interacts with the stator's magnetic field, resulting in the rotation of the motor. The resistance in the rotor does not directly cause the magnetic field, but it affects the current flow in the rotor. The current flow on the stator is responsible for creating the stator's magnetic field, which interacts with the rotor's magnetic field to generate torque. Resistance to the stator is not relevant to the generation of the magnetic field in the rotor.Rate this question:
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- 13.
In what way does a DC Shunt motor have the feild coils and armature connected
- A.
In series
- B.
In parrallel
- C.
Opposite
- D.
Together
Correct Answer
B. In parrallelExplanation
A DC shunt motor has the field coils and armature connected in parallel. This means that the field coils and armature are connected to the same power supply, but they have separate paths for the current to flow. This configuration allows the motor to operate efficiently and produce a constant speed, as the field coils create a magnetic field that interacts with the armature to generate motion.Rate this question:
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- 14.
What is the power in watts consumed by a circuit with 120 volots applied and a resistance of 12 ohms
- A.
12 watts
- B.
120 watts
- C.
1,200 watts
- D.
12,000 watts
Correct Answer
C. 1,200 wattsExplanation
The power consumed by a circuit can be calculated using the formula P = V^2/R, where P is the power in watts, V is the voltage in volts, and R is the resistance in ohms. In this case, the voltage is 120 volts and the resistance is 12 ohms. Plugging these values into the formula, we get P = (120^2)/12 = 1,200 watts.Rate this question:
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- 15.
What should you connect and how, to operate a single phase dual voltage motor on high voltage
- A.
Run windings in parrallel
- B.
Run windings in series
- C.
Stator in parrallel
- D.
Stator in series
Correct Answer
B. Run windings in seriesExplanation
To operate a single phase dual voltage motor on high voltage, the run windings should be connected in series. When the run windings are connected in series, the voltage across each winding is divided, allowing the motor to operate at a higher voltage. This configuration ensures that the motor receives the necessary voltage to run efficiently at high voltage.Rate this question:
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- 16.
The squirrel- cage winding has inductive reactance and is placed beneath what
- A.
The stator
- B.
The Bushings
- C.
The wound rotor section
- D.
The voltage supply
Correct Answer
C. The wound rotor sectionExplanation
The squirrel-cage winding is a part of the rotor in an induction motor. It consists of conductive bars that are shorted at the ends, creating a closed loop. When the stator's magnetic field interacts with the rotor, an electromagnetic induction occurs, generating a rotating magnetic field in the rotor. The squirrel-cage winding, located in the wound rotor section, plays a crucial role in this process by providing inductive reactance, which helps in the creation of the rotating magnetic field. Therefore, the correct answer is the wound rotor section.Rate this question:
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- 17.
What motor requires some starting
- A.
Single phase DC motor
- B.
Dual phase DC motor
- C.
Single phase AC motor
- D.
Dual phase AC motor
Correct Answer
C. Single pHase AC motorExplanation
A single phase AC motor requires some starting mechanism because it only has a single phase power supply. Unlike three-phase motors that can start on their own due to the rotating magnetic field created by the three-phase power supply, a single phase AC motor needs an external starting mechanism such as a capacitor or a centrifugal switch to create the initial rotating magnetic field required for starting.Rate this question:
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- 18.
What are the characteristics of a 3 phase motor
- A.
Single voltage
- B.
Dual voltage
- C.
Thriple voltage
- D.
Either single or dual voltage motors
Correct Answer
D. Either single or dual voltage motorsExplanation
The characteristics of a 3 phase motor can include being single voltage, dual voltage, or even triple voltage. This means that the motor can be designed to operate with either a single voltage or dual voltage power supply, depending on the specific requirements of the application. The flexibility to accommodate different voltage options makes these motors versatile and suitable for a wide range of industrial and commercial applications.Rate this question:
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- 19.
An indication of an open rotor in a squirrel cage motor is?
- A.
Excessive heat
- B.
Loud noise
- C.
The motor slowing under load
- D.
All the above
Correct Answer
C. The motor slowing under loadExplanation
The indication of an open rotor in a squirrel cage motor is the motor slowing under load. When the rotor is open, it means there is a break in the circuit, causing a loss of power and reducing the motor's ability to maintain speed and perform under load. This can result in a noticeable decrease in motor performance and the motor struggling to maintain its normal speed when subjected to a load.Rate this question:
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- 20.
The internal windings of all 3 phase motors are
- A.
Wye connected
- B.
Delta connected
- C.
Either wye or delta connected
- D.
None of the above
Correct Answer
C. Either wye or delta connectedExplanation
The internal windings of 3 phase motors can be either wye or delta connected. This means that the windings can be connected in a wye configuration, where all three ends of the windings are connected together, or in a delta configuration, where the windings are connected in a triangular shape. The choice of connection depends on the specific motor design and application requirements. Therefore, the internal windings of 3 phase motors can be connected in either wye or delta configuration.Rate this question:
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- 21.
Kirchoff's voltage law states that
- A.
The sum of voltages around a close loop must equal applied voltage
- B.
The sum of voltages around a open loop must equal applied voltage
- C.
The sum of voltages around a closed loop must equal zero
- D.
The sum of voltages around a open loop must equal zero
Correct Answer
C. The sum of voltages around a closed loop must equal zeroExplanation
Kirchoff's voltage law states that the sum of voltages around a closed loop must equal zero. This means that in a closed electrical circuit, the total voltage drops across all the components (such as resistors, capacitors, and batteries) must add up to zero. This law is based on the principle of conservation of energy, where the total energy supplied by the voltage source is equal to the total energy consumed by the components in the circuit.Rate this question:
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- 22.
What completes an electrical cycle of an AC generator
- A.
1 positive and 1 negative alteration
- B.
2 postive and 1 negative alteration
- C.
1 positive and 2 negative alteration
- D.
2 positive and 2 negative alteration
Correct Answer
A. 1 positive and 1 negative alterationExplanation
An electrical cycle of an AC generator is completed by one positive and one negative alteration. This means that the generator produces alternating current, where the direction of the current changes periodically. The positive alteration represents the current flowing in one direction, while the negative alteration represents the current flowing in the opposite direction. Together, these alterations form a complete cycle of the alternating current produced by the generator.Rate this question:
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- 23.
The end play of a motor should not exceed what?
- A.
1 inch
- B.
3/4 inch
- C.
1/10 inch
- D.
1/64 inch
Correct Answer
D. 1/64 inchExplanation
The end play of a motor should not exceed 1/64 inch. This means that there should be minimal movement or play in the motor's components, specifically at the end of the motor shaft. Exceeding this limit can lead to issues such as misalignment, increased friction, and potential damage to the motor. Therefore, it is important to ensure that the end play is within the specified tolerance to maintain the motor's performance and longevity.Rate this question:
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- 24.
The method used to open the contacts on a across the line magnetic controller are?
- A.
Flipping the breaker
- B.
Spring tension and gravity
- C.
With a screwdriver
- D.
Applied voltage
Correct Answer
B. Spring tension and gravityExplanation
The method used to open the contacts on an across the line magnetic controller is through spring tension and gravity. This means that the contacts are held closed by a spring, and when the controller is activated, the spring tension is released, allowing the contacts to open due to the force of gravity. This method ensures a smooth and reliable opening of the contacts, allowing for efficient control of the electrical circuit.Rate this question:
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- 25.
The device used in most magnetic across the line motor controllers to reduce chater is
- A.
Flexible coupling
- B.
Non spark throttle bushings
- C.
Shaded rings
- D.
Stator cover
Correct Answer
C. Shaded ringsExplanation
Shaded rings are used in most magnetic across the line motor controllers to reduce chatter. Shaded rings are copper or aluminum rings placed on the surface of the motor's stator. These rings create a magnetic field that helps to stabilize the motor's rotation and reduce vibration and noise. By reducing chatter, shaded rings improve the overall performance and efficiency of the motor controller.Rate this question:
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- 26.
What publication provides detailed procedures on blocking and tagging electrical circuits
- A.
AFI-32-1064
- B.
AFI-24-6432
- C.
AFI-31-1032
- D.
AFI-22-9966
Correct Answer
A. AFI-32-1064Explanation
AFI-32-1064 is the correct answer because it is a publication that provides detailed procedures on blocking and tagging electrical circuits. This publication would likely contain information on how to safely secure and label electrical circuits to prevent accidental energization during maintenance or repair work. The other options, AFI-24-6432, AFI-31-1032, and AFI-22-9966, do not specifically mention blocking and tagging electrical circuits, making them incorrect choices.Rate this question:
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- 27.
What determines the intensity of excess pressure in a motor hammer wave
- A.
Amount of current
- B.
Amount of estinguished volecity
- C.
Amount of Resistance
- D.
Amount of Protons
Correct Answer
B. Amount of estinguished volecityExplanation
The intensity of excess pressure in a motor hammer wave is determined by the amount of extinguished velocity. This means that the higher the extinguished velocity, the greater the intensity of excess pressure in the wave. The other options, such as amount of current, amount of resistance, and amount of protons, are not relevant factors in determining the intensity of excess pressure in a motor hammer wave.Rate this question:
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- 28.
What is used to move electrons to perform a useful job
- A.
Current
- B.
Voltage
- C.
Resistance
- D.
Ohms
Correct Answer
B. VoltageExplanation
Voltage is the electrical force that pushes electrons through a circuit, allowing them to flow and perform a useful job. It is the potential difference between two points in a circuit that causes the movement of electrons. Without voltage, there would be no flow of electrons and no useful work could be done. Therefore, voltage is used to move electrons and enable the performance of a useful job in an electrical circuit.Rate this question:
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- 29.
What type of diagram makes use of diagram symbols instead of pictures to show components
- A.
Detail
- B.
Cross- Sectional
- C.
Connection
- D.
As Built
Correct Answer
C. ConnectionExplanation
A diagram that makes use of diagram symbols instead of pictures to show components is called a "connection" diagram. This type of diagram is commonly used in engineering and technical fields to represent the connections between different components or elements of a system. It helps to illustrate the relationships and interactions between these components in a clear and concise manner, without the need for detailed illustrations or photographs.Rate this question:
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- 30.
How is mechanical advantage determined
- A.
MA= resistance x effor
- B.
MA= resistance / effort
- C.
MA= work x effort
- D.
MA= work / resistance
Correct Answer
B. MA= resistance / effortExplanation
The mechanical advantage is determined by dividing the resistance by the effort. This means that the mechanical advantage is a ratio that represents how much the force applied is multiplied or reduced when overcoming a resistance. By dividing the resistance by the effort, we can determine how much easier or harder it is to move or lift an object.Rate this question:
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Current Version
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Nov 08, 2023Quiz Edited by
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Feb 03, 2010Quiz Created by
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