c05b

1

Reversing the DC current flow through an electrical coil will _____.

1

A device which prints out a permanent record of the plant operating conditions is known as the _________.

1

Engine room watch officers should keep a constant check on the loads carried by electric motors because _____.

1

The torque produced by a motor when the shaft will not turn, even though rated voltage is applied to the stator, is known as ___.

1

An operating characteristic appearing on the name plates of shipboard AC motors is____.

1

Which of the following operating characteristics for DC motors is considered to give high starting torque?

1

What type of electric motor is commonly used to start small auxiliary diesel engines?

1

In a compound-wound motor, a portion of the line current flows through the ____.

1

An advantage of DC motors over AC motors is that they ______.

1

The cycle per second developed by the alternator aboard your vessel is determined by ____.

1

One important difference between wye-connected and delta-connected generators is that delta connections have ____.

1

A DC generator which is used to supply direct current in order to maintain an AC generator field is commonly known as a/an ______.

1

DC generator circuits are protected against malfunctions due to prime mover power loss by the use of ____

1

Armature cores in a DC generator are made of laminated steel sheets to ___.

1

Modern DC generators are fitted with commutating poles to ____.

1

The simplest method of controlling the terminal voltage of compound-wound DC generator is with a ____.

1

Which of the terms listed best describes a compound wound DC generator having a higher voltage at no load than at full load?

1

Which of the following losses is/are present in every direct current generator armature?
I. Winding copper loss
II. Core eddy current loss
III. Magnetic hysteresis loss

1

Regarding an induction motor, the output power developed is related to the ____.

1

The difference between the synchronous speed of a three phase induction motor and its operating speed is called slip and may be correctly expressed as ___.

1

The speed of a squirrel cage induction motor is determined by the ____.

1

The most practical method of controlling the RPM of a step-speed AC motor is to ____..

1

Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine ____.

1

The division of kilowatt load between two paralleled alternators is determined by the ____.

1

The load sharing characteristics of two diesel alternators operating in parallel are directly related to the setting of their governors’_____.

1

Kilowatt load is divided between two AC generators operating in parallel by ____.

1

The division of the reactive KVA load between paralleled AC generators is initiated by the ____.

1

After closing the circuit breaker to place tow similar alternators in parallel, the NEXT step is to balance the _____.

1

If the energy input is significantly reduced to the prime mover of one ship board alternator operating in parallel with others, that alternator will ___.

1

When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer rotating in ____.

1

A change in field excitation of an alternator operating in parallel will cause a change in its _____________.

1

The purpose of squirrel-cage windings in a synchronous motor is to ___.

1

Amortisseur windings are installed in a synchronous motor to ___.

1

A common source of field excitation for synchronous motors is a/an ______.

1

An increase in which of the listed conditions will increase the speed of synchronous electric motor?

1

The speed of a synchronous motor is varied by ____.

1

What is the approximate voltage per cell produced by the nickel-iron (Edison) battery?

1

Common nickel-cadmium and nickel-iron storage batteries utilize _____.

1

What is the approximate discharge voltage produced by one cell of a wet type nickel-cadmium battery?

1

The capacity of a storage battery is measured in ____.

1

Local action in a dry-cell, or lead storage battery is the process whereby ____.

1

When mixing electrolyte, which if the following precautions should always be observed?

1

The normal open-circuit voltage of one cell of a fully charged lead-acid battery is ____.

1

When lead-acid batteries are charging, they always give off hydrogen gas that is ____.

1

When charging lead-acid batteries the charging rate should be reduced as the battery nears its full charge to ____.

1

When a lead-acid battery gassing freely while receiving a normal charge, the charging current should be ____.

1

Violent gassing developed by a lead-acid battery during charging indicates that the ____.

1

A nickel-cadmium battery is receiving a normal charge and gases freely. The charging current should ____.

1

Battery charging rooms should be well ventilated because the charging process produces ____.

1

Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an ____.

1

The arc resulting from the tripping of a circuit breaker is prevented from damaging the contacts by _____.

1

Electrical circuits are protected against overheating by means of a/an ___.

1

The 24 volt DC bus on the emergency switchboard is used to supply power to the ___.
I. gyrocompass power failure alarm system
II. smoke detection system
III. general alarm system

1

As storage battery for an emergency lighting and power system must have the capacity to ____.

1

Regulations require emergency diesel engine starting systems to have sufficient capacity to provide power for at least ____.

1

The source of emergency lighting and power at loss of normal ship’s power on a cargo vessel should be obtained from the ____.

1

An emergency generator driven by an internal combustion engine, shall be tested under load for a minimum of 2 hours at least once evry ___.

1

A bus disconnect link is used to isolate ___.

1

A ‘dead front’ switchboard is one ____.

1

Which of the following statements identifies the difference between the primary windings and the secondary windings of a 2:1 step down transformer?

1

Increasing the load on the secondary windings of a transformer will cause a/an _____.

1

Power transformers are rated in _____.

1

Relative to the secondary winding of a step-up transformer, the primary winding will have ____.

1

When a transformer is used to step-down voltage, the low voltage winding is ___.

1

In a three-phase, open-delta connected transformer, the line current is equal to ____.

1

Transformers are used onboard ships with AC generators to ____.

1

Which of the listed transformers uses a single winding to produce voltage transformation?

1

A transformer works on the basic principle of ____.

1

The basic operating principle of a transformer is attributed to ___.

1

If a transformer is connected to a DC source, the transformer will overload at the _____.

1

Transformer cores are laminated to reduce ____.

1

A transformer in an electric circuit serves to ___.

1

In an alternating current electrical system, a low system power factor is a direct sign of ____.

1

Voltage will always lead current in a/an_____.

1

When the voltage and the current developed in an AC circuit reach their peak values at the same time, the power factor is considered to be _____.

1

When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is ___.

1

Capacitors can be used in electric distribution systems to improve power factor. This is accomplished by seesawing energy between the capacitor and the ____.

1

Which of the following types of motors can be used for correcting power factor during normal operation?

1

Which of the substances listed can be used to shield sensitive equipment from static magnetic fields?

1

The purpose of a magnetic relay is to ______.

1

Incandescent lamps are classified according to ____.
I. shape of bulb and type of service
II. size and style of base
III. operating voltage and wattage

1

An adjustable resistor, whose resistance can be changed without opening the circuit in which it is connected, is called a ____.

1

A milliammeter with a full scale deflection reading of 100 milliamps is known to have an accuracy of plu or minus 2%. A meter reading of 5 milliamps would indicate a line current of between _____.

1

A DC ammeter would normally be connected ______.

1

If the approximate voltage to be measured in an electric circuit is not known, you should _____.

1

The resistance value of a resistor in a circuit can best be determined by the ______.

1

The basic “control action” of a magnetic amplifier is dependent upon _____.

1

A general purpose electrical multimeter can be used to directly measure ____.

1

The Wheatstone bridge is a precision measuring instrument utilizing the principle of changes in ____.

1

The RPM of an AC generator can be measured with a/an _____.

1

The shunt of a DC ammeter should be connected in _____.

1

Which of the following statements represents the correct method of connecting the shunt of an ammeter prior to taking a reading?

1

Which of the following meters uses a shunt connected in series with the load, but parallel with the meter movement?

1

External shunts are sometimes used with ammeters to _____.

1

A millimeter, with a full scale deflection reading of 100 milliamps, is known to have an accuracy of plus or minus 20%. A meter reading of 10 milliamps would indicate a line current of between _____.

1

An ammeter reads slightly ‘zero’ when its lead are disconnected, this is a result of ______.

1

When a resistor is used as a shunt and is connected in parallel with a meter movement coil, it will provide _____.

1

A galvanometer is an instrument used to measure ____.

1

To limit the current flow through a DC, voltmeter to as low a value as possible, the moving coil is provided with a/an ____.

1

AC voltmeters are generally calibrated to read the ____.

1

Most AC voltmeters are calibrated to indicate ____.

1

Conductor resistance may be INDIRECTLY measured by using a/an______.

1

Which of the following statements regarding the use of a current measuring instrument is correct ?

1

Handheld electrical phase sequence indicators are useful when ____.

1

Modern handheld non-contact digital tachometers operate by counting light pulses returned to the unit by _____.

1

A handheld reflective digital tachometer could give a false reading it ____.

1

Electrostatic forces in high voltage circuits cause indicating instruments to give ____.

1

Fuses are usually rated in ___.

1

Time delayed or delayed action-type fuses are designed to ___.

1

In a cartridge-type fuse, the metal element is contained in a ____.

1

Fuses placed in series with a thermal trip-type circuit breaker are used for ____.

1

The energy consumed by AC motor, as strictly reactive power, is _____.

1

A constant output voltage from an AC generator is maintained by the ___.

1

The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage ____.

1

Prior to starting an AC generator prime mover, the voltage regulator selector switch should be placed in the ___.

1

Which is a function of the voltage regulators used with AC generators?

1

The life expectancy of electrical insulation, is approximately hal;ved for an increased operating temperature of ___.

1

If a pointer on a megger fails to return to ‘zero’ when not being used, the ____.

1

A multimeter may be damaged by taking a ___.

1

In order to safely carry out repairs to a generator circuit breaker, it must be isolated from the bus. This accomplished by opening the ___.

1

When replacing fuses, always make sure ___.

1

When working on electrical circuits containing large capacitors, in addition to de-energizing the circuit, which of the listed precaution should also be taken?

1

The third color band on a resistor is used to indicate the_______.

1

Which of the listed conditions describes the effect on intrinsic semiconductor operation as a result of a temperature increase?

1

A signal derived from a controlled function and returned to the initiating point is called a/an_____.

1

Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components?

1

The method used to produce electron emission in most vacuum tubes is known as______.

1

In electronic circuitry, the abbreviation 'PCB' commonly means________.

1

Which of the following statements concerning analog and digital devices are correct?

1

Which of the following statements correctly applies to transistors?

1

A silicon controlled rectifier (SCR) is a solid state device used to change_______.

1

Silicon diodes which are designed for a specific reverse breakdown voltage, and are most often used in electronic power supply voltage regulators, are called________.

1

Which of the listed devices may be used as a digital device?

1

A triac thyristor functions as a control device and basically functions as______.

1

The purpose of a heat sink, as frequently used with transistors, is to______.

1

In process control terminology, continuously variable values which change without distinct increments, such as temperature, pressure, or level are called_______.

1

Increasing the power source frequency in a capacitive circuit will_____.

1

An operational amplifier, as used in today's consoles, may have a calculated gain of 5. This means that as the input changes by______.

1

An operational amplifier, as used in today's consoles, has a calculated gain of 5. This means that when the input changes______.

1

Heat sinks are most frequently used with_____.

1

Which of the listed conditions is an advantage of a PN diode over a vacuum diode?

1

The schematic symbol for an operational amplifier in an analog circuit is a______.

1

Which of the listed conditions is an advantage of a PN diode over a vacuum diode?

1

In a logic circuit, the NOT gate function______.

1

How many possible states does a binary logic circuit have?

1

In a logic circuit the NOR and NAND gate functions______.

1

Which of the listed logic gates is considered to be a BASIC building block (basic logic gate) used in logic diagrams?

1

In a diesel electric plant, raising the AC generator's field excitation will cause the DC propulsion motor to______.

1

Equipment for dc propulsion drive systems usually includes_________.

competency Quiz on c05b, created by mrk nthny on 15/08/2016.

c05b

Reversing the DC current flow through an electrical coil will _____.

A device which prints out a permanent record of the plant operating conditions is known as the _________.

Engine room watch officers should keep a constant check on the loads carried by electric motors because _____.

The torque produced by a motor when the shaft will not turn, even though rated voltage is applied to the stator, is known as ___.

An operating characteristic appearing on the name plates of shipboard AC motors is____.

Which of the following operating characteristics for DC motors is considered to give high starting torque?

What type of electric motor is commonly used to start small auxiliary diesel engines?

In a compound-wound motor, a portion of the line current flows through the ____.

An advantage of DC motors over AC motors is that they ______.

The cycle per second developed by the alternator aboard your vessel is determined by ____.

One important difference between wye-connected and delta-connected generators is that delta connections have ____.

A DC generator which is used to supply direct current in order to maintain an AC generator field is commonly known as a/an ______.

DC generator circuits are protected against malfunctions due to prime mover power loss by the use of ____

Armature cores in a DC generator are made of laminated steel sheets to ___.

Modern DC generators are fitted with commutating poles to ____.

The simplest method of controlling the terminal voltage of compound-wound DC generator is with a ____.

Which of the terms listed best describes a compound wound DC generator having a higher voltage at no load than at full load?

Which of the following losses is/are present in every direct current generator armature? I. Winding copper loss II. Core eddy current loss III. Magnetic hysteresis loss

Regarding an induction motor, the output power developed is related to the ____.

Which of the following losses is/are present in every direct current generator armature?
I. Winding copper loss
II. Core eddy current loss
III. Magnetic hysteresis loss