c05a

1

What is the maximum allowable primary current of a 2 KVA step - down transformer with a four to one turns ratio if connected across a 440 volt line?

1

The open-circuit voltage of a fully charged lead-acid battery cell is _______ .

1

A milliammeter, with a full scale deflection reading of 100 milliamps, is known to have an accuracy of + or - 2%. A meter reading of 10 milliamps would indicate a line current of between.

1

Basic electrical motor action depends on_______.

1

What is the function of damper windings in a synchronous motor ?

1

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

1

"The rated temperature rise of an electric motor is the_______.
.
"

1

The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the______.

1

Voltage generated by most AC generators is fed from the machine to the bus by means of ____ .

1

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

1

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

1

When reading electrical motor controller diagrams, it helps to know that________.

1

A device that utilizes the principle of electromagnetic induction is the______ .

1

Amortisseur windings are installed in a synchronous motor to_____.

1

Which of the following physical characteristics does a wound- rotor induction motor possess that a squirrel cage motor has none?

1

In an induction motor, rotor currents are circulated in the rotor by________.

1

Regarding an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated by the ________.

1

"A low voltage source is being used for testing armature coils. A
coil short circuit will be indicated by a ___________.
"

1

When measuring AC current flow, you must always connect the meter ___________.

1

To increase the frequency of an operating AC generator, you should __________.

1

An electrical device which prevents action from occurring until all other required conditions are met is called _______.

1

The main purpose of the auxiliary winding on a split-phase, single- phase motor is to_______ .

1

The heating of conductors as a result of resistance in a distribution circuit causes a power loss expressed as_______.

1

The greatest detrimental effect on idle electrical equipment, such as cargo pump motor is the_______.

1

"An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a_______.
.
"

1

"A circuit breaker differs from a fuse, in that a circuit breaker_________.
.
"

1

AC circuits possess characteristics of resistance, inductance, and capacitance. The capacitive reactance of a circuit is expressed in_____ .

1

The frequency output of an operating alternator is controlled by the______ . .

1

Which of the following types of motors is often designed for use in correcting power factor?

1

The purpose of a cage rotor winding placed on the rotor of a synchronous motor is to ________.

1

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

1

The capacity of a storage battery is measured in_______.

1

The rated temperature and rise of an electric motor is the ______.

1

"In an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated by the_______ .
.
"

1

What should you do to the charging current when a lead-acid battery gassing freely while receiving a normal charge?

1

External shunts are sometimes used with ammeters to _____.

1

What is a common method used to control the speed of the AC propulsion motor on a diesel-electric propulsion ship?

1

What keep the line losses in a distribution circuit at minimum?

1

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

1

In a compound-wound motor, where is a portion of the line current flows through?

1

How does the speed of a synchronous motor change?

1

Which of the following is the function of an automatic voltage regulators provided on main switchboards?

1

What will happen if you reverse the DC current flow through an electrical coil?

1

Power transformers are rated in _____.

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

The operating torque of the disk or timer element in an AC reverse power relay is obtained from _____.

1

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

1

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

1

Why is the engine room watch officers should keep a constant check on the loads carried by electric motors?

1

Which of the listed conditions could cause a recently overhauled DC motor to have excessively hot winding and sparking at the brushed?

1

Which of the following starting system should be carried out after overhaul of a motor?

1

What is the common source of field excitation for synchronous motors?

1

What is a component used to protect the DC generator circuits against malfunctions due to prime mover power loss?

1

Due to the operating characteristics of the system, time lag fuses (or dual-element fuses) are necessary for use in _______.

1

Equalization of the power factors of two alternators operating in parallel is accomplishedin what manner?

1

Which of the following electrical instrument is the safest to use in taking the current even without switching off or opening the circuit?

1

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

1

What will happen if connections on a DC shunt motor are changed on either the field connections, or the armature connections?

1

What is the purpose of DC generator brushes?

1

A switchboard for an AC electrical system requires the use of which of the following devices?

1

A bus disconnect link is used to isolate ___.

1

The purpose of a magnetic relay is to ______.

1

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

1

On an engine throttle control system, the auxiliary control circuits are provided with devices to prevent excessive over travel of the actuating valve by the control motor. What are these devices?

1

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

1

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

1

What inidicates a violent gassing developed by a lead-acid battery during charging?

1

When the non-essential load has been removed from the feeder system but the service generator remains overloaded, what device automatically activates?

1

What is the function of capacitors which are commonly used on power supply circuits for engine room automation consoles?

1

What do you call the device where a low input voltage is imparted to it which then delivers a high output voltage?

1

What electrical component intitiates the division of the reactive KVA load between paralleled AC generators?

1

The circuit power factor of an AC generator operating singularly is determined by the ____.

1

What do you call a torque produced by a motor when the shaft will not turn, even though rated voltage is applied to the stator?

1

What will happen if you reverse the DC current flow through an electrical coil?

1

Which of the following provides the initial torque to turn a DC generator?

1

The division of kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the ____.

1

On some diesel-electric ships, the DC propulsion motor will only attain half speed when the generator fields are fully excited. How should the speed above this be obtained?

1

What do you call a DC generator used to supply direct current in order to maintain an AC generator field?

1

Transformer cores are laminated to reduce ____.

1

To test the feeder system for grounding, the three earth lamps will be activated when this switch is manipulated.

1

A transformer works on the basic principle of ____.

1

What is the simplest method of controlling the terminal voltage of compound-wound DC generator?

1

Which of the following types of motor has two separate field windings usually connected in parallel with the armature circuit?

1

Which of the following types of motor whose speed at normal operation is constant or practically constant?

1

A circuit with a blown fuse would be described as _

1

How would you describe a circuit with a blown fuse?

1

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

1

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

1

What is the recommended practice on the frequency of the incoming machine prior to closing the breaker when paralleling two AC generators?

1

When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer rotating in what direction?

1

What is the characteristic of the mica used in the commutators of DC machinery?

1

Regarding an induction motor, where is the output power developed related to?

1

What type of AC single-phase motor will also operate on direct current?

1

What do you call an AC motor which uses rheostat in the motor circuit to vary the speed?

1

Which of the following is the most common of excitation for synchronous motor?

1

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

1

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

1

Which of the following electric motors would be the most reliable to use on the open main deck of a vessel?

1

When a megohmmeter is used to test the dielectric strength of wire insulation, what causes the intial dip of the pointer toward zero?

1

On a modern 13 amp square pin electric plugs, which of the following statements is true ?

1

The timer element of a reverse power relay will activate when ___

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

What determines the cycle per second developed by the alternator aboard your vessel?

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

What will happen if there is a change in field excitation of an alternator operating in parallel?

1

What is the advantage of DC motors over AC motors?

1

A galvanometer is an instrument used to measure ____.

1

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

1

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

1

In a running electric motor, why are we using a sound listening bar?

1

Why is an armature cores in a DC generator made of laminated steel sheets?

1

What will be the next step after closing the circuit breaker to place two similar alternators in parallel?

1

What is the reason why one of the generator or motor bearings generally insulated from the end housing?

1

Why is a modern DC generators fitted with commutating poles?

1

Why is there an amortisseur windings installed in a synchronous motor?

1

What is the function of the interpoles installed in DC motors?

1

What is the purpose of squirrel-cage windings in a synchronous motor?

1

When energizing a DC propulsion motor using Local override manual control, What should the variable resistor do?

1

What is an operating characteristic appearing on the name plates of shipboard AC motors?

1

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

1

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

1

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

1

How is kilowatt load divided between two AC generators operating in parallel?

1

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

1

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

1

How is the capacity of a storage battery being measured?

1

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

1

What is the simplest method of controlling the terminal voltage of compound-wound DC generator?

1

A ‘dead front’ switchboard is one ____.

1

When the feeder system has no ground fault, what does the pointer of the insulation resistance indicates

competency Quiz on c05a, created by mrk nthny on 14/08/2016.

c05a

What is the maximum allowable primary current of a 2 KVA step - down transformer with a four to one turns ratio if connected across a 440 volt line?

The open-circuit voltage of a fully charged lead-acid battery cell is _______ .

A milliammeter, with a full scale deflection reading of 100 milliamps, is known to have an accuracy of + or - 2%. A meter reading of 10 milliamps would indicate a line current of between.

Basic electrical motor action depends on_______.

What is the function of damper windings in a synchronous motor ?

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

"The rated temperature rise of an electric motor is the_______. . "

The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the______.

Voltage generated by most AC generators is fed from the machine to the bus by means of ____ .

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

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

When reading electrical motor controller diagrams, it helps to know that________.

A device that utilizes the principle of electromagnetic induction is the______ .

Amortisseur windings are installed in a synchronous motor to_____.

Which of the following physical characteristics does a wound- rotor induction motor possess that a squirrel cage motor has none?

In an induction motor, rotor currents are circulated in the rotor by________.

Regarding an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated by the ________.

"A low voltage source is being used for testing armature coils. A coil short circuit will be indicated by a ___________. "

When measuring AC current flow, you must always connect the meter ___________.

"The rated temperature rise of an electric motor is the_______.
.
"

"A low voltage source is being used for testing armature coils. A
coil short circuit will be indicated by a ___________.
"

"An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a_______.
.
"

"A circuit breaker differs from a fuse, in that a circuit breaker_________.
.
"

"In an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. These changes in armature reaction are compensated by the_______ .
.
"