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Fuses placed in series with a thermal trip-type circuit breaker are used for （）.
A . time-delay protection
B . short-circuit protection
C . short duration surge protection
D . sustained overload protectio
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In a series circuit, which value will remain unchanged at all places in the circuit?（）
A . Voltage
B . Current
C . Resistance
D . Inductance
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When the voltage remains constant and the resistance is increased in a series circuit, the flow of current （）
A . increases by the square of the original value
B . increases
C . remains the same
D . decrease
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A circuit that has one wire in contact with the hull of the ship is a（）
A . series circuit
B . grounded circuit
C . short circuit
D . closed circuit
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The output voltage of a three-phase alternator is regulated by the （）.
A . AC voltage to the armature
B . AC voltage to the field
C . DC voltage to the armature
D . DC voltage to the field
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The total power consumed in a parallel circuit is （）
A . the sum of the powers used in each load (resistor)
B . divided by the number of loads
C . always less than the power used in the smallest load
D . the sum of the powers used in each individual load never more than the power used in the largest load
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In motorships，there are two main circuits, （）.
A . one salt water, one fresh water
B . one salt water, one fuel
C . one fresh water, one fuel
D . one steam, one fuel
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Operational amplifiers, used primarily in analog circuits, are characterized by（）
A . high input impedance, high gain and low output impedance
B . high input impedance, high gain and high output impedance
C . low input impedance, low gain and high output impedance
D . low input impedance, high gain and low output impedance
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A customer has 2 DS1s to add between adjacent nodes in a UPSR ring. What type of circuit should you recommend?（）
A . VT circuits
B . STS circuits
C . VT tunnel circuits
D . 1:1 protection circuits
E . 1:N protection circuit
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A customer has 20 E1s to add between far-end nodes in an SNCP ring. What type of circuit would you recommend？（）
A . LO-PATH circuits
B . HO-PATH circuits
C . 1：1 protection circuits
D . 1：N protection circuits
E . LO-PATH tunnel circuit
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Click the Exhibit button. Within an ONS 15454, you are provisioning a circuit on an unprotected UPSR ring. In the exhibit, which two must you configure?（） (Choose two.)https://assets.asklib.com/images/image2/2018080113444978502.jpg
A . revertive
B . circuit type
C . circuit size
D . bidirectional
E . protected drops
F . switch on PDI-P
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A heater in the circuit facilitates warning of the engine prior to （） by circulating hot water.
A . starting
B . stopping
C . to start
D . to sto
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For practical purposes, in a simple series circuit, the source voltage will be dropped across one resistor if it has（）.
A、Drum.
B、Salient pole.
C、Squirrel-cage.
D、Wound-rotor.
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Open in TRC brake main relay circuit的中文意思是（）。
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A ground in an electrical circuit outside the engine room （）.
A . cannot be detected tinder normal conditions
B . is of no consequence to engineering personnel
C . is indicated at the branch circuit breaker panel
D . is indicated by the ground detecting lamps on the main switchboard
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A transformer in an electric circuit serves to （）
A . generate its own electrical power
B . transform electrical energy into mechanical energy
C . increase or decrease circuit voltage as required
D . convert AC current to DC current
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In a modern three-phase A-Csynchronous brushless generator, the excitation winding is on the rotorThat means （）.
A . The generator needs not excitation
B . The winding on the rotor is for inputting excitation current
C . There are three phase windings on the rotor
D . The generator has brushe
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In a simple series circuit, the entire source voltage will drop across （）
A、the resistor next to the negative terminal
B、a short circuit
C、the resistor next to the positive terminal
D、an open circuit
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in the common-emitter circuit with a voltage-divider bias, the ( ) of the Q-point are independent of β
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In the circuit, A，then __________ A, __________ A。http://p.ananas.chaoxing.com/star3/origin/5668d7ece4b0e85354a14fbd.gif
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How to judge if a circuit is in series?
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In a modern three-phase A.Csynchronous brushless generator, the excitation winding is on the rotorThat means _____.
A.The generator needs not excitation
B.The winding on the rotor is for inputting excitation current
C.There are three phase windings on the rotor
D.The generator has brushes
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Click the Exhibit button. Within an ONS 15454, you are provisioning a circuit on an unprotected UPSR ring. In the exhibit, which two must you configure？（） （Choose two.)
<img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/caeb03f6c8e10f9c4634f3ed4cfba37a.jpg' />
A. revertive
B. circuit type
C. circuit size
D. bidirectional
E. protected drops
F. switch on PDI-P
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Circuit-switching technology is used in Public Switched Telephone Network（PSTN）, Global System for Mobile Communications（GSM） and Code Division Multiple Access（CDMA）. It is a （） information transfer
A．Connectionoriented
B． connectionless
C． Highbandwidthutilization
D． Poor-real-time
