单选题The field coils（） and the armature is（）This is in fact the arrangement adopted for large, heavy duty alternators.Astationary；rotateBstationary；stationaryCrotate；stationaryDrotate；rotate
单选题
The field coils（） and the armature is（）This is in fact the arrangement adopted for large, heavy duty alternators.
A
stationary；rotate
B
stationary；stationary
C
rotate；stationary
D
rotate；rotate
参考解析
解析：
暂无解析
相关考题：
An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard as aA.magnetic amplifierB.ship's service alternatorC.three-wire DC generatorD.saturable core reactor
The field coils _____and the armature _____. This is in fact the arrangement adopted for large, heavy duty alternators.A.are stationary / rotatesB.are stationary /is stationaryC.rotate / is stationaryD.rotate / rotates
Which of the following components are used to convert alternating current produced in the generator windings to direct current?A.Armature and equalizerB.Commutator and brushesC.Rotor and interpolesD.Field and exciter
The field coils ______ and the armature(电枢) ______. This is in fact the arrangement adopted for large, heavy duty alternators.A.are stationary(固定的)/rotatesB.are stationary/is stationaryC.rotate/ is stationaryD.rotate/rotate
Which of the following statements is NOT true?（）AThe open field system provided a good opportunity to experiment.BThe open field system wasted land.CThe open field system was wasteful of labor and time.DThe open field system made livestock farming difficult.
Which of the following statements is NOT true?（）A、The open field system provided a good opportunity to experiment.B、The open field system wasted land.C、The open field system was wasteful of labor and time.D、The open field system made livestock farming difficult.
Yuri created a formula for a button. The code is supposed to set the value of an existing field called title. He used the following formula: title:= @propercase (title); after the foumula runs ,the title field is null. Why? （）A、the value of one field cannot be set from the value in another field B、the text string in the formula is set to null. Thus notes cannot validate the formula C、when setting the value of a field , the formula must be in the field‟s input validation event D、the formula does not specify that title is an existing field. Thus it is interpreted as a temporary variable
Which of the following is true about the MPLS header and its EXP field size？（）A、The MPLS header is 2 bytes，and the EXP field is 3 bits long.B、The MPLS header is 1 byte，and the EXP field is 3 bits long.C、The MPLS header is 4 bytes，and the EXP field is 3 bits long.D、The MPLS header is 3 bytes，and the EXP field is 3 bits long.
jim has created a field hint for the address field. Users tell him this text disappears when they click in the address field. which one of the following is most likely reason?（）A、 the address field is computed B、 jim should have used a text popup C、 jim stored the field hint in the database D、 field hint only display when the user has not clicked in the field （field hint）
You are developing a Windows Forms application that contains a DataGridView control. The DataGridView capture the customer's name, address, and phone number. You have been asked to provide data validation in a DataGridView to prevent users from leaving the.. You need to ensure that users cannot tab out of the name field without entering data What should you do ?（）A、Validate the name field in the CellValidating event. Set e.Cancel = true if the name field isB、Validate the name field in the CellErrorTextChanged event. Get e.RowIndex if the name field ..C、Validate the name field in the CellEnter event. Set the focus on the name field if the name ...D、Validate the name field in the CancelRowEdit event. Set the focus on the name field if the name ...
单选题Which of the following statements is NOT true?（）AThe open field system provided a good opportunity to experiment.BThe open field system wasted land.CThe open field system was wasteful of labor and time.DThe open field system made livestock farming difficult.
单选题If there were a fire in the bunker tanks, you would（）Aclose the ventBpump out the tankCactivate the fixed CO2 systemDcut off the heating coils
单选题If a voltmeter is connected across a line, it must be protected with a（）AshuntBhigh-resistance coil in the armature circuitClow-resistance coil in the armature circuitDshunt and a coil of high resistance
单选题The field coils（） and the armature is（）This is in fact the arrangement adopted for large, heavy duty alternators.Astationary；rotateBstationary；stationaryCrotate；stationaryDrotate；rotate
单选题jim has created a field hint for the address field. Users tell him this text disappears when they click in the address field. which one of the following is most likely reason?（）A the address field is computed B jim should have used a text popup C jim stored the field hint in the database D field hint only display when the user has not clicked in the field （field hint）
单选题An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a （）.Amagnetic amplifierBship’s service alternatorCthree-wire DC generatorDsaturable core reactor
单选题Adam Smith was a professor of philosophy, a commissioner of customs, and founded the field of modern economics.Aa commissioner of customs, and founded the field of modem economicsBworked as commissioner of customs, and founded the field of modern economicsCa commissioner of customs, and the founder of the field of modern economicsDcommissioned customs, and was the founder of the field of modern economicsEa commissioner of customs, and was the founder of the field of modem economics
单选题“380V/220V Y/△” noted on the nameplate of a non-synchronous motor means that（）Athe armature terminals of the motor should be connected in star formation when voltage of power supply is 380Bthe armature terminals of the motor should be connected in star formation when voltage of power supply is 220Cboth A and B are correctDthe armature terminals of the motor should be connected in reverse ways of A and B
单选题Yuri created a formula for a button. The code is supposed to set the value of an existing field called title. He used the following formula: title:= @propercase (title); after the foumula runs ,the title field is null. Why? （）Athe value of one field cannot be set from the value in another field Bthe text string in the formula is set to null. Thus notes cannot validate the formula Cwhen setting the value of a field , the formula must be in the field‟s input validation event Dthe formula does not specify that title is an existing field. Thus it is interpreted as a temporary variable
单选题To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？ （）AThe PRI field should contain the Cos value of 010BThe PRI field should contain the Cos value of 011CThe PRI field should contain the Cos value of 100DThe PRI field should contain the Cos value of 101EThe PRI field should contain the Cos value of 110FThe PRI field should contain the CoS value of 111
单选题The purpose of the commutator and brushes on a DC generator is to（）Achange AC to DCcurrentBchange DC to AC currentCneutralize a armature reactionDcarry current to the outside circuit
单选题Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）AA room thermostat activates an electric heater at each individual chilled air outlet when necessaryBVarying the number of passes the air makes across the coilsCVarying the temperature of the water through the coilsDVarying the quantity of water flowing through the coils
单选题The frequency of an alternator at a given RPM is determined by the （）.Anumber of turns of wire in the armature coilBnumber of magnetic polesCstrength of the magnets usedDoutput voltage
单选题DC generators are classified according to the manner in which（）Athey are usedBthe field windings are connected to the loadCthe armature circuit is connected to the loadDthe field windings are connected to the armature circuit
单选题The most common type of AC service generator found aboard ship is the stationary （）.Aelectromagnetic field, revolving armature typeBelectromagnetic field, oscillatory armature typeCarmature, oscillatory electromagnet field typeDarmature, rotating electromagnetic field type
单选题The thermal expansion valve responds to the（）Aamount of superheat in the vapor leaving the coilBamount of superheat in the liquidCtemperature in the evaporator coilsDpressure in the evaporator coils
单选题The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）AmanifoldBcondenserCchamberDplenum