更多"Inductance is the property of an el"的相关试题:
[单项选择]Capacitance is the property of an electric circuit opposing a change in the （）
A. current in the circuit
B. voltage in the circuit
C. inductance in the circuit
D. resistance in the circuit
[单项选择]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
[单项选择]The meat box temperature control circuit, as used in ship service refrigeration system, is an example of （）
A. two position control
B. signal speed floating control
C. proportional control
D. reset control
[单项选择]The total resistance of a parallel circuit is always （）.
A. larger than the greatest branch resistance
B. smaller than the lowest branch resistance
C. equal to the sum of the individual branch resistances
D. one-half the sum of the individual branch resistances
[单项选择]Line losses in a distribution circuit are kept to a minimum by （）.
A. adding rubber insulation conductors to the circuit
B. using higher current and lower voltage increasing the
C. number of thermal relays in the circuit
D. using higher voltage and lower current
[单项选择]For practical purposes, in a simple series circuit, the source voltage will be dropped across one resistor if it has（）.
A. half the resistance of the other resistor
B. a resistance equal to the other
C. at least ten times the resistance of the other
D. a partial short circuit
[单项选择]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 stop
[单项选择]The mode of control employed by an alarm circuit is a （）
A. two position control
B. signal speed floating control
C. proportional speed floating control
D. reset control
[单项选择]A circuit breaker and a fuse have a basic similarity in that they both （）.
A. can be reset to energize the circuit
B. should open the circuit when overloaded
C. will burn out when an over current flow develops
D. All of the above
[单项选择]In a series circuit, which value will remain unchanged at all places in the circuit?（）
A. Voltage
B. Current
C. Resistance
D. Inductance
[单项选择]When working on a high voltage circuit, you should always have another person present with you.This person should have a good working knowledge of （）
A. the circuit being worked on and the location of all switches and circuit breakers controlling it
B. first-aid techniques for treating electrical shock
C. cardiopulmonary resuscitation (CPR)
D. All of the above
[单项选择]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
[单项选择]Electric generators can be protected against overload（）.
A. With switches
B. With a governor on the engine
C. With fuses or circuit breakers
D. By using heavy wire
[单项选择]Electric insulation is made of organic substances and so gradually （） with age.
A. deteriorates
B. increases
C. are fouled
D. becomes better
[单项选择]Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to（）
A. higher speed required
B. flywheel-effect
C. lower starting temperatures
D. higher compression pressures
[单项选择]A circuit breaker differs from a fuse in that a circuit breaker （）.
A. melts and must be replaced
B. is enclosed in a tube of insulating material with metal ferrules at each end
C. gives no visual indication of having opened the circuit
D. trips to break the circuit and may be reset
[单项选择]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
[单项选择]A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter methodTherefore, the meters should be connected with（）.
A. both meters in series with the resistance
B. both meters in parallel with the resistance
C. the ammeter in series and the voltmeter in parallel with the resistance
D. the ammeter in parallel and the voltmeter in series with the resistance
