默认题库 - 船舶电气与船舶安全

单选题

A motor enclosure which protects against falling liquids is classified as （）

A. waterproof
B. drip proof
C. spray tight
D. spray proof

单选题

A. injection lag
B. ignition delay
C. compression
D. turbulence lag

单选题

A. portable tools
B. large pump motors
C. turbo electric main motors
D. forced draft fa

单选题

A. normal operation
B. a dirty commutator
C. increased brush capacity
D. water vapor absorptio

单选题

A. high mica condition
B. low ambient temperature
C. clogged ventilation ducts
D. an open in the shunt field

单选题

A. (1) only
B. (2) only
C. either (1) or (2)
D. neither (1) or (2)

单选题

A. （1）only
B. （2）only
C. either（1）or（2）
D. neither（1）or（2）

单选题

A. wasted energy
B. efficient operation
C. a short in the exciter field windings
D. an excessive number of minor system ground

单选题

A. ohms
B. volts
C. amps
D. watt

单选题

A. Inefficient scavenging；twice
B. Inefficient scavenging；1~8 times
C. Fewer strokes in a circle；twice
D. Fewer strokes in a circle；1~8 time