井下电钳工试题-单选题(国外英文资料).docVIP

井下电钳工试题-单选题(国外英文资料) RadioButtonList [] Classification: professional knowledge Question: rated voltage underground remote control circuit, should not exceed ________. A.380V B.220V C.127V D.36V Answer: D Score: 1 Classification: professional knowledge Question: underground distribution voltage does not exceed the maximum ________. A.1140V B.6000V C.10000V D.3300V Answer: C Score: 1 Classification: professional knowledge Question: in the coal mine, for electricity, discharge, ground work requirements, gas concentration must be carried out in the following order ________. A.1% B.0.5% C.1.5% D.2% Answer: A Score: 1 Classification: professional knowledge Questions: power supply low voltage switch operation at the same time, should watch ________ instructions when the indicator is lower than the prescribed value, must be immediately cut off switch. A. leak relay insulation B. current C. voltage D. temperature Answer: A Score: 1 Classification: professional knowledge Test equipment: Ming experience after without electricity, discharge to the earth fully installed ground, must first meet ________. A. terminal conductor B. ground terminal Both ends can be C. At the same time D. Answer: B Score: 1 Classification: professional knowledge The test equipment of underground low voltage: rated voltage not exceeding ________. A.380V B.660V C.1140V D.3300V Answer: C Score: 1 Classification: professional knowledge Question: when the motor and switch locations within 20m gas density in the wind reached ________, must stop working, cut off the power supply, the withdrawal of personnel, processing. A.0.5% B.1% C.1.5% D.2.0% Answer: C Score: 1 Classification: professional knowledge Question: well into the explosion-proof equipment installation must be ________. A. product qualification certificate, certificate of proof B. product certification, mine products safety signs C. explosion-proof certification, mine product safety signs D. product certification, mine product safety signs and saf