热工仪表初判断（Preliminary judgement of thermal instrument）.docVIP

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热工仪表初判断（Preliminary judgement of thermal instrument）.doc

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热工仪表初判断（Preliminary judgement of thermal instrument）

热工仪表初判断（Preliminary judgement of thermal instrument） Two 、 judgment questions 1. The total current in a series circuit is equal to the sum of current on each resistor. () Answer: X 2 、 the total resistance of series circuit is the sum of each resistor. () Answer: B. 3, usually in accordance with the direction of the magnet N pole refers to the direction of the magnetic line of force. () Answer: B. 4 usually the direction of the positive charge is the direction of the current. () Answer: B. 5, in the outside of the magnet, the direction of the magnetic field line always starts from the N pole back to the S pole, while in the magnet, the magnetic field line is from S to N pole. () Answer: B. 6. The direction of the electric field is the direction of the force acting on the positive charge in the electric field. () Answer: B. 7, reactive power, that is, useless power. () Answer: X 8 if the capacitance of the N series capacitors is the same, the voltage they are subjected to is equal, and the voltage on each capacitor is equal to the 1/n of the power supply voltage. () Answer: B. 9, two capacitors, a larger capacitance, a smaller capacitance, when the charge to the same voltage, the larger capacitance of the capacitor, the amount of electrification. () Answer: B. 10, exchange three-phase AC motor any two lines, will not affect its normal work. () Answer: X 11. The product of the instantaneous current and the instantaneous value of the voltage in the resistor is the instantaneous power consumed by the resistor. () Answer: B. 12, to assess the quality of temperature measuring instruments, the main technical indicators are the absolute maximum error size. () Answer: X 13. The absolute value of error is absolute error. () Answer: X The accuracy grade is 14, the accuracy of the instrument instrument to remove the sign. () Answer: B. 15, Chinas legal unit of measurement is based on the international system of units, combined with Chinas actual situation, the increase of som