Total score of the theoretical examination paper for intermediate workers in the electric power vocational skill appraisal exam "Substation Attendant" (No.123456) Note: Fill in the items on the left side of the binding line clearly before answering the questions. Answer sheets must use blue or black pens and ballpoint pens, not pencils or red pens. First, multiple-choice questions (please put the code of the correct answer in brackets, each question 1) 1. The basic working performance of inductance element is (). (a) consuming electric energy; (b) generating electrical energy; Store energy; (d) transmitting energy. Answer: C8. The heavy gas action of main transformer is caused by (). (a) circuit breakers on both sides of the main transformer trip; (b) Two-phase flashover of 220kV casing; (c) serious turn-to-turn short circuit of the high voltage side winding in the main transformer; (d) The main transformer shell is on fire. Answer: C9. The reading displayed by the AC measuring instrument is sinusoidal (). Effective value; (b) the maximum value; Average value; Instantaneous value Answer: A 1 1. When alternating current is applied to a conductor, the current density on the surface of the conductor (). (a) The density near the center of the conductor is high; (b) The density near the center of the conductor is low; (c) The same density as that near the center of the conductor; Uncertainty. Answer: A 19. The force on the electrified conductor in the magnetic field is (). Electric field force; Magnetic field force; Electromagnetic force; Gravity. Answer: C22. If the voltage of a single battery is () V, it is in a normal floating state. (1) 2.05 ~ 2.1; (B)2. 15 ~ 2.2； (C)2.25 ~ 2.3； (D)2. 1~2.3. Answer: B23. The "5-8" contact in the circuit breaker control loop is the () contact. (a) closing the case; (b) Open the brake; Locking; (d) conversion. Answer: A28. When the transformer power supply voltage is higher than the rated voltage, the loss in the iron core (). (a) reduction; (b) unchanged; Increase; (d) little change. Answer: C29. The turns ratio of primary winding and secondary winding of transformer is 25, and the secondary voltage is 400V, so the primary voltage is (). 10000 volts; (b) 35,000 volts; 15000 volts; 40,000 volts. Answer: A30. The highest working temperature of transformer is limited by thermal resistance (). (a) insulating materials; Metal materials; (c) iron core; Currently. Answer: A3 1. When the transformer temperature rises, measure the insulation resistance (). Increase; Reduce; (c) unchanged; (d) increase in proportion. Answer: B32. Oil-immersed air-cooled transformer, when the fan fails, the allowable load of the transformer is () of the rated capacity. 65%； 70%； 75%； 80%. Answer: B33. In 6 ~ 10 kV neutral ungrounded system, when grounding occurs, the phase voltage of non-fault phase will be (). (a) not rising; (b) simultaneous reduction; (c) An increase of 1.732 times; (d) doubled. Answer: C36. The AC withstand voltage test period of oil circuit breaker is once during overhaul, and the period below 10kV is (). Twice a year; Once every one to three years; Once every five years; Twice a year. Answer: B37. The nameplate of the transformer is marked with the rated voltage UE+5%, indicating that the transformer is (). (a) on-load voltage regulation; (b) three-stage voltage regulation; (c) no-load voltage regulation; (d) Three-stage on-load voltage regulation. Answer: B38. Current transformer in operation must make (). (a) Iron core and secondary winding are firmly grounded; (b) The iron core is grounded at two points; (c) The secondary winding is not grounded; (d) Multi-point grounding of iron core. Answer: A39. When the transformer is in normal operation, the normal upper oil temperature shall not exceed ()℃. 95 people; 85 years old; 75 people; (D) 105. Answer: B4 1. The fuse of DC control and signal circuit is generally selected as (). (1) 0 ~ 5a (b) 5 ~10a; (C) 10 ~ 20A； 20 to 30 amps. Answer: B42. The indoor temperature of the battery is between (). (1) 5 ~10℃; (B) 10 ~ 30℃； (c) Not higher than 50℃; (D)-10~0℃, answer: B43. Grounding of lightning protection device belongs to (). (a) working grounding; Protective grounding; (c) Lightning protection and grounding; Protective grounding. Answer: A44. When people stand or walk on the ground through which current passes, the voltage between their feet is called (). (a) step voltage; Contact voltage; (c) grounding voltage; (d) switching voltage. Answer: A45. In order to eliminate the uneven voltage distribution on each fracture of EHV circuit breaker and improve the arc extinguishing performance, () can be installed on each fracture of the circuit breaker. (a) shunt voltage-sharing capacitor; (b) equalizing resistance; (c) pressure balance belt; Equilibrium ring. Answer: A47. The hydraulic operating mechanism of circuit breaker should be mechanically locked in (). (a) When the pressure gauge indicates zero pressure; (b) The circuit breaker is heavily oiled; (c) When the pressure gauge indicates zero and the travel lever descends to the lowest microswitch; (d) When the hydraulic mechanism is frequently pressed. Answer: c also, send me the email address and send it to you.