ASE A2 Automatic Transmission Practice Test
11. A transmission brake band:
- A. Holds and drives members of the planetary gear set.
- B. Is a stopping and holding device.
- C. Both A and B.
- D. Neither A or B.
Answer A is wrong. Automatic transmission clutches hold and drive members of the planetary gear set.
Answer B is correct. A transmission band is considered a reaction device, in the same family as multiple clutch discs and one-way overrunning clutches. There is a difference. A brake band is strictly a stopping and holding device.
Answer C is wrong. Automatic Transmission Brake Bands are flexible steel plates lined with organic (cellulose) or semi-metallic friction material.
Answer D is wrong. The lining absorbs transmission fluid to aid in heat dissipation. As the band tightens around the drum, the fluid is squeezed out into grooves cut into the band's surface. The band brings the drum to a stop and holds it there.
12. Shift valves are controlled by:
- A. Governor pressure.
- B. Throttle pressure.
- C. Both A and B.
- D. Neither A or B.
Answer A is wrong. Governor pressure works on one end of the valve, and a spring assisted by throttle pressure works on the other.
Answer B is wrong. Throttle pressure indicates engine load. Older transmissions use a vacuum modulator, late-model vehicles use computer-controlled electric solenoids to achieve precise timing.
Answer C is correct. These two pressures control shift valve movement.
Answer D is wrong. Shift valves control hydraulic pressure flow to the reactionary devices (clutches and bands) that drive and hold members of the planetary gearset.
13. Which transmission pump changes its flow rate to meet the needs of an automatic transmission?
- A. A diaphragm positive displacement pump.
- B. A fixed-displacement crescent gear pump.
- C. A variable-displacement vane pump.
- D. A fixed-displacement rotor pump.
Answer A is wrong. A diaphragm positive displacement pump is not a variable-displacement automatic transmission pump.
Answer B is wrong. The most common type of gear pump is the crescent pump. These pumps have two gears like other gear pumps, but they are designed with an outer gear with internal teeth and a smaller inner gear with external teeth. As these teeth mesh, they carry with them and force fluid from the inlet port to the outlet port.
Answer C is correct. A variable-displacement/rate transmission pump changes its flow rate according to the needs of the transmission. This pump saves on wasted energy and power.
Answer D is wrong. A rotor-type pump is similar to a crescent gear pump, except it utilizes rotors instead of gears.
14. An automatic transmission has delayed engagement when shifting from Park into Drive or Reverse. Which of the following is LEAST likely to result in this condition?
- A. A clogged transmission oil filter.
- B. Low oil pressure.
- C. Oil pump starvation.
- D. Open shift interlock solenoid.
Answer A is wrong. A clogged automatic transmission oil filter affects fluid flow and pressure. It causes a noticeable delay while shifting from Park into other gears.
Answer B is wrong. If the transmission has a drawn-out and delayed shift from Park to Reverse while backing up, suspect low or restricted oil pressure. Low pressure causes erratic shifting into other gears as well.
Answer C is wrong. A clogged oil filter results in oil pump starvation; the blockage obstructs the oil pumps fluid supply. It can result in clutch and band slippage.
Answer D is correct. If the transmission does not shift out of Park, suspect a faulty shift interlock solenoid.
15. Technician A says a faulty transmission range sensor will prevent starter operation. Technician B says to test an analog transmission range sensor with an ohmmeter. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. Both the neutral safety switch and the transmission range sensor can prevent starter operation.
Answer B is wrong. An analog transmission range sensor is constructed of a series of resisters that reduce the voltage signal returned to the PCM according to the shift lever position. It can be tested for proper resistance with an ohmmeter.
Answer C is correct. Both Technicians are correct. The Neutral Safety Switch and the TR sensor are protection devices used to prevent starter operation in all gears other than Park and Neutral.
Answer D is wrong. The Transmission Range Sensor is part of the transmission computer control system found on late-model vehicles. It can be analog or digital.