Answer 9 free questions

ASE Truck Equipment: 9 free questions

Tap an answer to see if you're right and why, or switch to Timed and get scored at the end. Each answer is also under its question.

1. ASE TE1 Truck Equipment — Installation

   When drilling new mounting holes in a truck frame rail, the holes should be located in which part of the rail?

   AThe web (vertical center section) BThe top flange CThe bottom flange DEqually across both flanges
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   Answer: A. The web (vertical center section)

   The flanges carry the highest bending stress in a channel frame, so a hole there creates a stress riser that can crack. Body-builder guidelines require holes in the web, kept clear of the flange radius.

2. ASE TE2 Truck Equipment — Electrical Install

   On an ISO (Bosch-style) relay, terminal 30 is the:

   AOne side of the control coil, terminal 85 or 86 BThe normally closed output contact, numbered 87a CBattery-voltage feed to the relay's common contact DThe switched ground path for a dash indicator lamp
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   Answer: C. Battery-voltage feed to the relay's common contact

   In DIN 72552 numbering, terminal 30 is the common movable contact fed from battery power; 85/86 are the coil and 87/87a are the output contacts.

3. ASE TE3 Truck Equipment — Auxiliary Power

   A transmission-mounted PTO is rated at "58%." This rating indicates that the:

   APTO can transmit 58% of engine torque BPTO output shaft turns at 58% of engine crankshaft speed CPTO is 58% mechanically efficient DPTO engages at 58 psi air pressure
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   Answer: B. PTO output shaft turns at 58% of engine crankshaft speed

   PTO speed percentage expresses output-shaft rpm as a fraction of engine rpm, set by the transmission's PTO drive-gear ratio; a 58% PTO at 2000 engine rpm turns about 1160 rpm. It is not a torque, efficiency, or pressure figure.

4. ASE TE1 Truck Equipment — Installation

   Two technicians discuss drilling a truck frame. Technician A says new holes may be drilled in the web but must be kept a minimum distance from the flange radius. Technician B says holes in the top or bottom flange are acceptable if they are small. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: A. Technician A only

   Web holes are permitted with proper edge and flange spacing. Flange holes of any size sit in the peak-stress zone and are prohibited by body-builder guidelines.

5. ASE TE2 Truck Equipment — Electrical Install

   A 15-amp circuit keeps blowing its fuse. Technician A says to install a 20-amp fuse to stop the nuisance. Technician B says to find and repair the overload or short because a larger fuse can let the wire overheat. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: B. Technician B only

   Up-sizing the fuse defeats the wire's overcurrent protection and is a fire risk; the correct action is to diagnose the fault. Technician B is right.

6. ASE TE3 Truck Equipment — Auxiliary Power

   Technician A says a PTO's output speed depends on the transmission's PTO drive-gear ratio and engine rpm. Technician B says any clutch-shift PTO can be safely engaged at full engine speed without using the clutch. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: A. Technician A only

   A is right: output speed equals engine rpm times the PTO percentage. B is wrong: clutch-shift PTOs need the master clutch depressed to avoid gear clash; only hot-shift PTOs engage under power.

7. ASE TE1 Truck Equipment — Installation

   A dump body slowly settles (creeps down) on its own after being raised and held. The MOST likely cause is:

   AInternal leakage past the cylinder piston seal or the control-valve spool BA plugged return-line filter restricting flow back to the reservoir CAn oversized reservoir holding more oil than the cylinder can use DLoose body-mounting U-bolts that have lost clamp load on the rails
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   Answer: A. Internal leakage past the cylinder piston seal or the control-valve spool

   With the valve in the hold position, only internal leakage past a worn piston seal or a valve spool that will not seal lets trapped oil escape and the body settle.

8. ASE TE2 Truck Equipment — Electrical Install

   A newly installed accessory blows its fuse the instant power is applied, even with the accessory switched off. The MOST likely cause is:

   AAn open circuit in the load BA direct short to ground in the feed wire ahead of the switch CA weak battery DAn undersized ground
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   Answer: B. A direct short to ground in the feed wire ahead of the switch

   Immediate fuse failure with the load off points to a dead short to ground on the supply side, giving near-zero resistance and very high current.

9. ASE TE3 Truck Equipment — Auxiliary Power

   Immediately after a new transmission-mounted PTO is installed, it produces a high-pitched whine that rises with engine speed. This is MOST likely caused by:

   AExcessive gear backlash between the PTO and transmission gear BInsufficient gear backlash (too few mounting gaskets) CA worn PTO output-shaft bearing DLow transmission fluid level
   Show answer

   Answer: B. Insufficient gear backlash (too few mounting gaskets)

   A whine or squeal indicates the PTO gear is meshed too tightly with too little backlash, usually from too few mounting gaskets; adding gaskets increases backlash. Excessive backlash instead produces a rattle or knock.