DGT D licence questions: Mechanics and maintenance

Page 2 of 2 · Questions 101 to 126 of 126

101. In a pneumatic braking system, what is the function of the relief valve that limits the maximum pressure of stored air?
102. What does the ABS braking system achieve?
103. What happens when a tyre has a low pressure level?
104. What is the general maximum permitted mass of a three-axle articulated bus, excluding special propulsion-technology increments and other…
105. Your heavy vehicle has an auxiliary electric retarder in addition to its service and parking brakes. What should you use it for, following…
106. On a bus with hydraulic power steering and a reservoir with minimum and maximum marks, should you check the fluid level following the…
107. In a modern fuel-injected car, which practice avoids unnecessary fuel use when starting the engine?
108. The oil that lubricates the turbocharger mechanism is...
109. As a general rule, to provide traction when using snow chains on a bus, which wheels must they be fitted to?
110. There is a flywheel at one end of the crankshaft. What is it used for?
111. If we keep the tyres at the correct pressure, we will ensure that…
112. If, when carrying out the periodic technical inspection of the bus, the result is unfavourable, the vehicle…
113. If you keep your tyres at the correct pressure, what will you achieve?
114. If a warning appears in a D1 or D bus indicating a major fault, the correct action is to:
115. With the engine running, the warning light for minimum oil pressure in the lubrication circuit stays on. What does it indicate?
116. During a routine check, when should you measure bus tyre pressure to compare it with the recommended cold inflation pressure?
117. If you notice unusual noises or vibrations in a D1 or D bus, the prudent action is to:
118. What is the maximum authorised mass per single driven axle of class II (interurban buses)?
119. What are the ABS, ASR and ESP systems?
120. In a diesel system with separate supply and injection pumps, which component takes fuel from the tank into the low-pressure supply circuit?
121. In a four-stroke engine with wet-sump lubrication, where is the oil-collecting sump?
122. In a conventional compression-ignition diesel engine, what is the condition of the air when fuel is injected to produce combustion?
123. In a direct-injection internal combustion engine, where does the mixture form?
124. What is the purpose of the bleeder in a hydraulic braking circuit?
125. Where is the air filter located in a supercharged combustion engine?
126. In a conventional drivetrain with a propeller shaft and crown wheel and pinion final drive, which mechanism provides a fixed reduction…