DGT C licence questions: Mechanics and maintenance

Page 2 of 2 · Questions 101 to 156 of 156

101. An articulated vehicle is defined as…
102. What does the pressure gauge in the lubrication system indicate?
103. An insulated vehicle has a mechanical-compression or absorption refrigeration unit that lowers and maintains its body temperature. Which…
104. What does the word 'tubeless' mean on a tyre?
105. When the windscreen washer reservoir is low, how should you replenish it?
106. For efficient driving of a vehicle with a working synchromesh manual gearbox whose manufacturer does not require double-clutching, how…
107. When driving a vehicle with a manual gearbox and clutch pedal, what helps avoid unnecessary transmission wear?
108. When you turn on the ignition, the oil warning light comes on, and it goes off once the engine starts. What is this due to?
109. At the same engine speed with no other changes, if oil becomes hotter and its viscosity decreases, how can this affect lubrication pressure?
110. If your vehicle is fitted with a petrol engine and has a catalytic converter in the exhaust, what fuel should you use?
111. Stopping distance is divided into...
112. What does the aiming (adjustment) of a lorry's headlights consist of?
113. When leaving the driving position after parking a 6,000 kg MAM lorry with a manual gearbox on a noticeable 8% slope, besides stopping the…
114. In a truck, preventive maintenance of the braking system is important because:
115. When driving on a stretch of road that is flooded with water, what consequences can a shock absorber in poor condition have?
116. A driver without specialist training should leave replacement of certain lamps to a workshop because of high-voltage risk. Which lamps does…
117. In a serviceable flooded lead-acid battery, the level has fallen through normal water loss during use. Following manufacturer instructions,…
118. The engine oil dipstick is used to check...
119. What is the part of the tyre that rests on the ground called?
120. On a lorry with hydraulic power steering and a reservoir marked MIN and MAX, should you check its fluid level?
121. In a hydraulic braking system, the pedal feels spongy and temporarily improves after repeated applications. Which of these may be a cause…
122. When parking a vehicle with a trailer on a noticeable uphill gradient and leaving the driving position, a suitable kerb is available but no…
123. In an engine, besides lubricating the moving parts and the cylinder walls, what other purpose does the oil serve?
124. In a liquid-cooled engine whose coolant pump is belt-driven, which fault may reduce coolant circulation and cause overheating?
125. A heavy lorry has a working electric retarder. On a steep descent with adequate grip and use permitted by the manufacturer, how should it…
126. In a vehicle with a manual gearbox and a working conventional pedal clutch, when is the clutch engaged, coupling the engine to the gearbox…
127. Before driving a lorry through very cold areas, what should you check about its coolant?
128. A lorry has a body with insulated walls, doors, floor and roof to limit heat transfer, without a cold source or refrigeration equipment.…
129. Should I regularly check the windscreen washer fluid level?
130. Which gas is produced by complete combustion of the carbon in petrol or diesel fuel?
131. Under the conventional arrangement described in the DGT mechanics manual, where is the engine cooling-system thermostat generally located?
132. What main function do road-tyre tread grooves serve on a wet road?
133. A lorry circuit requires nominal 24 V and has two compatible 12 V batteries. Which connection adds their voltages?
134. An electrical accessory does not work while the others operate normally. The manual says to check its overcurrent protection first. Which…
135. In a diesel engine with a conventional mechanical injection pump and rack-controlled fuel delivery, which assembly includes the governor…
136. In a conventional four-cylinder, four-stroke engine, how far does the crankshaft rotate during one complete piston stroke from one dead…
137. If, due to traffic conditions, a lorry with an MAM (maximum authorised mass) of more than 3,500 kg becomes stationary inside an underpass,…
138. For an N2 or N3 lorry subject to Royal Decree 1417/2005, what speed must its compulsory limiter prevent it from exceeding?
139. Is an articulated vehicle a vehicle combination?
140. An insulated lorry uses a cold source other than mechanical compression or absorption equipment to lower and maintain its internal…
141. A lorry is driven at night, with good visibility and no conditions permitting fog-light use. May it travel with position lights alone?
142. In a lorry with a liquid-cooled combustion engine, the engine takes abnormally long to reach operating temperature. Which component…
143. What risk does brake overheating from excessive use, for example on a long descent, create?
144. When checking engine oil level with a dipstick, what conditions should you follow?
145. In a conventional liquid-cooling circuit with a thermostat and internal bypass, how does the thermostat help a cold engine warm up?
146. What does the word TUBELESS printed on the side of the tyre mean?
147. During normal driving while maintaining steering control, the vehicle persistently pulls to one side without an apparent road or wind…
148. By day, a lorry without front fog lamps and with no main beam in use travels on an interurban road in light snowfall that significantly…
149. Between sunset and sunrise, a lorry travels on a sufficiently lit through-road in a built-up area with no adverse weather. In addition to…
150. When leaving the driving position after parking a 6,000 kg MAM lorry with a manual gearbox on a noticeable 8% slope, besides stopping the…
151. What general term covers changes such as joining traffic, moving into another lane or turning, which alter the vehicle’s normal progress?
152. Before starting the day with a truck it is advisable to carry out:
153. If my lorry's steering is hydraulically assisted, should I check the steering fluid level?
154. What benefit is supported by keeping lorry tyres at the recommended cold pressure for their load?
155. If your lorry’s engine takes too long to reach normal operating temperature, which component should be checked?
156. Your lorry has a coolant expansion tank marked MIN and MAX. Under the manufacturer’s specified checking conditions, how should you check…