Chapter 8 of 9

Mechanics

20 questions from the official bank with the right answer, in the order of the manual.

A test on this chapter Cards of this chapter

No. 3
What is the range of the lowest permissible pressure of compressed air in a pneumatic brake system?
1. AAbout 5-6 bar.
2. BAbout 9-10 bar.
3. CAbout 14-15 bar.
Right answer: A. An official question of the Ministry, in its official translation.
No. 5
The aim of the anti-freeze fluid pump in a braking system with compressed air is to:
1. AMaintain pressure of the system steady.
2. BFeed the system with compressed air, so that rates of higher and lower function pressure are maintained steady in the air containers.
3. CInject the compressed air with anti-freeze fluid, so that the various components do not freeze at very low temperatures.
Right answer: C. An official question of the Ministry, in its official translation.
No. 6
The exhaust brake is used:
1. AOn downhills.
2. BOn uphills.
3. CAt harsh braking.
Right answer: A. An official question of the Ministry, in its official translation.
No. 7
The aim of the connecting rod is:
1. ATo transfer the kinetic energy of the piston to the crankshaft.
2. BTo connect the piston with the camshaft.
3. CTo open and close the inlet and exhaust valve.
Right answer: A. An official question of the Ministry, in its official translation.
No. 9
In a suspension system with air, what is the use of the high pressure circuit:
1. AIt supplies additional air to, and increases the pressure in the air springs, when the car is being loaded, so as to maintain it steady.
2. BIt maintains a steady pressure in the air springs.
3. CIt supplies air to the servo-mechanisms of the vehicle.
Right answer: A. An official question of the Ministry, in its official translation.
No. 10
What is the aim of the central driving shaft, if the engine is at the front part and the driving wheels are at the rear part?
1. ATo transfer the motion to the front wheels.
2. BTo transfer the motion from the differential to the gear-box.
3. CTo transfer the torque from the gear-box to the driving wheels.
Right answer: C. An official question of the Ministry, in its official translation.
No. 13
The oil compression springs are designed:
1. ANot to allow the combustion gases to escape to the crankcase.
2. BNot to allow the lubrication oil to reach the combustion chamber.
3. CTo lubricate the piston-cylinder surfaces.
Right answer: A. An official question of the Ministry, in its official translation.
No. 15
The braking system with compressed air (air brakes) is used in lorries, because:
1. ADriving the vehicle becomes more comfortable.
2. BThe hydraulic braking system does not suffice for slowing down the vehicle.
3. CThe external wear of the piping system and of the other mechanisms of the air brakes is rare.
Right answer: B. An official question of the Ministry, in its official translation.
No. 17
The hydraulic steering system is used in lorries so as to:
1. AReduce the effect of driver’s muscular effort at turning.
2. BIncrease the effect of driver’s muscular effort at turning.
3. CIncrease the tyre grip on the road.
Right answer: B. An official question of the Ministry, in its official translation.
No. 20
If the braking effect is not the same on all wheels, there is a risk for the vehicle when moving on the road:
1. AOnly when the road has curves.
2. BOnly when the road is slippery.
3. CAlways, because during braking the vehicle may swerve from the road.
Right answer: C. An official question of the Ministry, in its official translation.
No. 22
The air compressor:
1. ASucks air, compresses and introduces it into the air containers.
2. BSucks air and sends it to the suspension system.
3. CSucks air and sends it to the cooling system.
Right answer: A. An official question of the Ministry, in its official translation.
No. 24
The centrifugal water pump of engine cooling system:
1. ASucks the cooling fluid from the upper water space of the radiator and sends it with natural flow to the cylinder casings of the engine.
2. BSucks the cooling fluid from the lower water space of the radiator and sends it with pressure to the cylinder casings of the engine.
3. CWith the help of the thermostat it sucks the cooling fluid and sends it to the cylinder casings.
Right answer: B. An official question of the Ministry, in its official translation.
No. 25
The automatic pressure regulator is a mechanism of the braking system which:
1. ARegulates automatically the pressure in the brake cylinders according to the loading of the vehicle.
2. BProduces the required compressed air.
3. CDistributes the air to more than one circuit.
Right answer: A. An official question of the Ministry, in its official translation.
No. 27
The aim of the crankshaft is:
1. ATo drive the piston.
2. BTo convert with the help of the cranks the reciprocating motion of the piston into rotary motion.
3. CTo transfer the kinetic energy of the piston to the transmission system.
Right answer: B. An official question of the Ministry, in its official translation.
No. 29
The servo-brake with compressed air applies to:
1. AA mechanical braking system.
2. BA hydro-pneumatic braking system.
3. CAn electrical braking system.
Right answer: B. An official question of the Ministry, in its official translation.
No. 34
What is the aim of the exhaust brake?
1. AThrift in fuel consumption.
2. BReduction of the use of footbrake during movement of the vehicle on a downhill.
3. CRelief of the engine.
Right answer: B. An official question of the Ministry, in its official translation.
No. 35
Which is the normal water circulation in the cooling system?
1. ARadiator - water jackets - water pump - thermostat -radiator.
2. BRadiator - thermostat - water jackets - water pump -radiator.
3. CRadiator - water pump - water jackets - thermostat -radiator.
Right answer: C. An official question of the Ministry, in its official translation.
No. 49
What is the function of the gear-box in the transmission system?
1. AAllows the progressive engagement with, and disengagement of the engine from the other parts of the system.
2. BAlters the ratio between engine revolutions and driving shaft revolutions and consequently of the wheels.
3. CIt transfers the power of the pair mitre-wheel-crown wheel to the wheels allowing them to have different rotanion speeds.
Right answer: B. An official question of the Ministry, in its official translation.
No. 51
What is the function of the primary shaft in the gear-box?
1. AThrough the clutch it is driven by the engine.
2. BThrough the central shaft and the joints, it drives the driving wheels.
3. CIt is driven by the central shaft and drives the secondary shaft.
Right answer: A. An official question of the Ministry, in its official translation.
No. 54
The rev-counter of lorries has yellow, green and red scales (areas of revolution indications). Where should the pointer be when the performance of the engine is good and the fuel consumption is limited?
1. AYellow scale.
2. BGreen scale.
3. CRed scale.
Right answer: B. An official question of the Ministry, in its official translation.

What is the range of the lowest permissible pressure of compressed air in a pneumatic brake system?

The aim of the anti-freeze fluid pump in a braking system with compressed air is to:

The exhaust brake is used:

The aim of the connecting rod is:

In a suspension system with air, what is the use of the high pressure circuit:

What is the aim of the central driving shaft, if the engine is at the front part and the driving wheels are at the rear part?

The oil compression springs are designed:

The braking system with compressed air (air brakes) is used in lorries, because:

The hydraulic steering system is used in lorries so as to:

If the braking effect is not the same on all wheels, there is a risk for the vehicle when moving on the road:

The air compressor:

The centrifugal water pump of engine cooling system:

The automatic pressure regulator is a mechanism of the braking system which:

The aim of the crankshaft is:

The servo-brake with compressed air applies to:

What is the aim of the exhaust brake?

Which is the normal water circulation in the cooling system?

What is the function of the gear-box in the transmission system?

What is the function of the primary shaft in the gear-box?

The rev-counter of lorries has yellow, green and red scales (areas of revolution indications). Where should the pointer be when the performance of the engine is good and the fuel consumption is limited?