Question Paper for Air Brake

7/28/2019 Question Paper for Air Brake

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5th June 2006

ABS basics : Objective questions- Tick one correct option

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Question Option TicMa

1 With the vehicle having ABS, thedrivers will be able to drive fastereven on wet roads.

A Yes

B No

2 When the ABS warning lampsindicates a fault, the drivershould

A Immediately stop the vehicle and call theAuthorized service personnel to attend the faultsince this is related to the safety.

B Continue driving normally and get the faultrepaired at the end of the trip, since the basicbrake system continues to function to fullcapacity.

C Disconnect ABS.

D No action required. ABS continues to work inspite of a fault.

3 If driver has not applied the brakewith sufficient intensity duringpanic braking condition, then

A ABS will not do anything unless wheel lock isforeseen..

B ABS will increase the intensity of the brake toavoid an accident

4 Abs will intervene the normalbraking action whenever

A Driver applies a brake

B Ignition is switched on

C Wheels tend to lock

5 What is the main input to ABSECU

A Wheel speed sensor signals

B Modulator valve signal

C Air pressure

D All of the above

6 Which component can bechanged between Wabco and KB

ABS systems, and still thewarranty will remain valid

A ECUB Modulator valve

C Sensor

D All of the above

E None of the above

7 When ABS comes in to action A Exhaust brake is temporarily switched off.

B Retarder is temporarily switched off.

C Both of the above.

D Engine is temporarily switched off.

8 During sensor installation A Recommended grease to be applied on thebush.

B No grease should be applied on the bush.C Bush is not to be fitted.

9 Always mount the modulatorvalve with its exhaust port

A Facing upwards.

B Facing sideways.

C Facing downwards.

10 The first thing to be checkedbefore attempting to diagnosethe ABS is

A Whether the vehicle is a Bus, Truck or a tractor.

B Whether ABS make is Wabco or KB and voltageis 12 V or 24 V.

C Both of the above.

D None of the above.


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11 ABS cable should be routed andclamped with extreme carebecause

A Incase of their damage, entire harness or sensorassembly needs to be replaced.

B The vehicle can catch fire in case of short circuit.

C Fault in ABS will violate regulatory requirement.

D Fault in the ABS will result in complete loss ofbrake.

12 How a modulator valve is to beconnected?

A Inlet port to delivery of Dual brake valve and outlet port to brake chamber / spring brakeactuator.

B Inlet port to brake chamber / spring brakeactuator and out let port to delivery of Dualbrake valve.

13 What is the correct position forlocating ECU?

A It can be fitted on the long member.

B It has to be fitted in the cab.

C It can be fitted where it is well ventilated andprotected from water and high temperature.


14 When normally wheels lock? A When the vehicle is having perfect good braking,

B When braking torque applied to the wheel is toohigh and the road is slippery

C When the tyre is newD When brake is applied during high vehicle speed

15 How should the drivers preventwheel locking while drivingvehicle with ABS?

A By gear shifting

B By mildly applying the brake

C By repeated pumping of brake pedal


16What needs to be controlled toprevent wheel locking?

A Air system pressure

B Braking pressure in the chambers and thebarking torque at the wheels

C Speed of the vehicle by releasing accelerator

17 What are the main parts in ABS? A Pole wheel, Power cable, Modulator valve,warning lamp

B Pole wheel, ECU, Modulator Valve, Cableharness

C ECU, Modulator Valve, Pole wheel, Wheelspeed sensor

D Modulator valve, ECU, Warning lamp, Wheelspeed sensor

18 How does ABS sense wheellocking?

A By sensing wheel speeds and comparing withengine speed.

B By sensing wheel speeds and comparing withFoot brake valve pedal pressing

C By sensing the wheel speeds, comparing witheach other and comparing with vehiclereference speed

D By sensing the wheel speeds, comparing witheach other and comparing with engine speed.

19 What is the function of sensor? A To convert speed from analog to digital form


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B To sense the pole wheel teeth, convert to wheelrpm data and send to ECU

C To analyse wheel speed and detect locking

D To release brake and re-apply

20 How does ABS prevent wheellocking?

A By sensing the wheel speed, analyse and givingindication to the driver

B By sensing the wheel speed, analyse and

reducing the system pressureC By sensing the wheel speed, analyse and

repeatedly modulating brake pressure

21 What should be the maximumgap between pole wheel andsensor?

A 0.2mm

B 0.7mm

C 1.0mm

D 1.5mm

22 What do you do if there is excesssensor air gap?

A Pull and shake the sensor cable

B Push the sensor towards pole wheel softly

C Hit on the head of sensor with hammer

D Replace sensor

23 What do you do if there is cablecut error?

A Replace the harness

B Join the cut cable ends and use insulation tape

C Join the cut cable ends by soldering

D Leave the cable as it is, without repairing

24 After correcting the fault, if ABSwarning lamp is still on, then

A Drive the vehicle above 6 kmph speed andcheck whether lamp goes off.

B Drive the vehicle above 6 kmph speed andcheck whether wheels are locking during panicbraking.

C Erase the fault from the momory.

D Continue to operate thee vehicle inspite of afault.

25 How will you decide if there is aproblem with sensor

A Remove the sensor from wheel end and inspectfor damage

B Use multi-meter and check for resistance ofsensor

C Interchange sensor between left and right andcheck ,

D Interchange the sensor between diagonalwheels and check)

26 A Yes


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during gradual braking if anypulling is there whether ABS willhelp?

B No

27 If tractor has ABS, to get the fullbenefits of tractor ABS, whetherthe connected trailer also needsto have ABS?

A Yes

B No

Answers

1. B2. B3. A4. C5. A6. C7. C8. A9. C10.B

11.A12.A13.C14.B15.D16.B17.C18.C19.B20.B21.B

22.B23.A24.A25.B26.B27.B

Question Paper for Air Brake

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