2. 1.which of the follwing brakes is commonly used in motor
cars?
फोलव िंग ब्रेक में से कौन सा आमतौर पर मोटर में उपयोग ककया जाता
है कारों?
(a) Band brake (b) Shoe brake
(c) Band and blocke (d)Internal expanding shoe
brake
3. Q.2 brakes commonly used in trains are ----- brakes?
• (a) Band (b) Shoe
• (c) Band and block (d) Internal expanding shoe
4. Q.3 In a self- locking brake ,the force required to apply
the brake is ?
(a) minimum (b) Shoe
(c) maximum
5. Q. 4 When the friction forcehelp the applied force in
applying the brake, the brake is
(a) self-locking (b) Automatic
(c) self-energing
6. Q.5 In an interal expanding shoe brake, more than 50% of
the total braking torque is supplied by
(a) leading shoe (b)trailing shoe
(c) any of the two
7. Q. 6 The ratio of tensions on the tight and slack sides in a
band and block brake is give by?
(a) T
8. Q7. Tractive resistance during the propulsion of a
wheeled vehicle depends on
(a) road resistance (b) aerodynamic resistance
(c) gradient resistance (d) all the above
9. Q.8 Which lubricant is used in a rope brake dynamometer?
(a) Oil (b) Water
(c) Grease (d) no lubricant
10. • . Which of the following is a characteristic feature of a
dynamometer?
• a) It can measure torque
• b) It can measure frictional resistance
• c) It can measure the balancing force
• d) It can act as a speedometer
11. • Prony brake dynamometer is an absorption
dynamometer.
• a) True
• b) False
12. • In which of the following dynamometers does the entire
energy or power produced by the engine is absorbed by
the friction resistances of the brake?
• a) Prony brake dynamometer
• b) Torsional dynamometer
• c) Epicyclic train dynamometer
• d) Belt transmission dynamometer
13. • In which of the following dynamometers does the energy
produced by the engine is used for doing work?
• a) Prony brake dynamometer
• b) Rope brake dynamometer
• c) Absorption dynamometer
• d) Epicyclic train dynamometer
14. • Flywheel diameter 1.2 m; diameter of the rope 12.5 mm;
engine speed 200 r.p.m.; dead load on the brake 600 N;
spring balance reading 150 N. Using this data, calculate
the brake power of the engine in kW.
• a) 5.715
• b) 5.525
• c) 6.125
• d)5.625
15. • Flywheel diameter 1.2 m; diameter of the rope 12.5 mm;
engine speed 400 r.p.m.; dead load on the brake 600 N;
spring balance reading 150 N. Using this data, calculate
the brake power of the engine in kW.
• a) 12.82
• b) 11.43
• c) 13.64
• d) 10.22
16. • For a rope brake dynamometer, the flywheel is cooled
with soapy water because________
• a) Energy is absorbed by the dynamometer
• b) Energy is used to do work
• c) Energy is provided by the motor
• d) Energy supplied is more
17. • Belt transmission dynamometer is an absorption
dynamometer.
• a) True
• b) False
18. • For which of the following dynamometers the driving
torque on the shaft is not uniform and it is subjected to
severe oscillations?
• a) Pony brake
• b) Band brake
• c) Belt transmission
• d) Epicyclic train
19. • In which of the following dynamometers does the energy
produced by the engine is used for doing work?
• a) Prony brake dynamometer
• b) Rope brake dynamometer
• c) Absorption dynamometer
• d) Epicyclic train dynamometer
20. • Which of the following type of brakes can bring the
member to an absolute rest?
• a) Hydraulic
• b) Electric
• c) Mechanical
• d) Fluid agitator
21. • Answer: c
• Explanation: The electric and hydraulic brakes cannot
bring the member to rest and are mostly used where large
amounts of energy are to be transformed.
22. • Electric brakes are used to control the speed of vehicle
during downhill travel.
• a) True
• b) False
23. • In which of the following brakes the force acting on the
brake drum is in axial direction?
• a) Block brake
• b) Shoe brake
• c) Band brake
• d) Cone brake
24. • If the angle of contact is greater than 60 degrees, then
unit pressure normal to the surface of contact is
__________
• a) Less at the ends than at the centre
• b) More at the ends then centre
• c) Remains equal at the ends and the centre
• d) Remains unaffected
25. • For a double block shoe brake, the braking action is
halved.
• a) True
• b) False
