Elements 5

The brake capacity to absorb energy is known as
A. energy
B. power
C. resistance brake
D. braking torque

How do you call the braking system when frictional force helps to apply the brake ?
A. self-locking
B. back-stop
C. partially self energizing
D. fast acting

Which of the following are also changed while replacing brake lining?
A: Block brake
B. Brake shoes
C. Shoe rivets
D. Shoe spring

Which of the following is basically the important parameter for brakes and clutches ?
A. Frictional torque
B. Modulus of Rigidity
C. Flexural stress
D. Metal absorbing the energy

Rope brake dynamometer uses what?
A. oil as lubricant
B. no lubricant
C. grease as lubricant
D. water as lubricant

When more than one spring or resisting member shares the loadthe relative stiffness is the
A. normal transverse stress
B. stiffness
C. rigidity
D. modulus of elasticity

The wire of helical torsion spring is subjected to what stress?
A. Torsional shear stress
B. Bending stress
C. Compressive shear stress
D. Tensile stress

A kind of braking systems such that if the band wraps partly around the brake drum and the braking action is obtained by pulling the band tight into the wheel.
A. block brake
B. clutch
C. band brake
D. centrifugal brake

How do you call the phenomenon in which the effectiveness of the brake may greatly decrease shortly after it begins to act continuously?
A. Fade
В. Creep
C. Dynamic transformation
D. Frictional dissipation

Which of the following is the brake that is mostly used in motorcycles ?
A. band brake
B. disc brake
C. internal expanding brake
D. air brake

Which of the following is the most popular type of spring?
А. Helical spring
B. Leaf spring
C. Torsion spring
D. Garter Spring

For practical applications of helical springsthe spring index usually varies from
A. 6 to o
B. 3 to 6
C. 4 to 12
D. 5 to 10

The term backstop refers to a brake that is —-
A. Self-locking in one direction
B. Self-energizing
C. Self-locking in both directions
D. Self-heat-dissipating

The energy absorbed by the brake is converted into
A. Heat
B. Potential energy
C. Kinetic energy
D. Rotational energy

A dynamometer is a form of brake that is used
A. to measure output torque
B. to measure angular velocity and displacement
C. on motor vehicle
D. on power transmission main shafts

For helical springs low spring index means sharpness of curvature.
A. low
B. high
C. weak
D. fading

The ratio of block width to drum diameter for block brakes must be kept between
A. 0.25 to 0.50
B. 0.50 to 1.0
B. 0.15 to 0.45
D. 0.50 to 0.60

Which of the following is a classication of brake or braking system?
A. Mechanical
B. Hydraulic and Pneumatic
C. Electrical
D. All of these

Which of the following is the brake that is mostly used in automobiles ?
A. band brake
B. disc brake
C. internal expanding brake
D. air brake

The best materials for brake drums is
A. aluminum
B. steel material
C. cast iron
D. wrought iron

What is the recommended coefficient of fluctuation of flywheels for punching, shearing, pressing, machine?
A. 0.005-0.1
B. 0.07-0.01
C. 0.3-0.05
D. 0.01-0.03

In hoists and elevators the brake absorbs the ——released by the moving weight during the braking system
A. potential energy
B. kinetic energy
C. translational energy
D. heat energy

A heavy rotating body which serves as a reservoir for absorbing and redistributing kinetic energy.
A. flywheel
B. governor
C. shaft
D. puncher

Cast iron flywheels are commonly designed with factor of safety of —-
A. 9 to 12
B. 8 to 11
C. 10 to 13
D. 7 to 10

An elastic body whose primary function is to deflect under load.
A. spring
B. brake
C. stopper
D. clutch

It is defined as the axial length of the helical spring subjected to maximum compressive force.
A. Free length
B. Solid length
C. Compressed length
D. Nominal length

For helical spring this actually represents the slope of load-deflection line.
A. Stiffness of the spring
B. Gradient of the spring
C. Spring constant
D. All of these

It equalizes the energy exerted and the work done thus preventing excessive or sudden changes of speed
A. flywheel
B. balance wheel
C. flywheel pulley
D. all of these

From experience specify the conventional limit of flywheel operations to be at 6000 ft/min for cast iron and ——
for cast steel.
A. 7000
B. 8000
C. 10000
D. 12000

Which of the following is preferable for helical spring with less than 0.020 inch wire size diameter or with spring index greater than 12 ?
A. Open end not ground
B. Open end and ground
C. Closed end not ground
D. Closed end and ground

It is the ratio of the mean diameter of coil over the coil diameters.
A. Wahl factor
B. Spring Index
C. Coil ratio
D. Lead scale

Which of the following is preferable for helical spring with greater than 0.020 inch wire size diameter or with spring index less than 12?
A. Open end not ground
B. Open end and ground
C. Closed end not ground
D. Closed end and ground

What is the overall length of the spring when it is compressed until all adjacent coils touched?
A. free length
B. solid length
C. compressed length
D. expansion length

A special form of helical extension spring with ends fastened together to form garter like rings.
A. Torsion spring
B. Belleville spring
C. Volute spring
D. Garter spring

Which of the following is NOT a function of spring?
A. absorbs energy
B. source of potential energy
C. measure weight
D. measure thickness

Which of the following is the type of spring made in the form of dished washer?
A. Air spring
B. Bellevile spring
C. Volute spring
D. Motor spring

It is a type of coil where the helical coil is wrapped into a circle forming an annular ring.
A. Volute spring
B. Hair spring
C. Motor spring
D. Garter spring

It is a type of spring where thin flat strip wound up on itself as a plane spiral usually anchored at the inside end.
A. motor spring
B. garter spring
C. volute spring
D. helical spring

The total frictional energy that is stored in the brake parts principally in the drum or disk is approximately:
A. 56% up
B. 90% up
C. 86 % up
D. 75% up

A heavy rotating body which serves as reservoir for absorbing and redistributing kinetic energy.
A. shaft
B. governor
C. flywheel
D. puncher®

The typical steel used for hot-wound coil springs and flat springs includes
A. AISI 1095
B. AISI 1020
C: AISI 304
D. AISI 1010

It is the friction of wheel inclination from the vertical position.
A. Camber
B. toe-in
C. caster
D. king pin inclination

In general steel springs are made of relatively
A. high carbon steel
B. low carbon steel
C. medium carbon steel
D. all of these

In generalthe steel springs are made of relatively high carbon steel usually
A.5%
B. less than 0.5 %
C. more than 0.5%
D. 7.5 %

Which of the following spring materials is also known as ASTM A228 ?
A. Hard drawn spring wire
B. Music wire
C. Oil spring - tempered wire
D. Valve spring quality carbon steel

Which of the following alloying elements used in springs to make more reliant.
A. Silicon
B. Tungsten
C. hardness and resistance
D. Nickel

Steel spring material is usually hardened from 400 to 500 BHN and the carbon content is in the range of how many percent?
A. 0.50 to 0.90 %
B. 0.45 to 0.48
C. 0.96 to 0.97
D. all of these

It is the length of a coil spring under no load.
А. compressed length
B. free length
C. solid height
D. none of these

It is a low cost spring material suitable where service is not severe and dimensional precision is not needed.
A. helical spring wire
B. stainless steel
C. hard drawn wire spring
D. copper

What is the hard drawn (80% reduction) spring wire made of high carbon steel?
A. oil tempered wire
B. music wire
C. tension wire
D. chromium wire

Which of the following wires with good quality and is used for impact loading.
A. hard drawn wire
B. song wire
C. helical spring wire
D. chromium - silicon wire

The percentage difference in solid and working deflections is known as
A. Clash allowance
B. Spring rate
C. Spring allowance
D. Spring Index

Which of the following is one of the best methods for increasing a spring's fatigue life?
A. Stress relieving
B. Tempering
C. Shot peening
D. Hardening

Which of the following springs are widely used for the suspension of carstrucks and railway wagons?
A. Multileaf Springs
B. Helical Springs
C. Belleville Springs
D. Torsion Springs

How do you call the longest leaf in a multileaf springs?
A. Full length leaf
B. Extra full length leaf
C. Master leaf
D. Graduated leaf

The group of graduated length leaves along the master leaf for a multileaf springs can be treated as —-
A. extra leaf
B. one whole full leaf
C. eccentric plate
D. triangular plate

In multileaf springthe bending stresses in extra full-length leaves are ——
more than those in
graduated-length leaves.
А. 50%
В. 20%
C. 33%
D. 10 %

For block brake with short shoethe angle of contact between the block and brake drum is usually small and less than —-
A. 20°
B. 30°
C. 45°
D. 10°

A spring that consists of a coned disk and resembles to a dinner plate without bottom.
A. Belleville spring
B. Disk spring
C. Volute spring
D. Garter Spring

Which of the following is otherwise known as cushioning devices that provide internal damping and make them suitable for shock mounts?
A. Rubber springs
B. Belleville springs
C. Multileaf spring
D. Garter Spring

Which of the following is the type of stress induced in spring wire when helical compression spring is subjected to axial tensile force?
A. Transversal stress
B. Tensile stress
C. Shear stress
D. Bending stress

Which of the following is the type of brake that is commonly employed in a railway train?
A. Block brake with short shoe
B. Internal expanding brake
C. Simple Band brake
D. None of these

Which of the following is the type of brake that is usually installed on the front wheel of most of the motorcycles?
A. Disk brake
B. Internal expanding brake
C. Block brake
D. Drum brake

The maximum shear stress in spring wire is induced at——of the coil.
A. outer surface
B. inner surface
C. middle surface
D. circumferential

What stress is experienced by the leaves of a loaded multileaf spring?
A. torsional stress
B. compressive stress
C. bending stress
D. tensile stress

Which of the following types of spring used to achieve bigger load carrying capacity for a given limited space?
A. single wire helical spring
B. helical springs in series
C. concentric springs
D. volute spring

What is the most common cross section of the flywheel arm (spoke) ?
A. rectangular
B: I section
C. Elliptical
D. triangular

What is the coefficient of fluctuation of speed of a flywheel?
A. It is the ratio of maximum fluctuation of speed ang the mean speed.
B. It is the difference of maximum fluctuation of speed and the mean speed
C. It is the product of maximum fluctuation of speed and the mean speed
D. It is the geometric mean between maximum fluctuation of speed and the minimum fluctuation speed.

Which of the following stresses is/are induced on the rim of a flywheel ?
A. shear stress and bending stress
B. compressive stress and bending stress
C. torsional stress and bending stress
D. direct tensile stress and bending

How do you call the ratio of maximum fluctuation of energy to the work done per cycle?
A. Coefficient of fluctuation of energy
B. Coefficient of fluctuation of speed
C. Mean fluctuation energy coefficient
D. All of these

In flywheel design the maximum fluctuation of energy
is the
A. Difference between maximum and minimum kinetic energies in the cycle.
B. Ratio of maximum and minimum kinetic energies in the cycle.
C. Sum of the mean and minimum kinetic energies in the cycle.
D. Product of maximum and minimum kinetic energies in the cycle.

Which of the following is the most valid reason as to why the concentration of mass in flywheels is on its rim?
A. In order to store maximum energy.
B. So the rotation is maximized.
C To make the flywheel strong and rotational speed will increase.
D. It makes the rotation continues.

Which of the following machines that flywheel is not needed?
A. Reviting machines
B. Rowing machine
C. Punching machine
D. Lathe machine

Which of the following is represented by ½ 1 $\omega$ where I is the moment of inertia and w is the angular speed?
A. Kinetic energy of the flywheel
B. Angular momentum of the flywheel rim
C. Centrifugal force of the flywheel
D. Fluctuation energy of the rim

How do you call the ratio of maximum fluctuation speed to the mean speed?
A. Coefficient of fluctuation of energy
B. Coefficient of fluctuation of speed
C. Coefficient of restitution of speed
D. Difference of fluctuation energy

Which of the following statements is CORRECT about springs ?
A. Springs are used mainly to store strain energy
B. Springs are used to absorb shocks and vibration
C. Springs are also used to act as reservoir of energy
D. All of these

The safe rim velocity of a flywheel is influenced by which of the following?
A. Energy fluctuation
B. Speed fluctuation
C. Flywheel's mass
D. Centrifugal stress

Which of the following material properties is/are need for a spring?
A. high breaking strength
B. high yield strength
C. more hardness
D. all of these

Which of the following is used for spring with moderate stress and low impact or shock?
A. ASTM A228
B. ASTM A229
C. ASTM A227
D. ASTM A230

What is the overall stiffess of the two helical springs connected in parallel if each spring has individual stiffness of k?
A. 2k
В. ¼к
С. ½ k
D. k

Which type of spring is used when the space is relatively small and large amount of energy stored is needed ?
A. Leaf spring
B. Spiral torsion spring
C. Bellevile spring
D. Helical spring

Which of the following is the Whal's stress factor used in helical spring? Note: C is the spring index.
A. (4C - 1) / (4C -4) + 0.615/C
B. 1 + 0.615/C
C. (4C + 2) / (4C- 3)
D. (4C-2) / (4C+ 2) + 0.615/C

Which of the following is used for general-purpose spring with poor fatigue life? It is also known as ASTM A227.
A. Music wire
B. Hard drawn
C. Oil tempered
D. Spring brass

Which of the following is the Bergstrasser factor used in helical spring ? Note: C is the spring index.
A. (4C - 1) / (4C - 4) + 0.615/C
B. (4C + 2) / (4C- 3)
C. (4C-2) / (4C + 2) + 0.615/C
D. 1 + 0.615/C

Which of the following is an example of mechanical brake?
A. Block brake
B. Internal expanding brake
C. Disk brake
D. All of these

What is the overall stifiness of the two helical springs connected in series if each spring has individual stiffness of k?
A. 2k
B. ¼k
C. ½ k
D. k

Which of the following is the direct shear stress correction factor? Note: C is the spring index
A.. (4C- 1) / (4C - 4) + 0.615/C
B. (4C + 2) / (4C- 3)
C. (4 C- 2)/(4C + 2 ) + 0.615/C
D. 1 + 0.615/C

Which of the following is the usual ratio of shoe width to wheel diameter in block brakes?
A. 0.25 to 0.50
B. 0.12 to 0.35
C. 0.50 to 0.75
D. 0.65 to 0.85

Which of the following material used for spring with high strength and excellent fatigue life ?
A. Hard drawn spring wire
B. Music wire
C. Oil tempered wire
D. Valve spring quality carbon steel

When the temperature of rubbing surfaces (brake linings) increaseswhat will happen to the coefficient of friction?
A. Increases
B. Decreases
C. Remains the same
D. Intermittently increases

Which of the following spring materials is used for elevated temperature applications with maximum service temperature of 950 °F?
A. A226
В. А230
C. А286
D. A232

For highly stressed applicationstorsion bar springs are made of
A. Silicomanganese
B. Oil tempered
C. Volute spring
D. Chrome vanadium

Which of the following spring materials has constant modulus over wide temperature range ?
A. Spring brass (ASTM B134)
B. Valve Spring (ASTM A230)
C. Music wire (ASTM A228)
D. Ni-Span C

For flat springs where fatigue resistance or high resistance setting is important and for heavy duty. application use
A. AISI 1095
B. AISI 1075
C. AISI 1050
D. AISI 1065

Which of the following springs is used for locks in automobiles and to maintain pressure on carbon brushes of electric motors and generators?
A. Spiral torsion spring
B. Garter spring
C. Volute spring
D. Compression helical spring

For flat springs where fatigue resistance or high resistance setting is important and for general purpose application use
A. AISI 1095
B. AISI 1075
C. AISI 1050
D. AISI 1065

A mechanical device that absorbs the energy possessed by a moving system or mechanism by means of friction. Its primary purpose is to slow down or completely stop the motion.
Ạ. Spring
B. Brake
C. Flywheel
D. Clutch

Which of the following statements is CORRECT ?
A. Shoe brake is used in railway train.
B. Internal expanding brake is used in cars and trucks.
C: Prony brake dynamometer is an absorption type dynamometer.
D. All of these

Which of the following is the brake commonly used in aircraft ?
A. Shoe brake
B. Internal expanding brake
C. Regenerative brake
D. Hydraulic brake