Question 2:

A band brake has a 76 cm diameter drum sustains a load of 1200 kg to a

hoisting drum 50 cm in diameter. What is the band tension difference?

Question 3:

A steel band have a maximum tensile stress of 50 Mpa and thickness of

10 mm. If the tension in tight side is 8 KN, what width of band should be

used?

Question 4:

The effective radius of the pads in a single collar thrust block is 230 mm

and the total load on the thrust block is 240 KN when the shaft is running

at 93 rpm. Taking the coefficient of friction between thrust collar and

pads as 0.025, determine the power loss due to friction.

Question 5:

The ratio of band tension in a band brake is 3.5. If angle of contact is 265

degrees, determine the coefficient of friction.

Question 6:

A band brake has an angle of contact of 280 degrees and is to sustain a

torque of 12,000 in-lbs. The band bears against a cast iron drum of 18 in

diameter. The coefficient of friction is 0.35. Find the tension at the tight

side.

Question 7:

A simple band brake has a 70 cm drum with coefficient of friction of 0.25

and arc of contact of 250. The drum sustains a load of 1220 kg and

rotates at 260 rpm. Find the power absorbed by the band.

Question 8:

What band thickness in mm is necessary for a 500 mm diameter drum if

the maximum lining pressure is 0.05 Mpa, and the allowable band's stress

s 4 Mpa?

Question 9:

A bearing whose shaft rotates at 600 rpm, has a friction loss of 15 KW.

The bearing load is 25 KN and friction of 0.14. Find the bearing diameter.

Question 10:

A bearing journal rotates at 460 rpm is used to support a load of 40 KN. It

has a diameter of 18 cm and length of 30 cm. Find the friction loss in kw

per bearing. Use f = 0.12.

Question 11:

A 50 mm diameter shaft supported by two bearings carries a load of 13.3

MN. The shaft rotates at 150 rpm. If the coefficient of sliding friction

between the shaft and bearing is 0.10, how much power is lost due to

friction in each bearing?

Question 12:

A bearing has a per unit load of 650 Kpa. The load on bearing is 20 KN

and it has a diametral ratio of 0.0012. If diametral clearance is 0.120 mm,

find the length of journal.

Question 13:

A 1 in horizontal shaft rotates at 500 rpm in a sleeve-type bearing. The

coefficient of friction is 0.15. Calculate the horsepower lost in the bearing

if the reaction between the shaft and the bearing is 800 lb.

Question 14:

A bearing whose shaft rotates at 500 rpm, has a friction loss of 20 KW.

The bearing load is 30 KN and friction of 0.14. Find the bearing diameter.

Question 15:

A pulley has a belt pull of 2.5 KN. If 30 Hp motor is used to drive the

pulley, determine the belt speed.

Question 16:

A belt connects a 10 cm diameter and 30 cm diameter pulleys at a center

distance of 50 cm. Determine the angle of contact at the smaller pulley.

Question 17:

A pulley 610 mm in diameter transmits 40 kw at 500 rpm. The arc of

contact between the belt and pulley is 144 degrees, the coefficient of

friction between belt and pulley is 0.35 and the safe working stress of the

belt is 2.1 Mpa. Find the tangential force at the rim of the pulley in

Newton.

Question 18:

A compressor is driven by a 25 KW motor by means of V-belt. The service

factor is 1.4 and the corrected horsepower capacity of V-belt is 5.

Determine the number of belts needed.

Question 19:

A pulley 600 mm in diameter transmits 40 KW at 500 rpm by means of

belt. Determine the effective belt pull.

Question 20:

An open belt connected pulleys has 15 cm diameter and 45 cm diameter.

If center distance is 60 cm, determine the angle of contact of smaller

pulley.

Question 21:

Two shafts 3.6 m between centers carry pulleys 1.2 min diameter and

0.91 min diameter respectively, connected by a crossed belt. It is desired

to put the belt on as an open belt. How long a piece must be cut of it?

Question 22:

Determine the belt length of an open belt to connect the 6 cm and 12 cm

diameter pulley at a center distance of 60 cm.

Question 23:

The torque transmitted in a belt connected 300 mm diameter pulley is

400 N-m. Find the power driving the pulley if the belt speed is 20 m/s.

Question 24:

A pulley 610 mm in diameter transmits 40 kw at 500 rpm. The arc of

contact between the belt and pulley is 144 degrees, the coefficient of

friction between belt and pulley is 0.35 and the safe working stress of the

belt is 2.1 Mpa. Find the shaft torque.

Question 25:

An 8 in diameter pulley turning at 600 rpm is belt connected to a 14 in

diameter pulley. If there is a 6 % slip, find the speed of 14 in pulley.

Question 26:

A 3/8-inch flat belt is 10 inches wide and is used on 24 inches diameter

pulley rotating at 600 rpm. The specific weight of belt is 0.035 lb/in³ .

The angle of contact is 150 degrees. If coefficient of friction is 0.3 and stress is

300 psi, how much power can it deliver?

Question 27:

The tension ratio for a belt in a pulley with a 200° angle and frictional

coefficient of 0.3 is:

Question 28:

An ammonia compressor is driven by a 20-kw motor. The compressor

and motor rpm are 360 and 1750 rpm, respectively. The small sheave has

a pitch diameter of 152.4 mm. If the belt to be used is standard C-120,

determine the center distance for belt length of 171.20 in.

Question 29:

Determine the width of a 6-ply rubber belt required for a ventilating fan

running at 150 rpm driven from a 12 inch pulley on a 70 hp at 800 rpm.

The center distance between pulley is 2 ft and the rated belt tension is

78.0 lb/in width.

Question 30:

A 25.4 cm pulley is belt-driven with a net torque of 339 N-m. The ratio of

tension in the tight side of the belt is 4:1. What is the maximum tension

in the belt?

Question 31:

A pulley have an effective belt pull of 5 KN and an angle of belt contact

of 170 degrees. The working stress of belt is 2 Mpa. Determine the

thickness of belt to be used if width is 250 mm and coefficient of friction

is 0.32.

Question 32:

A pulley 610 mm in diameter transmits 40 kw at 500 rpm. The arc of

contact between the belt and pulley is 144 degrees, the coefficient of

friction between belt and pulley is 0.35 and the safe working stress of the

belt is 2.1 Mpa. Find the force at the tight side.

Question 33:

A cone clutch has an angle of 14° and coefficient of friction of 0.42. Find

the axial force required if the capacity of the clutch is 10 KW at 550 rpm.

The mean diameter of the active conical sections is 350 mm. Use uniform

wear method.

Question 34:

Find the cone angle of a clutch having a major diameter of 300 mm and

minor diameter of 250 mm and length of contact of 200 mm.

Question 35:

A cone clutch is to transmit 30 KW at 1250 rpm. The face angle of the

cone clutch is 12.5° and the mean diameter is to be 355 mm. The

coefficient of friction between the contacting surfaces is 0.20 and the

maximum normal pressure is 83 Kpa. Determine the axial force in KN

required to transmit the power

Question 36:

A multiple disc clutch consists of 10 steel discs and 9 bronze discs. The

effective outside and inside diameters are 203 mm and 152 mm

respectively.

If an axial force of 445 N is applied and the shaft turns at

1000 rpm, determine the power transmitted. Assume a coefficient of

friction of 0.25 and base the design on uniform pressure.

Question 37:

Determine the power capacity of a cone clutch under uniform pressure

having 250 mm major diameter, 200 mm minor diameter, length of

contact 115 mm, 800 rpm and f = 0.30 if allowable pressure is 80 Kpa.

Question 38:

A disc clutch has 6 pairs of contacting friction surfaces with an outside

diameter of 200 mm and an inside diameter of 100 mm. The coefficient

of friction of the clutch materials is 0.40 and the axial force is 1500 N.

The shaft speed is 1200 rpm. Find the Hp that can be transmitted by the

clutch assuming uniform pressure.

Question 39:

Find the power capacity of a cone clutch with mean diameter of 250 mm

if the conical elements inclined at 8 degrees and axial force of 450 N. The

rotational force of driver is 400 rpm and the friction is 0.20.

Question 40:

How much torque can a cone clutch transmit if the angle of the conical

elements is 14 degrees. The mean diameter of conical sections is 250

mm and an axial force of 800 N is applied. Consider a coefficient of

friction of 0.45.

Question 41:

A Pajero jeep wagon's engine develops 40 KW at 1200 rpm, with a single

plate clutch having two pairs of friction surfaces transmitting the power.

Consider the coefficient of friction to be 0.30 and the mean diameter of

discs to be 200 mm. Determine the axial force required to engage the

clutch and to transmit the power.

Question 42:

A cone clutch is to transmit 30 KW at 1250 rpm. The face angle of the

cone clutch is 12.5° and the mean diameter is to be 355 mm. The

coefficient of friction between the contacting surfaces is 0.20 and the

maximum normal pressure is 83 Kpa. Determine the torque in KN-m that

can be transmitted

Question 43:

A simple disc clutch has an outside diameter of 200 mm and inside

diameter of 100 mm. The friction is 0.40 and applied load is 2,500 N. Find

the torque transmitted using uniform wear.

Question 44:

The frictional radius of a disc in a new clutch having d = 8 in and D = 10 in is:

Question 45:

A driving sprocket with 12 teeth drives another sprocket with 40 teeth by

means of a chain having a pitch of½ in. If chain length is 80 in, find the

center distance between sprockets.

Question 46:

A pump that operates a head of 35 m is used to deliver 90 liters per

second of water at an efficiency of 85%. The pump is driven by a diesel

engine by means of chain and sprocket with a service factor of 1.2. If

horsepower per strand is 28, find the approximate number of strands

needed.

Question 47:

n chain of ordinary proportions, the term RC 60 means a pitch of __

Question 48:

A sprocket with 6 in diameter and pitch of¾ in drives another sprocket at

standard center distance of 48 pitches. Find the diameter of larger

sprocket.

Question 49:

A chain and sprocket has 30 teeth with chain pitch of½ in. If the sprocket

turns at 400 rpm, find the speed of chain.

Question 50:

A motor transmits 40 hp to an air conditioning apparatus by means of a

roller chain. The motor runs at 720 rpm. The pitch diameter of the

sprocket on the motor should not exceed 6 ¾ in.

If the drive calls for a

service factor of 1.2 and a chain pitch of 1 in, determine the number of

teeth of the small sprocket.

Question 51:

A roller chain and sprocket is to drive a vertical centrifugal discharge

bucket elevator. The pitch of chain connecting sprockets is 1.75". The

driving sprocket is rotating at 120 rpm and has 11 teeth while the driven

sprocket is rotating at 38 rpm. Determine the number of teeth of driven

sprocket.

Question 52:

Find the standard distance between sprocket having 6 in and 16 in

diameters.

Question 53:

he chain speed of an RC 80 chain on a 21-tooth sprocket turning at 600 rpm is ____

Question 54:

What maximum chain number can be used if the small sprocket is to run

at 1200 rpm?