7th week Flashcards
1
Q
The steam turbine foundation should be designed to support the machine load plus how many percent for impact, condenser load, floor loads and dead loads?
a. ) 15
b. ) 25
c. ) 20
d. ) 30
A
25
2
Q
A flash steam cycle can be used if the hot water temperature is approximately __
a. ) 165 C or higher
b. ) 145 C to 200 C
c. ) 150C or higher
d. ) below 200 C
A
165 C or higher
3
Q
The minimum vertical distance from the floor or soil level to the top edge of the foundation must be around __
a. ) 150 mm
b. ) 200 mm
c. ) 100 mm
d. ) 120 mm
A
120 mm
4
Q
The maximum unit pressure of turbine and generator on the reinforced concrete should not exceed
a. ) 17.62 kg/cm2
b. ) 16.62 kg/cm2
c. ) 18.62 kg/cm2
d. ) 19.62 kg/cm2
A
17.62 kg/cm2
5
Q
To eliminate transmissions of vibration, the foundation should be isolated from floor slabs or building footings at least how many mm around its perimeter?
a. ) 15
b. ) 25
c. ) 20
d. ) 30
A
25
6
Q
Chimneys that rely on natural draft are sometimes referred to as ___
a. ) natural chimney
b. ) normal chimney
c. ) gravity chimney
d. ) stack
A
Gravity chimney
7
Q
Force draft fans create a positive pressure of __
a. ) 0.5 to 2.5 kPa
b. ) 2.0 to 4.0 kPa
c. ) 1.0 to 3.0 kPa
d. ) 0.2 to 2.2 kPa
A
0.5 to 2.5 kPa
8
Q
Fans that are used to draw combustion products through the furnace bed, stack, and pollution control system by injecting air into the stack after combustion.
a. ) natural draft
b. ) induced draft
c. ) forced draft
d. ) balanced draft
A
Forced draft
9
Q
For a diesel engine’s foundation, in pouring a concrete mixture, it should be poured ___
a. ) one time
b. ) three times
c. ) two times
d. ) four times
A
One time
10
Q
Concrete foundation should have steel bar reinforcements placed vertically and horizontally to avoid __
a. ) breaking
b. ) melting
c. ) thermal cracking
d. ) vibration
A
Thermal cracking
11
Q
The machine foundation must have a factor safety of
a. ) 4
b. ) 6
c. ) 5
d. ) 7
A
5
12
Q
There shall be no foundation bolts less than __
a. ) 12 mm in diameter
b. ) 16 mm in diameter
c. ) 18 mm in diameter
d. ) 20 mm in diameter
A
12 mm in diameter
13
Q
Foundation bolt length should be at least how many times the anchor bolt diameter?
a. ) 16 times
b. ) 20 times
c. ) 18 times
d. ) 30 times
A
18 times
14
Q
The diesel engine foundation safe soil bearing pressure is __
a. ) 4,890 kg/cm2
b. ) 4,490 kg/cm2
c. ) 4,500 kg/cm2
d. ) 4,125 kg/cm2
A
4,890 kg/cm2
15
Q
As a good practical rule, the foundation depth may be taken as how many times of the engine stroke?
a. ) 2.2 to 3.2
b. ) 3.2 to 4.2
c. ) 2.5 to 3.5
d. ) 3.5 to 4.5
A
3.2 to 4.2
16
Q
To secure the belts embedded within the foundation, the distance of the edges of the foundation from the bedplate must be __
a. ) 120 mm to 300 mm
b. ) 100 mm to 280 mm
c. ) 150 mm to 330 mm
d. ) 200 mm to 380 mm
A
120 mm to 300 mm
17
Q
The weight of the machine foundation is how many times of the weight of the engine?
a. ) 4 to 5 times
b. ) 2 to 3 times
c. ) 3 to 5 times
d. ) 4 to 6 times
A
3 to 5 times
18
Q
For stability, the total combined engine, driven equipment, and foundation center of gravity must be kept __
a. ) below the foundations top
b. ) above the foundations top
c. ) 120 mm above the foundations top
d. ) none of the above
A
Below the foundations top
19
Q
The weight of steel bar reinforcements should be how many times the weight of the foundation?
a. ) 1/2% to 1%
b. ) 3% to 5%
c. ) 1% to 1.5%
d. ) 3.2% to 4.2%
A
1/2% to 1%
20
Q
Foundation bolts of specified size should be used and surrounded by a pipe sleeve with an inside diameter of at least how many times the diameter of the anchor bolt?
a. ) 3
b. ) 5
c. ) 4
d. ) 6
A
3
21
Q
For foundations of steam turbine, the concrete mixture should be __
a. ) 1:2:4
b. ) 1:2:3
c. ) 1:3:5
d. ) 1:3:4
A
1:2:4
22
Q
Forced draft fans are run at relatively high speeds in the range of:
a. ) 1200 to 1800 rpm
b. ) 1500 to 2000 rpm
c. ) 1000 to 1600 rpm
d. ) 900 to 1500 rpm
A
1200 to 1800 rpm
23
Q
In order to keep combustion products inside the combustion chamber and stack system, balanced draft system may actually operate with a slight
a. ) negative pressure
b. ) positive and negative pressure
c. ) positive pressure
d. ) absolute pressure
A
Negative pressure
24
Q
The static pressure drop due to friction through the boiler and stack.
a. ) draft loss
b. ) stack effect
c. ) available draft
d. ) fan boost
A
Draft loss
25
The difference between the theoretical draft and the draft loss.
a. ) draft loos
b. ) stack effect
c. ) available draft
d. ) fan boost
Available draft
26
In a balanced system, the available draft is __
a. ) unity
b. ) 100
c. ) zero
d. ) infinite
Zero
27
The total pressure supplied by the fan at maximum operating conditions.
a. ) net rating or fan boost
b. ) draft loss
c. ) available draft
d. ) stack effect
Net rating or fan boost
28
Generally the higher the chimney, __
a. ) the smaller the stack effect
b. ) the greater the stack effect
c. ) stack effect is zero
d. ) stack effect approaches unity
The greater the stack effect
29
Modern stacks are seldom built higher than __
a. ) 60 m
b. ) 40 m
c. ) 50 m
d. ) 30 m
60 m
30
Most stacks are built of height less than __
a. ) 60 m
b. ) 40 m
c. ) 50 m
d. ) 30 m
30 m
31
For realistic problems, the achievable stack effect probably should be considered to be __
a. ) 75%of the ideal
b. ) equal to the ideal
c. ) 80% of the ideal
d. ) half of the ideal
80% of the ideal
32
Guyed stacks seldom exceed __
a. ) 1.83 m in diameter
b. ) 1.45 m in diameter
c. ) 2.83 m in diameter
d. ) 2.45 m in diameter
1.83 m in diameter
33
The angle between the stack and the guy wire is usually __
a. ) 30 degrees
b. ) 60 degrees
c. ) 45 degrees
d. ) 75 degrees
60 degrees
34
Guyed stacks height seldom exceed __
a. ) 30.48 m
b. ) 43.80 m
c. ) 34.80 m
d. ) 48.30
30.48 m
35
Foundations should be isolated from floor slabs or building footings by at least how many mm to eliminate transmission of vibration.
a. ) 25 mm
b. ) 35 mm
c. ) 15 mm
d. ) 45 mm
25 mm
36
Foundation bolts of specified size should be used and surrounded by a pipe sleeve with an inside diameter of at least how many times the diameter of the anchor bolt?
a. ) 3
b. ) 5
c. ) 4
d. ) 6
3
37
Foundation bolts of specified size should be used and surrounded by a pipe sleeve with a length of at least how many times the diameter of the bolt?
a. ) 18
b. ) 15
c. ) 14
d. ) 16
18
38
Foundation should be designed to support the machine load plus how many percent for impact, condenser load, floor loads, and dead loads?
a. ) 25
b. ) 15
c. ) 34
d. ) 36
25
39
Guys are usually applied in how many sets?
a. ) 1 to 3
b. ) 3 to 5
c. ) 2 to 4
d. ) 4 to 6
1 to 3
40
Solar energy arrives at the outside of the earth's atmosphere at an average rate of __
a. ) 1.354 kW/m2
b. ) 2.354 kW/m2
d. ) 1.543 kW/m2
d. ) 2.543 kW/m2
1.354 kW/m2
41
How many percent of solar energy survives absorption and reflection?
a. ) 40 to 70%
b. ) 50 to 80%
c. ) 30 to 60%
d. ) 20 to 50%
40 to 70%
42
Practical and economic issues limit tower electric systems to approximately:
a. ) 100 to 200 MW
b. ) 100 to 300 MW
c. ) 150 to 250 MW
d. ) 150 to 400 MW
100 to 300 MW
43
Thermal efficiency of a geothermal power plant is approximately:
a. ) 30%
b. ) 35%
c. ) 22%
d. ) 15%
22%
44
Fans located before the furnace that are used to supply air for burning.
a. ) natural draft
b. ) induced draft
c. ) forced draft
d. ) balanced draft
Forced draft
45
In heat exchanger design, one transfer unit implies:
a. ) one fluid which is exchanging with another fluid of the same chemical composition
b. ) the section of heat exchanger which will cause temperature drop of one degree centigrade
c. ) the section of heat exchanger where heat transfer surface area has been one square meter
d. ) condition when the change in temperature of one steam is numerically equal to the average driving force
Condition when the change in temperature of one steam is numerically equal to the average driving force
46
What is thermal diffusivity?
a. ) a mathematical formula
b. ) a physical property of the material
c. ) configuration for heat conduction
d. ) a dimensionless parameter
a physical property of the material
47
Which of the following is a unit of thermal diffusivity?
a. ) m^2/hr
b. ) kcal/m^-hr-C
c. ) kcal/m^2-hr
d. ) m^2/hr-C
m^2/hr
48
All heat transfer processes require a medium of energy exchange except:
a. ) conduction
b. ) forced convection
c. ) natural convection
d. ) radiation
Radiation
49
It refers to the ratio of the internal thermal resistance of a solid to the boundary layer thermal resistance (or external resistance of the body).
a. ) Biot number
b. ) Nusselt number
c. ) Prandtl number
d. ) Reynolds number
Biot number
50
Least value of Prandt'l number can be expected in case of __
a. ) liquid metals
b. ) salt solution
c. ) sugar solution
d. ) water
Liquid metals
51
The statement that the emissivity and absorptivity of a surface is surrounded by its own temperature are the same for both monochromatic and total radiation is called:
a. ) Lambert's law
b. ) D' Alambart's
c. ) Kirchoff's law
d. ) Law of emissivity
Kirchoff's Law
52
What is the usual value of transmissivity for opaque materials?
a. ) 0
b. ) 1
c. ) indeterminate
d. ) infinity
0
53
What do you call the first stage of crystal formation?
a. ) nucleation
b. ) separation
c. ) foaming
d. ) vortexing
Nucleation
54
How do you classify a body that has an emissivity factor of 0.7?
a. ) Gray body
b. ) White body
c. ) Black body
d. ) Theoretical body
Gray body
55
Which of the following is used as entrainer in acetic acid - water separation?
a. ) methyl alcohol
b. ) butyl acetate
c. ) phosphorous
d. ) hexane
Butyl acetate
56
"The boiling point of a solution is a linear function of water at the same pressure." The above statement is called ___
a. ) Dubring's rule
b. ) Fick's rule
c. ) Petit and Dulong's law
d. ) Reynolds law
Dubring's rule
57
In sugar mills can just is evaporated in:
a. ) zigzag tube evaporators
b. ) long vertical tube evaporators
c. ) short vertical tube evaporators
d. ) horizontal tube evaporator
Short vertical tube evaporators
58
What do you call a substance that is able to absorb liquids or gases and is usually used for removing liquids (or gases) from a given medium or region?
a. ) Absorbent
b. ) Adsorbent
c. ) Liquifier
d. ) Adhesive
Absorbent
59
Dritus Boelter equation can be applied in case of fluids flowing in __
a. ) transition region
b. ) laminar region
c. ) turbulent region
d. ) any of the above
Turbulent region
60
Which of the following requires the greatest amount of heat per kilogram for a given increase in temperature?
a. ) ice
b. ) steam
c. ) water
d. ) copper
Water
61
What is the value of the Prandt'l number for air?
a. ) 10
b. ) 67
c. ) 6.7
d. ) 0.7
0.7
62
According to Prevost theory of heat exchange:
a. ) it is impossible to transfer heat from low temperature source to high temperature source
b. ) heat transfer by radiation needs no medium
c. ) all bodies above absolute zero emit radiation
d. ) heat transfer in most of the cases occurs by combination of conduction, convection and radiation
All bodies above absolute zero emit radiation
63
A fur coat on an animal will help the animal to remain:
a. ) warm in winter
b. ) warm in summer
c. ) cool in winter
d. ) cool in summer
warm in winter
64
A heavy rotating body which serves as reservoir for absorbing and redistributing kinetic energy.
a. ) shaft
b. ) flywheel
c. ) governor
d. ) puncher
Flywheel
65
The best material for brake drum is __
a. ) cast iron
b. ) aluminum
c. ) steel
d. ) wrought iron
Cast iron
66
An elastic body whose primary function is to deflect under load
a. ) spring
b. ) stopper
c. ) brake
d. ) clutch
Spring
67
It equalizes the energy exerted and the work done thus preventing excessive or sudden changes of speed.
a. ) flywheel
b. ) flywheel pulley
c. ) balance wheel
d. ) all of these
All of these
68
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. ) 10000
c. ) 8000
d. ) 12000
12,000
69
The brake capacity to absorb energy is known as ___
a. ) energy
b. ) resistance brake
c. ) power
d. ) braking torque
Braking torque
70
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. ) band brake
c. ) clutch
d. ) centrifugal brake
Band brake
71
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. ) 0.96 to 0.97
c. ) 0.45 to 0.48
d. ) all of these
0.50 to 0.90%
72
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. ) volute spring
c. ) garter spring
d. ) helical spring
Motor spring
73
What is the recommended coefficient of fluctuation of flywheels for punching, shearing, pressing machine?
a. ) 0.005 - 0.1
b. ) 0.03 - 0.05
c. ) 0.007 - 0.01
d. ) 0.01 - 0.03
0.005 - 0.1
74
The total frictional energy that is stored in the brake parts principally in the drum or disk is approximately:
a. ) 56% up
b. ) 86% up
c. ) 90% up
d. ) 75% up
75% up
75
The cast iron flywheels are commonly designed with a factor of safety of __
a. ) 14 to 15
b. ) 10 to 13
c. ) 8 to 9
d. ) 6 to 12
10 to 13
76
It is a type of coil where the helical coil is wrapped into a circle forming an annular ring.
a. ) volute spring
b. ) motor spring
c. ) hair spring
d. ) garter spring
Garter spring
77
What is the hard drawn (80% reduction) spring wire made of high carbon steel?
a. ) oil tempered wire
b. ) tension wire
c. ) music wire
d. ) chromium wire
Music wire
78
Which of the following wires with good quality and is used for impact loading.
a. ) hard drawn wire
b. ) helical spring wire
c. ) song wire
d. ) chromium - silicon wire
Chromium-silicon wire
79
When heat-treated wire is coiled cold, it should be stress relieved for bending stress and after cooling it is heated at some:
a. ) 400 F
b. ) 700 C
c. ) 600 F
d. ) 500 F
500 F
80
It is the ratio of the mean diameter of coil over the coil diameters.
a. ) Wahl factor
b. ) coil ratio
c. ) spring index
d. ) lead scale
Spring index
81
What is the overall length of the spring when it is compressed until all adjacent coils touched?
a. ) free length
b. ) compressed length
c. ) solid length
d. ) expansion length
Solid length
82
It is the length of a coil spring under no load.
a. ) compressed length
b. ) solid height
c. ) free length
d. ) none of these
Free length
83
In general, the steel springs are made of relatively of relative high carbon steel usually:
a. ) 5%
b. ) more than 0.5%
c. ) less than 0.5%
d. ) 7.5%
more than 0.5%
84
It is a low cost spring material, suitable where service is not severe and dimensional precision is not needed.
a. ) helical spring wire
b. ) hard drawn wire spring
c. ) stainless steel
d. ) copper
Hard drawn wire spring
85
Which of the following is the type of spring made in the form of dished washer?
a. ) air spring
b. ) volute spring
c. ) bellevile spring
d. ) motor spring
Bellevile spring
86
The percentage difference in solid and working deflections is known as:
a. ) clash allowance
b. ) spring allowance
c. ) spring rate
d. ) spring index
Clash allowance
87
Which of the following is used to change the direction of an applied tensile force?
a. ) Gears
b. ) Pulleys
c. ) Flywheels
d. ) Ropes
Pulleys
88
The relationship between the extension of a spring and the force required to produce the extension is:
a. ) F = ma
b. ) F =mv^2/R
c. ) F = uN
d. ) F = kx
F = kx
89
The deflection of a beam is ___
a. ) directly proportional to the modulus of elasticity and moment of inertia
b. ) inversely proportional to the modulus of elasticity and length of the beam cubed
c. ) inversely proportional to the modulus of elasticity and moment of inertia
d. ) inversely proportional to the weight and length
inversely proportional to the modulus of elasticity and moment of inertia
90
Length of contact between two mating parts in a screw and nut threads measured axially is called ___
a. ) arc of contact
b. ) length of engagement
c. ) depth of engagement
d. ) axis of contact
Length of engagement
91
Surface connecting the crest and roots of the screw thread.
a. ) lead angle
b. ) top land
c. ) length of engagement
d. ) flank
Flank
92
A bolt for general application that posses a stronger thread is a type of ____ screw.
a. ) BUN
b. ) UNEF
c. ) UNC
d. ) WOOD
UNC
93
What is the recommended speed for leather belts?
a. ) 6000 to 7000 fpm
b. ) 7000 to 8000 fpm
c. ) 5000 to 6000 fpm
d. ) 4500 to 5600 fpm
7000 to 8000 fpm
94
What is the usual recommended speed for fabric belts?
a. ) 4000 to 5000 fpm
b. ) 2000 to 3000 fpm
c. ) 3000 to 4000 fpm
d. ) 2000 and more fpm
2000 and more fpm
95
Which of the following is the recommended initial tension of the belt?
a. ) 75 lb/in of width
b. ) 71 lb/in of width
c. ) 73 lb/in of width
d. ) 80 lb/in of width
71 lb/in of width
96
Flat belt that is too tight will induce strain on the bearing and belt ___
a. ) life will be shortened
b. ) result to uneconomical operation
c. ) suffer/shatter
d. ) will be sheared/ cut
Life will be shortened
97
For longer sprocket chain life. the speed range of ___ fpm is recommended.
a. ) 1200 - 1400
b. ) 1800 - 2000
c. ) 1500 - 1600
d. ) 2000 - 2100
1200 - 1400
98
The breaking strength of oak-tanned beltings varies from 3 to more than:
a. ) 5 ksi
b. ) 7 ksi
c. ) 6 ksi
d. ) 9 ksi
6 ksi
99
Experience suggests that the most economical designs are obtained for a belt speed of:
a. ) 6000 to 7500 fpm
b. ) 3500 to 4700 fpm
c. ) 3000 to 5000 fpm
d. ) 5000 to 1000 fpm
6000 to 7500 fpm
100
As recommended, the center to center distance between sprockets should not be less than ___ times the bigger sprocket.
a. ) 2.216
b. ) 1 3/4
c. ) 1 1/2
d. ) 2.59
1 1/2
101
The tension in the belt due to centrifugal force increasing rapidly above about:
a. ) 2500 fpm
b. ) 3500 fpm
c. ) 3000 fpm
d. ) 4000 fpm
2500 fpm
102
A ___ chain is an assembly of lines and joints.
a. ) dynamic
b. ) sprocket
c. ) kinetic
d. ) static
Sprocket
103
For large speed ratio and large sprocket utilized it is recommended cast ___ material since the large sprocket teeth are having fewer engagement.
a. ) alloyed steel
b. ) iron
c. ) heat treated steel
d. ) malleable iron
iron
104
It is the angle between a tangent to the pitch helix and plane normal to the axis of the screw.
a. ) helix angle
b. ) tangent angle
c. ) lead angle
d. ) vertical angle
Lead angle
105
The crest diameter of a screw thread is same as ___
a. ) pitch diameter
b. ) major diameter
c. ) minor diameter
d. ) base diameter
Major diameter
106
Belt slip may take place because of ___
a. ) loose load
b. ) driving pulley too small
c. ) heavy belt
d. ) all of the above
All of the above
107
Which of the type of chain is used in motorcycle?
a. ) silent
b. ) bush roller
c. ) pintle
d. ) long
Bush roller
108
A kinematic chain needs a minimum ___
a. ) 2 links and 2 turning pairs
b. ) 4 links and 4 turning pairs
c. ) 3 links and turning pairs
d. ) 3 links and 2 turning pairs
4 links and 4 turning pairs
109
It is advised that in rubber belts application/mounting, it should have an initial tension of ___ inch/ply.
a. ) 18 to 24
b. ) 12 to 15
c. ) 15 to 20
d. ) 10
15 to 20
110
Considering a maximum safe center distance of sprockets should be ___ pitches. Very long center distance cause catenary tension in the chain.
a. ) 70
b. ) 60
c. ) 80
d. ) 50
80
111
For high speed application the minimum number of teeth in small sprocket should be:
a. ) 18 to 24
b. ) 14 to 18
c. ) 26 to 30
d. ) 24 to 28
18 to 24
112
A single ply leather belt running at a belt velocity of 300 ft/min is likely to transmit ___ per inch of width.
a. ) 2.5 hp
b. ) 4.0 hp
c. ) 3.0 hp
d. ) 5.0 hp
4.0 hp
113
The working load P for a chain for crane applications is expressed in terms of diameter of link "d" in cm as follows.
a. ) P = 1.5d^2
b. ) P = 50d^2
c. ) P = 25d^2
d. ) P = 500d^2
P = 500d^2
114
Flat leathering belt not recommended for use in speed excess of ___ fpm.
a. ) 3600
b. ) 6000
c. ) 48000
d. ) all of these
6000
115
It is recommended not to have a direct drive and drive sprockets if the ratio of their teeth exceeds ___, use two or more step combination.
a. ) 10 times
b. ) 5 times
c. ) 8 times
d. ) 6 times
8 times
116
What type of leather belting should be used at an ambient temperature above 140F and possible acid liquid coming in contact with the belt?
a. ) mineral tanned
b. ) oak tanned
c. ) combination of oak
d. ) non of these
None of these
117
What is the usual density of the leather belt?
a. ) 0.035 lb/in^3
b. ) 0.025 lb/in^3
c. ) 0.0135 lb/in^3
d. ) 0.0465 lb/in^3
0.035 lb/in^3
118
Which of the following is the approximate density of a flat rubber belt?
a. ) 0.055 lb/in^3
b. ) 0.045 lb/in^3
c. ) 0.0135 lb/in^3
d. ) 0.0465 lb/in^3
0.045 lb/in^3
119
It is recommended for high speed application that the minimum number of teeth in small sprocket should be:
a. ) 26 to 30
b. ) 26 to 28
c. ) 12 to 16
d. ) 18 to 24
18 to 24
120
Which of the following describes the "slip" in belt drive?
a. ) loss in power
b. ) difference between the angular velocities of two pulleys
c. ) difference between linear speed of the rim
d. ) difference between the linear speed of the rim of pulley and the belt on it
difference between the linear speed of the rim of pulley and the belt on it
121
Types of V-belts to use in a driving pulley with speed of 360 rpm and transmitting 5 Hp.
a. ) type A belts
b. ) type C belts
c. ) type B belts
d. ) type D belts
type B belts
122
What is the minimum number of teeth on a smaller sprocket for low speed?
a. ) 12
b. ) 17
c. ) 21
d. ) 14
12
123
What is the minimum number of teeth on a smaller sprocket for moderate speed?
a. ) 12
b. ) 17
c. ) 21
d. ) 14
17
124
What is the usual minimum number of teeth on a smaller sprocket for high speed?
a. ) 21
b. ) 12
c. ) 24
d. ) 14
21
125
The recommended net belt pull for rubber belt is:
a. ) 11.34 lb/ply per inch of width
b. ) 13.75 lb/ply per inch of width
c. ) 16.35 lb/ply per inch of width
d. ) 20.34 lb/ply per inch of width
13.75 lb/ply per inch of width
126
For minimum quietness, use sprockets with __ or more teeth.
a. ) 21
b. ) 25
c. ) 23
d. ) 27
27
127
If two intersecting shafts are to be belt connected __ guide pulleys are to be used.
a. ) 1
b. ) 3
c. ) 2
d. ) 4
2
128
Too much ___ in a flat belt operation tend to cause excessive wear slippage and may burn the belt.
a. ) play
b. ) stiffness
c. ) slack
d. ) tightness
Tightness
129
As a rule the center to center distance between sprocket should not be less than __ times the diameter of the bigger sprocket and not less than 30 times the pitch nor more than about 50 times to pitch.
a. ) 1.5
b. ) 2.5
c. ) 2
d. ) 3
1.5
130
Which of the following is not recommended for use in a driving speed exceeding 2000 ft/min?
a. ) Flat leather belt
b. ) Silent sprocket
c. ) Herringbone gear
d. ) V-belt
Flat leather belt
131
Flat leather belting not recommended for used in a speed in excess of ___ fpm
a. ) 3600
b. ) 4800
c. ) 6000
d. ) all of these
6000
132
Pitch diameter less the diameter of the roller chain is equal to:
a. ) top land
b. ) bottom diameter
c. ) addendum
d. ) face overlap
Bottom diameter
133
What type of compound screw which produces a motion equal to the difference in motion between the two component screws.
a. ) Machine screw
b. ) Differential screw
c. ) Tanden screw
d. ) Variable screw
Differential Screw
