(1/2) × √(σ² + 4τ²)
√(σ² + 4τ²)
(1/2) × [σ + √(σ² + 4τ²)]
σ + √(σ² + 4τ²)
A. (1/2) × √(σ² + 4τ²)
Both the ends fixed
Both the ends hinged
One end fixed and the other end hinged
One end fixed and the other end free
Shoe brake
Band and block brake
Band brake
Internal expanding brake
1100 to 1300°C
1300 to 1500°C
500 to 600°C
700 to 900°C
Be across threaded portion of shank
Be parallel to axis of bolt
Be normal to threaded portion of shank
Never be across the threaded portion
Plastic materials
Brittle materials
Non-ferrous materials
Ductile materials
Tearing strength of plate (Pt)
Shearing strength of rivet (Ps)
Crushing strength of rivet (Pc)
Least value of Pt Ps and Pc
8
6
4
10
[(√P1 + √P2)/2]²
P1 + P2
2 × (P1 + P2)
[2 × (P1 + P2)] + Pc Where Pc is centrifugal tension
29°
55°
47.3°
60°
The oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant
Grease is used for lubrication
T/2
T
2T
4T
Tensile stress
Compressive stress
Shear stress
Bending stress
An axial compressive force
A tangential force
An axial tensile force
Any one of these
Half
Same
Double
None of the above
Open belt drive transmits more power than crossed belt drive
Crossed belt drive transmits more power than open belt drive
Open and crossed belt drives transmit same power
Power transmission does not depend upon open and crossed types of constructions
Increases linearly
Decreases linearly
Remains same
Increases exponentially
Combined loading
Fatigue
Thermal stresses
Shock loading
340 to 360
420 to 450
More than 400
300 to 320
Screw jack
Aeroplane engines
Crane
Steering mechanism
√(Pmax / 2m)
√(Pmax / 3m)
√(Pmax / m)
√(3m /Pmax) Where m = mass of belt per metre (kg/m) Pmax = maximum permissible tension in belt (N)
1 kN-m
2 kN-m
3 kN-m
4 kN-m
Uniform velocity
Simple harmonic motion
Uniform acceleration and retardation
Cycloidal motion
90
60
120
100
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Brown colour
Yellow colour
White colour
Grey colour
Increases
Decreases
Remains constant
None of these
Provide cushioning effect
Provide bearing area
Absorb shocks and vibrations
Provide smooth surface in place of rough surface
Screw cutting lathes
Feed mechanisms
Spindles of bench vices
Railway carriage couplings
Static load
Dynamic load
Static as well as dynamic load
Completely reversed load
Effective tension is equal to centrifugal tension
Effective tension is half of centrifugal tension
Driving tension on slack side is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension