Questions
82
Oil in journal bearing should be applied at the point where load is
Answer: nil or lightest
83
In hydrostatic bearings
Answer: the oil film is maintained by supplying oil under pressure
84
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
Answer: 1 micron
85
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by
Answer: ZN/p
87
In hydrodynamic bearings
Answer: the oil film pressure is generated only by the rotation of the journal
88
If two springs are in parallel then their overall stiffness will be
Answer: double
93
Which of the following pipe joints would be suitable for pipes carrying steam
Answer: expansion
94
The piston rod of a steam engine is usually connected to the crosshead by means of
Answer: cotter joint
96
When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads
Answer: tension
97
Castle nut is a locking device in which
Answer: through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end
98
The shear plane in case of bolts should
Answer: never be across the threaded portion
99
A backing ring is used inside the pipe joint when making a
Answer: butt weld
100
The strap end of a connecting rod of steam engine is joined by
Answer: gib of cotter joint
