In Parson’s reaction turbines, the velocity diagram triangles at inlet and outlet are which of the following :
-
Solution
In Parson’s reaction turbine, the inlet and outlet velocity diagrams are congrunt as shown below.
In the above figure,α1 = b2, α2 = b1
The standard atmospheric is 762 mm of Hg. At a specific location, the barometer reads 700 mm of Hg. At this place,what does an absolute pressure of 380mm of Hg correspond to ?
-
Solution
Given: Standard atmospheric pressure (Patm) = 762 mm of Barometric pressure (Pb) = 700 mm of Hg
Absolute pressure (Pabsolute) = 380 mm
Absolute pressure correspond to Pb – Pabsolute
= 700 – 380
= 320 mm of Hg vacuum
If Pv is the partial pressure of vapour, Ps is the partial pressure of vapour for saturated air and Pb is the barometric pressure, then the relationship between relative humidity (φ) and degree of saturation (μ) given by:
-
Solution
\(\mu =\left ( \frac{P_{b}-P_{s}}{P_{b}-P_{v}} \right )\)
where, Pb= barometric pressure
Ps= saturated air pressure (partial)
Pv= partial pressure of vapour
φ= relative humidity
For n opaque plane surface, the irradiation, radiosity and emissive power are respectively 20, 12 and 10 w/m2. The emissivity of the surface will be ………………..
-
Solution
The change in specific entropy of a system undergoing a reversible process is given by :
S2– S1= (CP– CV) in (V2 / V1)
This is valid for :
-
Solution
The change in specific entropy of a system in isothermal process undergone by anideal gas.
A shop owner with an annual constant demand of aunit has ordering costs of ₹ P per order and carrying costs ₹ I per unit per year. The economic order quantity (EOQ) fora purchasing model having no shortage may be determined from :
-
Solution
EOQ = \(\sqrt{\frac{2AP}{I}}\)
where, P= ordering cost/order
I= carrying cost/unit/year
A= Annual demand
Match List-I with List-II
List-I List-II
A.Lathe 1.Push tool
B.Drilling machine 2.Ratchet and Pawl
mechanism
C.Shaper 3.Dividing Head
D.Broaching machine 4.Hollow taperd spindle
5.Face plate
-
Solution
Lathe = Face plate
Drilling machine = Hollow tapered spindle
Shaper = Rachet and Paul mechanism
Broaching machine = Push tool
Cutting tool material 18-4-1 HSS has which one of the following compositions ?
-
Solution
18 : 4 : 1 High speed steel (HSS) has the following composition, 18% tungsten, 4% chromium, 1%vanadium with a carbon content of 0.6-0.7%
The eutectoid carbon in iron, above lower critical temperature, when cooled, results in
-
Solution
In the eutectoid reaction of carbon above lower critical temperature, the micro-constituent austerite is decomposed into ferrite and cementite.
Toughness of mild steel under uniaxial tensile loading is given by the shaded portion of the stress-strain diagram as shown in :
-
Solution
Toughness of material is represented by total area covered by stress-strain diagram.