01 ) In elliptical trammels
Two pairs are turning and other two sliding
Explanation:
Elliptical Trammel is an inversion of double crank chain mechanism. A double slider crank chain consists of four links forming two sliding pairs and two turning pairs.
02 ) The damping ratio in case of critical damping is…………………….
Equal to one.
03 ) A differential gear in an automobile is a
epicyclic gear train.
04 ) The intensity of pressure at a depth h is equal to
specific weight × depth.
05 ) The transmission angle is minimum and maximum respectively, when the crank angle with the fixed link is
0° and 180°.
06 ) According to Kennedy’s theorem, the instantaneous centres of three bodies having relative motion lie on a
straight line.
07 ) The principle by which the material enters into the gap between workpiece in case of soldering as well as brazing is
Capillary action.
08 ) In thermit welding, the thermit is the mixture of Aluminum powder and Iron oxide. where, aluminium act as
Reducing agent.
Explanation:
Its use is to repair railway trac.
09 ) The use of chaplets in foundry practice are
to support the core.
10 ) The casting process which is used for production of hollow pipes?
Centrifugal casting.
Explanation:
Centrifugal casting is the process in which the mould is rotated rapidly about its central axis as the molten metal is poured into it.
11 ) Strain rosettes are generally used for
measurement of longitudinal strain.
12 ) Pearlite is a
Combination of Ferrite and cementite.
Explanation:
Pearlite is combination of of 87% ferrite which is thick layer and 13% cementite which thin layer and are arranged alternatively in a lamella formation.
13 ) Which is the best option to avoid knock in SI engine?
Self-ignition delay period should high
Explanation:
For avoid knocking in SI engine.
Supercharging should be avoided.
Self-ignition delay period should be high.
Spark should be retarded.
14 ) The point of contraflexure is a point where
bending moment changes sign.
Explanation:
At the point of contraflexure bending moment is zero i.e Bending moment changes sign.
15 ) The lowest temperature at which the oil ceases to flow cooled is known as ____________.
Cloud point.
Explanation:
Cloud point It is the temperature below which wax in diesel forms a cloudy appearance. This wax thickens the oil and clogs fuel filters and injectors in engine.
Pour point : It is the minimum temperature at which a lubricant turns into semi solid and almost losses its flow characteristics.
Flash point : For a flammable liquid, it is the minimum temperature at which there are enough vapors of the liquid to ignite when a heat source is brought near it.
Fire point : For a fuel, it is the lowest temperature at which the vapor of that fuel will continue to burn for at least 5 seconds after ignition source removed.
16 ) For diesel engine, the method of governing employed is
Quality governing.
Explanation:
For diesel engine, the method of governing employed is quality governing. Governing means the action of varying the fuel supply in accordance with the load demands so that the engine runs at practically constant speed. Some important methods of governing of IC engines.
1. Hit and miss governing: This method is suitable for small gas engines. In this system of governing, whenever the engine starts running at higher speed (due to decreased load), some explosions are omitted or missed. This is done with the help of a centrifugal governor.
2. Qualitative governing: In this system of governing, a control valve is fitted in the fuel delivery pipe which controls the quantity of fuel to be mixed in the charge. The movement of control valve is regulated by the centrifugal governor through rack and pinion arrangement.
3. Quantitative governing: In this system of governing, the quality of charge (i.e. air-fuel ratio of the mixture) is kept constant, but the quantity of mixture supplied to the engine cylinder is varied by means of a throttle valve which is regulated by the centrifugal governor through rack and pinion arrangement.
17 ) The output of a diesel engine can be increased without increasing the engine revolution or size in following way
by supercharging.
Explanation:
A supercharger is an air compressor that increases the pressure or density of air supplied to an internal combustion engine. This gives each intake cycle of the engine more oxygen, letting it burn more fuel and do more work, so increasing power.
18 ) The door of a running refrigerator inside a room was left open then what happen?
the roam will be gradually warmed up.
19 ) Why is multi-staging in centrifugal pump used?
For high head.
20 ) A draft tube is used in a reaction turbine
To convert residual kinetic energy into pressure energy.
Explanation:
A draft tube is used in a reaction turbine to convert residual kinetic energy into pressure energy.
21 ) The property of a fluid which enables it to resist tensile stress is known as
cohesion.
Explanation:
The intermolecular attraction force between same type of molecules is called cohesion.
22 ) Carbonisation of coal is the process of
strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel.
Explanation:
Coal carbonization is used for processing of coal to produce coke using metallurgical grade coal. Coal carbonization involves heating of coal in the absence of air.
23 ) According to Lami’s theorem
if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two.
24 ) Two coplanar couples having equal and opposite moments
cannot balance each other.
25 ) Load acting on bearing in its plane of rotation is called as
__________
radial load.
26 ) Cellular manufacturing is suitable for
products with similar features made in batches.
27 ) A slider moving on a curved surface will have its instantaneous centre-
at the center of curvature.
28 ) Reversible adiabatic process is also called
Isentropic process.
Explanation:
It is an idealized thermodynamic process which is adiabatic and in which the work transfers of the system are frictionless; there is no transfer of heat or of matter and the process is reversible.
29 ) Hart mechanism has
six links.
30 ) A graphical representation of the coordinated activities (fundamental motions) of an operator’s body members, on a common time scale is known as
SIMO chart.
Explanation:
SIMO chart is based on film analysis used to record therbligs or a group of therbligs performed by different body members of one or more workers simultaneously on a common time scale.
Two handed process chart is a chart in which the activities of a workers hand are recorded in their relationship to each other.
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