Mechanical Engineering Written Test Questions And Answers Pdf

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Mention the function of intermediate stage in a generalised measurement system. What is a signal flow graph? A signal flow graph of a system is a graphical model in which nodes represent the system variables and directed branches between the nodes represent relationship between the variables.

Some of the best mechanical engineers have been creating things their entire lives. Exploring a candidate's history with engineering can reveal their passion for the field, even if they were using household items as a child to build something small. What to look for in an answer:.

Following are frequently asked mechanical engineering interview questions for freshers as well as experienced engineering candidates. The second law of thermodynamic depicts that the total entropy of an isolated system can never reduce over time. The shear center is a center where the force can act with no twist, whereas elastic center is located at the center of gravity.

MECHANICAL ENGINEERING IMPORTANT MCQ PDF

Mention the function of intermediate stage in a generalised measurement system. What is a signal flow graph? A signal flow graph of a system is a graphical model in which nodes represent the system variables and directed branches between the nodes represent relationship between the variables.

In a signal flow graph, a forward path originates from the input mode and terminates at output mode without encountering any mode more than once. Explain the difference between rotational and irrotational flow. In rotational flow the vorticity is non zero and in irrotational flow it is zero. Define the term stability of a feed back control system? A system is said to be stable if the output of a system after fluctuations, variations or oscilla-tions, settles at a reasonable value for any change in input.

What is meant by precision? Precision is defined as the ability of instrument to reproduce a certain set of readings within a given accuracy. What is boundary layer? Boundary layer is the fluid layer in the neighbourhood of a solid boundary where the effects of fluid friction are predominant. On what account the boundry layer exists?

Boundary layer m fluid flow exists on account of fluid density. Explain the difference between laminar flow and turbulent flow. Turbulent flow is characterised by random and erratic movements of fluid particles resulting in formation of eddies. What is the difference between path line and stream line? A path line is a curve traced by a single fluid particle during its motion. A stream line is an imaginary line drawn in a flow field such that a tangent drawn at any point on this line represents the direction of the velocity vector.

There is no flow across the stream line. What is the difference between steady and unsteady flow? In steady flow the velocity at a given point does not change with time whereas in unsteady flow it changes with time. What is stagnation point and stagnation pressure? A stagnation point is one at which velocity is zero.

Stagnation pressure is the sum of static pressure and dynamic pressure. What is the hydraulic-grade line? It is the line which shows tne variation of piezometric head. Under what condition the thickness of thermal boundary layer and hydrody-namic boundary layer is same?

When Prandtl number is equal to unity. What keeps the shaft in floating condition in hydrodynamic journal bearing? Hydrodynamic pressure developed in the lubricant.

Why the elements of higher pairs must be force closed? This is necessary to provide completely constrained motion. What is the value of coefficient of friction for ball bearing? Ans: 0. Why belts are subject to creep? Due to uneven extension and contraction of belt. What is the ratio of damping coefficient to critical damping coefficient called? Damping factor. In which type of lubrication the starting friction is low?

In hydrostatic lubrication. Ans: Yes. How the stability of empty ship increased. By adding ballasts at the bottom level. Define Froude number. It is the square root of ratio of inertia force to gravity force. It is used to determine velocity of flow in pipe. What is the maximum efficiency of power transmission through a pipe? What is the necessary and sufficient condition for bodies in floatation to be in stable equilibrium?

Centre of gravity of body should be located below metacentre. Under what condition the thermal boundary layer thickness will be equal to the hydrodynamic boundary layer thickness? How laminar boundary layer thickness varies on a flat plate? It is proportional to the square root of the distance from the leading edge.

Name the axial flow reaction turbine with adjustable vanes. Kaplan turbine. Define the degree of reaction of a turbomachine. It is the ratio of total pressure change in the rotor to that in the stage.

What is meant by relative stability? If the system is found to be stable, then it is necessary to know the stable strength or degree of stability which is called relative stability. Phase margin and gain margins are the measures of relative stability. On what factors the efficiency of a centrifugal pump depends? The efficiency of a centrifugal pump depends on size, speed and type number. Define transducer? Transducer is an element which converts the signal from one physical form to another without changing the information content of the signal.

Ans: mm. Why thin-plate orifice is frequently recommended for flow measurement in most of the cases? It is recommended because of its high accuracy, low cost, and extreme flexibility. How the water flow from a hydrant in a city water system measured? It can be measured by allowing the flow of water from a hydrant and noting down the horizontal distance x where jet strikes the ground and the vertical distance y of outlet from ground.

For the same size, length and condition of pipe, how the friction head loss changes if pipe size is varied. Under same flow conditions the friction head loss increases as the size change to the 4. How does the capacity changes in pipe flow with increase in pipe diameter if head is constant? At constant head, capacity is proportional to d How does the head change in pipe flow with change in diameter, if capacity is constant. At constant capacity, head is proportional to.

How head varies in pipe flow with change in flow, if pipe diameter is same. At constant diameter, head is proportional to flow 2. Define the term contraction coefficient. The ratio of area of jet contracted and the cross section of the orifice.

What for pycnometer is used? Pycnometer is used to measure specific gravity of the liquid. Name various functional elements of an instrumental system? Name the three stages of a generalised measuring system. How is a Pelton turbine braked? A pelton wheel is braked by a nozzle directing a jet on the back of the buckets.

What is static pressure? How is it measured. The pressure caused on the walls of a pipe due to a fluid at rest inside the pipe or due to the flow of a fluid parallel to walls of the pipe is called static pressure. This static pressure is measured by inserting a pressure measuring tube into the pipe carrying the fluid so that the tube is at right angle to the fluid flow path. What are the requirements of a control system?

Stability, accuracy and speed of response are the three requirements of control system. What is the difference between weir, and submerged weir. Any obstruction of a streamflow over which water flows is weir.

When the downstream water level rises over the weir crest, it is called submerged weir. What is the difference between spillway and siphon spillway? Spillway is an essential part of a large dam and provides an efficient and safe means of releasing flood water that exceeds the design capacity of the reservoir.

Siphon spillway is spillway designed to discharge water in a closed conduit under negative pressure. What is the difference between culverts, stilling basin, and standpipe?

Culverts are built at the points of lowest valley to pass water across the embankments of highways or railroads.

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MECHANICAL ENGINEERING IMPORTANT MCQ PDF

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