Online Mechanical Engineering Test - Mechanical Engineering Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the

top layer

bottom layer

neutral axis

every cross-section

[#]

The maximum bending moment for a simply supported beam with a gradually varying load from zero at both ends and w per metre at the centre, lies at the centre of a beam.

Agree

Disagree

[#]

The pressure measured with the help of a pressure gauge is called

atmospheric pressure

gauge pressure

absolute pressure

mean pressure

[#]

The height of a water column equivalent to a pressure of 0.15 MPa is

15.3 m

25.3 m

35.3 m

45.3 m

[#]

Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as

lift

drag

stagnation pressure

bulk modulus

[#]

If V₁ and V₂ are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

[#]

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

zero

1/5

4/5

[#]

Relation between c_p and c_v is given by (where c_p = Specific heat at constant pressure, c_v = Specific heat at constant volume, γ = c_p/c_v, known as adiabatic index, and R = Gas constant)

c_p - c_v = R

Both (B) and (C)

[#]

The function of a crosshead is to guide motion of the __________ and to prevent it from bending.

piston rod

connecting rod

eccentric rod

valve rod

[#]

10.

A nozzle is said to be a divergent nozzle

when the cross-section of the nozzle increases continuously from entrance to exit

when the cross-section of the nozzle decreases continuously from entrance to exit

when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit

none of the above

[#]

11.

In a nozzle, the effect of supersaturation is to increase the dryness fraction of steam.

Yes

[#]

12.

A moderator generally used in nuclear power plants is

graphite

heavy water

concrete

graphite and concrete

[#]

13.

The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of

Morse test

prony brake test

motoring test

heat balance test

[#]

14.

The firing order in an I.C. engine depends upon

arrangement of the cylinders

design of crankshaft

number of cylinders

all of these

[#]

15.

A refrigeration system

removes heat from a low temperature body and delivers it to a high temperature body

removes heat from a high temperature body and delivers it to a low temperature body

rejects energy to a low temperature body

none of the above

[#]

16.

The centrifugal compressors are generally used for refrigerants that require

small displacements and low condensing pressures

large displacements and high condensing pressures

small displacements and high condensing pressures

large displacements and low condensing pressures

[#]

17.

A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as hollow saddle key.

Correct

Incorrect

[#]

18.

The metal patterns as compared to wooden patterns require less

shrinkage allowance

machining allowance

draft allowance

distortion allowance

[#]

19.

The efficiency of a screw jack is dependent upon the load raised or lowered.

True

False

[#]

20.

In an open pair, the two elements of a pair

have a surface contact when in motion

have a line or point contact when in motion

are kept in contact by the action of external forces, when in motion

are not held together mechanically

[#]

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Online Mechanical Engineering Test - Mechanical Engineering Test - Random

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