Online Mechanical Engineering Test - Mechanical Engineering Test - Random

Instruction:

This is a FREE online test. Beware of scammers who ask for money to attend this test.
Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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All the best!

Moment of inertia of a circular section about its diameter (d) is

πd³/16

πd³/32

πd⁴/32

πd⁴/64

[#]

According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)

Cd(L - nH)2gH

Cd(L - 0.1nH)2gH^3/2

Cd(L - nH)2gH²

Cd(L - 0.2nH)2gH^5/2

[#]

An impulse turbine is used for

low head of water

high head of water

medium head of water

high discharge

[#]

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

combustion is at constant volume

expansion and compression are isentropic

maximum temperature is higher

heat rejection is lower

[#]

The elements are made up of minute and chemically invisible particles as atoms.

True

False

[#]

The critical pressure ratio for initially wet steam is

0.546

0.577

0.582

0.601

[#]

A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities C_max and C_min. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

AU C_min

[#]

A thermostatic expansion valve in a refrigeration system

ensures the evaporator completely filled with refrigerant of the load

is suitable only for constant load systems

maintains different temperatures in evaporator in proportion to load

none of the above

[#]

A column is known as a long column if the slenderness ratio is

100

[#]

10.

The stress in the threaded part of the bolt will be __________ as compared to the shank.

same

higher

lower

[#]

11.

The yield point in static loading is __________ as compared to fatigue loading.

higher

lower

same

[#]

12.

When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

[#]

13.

The cutting speed for drilling aluminium, brass and bronze with high speed steel drills varies from

10 to 20 m/min

18 to 30 m/min

24 to 45 m/min

60 to 90 m/min

[#]

14.

The enlarging of an existing circular hole with a rotating single point tool is called

boring

drilling

reaming

internal turning

[#]

15.

Which of the following type of layout is suitable for automobile manufacturing concern?

product layout

process layout

fixed position layout

combination layout

[#]

16.

Travel charts are used to

analyse material handling

determine inventory control difficulties

plan material handling procedure and routes

all of the above

[#]

17.

When the body is suspended at the point of suspension, its periodic time and frequency will be __________ as compared to the body suspended at the point of percussion.

same

two times

four times

[#]

18.

Frequency of vibrations is usually expressed in

number of cycles per hour

number of cycles per minute

number of cycles per second

none of these

[#]

19.

Which of the following statement is correct for involute gears?

The interference is inherently absent.

The variation in centre distance of shafts increases radial force.

A convex flank is always in contact with concave flank.

The pressure angle is constant throughout the teeth engagement.

[#]

20.

The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)