Online Mechanical Engineering Test - Machine Design Test 1

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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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The application of third type levers is found in

handle of a hand pump

hand wheel of a punching press

lever of a loaded safety valve

a pair of tongs

[#]

Which of the following statement is correct for gears?

The addendum is less than dedendum

The pitch circle diameter is equal to the product of module and number of teeth

The pitch circle is always greater than the base circle

all of the above

[#]

The surface finish factor for a mirror polished material is

0.45

0.65

0.85

[#]

18/8 steel contains

18% nickel and 8% chromium

18% chromium and 8% nickel

18% nickel and 8% vanadium

18% vanadium and 8% nickel

[#]

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

higher

lower

same

[#]

A single strap butt joint is always in __________ shear.

single

double

[#]

A machine part subjected to __________ is called a strut.

an axial tensile force

an axial compressive force

a tangential force

any one of these

[#]

A shoe brake is commonly used in railway trains.

Yes

[#]

The minor diameter of a screw thread is also known as outside or nominal diameter.

Correct

Incorrect

[#]

10.

The effective stress in wire ropes during normal working is equal to the stress due to

axial load plus stress due to bending

acceleration/retardation of masses plus stress due to bending

axial load plus stress due to acceleration/retardation

bending plus stress due to acceleration/retardation

[#]

11.

The velocity factor for ordinary cut gears operating at velocities upto 12.5 m/s is equal to

[#]

12.

A basic shaft is one whose

lower deviation is zero

upper deviation is zero

lower and upper deviations are zero

none of these

[#]

13.

In a sawn nut, a slot is cut about half way through the nut and a small screw is tightened between the nut and the bolt in order to produce more friction.

Agree

Disagree

[#]

14.

When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

axially upwards

axially downwards

axially upwards or downwards

none of these

[#]

15.

Creep in belt is due to

material of the belt

material of the pulley

uneven extensions and contractions due to varying tension

all of the above

[#]

16.

A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ . The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ/2

2 τ

4 τ

[#]

17.

Deep groove ball bearings are used for

heavy thrust load only

small angular displacement of shafts

radial load at high speed

combined thrust and radial loads at high speed

[#]

18.

A cotter joint is used to connect two __________ rods.

co-axial

perpendicular

parallel

[#]

19.

Teflon is used for bearings because of

low coefficient of friction

better heat dissipation

smaller space consideration

all of these

[#]

20.

A steel containing upto 0.15% carbon is known as

mild steel

dead mild steel

medium carbon steel

high carbon steel

[#]

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Online Mechanical Engineering Test - Machine Design Test 1

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