Deck 8: Mechanical Engineering : Punching Vs Drilling, Casting Sands, Leaf Springs

Question 1

Among punching and drilling, punching is safer.

Answer 1

False

Question 2

What is the amount of sea coal needed in cast irons for small casting moulding sands?

A)1%
B)2%
C)3%
D)4%

Answer 2

1%

Question 3

The longest leaf in a leaf spring is called centre leaf.

A)it is called middle leaf
B)it is called master leaf
C)yes
D)none of the listed

Answer 3

it is called master leaf

Question 4

If the spring is compressed completely and the adjacent coils touch each other,the the length of spring is called as?

A)solid length
B)compressed length
C)free length
D)none of the mentioned

Question 5

If uncompressed length of spring is 40mm and number of coils 10mm, then pitch of coil is?

A)4
B)40/9
C)40/11
D)none of the mentioned

Question 6

Active and inactive, both types of coils support the load although both don't participate in spring action.

A)active coils don't support the load
B)inactive coils don't support the load
C)both active and inactive don't support the load
D)both active and inactive support the load

Question 7

The coefficient of fluctuation of speed is the_______ of maximum fluctuation of speed and the mean speed.

A)product
B)ratio
C)sum
D)difference

Question 8

If E = Mean kinetic energy of the flywheel, CS = Coefficient of fluctuation of speed and ? E = Maximum fluctuation of energy, then

A)?e = e / cs
B)?e = e² × cs
C)topic 4.2 flywheels considering stresses in rims and arms for engines and punching machines

Question 9

The tensile stress in the flywheel rim due to the centrifugal force acting on the rim is given by

A)? v²/4
B)? v²/2
C)3? v²/4
D)? v²

Question 10

In a four stroke cycle engine camshaft revolves at_______the crank speed.

A)two times
B)half
C)four times
D)three times

Question 11

Crankshafts are usually constructed by

A)casting
B)drop forging
C)drawing
D)extrusion

Question 12

A_______bearing supports the load acting along the axis of the shaft.

A)thrust
B)radial
C)longitudinal
D)transversal

Question 13

In steam and gas turbines, rolling contact bearings are used.

Question 14

Deep groove ball bearings creates a lot of noise.

A)yes
B)they create very less noise
C)depends on the application
D)no reference frame for comparison is mentioned

Question 15

In angular contact bearings,_______  bearings are required to take thrust load in both directions.

A)1
B)4
C)2
D)3

Question 16

Which of the following isn't the property of taper roller?

A)high rigidity
B)easy dismantling
C)take low radial and heavy loads
D)all are the properties of tapper roller

Question 17

Which of the following cannot take radial load?

A)cylindrical roller bearing
B)taper roller bearing
C)thrust ball bearing
D)none of the listed

Question 18

There are_______  common types of bevel gears.

A)1
B)2
C)3
D)4

Question 19

Miter gears are the bevel gears mounted on shaft which are intersecting at angle greater than 90.

Question 20

In hypoid bevel gears, shafts may continue past each other.

Question 21

Hypoid gears have the following characteristics.

A)curved teeth
B)mounted on non -parallel non intersecting shafts
C)efficiency of 97%
D)all of the mentioned

Question 22

The bearing characteristic number shown in the graph is directly proportional to the unit bearing pressure.

Question 23

A single transverse weld is preferred over double transverse fillet weld.