THEORY OF MACHINE QUIZ

If the head is doubled in & centrifugal pump, the power required will increase in the ratio of

25/2

21/3

23/2

23

TRUE ANSWER : ?
YOUR ANSWER : ?

Powder metallurgy process does not make metal powder by

Hammering

Grinding/milling

Electrolytic deposition

Atomisation

TRUE ANSWER : ?
YOUR ANSWER : ?

Compression ratio of an I.C. engine is the ratio of the

None of these

Clearance volume to the volume swept by piston per stroke

Pressure after compression to that before compression

Volume of air in cylinder before compression to that after compression

TRUE ANSWER : ?
YOUR ANSWER : ?

Steel produced from phosphatic iron is __________ in nature.

Tough

Brittle

Malleable

Ductile

TRUE ANSWER : ?
YOUR ANSWER : ?

The best criterion for analysing an economic investment is the

Rate of return criterion

Future value method

Present value method

Salvage value

TRUE ANSWER : ?
YOUR ANSWER : ?

Factor of safety is the ratio of the __________ stress to the working stress.

Compressive

Bearing

Yield

Tensile

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is an example of cathodic protection of metals against corrosion ?

Painted steel

Case hardened steel

Lead lined reactor

Galvanised iron

TRUE ANSWER : ?
YOUR ANSWER : ?

Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience.

Elastic limit

Proportional limit

Maximum point

Yield strength

TRUE ANSWER : ?
YOUR ANSWER : ?

Tempering of a material does not improve its

Toughness

Machinability

Softness

Internal stress level

TRUE ANSWER : ?
YOUR ANSWER : ?

Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

Re0.8, Re0.5

Re0.8, Re-0.5

Re0.5, Re0.8

Re-0.8, Re0.5

TRUE ANSWER : ?
YOUR ANSWER : ?