3 SEPTEMBER 2021 CURRENT AFFAIRS QUIZ

1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).

10000

10

1000

100

TRUE ANSWER : ?
YOUR ANSWER : ?

Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH)₂ __________ with increasing temperature.

None of these

Decreases

Shows inversion of solubility

Increases

TRUE ANSWER : ?
YOUR ANSWER : ?

Hydrogen in liquid steels is dissolved

In the ionic form

As tiny gas bubbles

In the atomic form

In the molecular form

TRUE ANSWER : ?
YOUR ANSWER : ?

Frost formation on the evaporator tubes in the domestic refrigerators

Can be prevented by proper design

Is immaterial

Causes heat loss due to poor heat transfer

Decreased compressor power

TRUE ANSWER : ?
YOUR ANSWER : ?

Atomic __________ of an element is a whole number.

Weight

Volume

Number

Radius

TRUE ANSWER : ?
YOUR ANSWER : ?

Specific heat of an ideal gas depends upon its

Volume

Molecular weight

Pressure

Temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

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

23/2

23

25/2

21/3

TRUE ANSWER : ?
YOUR ANSWER : ?

Creep consideration is the most important in case of the

Steam engine flywheel

Cast iron pipes

Blades of gas turbines

Cycle chains

TRUE ANSWER : ?
YOUR ANSWER : ?

The best criterion for analysing an economic investment is the

Future value method

Rate of return criterion

Salvage value

Present value method

TRUE ANSWER : ?
YOUR ANSWER : ?

Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

Mortgaging the obsolete machine/property

Disposing off machine/property, which is no longer useful in the present scenerio

Writing off the obsolete machine/ property

Disposing off a machine/property on as is where is basis

TRUE ANSWER : ?
YOUR ANSWER : ?

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