25 JANUARY 2021 CURRENT AFFAIRS QUIZ

For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

Three times

Twice

Equal to

Four times

TRUE ANSWER : ?
YOUR ANSWER : ?

O₂ content in atmospheric air on weight basis is

0.23

0.4

0.3

0.21

TRUE ANSWER : ?
YOUR ANSWER : ?

The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become

Remain dry saturated

Superheated

Wet

Dry

TRUE ANSWER : ?
YOUR ANSWER : ?

The density of supersaturated steam is about __________ that of the ordinary saturated vapor at the corresponding pressure.

4 times

8 times

Same as

2 times

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is not correct statement about effect of sulphur in fuel?

It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

It erodes furnace walls

It helps in electrostatic precipitation of ash in flue gases

It has heating value

TRUE ANSWER : ?
YOUR ANSWER : ?

De-Laval turbines are mostly used

For small power purposes and low speeds

For small power purposes and high speeds

For large power purposes

Where low speeds are required

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal efficiency of a thermal power plant is of the order of

0.15

0.45

0.3

0.2

TRUE ANSWER : ?
YOUR ANSWER : ?

A wet vapor can be completely specified by

Pressure only

Pressure and dryness fraction

Dryness fraction only

Temperature only

TRUE ANSWER : ?
YOUR ANSWER : ?

Caking coals are those which

Show little or no fusing action

Form lumps or masses of coke

Burn completely

Burn freely

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

Vacuum efficiency

Nozzle efficiency

Condenser efficiency

Boiler efficiency

TRUE ANSWER : ?
YOUR ANSWER : ?

↑