Home
Current Affairs January 2024

What is the correct answer?

4

For water, at pressures below atmospheric;

A. Melting point rises slightly and boiling point drops markedly

B. Melting point rises markedly and boiling point drops markedly

C. Melting point drops slightly and boiling point drops markedly

D. Melting point drops slightly and boiling point drops slightly

Correct Answer :

A. Melting point rises slightly and boiling point drops markedly


Related Questions

What is the correct answer?

4

Steam turbines are used for

A. Large marine propulsion

B. Electric power generation

C. Direct drive of fans, compressors, pumps

D. All of these

What is the correct answer?

4

Locomotive boiler is a

A. Single tube, horizontal, internally fired and stationary boiler

B. Single tube, vertical, externally fired and stationary boiler

C. Multi-tubular, horizontal, internally fired and mobile boiler

D. Multi-tubular, horizontal, externally fired and stationary boiler

What is the correct answer?

4

In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

A. 3.3 bar

B. 5.46 bar

C. 8.2 bar

D. 9.9 bar

What is the correct answer?

4

All steam engines work on

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. None of these

What is the correct answer?

4

The crown of the fire box is made hemispherical in order to

A. Give maximum space

B. Give maximum strength

C. Withstand pressure inside boiler

D. Resist intense heat in fire box

What is the correct answer?

4

The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

A. Same

B. Less

C. More

D. None of these

What is the correct answer?

4

The condition of steam in boiler drum is always

A. Dry

B. Wet

C. Saturated

D. Supersaturated

What is the correct answer?

4

Which of the following are boiler accessories?

A. Economiser

B. Superheater

C. Both (A) and (B)

D. None of these

What is the correct answer?

4

The effect of super-saturation is that the

A. Mass of the steam discharged increases

B. Entropy and specific volume of the steam increases

C. Exit velocity of steam reduces

D. All of these

What is the correct answer?

4

In a throttling process

A. Steam temperature remains constant

B. Steam pressure remains constant

C. Steam enthalpy remains constant

D. Steam entropy remains constant

What is the correct answer?

4

The indicated thermal efficiency is defined as the

A. Ratio of thermal efficiency to the Rankine efficiency

B. Ratio of brake power to the indicated power

C. Ratio of heat equivalent to indicated power to the energy supplied in steam

D. Product of thermal efficiency and Rankine efficiency

What is the correct answer?

4

The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become

A. Wet

B. Superheated

C. Remain dry saturated

D. Dry

What is the correct answer?

4

Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

A. Former occupies less space for same power

B. Rate of steam flow is more in former case

C. Former is used for high installed capacity

D. Chances of explosion are less in former case.

What is the correct answer?

4

The natural draught is produced by

A. Steam jet

B. Centrifugal fan

C. Chimney

D. Both (A) and (B)

What is the correct answer?

4

The length of Cornish boiler is of the order of

A. 24 m

B. 35 m

C. 57.5 m

D. 79 m

What is the correct answer?

4

Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

A. And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²

B. And its corresponding conversion into dry steam at desired boiler pressure

C. Conversion into steam at atmospheric condition

D. Conversion into steam at the same pressure at which feed water is supplied

What is the correct answer?

4

When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

A. Internally fired boiler

B. Externally fired boiler

C. Natural circulation boiler

D. Forced circulation boiler

What is the correct answer?

4

The compounding of turbines is done in order to

A. Reduce speed of rotor

B. Improve efficiency

C. Reduce exit losses

D. All of these

What is the correct answer?

4

The radius of a dished head is taken approximately as

A. One fourth

B. Half

C. One

D. Two

What is the correct answer?

4

The clearance in the engine cylinder

A. Increases the mean effective pressure

B. Increases the workdone

C. Decreases the efficiency of the engine

D. All of these

What is the correct answer?

4

When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by

A. (h - hf1)/2257

B. (h + hf1)/2257

C. (h × hf1)/2257

D. None of these

What is the correct answer?

4

The proximate analysis of fuel lists

A. Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

B. Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight

C. Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

D. Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

What is the correct answer?

4

Cochran boiler is a

A. Horizontal fire tube boiler

B. Horizontal water tube boiler

C. Vertical water tube boiler

D. Vertical fire tube boiler

What is the correct answer?

4

In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

A. Water space also

B. Chimney

C. Steam space

D. Superheater

What is the correct answer?

4

The velocity of whirl at outlet for an axial discharge turbine is

A. Minimum

B. Maximum

C. Zero

D. None of these

What is the correct answer?

4

A fusible plug is fitted in small boilers in order to

A. Avoid excessive build up of pressure

B. Avoid explosion

C. Extinguish fire if water level in the boiler falls below alarming limit

D. Control steam dome

What is the correct answer?

4

Parson's reaction turbine is a __________ reaction turbine.

A. 40 percent

B. 50 percent

C. 60 percent

D. 70 percent

What is the correct answer?

4

Lancashire boiler is

A. Stationary fire tube boiler

B. Internally fired boiler

C. Horizontal boiler

D. All of these

What is the correct answer?

4

Vacuum for reciprocating steam engines compared to steam turbines is

A. More

B. Equal

C. Less

D. Could be more or less depending on the size of plant

What is the correct answer?

4

An economiser in a boiler

A. Increases steam pressure

B. Increases steam flow

C. Decreases fuel consumption

D. Decreases steam pressure