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Test: Power Plant Level - 1

25 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Test: Power Plant Level - 1

Description

Attempt Test: Power Plant Level - 1 | 25 questions in 50 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Mechanical Engineering SSC JE (Technical) for Mechanical Engineering Exam | Download free PDF with solutions

QUESTION: 1

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
E.
none of the above

Solution:

QUESTION: 2

The saturation temperature of steam with increase in pressure increases

A.
linearly
B.
rapidly first and then slowly
C.
slowly first and then rapidly
D.
inversely
E.
none of the above

Solution:

QUESTION: 3

Carbonisation of coal is the process of

A.
pulverising coal in inert atmosphere
B.
heating wood in a limited supply of air at temperatures below 300ºC
C.
strongly heating coal continuously or about 48 hours in the absence of air in a closed vessel
D.
binding the pulverised coal into bricketters
E.
enriching carbon in the coal

Solution:

QUESTION: 4

Coke is produced by

A.
pulverising coal in inert atmosphere
B.
heating wood in a limited supply of air at temperatures below 300ºC
C.
strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
D.
binding the pulverised coal into bricketts
E.
enriching carbon in the coal.

Solution:

Coke. It is produced when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel. This process is known as carbonisation of coal. Coke is dull black in colour, porous and smokeless. It has a high carbon content (85 to 90%) and has a higher calorific value than coal.

QUESTION: 5

Heating of dry stream above saturation temperature is known as

A.
enthalpy
B.
superheating
C.
supersaturation
D.
latent heat
E.
super tempering

Solution:

QUESTION: 6

Superheating of steam is done at

A.
constant volume
B.
constant temperature
C.
constant pressure
D.
constant entropy
E.
constant enthalpy

Solution:

QUESTION: 7

1 kg.m is equal to

A.
9.81 Joules
B.
421 Joules
C.
427 Joules
D.
102 Joules
E.
539 Joules.

Solution:

QUESTION: 8

Sublimation region is the region where

A.
solid and vapour phases are in equilibrium
B.
solid and liquid phases are in equilibrium
C.
liquid and vapour phases are in equilibrium
D.
solid, liquid and vapour phases are in equilibrium
E.
none of the above

Solution:

QUESTION: 9

Stoichiometric quantity of air is the

A.
air present in atmosphere at NTP conditions
B.
air required for complete combustion of fuel with no excess air
C.
air required for optimum combustion so as to have reasonable excess air
D.
air required to convert CO into CO₂
E.
air required to form an explosive mixture

Solution:

QUESTION: 10

One kg of steam sample contains 0.8 kg dry steam; it's dryness fraction is

A.
0.2
B.
0.8
C.
1.0
D.
0.6
E.
0.5

Solution:

QUESTION: 11

The specific heat of superheated steam in kcal/ kg is generally of the order of

A.
0.1
B.
0.3
C.
0.5
D.
0.8
E.
1.0

Solution:

QUESTION: 12

On Mollier chart, flow through turbine is represented by

A.
horizontal straight line
B.
vertical straight line
C.
straight inclined line
D.
curved line
E.
none of the above

Solution:

QUESTION: 13

The bituminous coal is non-caking if its carbon content is

A.
78 – 81%
B.
81 – 85%
C.
85 – 90%
D.
90 – 95%
E.
95 – 100%

Solution:

QUESTION: 14

In a throttling process

A.
steam temperature remains constant
B.
steam pressure remains constant
C.
steam enthalpy remains constant
D.
steam entropy remains constant
E.
steam volume remains constant

Solution:

QUESTION: 15

In a throttling process

A.
heat transfer takes place
B.
work is done by the expanding steam
C.
internal energy of steam changes
D.
all of the above
E.
none of the above

Solution:

QUESTION: 16

Adiabatic process is

A.
essentially an isentropic process
B.
non-heat transfer process
C.
reversible process
D.
constant temperature process
E.
None of the above

Solution:

QUESTION: 17

Hygrometry deals with the

A.
Hygroscopic substances
B.
water vapour in air
C.
temperature of air
D.
pressure of air
E.
density measurement

Solution:

QUESTION: 18

Orsat meter is used for

A.
gravimetric analysis of the flue gases
B.
volumetric analysis of the flue gases
C.
mass flow of the flue gases
D.
measuring smoke density of flue gases
E.
none of the above

Solution:

QUESTION: 19

Alkaline pyrogallate is used in Orsat's apparatus or absorption of

A.
CO₂
B.
CO
C.
O₂
D.
N₂
E.
None of these

Solution:

QUESTION: 20

An ideal regenerative cycle is

A.
equal to carnot cycle
B.
less than carnot cycle
C.
more than carnot cycle
D.
could be anything
E.
none of the above

Solution:

QUESTION: 21

Efficiency of ranking cycle can be increased by

A.
increasing initial steam pressure and temperature
B.
increasing exhaust pressure
C.
decreasing exhaust pressure
D.
increasing the expansion ratio
E.
increasing number of regenerative heaters

Solution:

Increasing the operating pressure of the boiler, automatically raises the temperature at which boiling takes place. This raises the average temperature at which heat is added to the steam and thus raises the thermal efficiency of the cycle.

QUESTION: 22

The following boiler makes use of pressurized combustion