8/17/23, 11:53 AM
Power Plant Engineering - - Unit 3 - Week 1
X
(https://swayam.gov.in)
(https://swayam.gov.in/nc_details/NPTEL)
mmkssmiet@gmail.com 
NPTEL (https://swayam.gov.in/explorer?ncCode=NPTEL) » Power Plant Engineering (course)

Click to register
for Certification
exam
Week 1: Assignment 1
(https://examform.nptel.ac.in/2023_10/exam_form/dashboard)
The due date for submitting this assignment has passed.
Due on 2023-08-09, 23:59 IST.
If already
registered, click
to check your
payment status
Assignment submitted on 2023-08-03, 10:48 IST
1) Consider a simple heat engine with a piston-cylinder arrangement having gas inside
1 point
the cylinder and a weight of 10 kg resting on top of the piston. A heat of 100 kJ is supplied to the gas
initially at 30°C. The gas temperature increases, and it expands with the heat supplied, which lifts
Course
outline
How does an
NPTEL online
course work?
()
Week 0 ()
the weight. The work done on the weight can be estimated as
50 kJ
100 kJ
Less than 100 kJ
Greater than 100 kJ
Yes, the answer is correct.
Score: 1
Accepted Answers:
Less than 100 kJ
Week 1 ()
Energy
Scenario and
Basic Concepts
(unit?
unit=17&lesson
=18)
2) During a cyclic process, a net heat transfer of 75 kJ is recorded while initial and final
1 point
state internal energy values were 10 kJ and 40 kJ, respectively. The work done during this cyclic
process, if no heat is lost elsewhere, should be equal to
50 kJ
75 kJ
85 kJ
Steam Power
Plant Cycle
115 kJ
N
h
i i
https://onlinecourses.nptel.ac.in/noc23_me133/unit?unit=17&assessment=104
1/4
8/17/23, 11:53 AM
(unit?
unit=17&lesson
=19)
Fossil Fuel
Steam
Generator-I
(unit?
unit=17&lesson
=20)
Fossil Fuel
Steam
Generator-II
(unit?
unit=17&lesson
=21)
Mountings and
Accessories-I
(unit?
unit=17&lesson
=22)
Quiz: Week 1:
Assignment 1
(assessment?
name=104)
Week 1:
Assignment 1
Solutions (unit?
unit=17&lesson
=113)
Week 2 ()
Power Plant Engineering - - Unit 3 - Week 1
No, the answer is incorrect.
Score: 0
Accepted Answers:
75 kJ
3) The efficiency of the Rankine cycle is often improved by an increase in the boiler
1 point
pressure. Select the correct statement regarding the effects of the increase in boiler pressure on the
Rankine cycle.
Mean temperature of heat addition increases, cycle efficiency increases, and vapor quality at
the turbine exit decreases.
Mean temperature of heat addition increases, cycle efficiency decreases, and vapor quality
at the turbine exit decreases.
Mean temperature of heat addition decreases, cycle efficiency increases, and vapor quality
at the turbine exit increases.
Mean temperature of heat addition decreases, cycle efficiency decreases, and vapor quality
at the turbine exit decreases.
Yes, the answer is correct.
Score: 1
Accepted Answers:
Mean temperature of heat addition increases, cycle efficiency increases, and vapor quality at the
turbine exit decreases.
4) A steam power plant working on a simple Rankine cycle has a thermal efficiency of
1 point
26%. The work done by the turbine was estimated to be 745 kJ/kg when the heat input in the boiler
was recorded as 2800 kJ/kg. For the given power plant, what is the work that is consumed by the
pump?
15 kJ/kg
16 kJ/kg
17 kJ/kg
18 kJ/kg
Week 3 ()
Week 4 ()
DOWNLOAD
VIDEOS ()
WEEKLY
FEEDBACK ()
Text
Transcripts ()
Books ()
Yes, the answer is correct.
Score: 1
Accepted Answers:
17 kJ/kg
5) Which among the following is an example of a water-tube boiler?
1 point
Lancashire boiler
Cornish boiler
Cochran Boiler
Babcock and Wilcox boiler
Yes, the answer is correct.
Score: 1
Accepted Answers:
Babcock and Wilcox boiler
https://onlinecourses.nptel.ac.in/noc23_me133/unit?unit=17&assessment=104
2/4
8/17/23, 11:53 AM
Power Plant Engineering - - Unit 3 - Week 1
6) In fire-tube boilers, hot gases flow inside the tubes, and the water surrounds the tubes 1 point
to get heat and gets converted to steam. Generally, these types of boilers are
High-pressure boilers and suitable for large power plants.
Low-pressure boilers and not suitable for large power plants.
Low-pressure boilers and suitable for large power plants.
High-pressure boilers and not suitable for large power plants.
No, the answer is incorrect.
Score: 0
Accepted Answers:
Low-pressure boilers and not suitable for large power plants.
7) Which type of high-pressure boiler is also classified as a once-through boiler and
1 point
doesn’t have a drum to collect the steam?
Lancashire boiler
Benson boiler
La Mont boiler
Velox boiler
Yes, the answer is correct.
Score: 1
Accepted Answers:
Benson boiler
8) Generally, small-diameter tubes are used in high-pressure boilers, even though more 1 point
pumping power is required because of their small diameters. The important reason behind it is
Smaller surface-to-volume ratio of tubes provides large areas for heat transfer.
Smaller surface-to-volume ratio of tubes provides small areas for heat transfer.
Large surface-to-volume ratio of tubes provides large areas for heat transfer.
Large surface-to-volume ratio of tubes provides small areas for heat transfer.
Yes, the answer is correct.
Score: 1
Accepted Answers:
Large surface-to-volume ratio of tubes provides large areas for heat transfer.
9) A pressure gauge is fitted on a boiler to measure the pressure of steam coming out of 1 point
the boiler. The pressure gauge records a pressure of 100 bar while the atmospheric pressure is 100
kPa. What will be the absolute pressure of the steam?
99 bars
100 bars
101 bars
200 bars
Yes, the answer is correct.
S
1
https://onlinecourses.nptel.ac.in/noc23_me133/unit?unit=17&assessment=104
3/4
8/17/23, 11:53 AM
Power Plant Engineering - - Unit 3 - Week 1
Score: 1
Accepted Answers:
101 bars
10) A boiler mounting that prevents the back flow of water from boiler to pump in case of
pressure differences between pump and boiler or pump stoppage is called
1 point
Feed check valve
Steam stop valve
Safety valve
High steam and low water supply valve
Yes, the answer is correct.
Score: 1
Accepted Answers:
Feed check valve
https://onlinecourses.nptel.ac.in/noc23_me133/unit?unit=17&assessment=104
4/4