A researcher during an experiment found that mean temperature of heat addition and heat rejection for a steam power plant operating on a Carnot cycle is 127 deg C and 27 deg C respectively. Later, he calculated the thermal efficiency of the steam cycle. Can you predict what was it?

The cycle of evaporation and rain in nature can be assumed to be a kind of Carnot cycle. If ocean water instead of evaporation are boiled by the heat of Sun at a constant temperature of 100 deg C and the condensation of steam into water droplets within the clouds occur at constant temperature of -20 deg C. Find the thermal efficiency of Carnot cycle of nature?

A

0.2777

B

0.3030

C

0.3333

D

0.50

Which of the following statements are correct regarding the Rankine cycle? For a given set of operating pressure limits of a Rankine cycle, superheating the steam beyond the saturation temperature at the boiler pressure will result in: a. an increase in the moisture content of steam leaving the turbine b. an increase in thermal efficiency of the Rankine cycle c. an increase in the mean temperature of heat addition d. a decrease in the amount of heat rejected in the condenser

A

b and c

B

a and d

C

a and b

D

c and d

In a steam turbine power plant, the boiler feedwater temperature is marked as 30 deg C, ocean as sink with temperature 20 deg C and desired thermal efficiency of the plant is 0.46. Find the temperature of steam entering the turbine?

A

500degC

B

505.55degC

C

507.62degC

D

509.18degC

Group I shows different heat addition processes in power cycles. Likewise, Group II shows different heat removal processes. Group III lists power cycles. Match items from Groups I, II and III. Group I Group II Group III P. Pressure constant S. Pressure constant 1. Rankine cycle Q. Volume constant T. Volume constant 2. Otto cycle R. Temperature constant U. Temperature constant 3. Carnot cycle 4. Diesel cycle 5. Brayton cycle

A

P – S – 5, R – U – 3, P – S – 1, Q – T - 2

B

P – S – 1, R – U – 3, P – S – 4, P – T - 2

C

R – T – 3, P – S – 1, P – T – 4, Q – S - 5

D

P – T – 4, R – S – 3, P – S – 1, P – S - 5

In a newly developed innovative idea brought up by CSIR in India, gas turbine exhaust gas are being utilized to convert feedwater into steam. Certain data of the experiment are as follows: mass flow rate of exhaust gas = 40 kg/hr, enthalpy of exhaust gas at the time of their exit from gas turbine is 600 kJ/kg, steam turbine output as measured by brake dynamometer = 60 hp-sec, thermal efficiency of steam power plant is 0.25, efficiency of exhaust gas in converting feedwater into steam is taken as 50%. Find the enthalpy of exhaust gas remaining after they generate steam from feedwater?

A

350.0KJ/Kg

B

241.2KJ/Kg

C

112.45KJ/Kg

D

512.56KJ/Kg

Mr.Rohan while helping the students of Class IV in adding and subtracting fractions observed that several students are not able to complete the addition of two improper fractions. He gave a small test with questions from the addition of proper fractions (one item of addition of two similar fractions, three items from the addition of proper and improper fractions, and four items from the addition of improper fractions). He analyzed the responses of each student and found that nearly 45% of students were not clear in adding proper with improper fractions which were affecting their performance in adding two improper fractions. He, therefore, focused on developing the understanding of improper fractions and their addition with proper fractions after which he proceeded to teach the addition of two improper fractions. Which kind of assessment is depicted by this situation?

A

Assessment OF Learning

B

Assessment for Learning

C

Assessment AS Learning

D

Assessment by learning

Which combination of the following statements is correct? The incorporation of reheater in a steam power plant: P: always increases the thermal efficiency of the plant. Q: always increases the dryness fraction of steam at condenser inlet. R: always increases the mean temperature of heat addition. S: always increases the specific work output.

A

P and S

B

Q and S

C

P, R and S

D

P, Q, R and S

Match List-I with List-II and select the correct answer using the code given below the Lists: List I (Low-Latitude Climate) List I (Characteristic) A. Wet Equatorial 1. Uniform temperatures, mean near 27°C B. Monsoon and trade wind coastal 2. Marked temperature cycle with very high temperature before the rainy season C. Wet-dry tropical 3. Temperatures show an annual cycle with a high temperature in the high-Sun season Strong temperature cycle. with intense temperature during the high-Sun season D. Dry tropical 4. Strong temperature cycle, with intense temperature during the high-Sun season

A

A - 2, B - 3, C- 4, D - 1

B

A - 1, B - 2, C - 3, D - 4

C

A - 2, B - 4, C - 3, D - 1

D

A -1, B - 3, C - 2, D - 4

In a solar operated steam power plant, water is converted into steam via solar heat. If the effective area of solar plate is 200m2, value of solar constant is 1.362KW per m2, efficiency of solar components is 17% and overall thermal efficiency of steam cycle desired is 12%. Find the turbine power output?

A

45KW

B

22.46KW

C

5.55KW

D

16.54KW

If Carnot cycle has maximum possible thermal efficiency, then why don’t the steam turbine power plants run on Carnot cycle?

A

Because boiler can’t be maintained at constant pressure in Carnot cycle

B

Since work consumed by compressor is approximately equal to work produced by turbine

C

As mean temperature of heat addition is quite low in case of Carnot cycle

D

Because the process of heat addition is at constant temperature

A researcher during an experiment found that mean temperature of heat addition and heat rejection for a steam power plant operating on a Carnot cycle is 127 deg C and 27 deg C respectively. Later, he calculated the thermal efficiency of the steam cycle. Can you predict what was it?

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