What happens to the efficiency when temperature is increased in rankine cycle?

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

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

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

If Tm be the mean temperature of heat addition in Rankine cycle as shown in diagram, what will the formula for efficiency of Rankine cycle?

A

(ηr) = (T3 / Tm)

B

(ηr) = 1 – (T3 / Tm)

C

(ηr) = 1 – (T2 / Tm)

D

(ηr) = (T2 / Tm)

Consider the following statements: 1. The air standard efficiency of an Otto cycle is a function of the properties of the working substance (gas) 2. For the same compression ratio and same input, the thermal efficiency of an Otto cycle is more than that of a Diesel cycle 3. Thermal efficiency of a Diesel cycle increases with decrease of cut-off ratio Which of the above statements are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

Let us say temperature of a body in degree Celsius and degree Rankine are related as TC = 50 + 3TR, what is the change in temperature in Kelvin, if the change in temperature in degree Rankine is 100oR?

A

300 K

B

180 K

C

100 K

The efficiency of Carnot cycle is ____ the efficiency of Rankine cycle.

A

less than

B

greater than

C

equal to

D

none of the mentioned

The efficiency of regenerative cycle will be ____ the efficiency of the Rankine cycle.

A

greater than

B

equal to

C

less than

D

none of the mentioned

Consider the following Statements in respect of regenerative Rankine cycle: 1) Regeneration increases the efficiency of the cycle. 2) The boiler capacity is increased for a given output. 3) The capacity of the condenser is reduced. Which of the above statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion [a]: In a power plant working on a Ranking cycle, the regenerative feed water heating improves the efficiency of the steam turbine. Reason [r]: The regenerative feed water heating raises the average temperature of heat addition in the Rankine cycle.

A

Both [a] and [r] are true and [r] is the correct reason for [a].

B

Both [a] and [r] are true but [r] is NOT the correct reason for [a].

C

Both [a] and [r] are false

D

[a] is false and [r] is true.

What happens to the efficiency when temperature is increased in rankine cycle?

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