The expression for the overall temperature difference TOA is given by?

tOA = boiler saturation temperature + condenser temperature

tOA = boiler saturation temperature – condenser temperature

tOA = boiler saturation temperature + condenser temperature

tOA = boiler saturation temperature x condenser temperature

tOA = boiler saturation temperature / condenser temperature

What is the expression for enthalpy of each heater hper heater if a represents the enthalpy of heated feedwater from the economiser and b represents the enthalpy at condenser & n represents the number of heaters?

/ (n + 1)b) hper heater = (a-b) x (n – 1)

hper heater = (a-b)/ (n + 1)b) hper heater = (a-b) x (n – 1)c) hper heater = (a-b) + (n – 1)d) hper heater = (a-

/ (n + 1)b) hper heater = (a-b) x (n – 1)

hper heater = (a-b) + (n – 1)

hper heater = (a-b) – (n + 1)

The expression for temperature rise t in feedwater heater when a & b are the temperatures of boiler saturation & condenser respectively, is given by which of the following expression?

t = 0.5 (a x b)b) t = 0.5 (a / b)c) t = 0.5 (a + b)d) t = 0.5 (a –

THE_EXPRESSION_FOR_THE_OVERALL_TEMPERATURE_DIFFERENCE_T_IS_GIVEN_BY??$

t = boiler saturation temperature + condenser temperature

t = boiler saturation temperature ‚Äö√Ñ√∂‚àö√ë‚àö¬® condenser temperature

t = boiler saturation temperature + condenser temperature

t = boiler saturation temperature x condenser temperature

t = boiler saturation temperature / condenser temperature

The expression for efficiency gain due to regeneration if a, b, n correspond to alpha, beta, cycle efficiency respectively, is?

n = ((a x a x b)/((a ‚Äö√Ñ√∂‚àö√ë‚àö¬® b)(a + 2b)2))

n = ((a x a x b)/((a + b)((a + 2b)2))

n = ((a x a x b)/((a ‚Äö√Ñ√∂‚àö√ë‚àö¬® b)(a + 2b)2))

n = ((a x a x b)/((a + b)(a + b)2))

n = ((a x a x b)/((a + b)(a + 2b)3))

The expression for efficiency when a & b are two constants corresponding to alpha & beta and c corresponds to gamma, is?

Efficiency = 1 + ((b2))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))

Efficiency = 1 ‚Äö√Ñ√∂‚àö√ë‚àö¬® ((b2))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))

Efficiency = 1 + ((b2))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))

Efficiency = ((b2))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))

Efficiency = 1 / ((b2))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))

The effect on the degree of regeneration due to an increase in feedwater temperature is?

degree of regeneration increases

degree of regeneration decreases

degree of regeneration remain same

degree of regeneration is optimised

If n denotes the number of heater, t denotes the overall temperature difference & T denotes the total temperature rise of feedwater. The expression for T is?

( n/(n+1)) ‚Äö√Ñ√∂‚àö√ë‚àö¬® t

What is the expression for enthalpy of each heater h heater if a represents the enthalpy of heated feedwater from the economiser and b represents the enthalpy at condenser & n represents the number of heaters?

h heater = ( a-b ) ‚Äö√Ñ√∂‚àö√ë‚àö¬® (n +1)

The feedwater in the Economiser _________

is cooled by outgoing flue gases

is heated by bled turbine steam

is cooled by bled turbine steam

is heated by outgoing flue gases

is cooled by outgoing flue gases

The economiser can also be assumed as?

Economiser has nothing to do with Feedwater

What happens to the feedwater that enters the economiser?

Feedwater is heated to the boiler temperature at the saturation pressure

Feedwater is heated to the saturation temperature at the boiler pressure

Feedwater is heated to the boiler temperature at the saturation pressure

Feedwater is cooled to the saturation temperature

Feedwater is cooled at the boiler pressure

The expression for temperature rise t in feedwater heater when a & b are the temperatures of boiler saturation & condenser resprctively, is given by which of the following expression?

t = 0.5 (a ‚Äö√Ñ√∂‚àö√ë‚àö¬® b)

What is the value of ‚Äö√Ñ√∂‚àö√ë‚àö‚à´beta‚Äö√Ñ√∂‚àö√ë‚àöœÄ if h represents the local enthalpy on the given expansion line at a given pressure & hf is the enthalpy of saturated water at that pressure?

h ‚Äö√Ñ√∂‚àö√ë‚àö¬® hf

22 + Mcqs in Optimum Degree Regeneration in Power Plant Page 1 McqOptions

1.	The number of heaters for a plant is fixed by?
A.	Mass Balance
B.	Energy balance
C.	Heat balance
D.	None of the mentioned
Answer» C. Heat balance

Discussion

2.	Efficiency gain follow the law of ____________
A.	diminishing forward motion
B.	increasing return
C.	decreasing return
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

3.	The expression for the overall temperature difference TOA is given by?
A.	tOA = boiler saturation temperature – condenser temperature
B.	tOA = boiler saturation temperature + condenser temperature
C.	tOA = boiler saturation temperature x condenser temperature
D.	tOA = boiler saturation temperature / condenser temperature
Answer» B. tOA = boiler saturation temperature + condenser temperature

Discussion

4.	If n denotes the number of heater, tOA denotes the overall temperature difference & Tfw denotes the total temperature rise of feedwater. The expression for Tfw is?
A.	(n/(n+1)) x tOA
B.	(n/(n-1)) x tOA
C.	(n/(n+1)) / tOA
D.	(n/(n+1)) – tOA
Answer» B. (n/(n-1)) x tOA

Discussion

5.	What is the expression for enthalpy of each heater hper heater if a represents the enthalpy of heated feedwater from the economiser and b represents the enthalpy at condenser & n represents the number of heaters?
A.	hper heater = (a-b)/ (n + 1)b) hper heater = (a-b) x (n – 1)c) hper heater = (a-b) + (n – 1)d) hper heater = (a-
B.	/ (n + 1)b) hper heater = (a-b) x (n – 1)
C.	hper heater = (a-b) + (n – 1)
D.	hper heater = (a-b) – (n + 1)
Answer» B. / (n + 1)b) hper heater = (a-b) x (n – 1)

Discussion

6.	The expression for temperature rise t in feedwater heater when a & b are the temperatures of boiler saturation & condenser respectively, is given by which of the following expression?
A.	t = 0.5 (a x b)b) t = 0.5 (a / b)c) t = 0.5 (a + b)d) t = 0.5 (a –
B.	t = 0.5 (a / b)
C.	t = 0.5 (a + b)
D.	t = 0.5 (a – b)
Answer» E.

Discussion

7.	What is the value of “beta” if h represents the local enthalpy on the given expansion line at a given pressure & hf is the enthalpy of saturated water at that pressure?
A.	h + hf
B.	h x hf
C.	h – hf
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

8.	THE_EXPRESSION_FOR_THE_OVERALL_TEMPERATURE_DIFFERENCE_T_IS_GIVEN_BY??$
A.	t = boiler saturation temperature ‚Äö√Ñ√∂‚àö√ë‚àö¬® condenser temperature
B.	t = boiler saturation temperature + condenser temperature
C.	t = boiler saturation temperature x condenser temperature
D.	t = boiler saturation temperature / condenser temperature
Answer» B. t = boiler saturation temperature + condenser temperature

Discussion

9.	The number of heaters for a plant is fixed by?$
A.	Mass Balance
B.	Energy balance
C.	Heat balance
D.	None of the mentioned.
Answer» C. Heat balance

Discussion

10.	Efficiency gain follows the law of?$
A.	diminishing forward motion
B.	increasing return
C.	decreasing return
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

11.	The expression for efficiency gain due to regeneration if a, b, n correspond to alpha, beta, cycle efficiency respectively, is?
A.	n = ((a x a x b)/((a + b)((a + 2b)<sup>2</sup>))
B.	n = ((a x a x b)/((a ‚Äö√Ñ√∂‚àö√ë‚àö¬® b)(a + 2b)<sup>2</sup>))
C.	n = ((a x a x b)/((a + b)(a + b)<sup>2</sup>))
D.	n = ((a x a x b)/((a + b)(a + 2b)<sup>3</sup>))
Answer» B. n = ((a x a x b)/((a ‚Äö√Ñ√∂‚àö√ë‚àö¬® b)(a + 2b)<sup>2</sup>))

Discussion

12.	What is the relation between a & c if a & c correspond to alpha & gamma respectively, for maximum efficiency of a cycle?
A.	a = 3c
B.	c = 2a
C.	c = (a/3)
D.	a = 2c
Answer» E.

Discussion

13.	The expression for efficiency when a & b are two constants corresponding to alpha & beta and c corresponds to gamma, is?
A.	Efficiency = 1 ‚Äö√Ñ√∂‚àö√ë‚àö¬® ((b<sup>2</sup>))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))
B.	Efficiency = 1 + ((b<sup>2</sup>))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))
C.	Efficiency = ((b<sup>2</sup>))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))
D.	Efficiency = 1 / ((b<sup>2</sup>))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))
Answer» B. Efficiency = 1 + ((b<sup>2</sup>))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c)))

Discussion

14.	The effect on the degree of regeneration due to an increase in feedwater temperature is?
A.	degree of regeneration increases
B.	degree of regeneration decreases
C.	degree of regeneration remain same
D.	degree of regeneration is optimised
Answer» E.

Discussion

15.	If n denotes the number of heater, t denotes the overall temperature difference & T denotes the total temperature rise of feedwater. The expression for T is?
A.	( n/(n+1)) x t
B.	( n/(n-1)) x t
C.	( n/(n+1)) / t
D.	( n/(n+1)) ‚Äö√Ñ√∂‚àö√ë‚àö¬® t
Answer» B. ( n/(n-1)) x t

Discussion

16.	What is the expression for enthalpy of each heater h heater if a represents the enthalpy of heated feedwater from the economiser and b represents the enthalpy at condenser & n represents the number of heaters?
A.	h heater = ( a-b )/ (n +1)
B.	h heater = ( a-b ) x (n -1)
C.	h heater = ( a-b ) + (n -1)
D.	h heater = ( a-b ) ‚Äö√Ñ√∂‚àö√ë‚àö¬® (n +1)
Answer» B. h heater = ( a-b ) x (n -1)

Discussion

17.	The temperature rise from condenser to boiler saturation is divided __________ among the feedwater heaters for maximum gain in efficiency.
A.	unequally
B.	partially
C.	equally
D.	remains undivided
Answer» D. remains undivided

Discussion

18.	The feedwater in the Economiser _________
A.	is heated by bled turbine steam
B.	is cooled by bled turbine steam
C.	is heated by outgoing flue gases
D.	is cooled by outgoing flue gases
Answer» D. is cooled by outgoing flue gases

Discussion

19.	The economiser can also be assumed as?
A.	Feedwater cooler
B.	Feedwater heater
C.	Economiser has nothing to do with Feedwater
D.	None of the mentioned
Answer» C. Economiser has nothing to do with Feedwater

Discussion

20.	What happens to the feedwater that enters the economiser?
A.	Feedwater is heated to the saturation temperature at the boiler pressure
B.	Feedwater is heated to the boiler temperature at the saturation pressure
C.	Feedwater is cooled to the saturation temperature
D.	Feedwater is cooled at the boiler pressure
Answer» B. Feedwater is heated to the boiler temperature at the saturation pressure

Discussion

21.	The expression for temperature rise t in feedwater heater when a & b are the temperatures of boiler saturation & condenser resprctively, is given by which of the following expression?
A.	t = 0.5 (a x b)
B.	t = 0.5 (a / b)
C.	t = 0.5 (a + b)
D.	t = 0.5 (a ‚Äö√Ñ√∂‚àö√ë‚àö¬® b)
Answer» E.

Discussion

22.	What is the value of ‚Äö√Ñ√∂‚àö√ë‚àö‚à´beta‚Äö√Ñ√∂‚àö√ë‚àöœÄ if h represents the local enthalpy on the given expansion line at a given pressure & hf is the enthalpy of saturated water at that pressure?
A.	h + hf
B.	h x hf
C.	h ‚Äö√Ñ√∂‚àö√ë‚àö¬® hf
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

Explore topic-wise MCQs in Power Plant.

The number of heaters for a plant is fixed by?

Efficiency gain follow the law of ____________

The expression for the overall temperature difference TOA is given by?

If n denotes the number of heater, tOA denotes the overall temperature difference & Tfw denotes the total temperature rise of feedwater. The expression for Tfw is?

What is the expression for enthalpy of each heater hper heater if a represents the enthalpy of heated feedwater from the economiser and b represents the enthalpy at condenser & n represents the number of heaters?

The expression for temperature rise t in feedwater heater when a & b are the temperatures of boiler saturation & condenser respectively, is given by which of the following expression?

What is the value of “beta” if h represents the local enthalpy on the given expansion line at a given pressure & hf is the enthalpy of saturated water at that pressure?

THE_EXPRESSION_FOR_THE_OVERALL_TEMPERATURE_DIFFERENCE_T_IS_GIVEN_BY??$

The number of heaters for a plant is fixed by?$

Efficiency gain follows the law of?$

The expression for efficiency gain due to regeneration if a, b, n correspond to alpha, beta, cycle efficiency respectively, is?

What is the relation between a & c if a & c correspond to alpha & gamma respectively, for maximum efficiency of a cycle?

The expression for efficiency when a & b are two constants corresponding to alpha & beta and c corresponds to gamma, is?

The effect on the degree of regeneration due to an increase in feedwater temperature is?

If n denotes the number of heater, t denotes the overall temperature difference & T denotes the total temperature rise of feedwater. The expression for T is?

What is the expression for enthalpy of each heater h heater if a represents the enthalpy of heated feedwater from the economiser and b represents the enthalpy at condenser & n represents the number of heaters?

The temperature rise from condenser to boiler saturation is divided __________ among the feedwater heaters for maximum gain in efficiency.

The feedwater in the Economiser _________

The economiser can also be assumed as?

What happens to the feedwater that enters the economiser?

The expression for temperature rise t in feedwater heater when a & b are the temperatures of boiler saturation & condenser resprctively, is given by which of the following expression?

What is the value of ‚Äö√Ñ√∂‚àö√ë‚àö‚à´beta‚Äö√Ñ√∂‚àö√ë‚àöœÄ if h represents the local enthalpy on the given expansion line at a given pressure & hf is the enthalpy of saturated water at that pressure?