Steam Boilers, Engines, Nozzles & Turbines Mcqs - Set 5

1)   Cochran boiler is a__________________?

a. horizontal fire-tube boiler
b. horizontal water-tube boiler
c. veritcal water-tube boiler
d. vertical fire tube boiler
e. forced circulating boiler
Answer  Explanation 

ANSWER: vertical fire tube boiler

Explanation:
No explanation is available for this question!


2)   During polytropic process_________________?

a. heat transfer takes place across cylinder walls
b. work is done
c. steam may be wet, dry or superheated after expansion
d. all of the above
e. none of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


3)   The evaporation of 15.653 kg of water per hour from and at 100°C is called_________________?

a. evaporative capacity
b. factor of evaporation
c. equivalent evaporation
d. one boiler h.p.
e. boiler efficiency
Answer  Explanation 

ANSWER: one boiler h.p.

Explanation:
No explanation is available for this question!


4)   Mechanical equivalent of heat for 1 kcal or Joule’s equivalent is equal to_________________?

a. 421 kgm
b. 421 kgm
c. 539 kgm
d. 102 kgm
e. 75 kgm
Answer  Explanation 

ANSWER: 421 kgm

Explanation:
No explanation is available for this question!


5)   Pick up the wrong statement about critical condition of steam___________________?

a. latent heat is zero
b. liquid directly becomes steam
c. specific volume of steam and liquid is same
d. this is the maximum pressure limit
e. all properties of liquid and steam are same
Answer  Explanation 

ANSWER: this is the maximum pressure limit

Explanation:
No explanation is available for this question!


6)   Adiabatic process is________________?

a. essentially an isentropic process
b. non-heat transfer process
c. reversible process
d. constant temperature process
e. constant enthalpy process
Answer  Explanation 

ANSWER: non-heat transfer process

Explanation:
No explanation is available for this question!


7)   While steam expands in turbines, theoretically the entropy________________?

a. remains constant
b. increases
c. decreases
d. behaves unpredictably
e. none of the above
Answer  Explanation 

ANSWER: remains constant

Explanation:
No explanation is available for this question!


8)   At which pressure the properties of water and steam become identical_________________?

a. 0.1 kg/cm2
b. 1 kg/cm2
c. 100 kg/cm2
d. 225.6 kg/cm2
e. it is never possible
Answer  Explanation 

ANSWER: 225.6 kg/cm2

Explanation:
No explanation is available for this question!


9)   The latent heat of steam with increase of pressure__________________?

a. remains same
b. increases
c. decreases
d. behaves unpredictably
e. none of the above
Answer  Explanation 

ANSWER: decreases

Explanation:
No explanation is available for this question!


10)   The pressure at which latent heat of vaporisation of water is zero, is_________________?

a. below atmospheric pressure
b. 1 kg/cm2
c. 100 kg/cm2
d. 170 kg/cm2
e. 225.6 kg/cm2
Answer  Explanation 

ANSWER: 225.6 kg/cm2

Explanation:
No explanation is available for this question!


11)   In a throttling process________________?

a. steam temperature remaisn constant
b. steam pressure remains constant
c. steam enthalpy remains constant
d. steam entropy remains constant
e. steam volume remains constant
Answer  Explanation 

ANSWER: steam enthalpy remains constant

Explanation:
No explanation is available for this question!


12)   Water at pressure of 4 kg/cm2 and 160°C temperature when exposed to atmosphere will_________________?

a. boil
b. flash i.e. get converted into steam
c. remain as it was
d. cool down
e. none of the above
Answer  Explanation 

ANSWER: flash i.e. get converted into steam

Explanation:
No explanation is available for this 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%.
Answer  Explanation 

ANSWER: 78-81%

Explanation:
No explanation is available for this question!


14)   On Millier chart, the constant pressure lines_________________?

a. diverge from left to right
b. diverge from right to left
c. are equally spaced throughout
d. first rise up and then fall
e. none of the above
Answer  Explanation 

ANSWER: diverge from left to right

Explanation:
No explanation is available for this question!


15)   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
Answer  Explanation 

ANSWER: vertical straight line

Explanation:
No explanation is available for this question!


16)   The difference between cornish boiler and lancashire boiler is that_________________?

a. former is fire tube type and latter is water tube type boiler
b. former is water tube type and latter is fire tube type
c. former contains one fire tube and latter contains two fire tubes
d. none/of the above
Answer  Explanation 

ANSWER: former contains one fire tube and latter contains two fire tubes

Explanation:
No explanation is available for this question!


17)   If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by___________________?

a. throttling calorimeter
b. separating calorimeter
c. combined separating and throttling calorimeter
d. bucket calorimeter
e. none of the above
Answer  Explanation 

ANSWER: throttling calorimeter

Explanation:
No explanation is available for this question!


18)   The number of drums in Benson steam generator is_________________?

a. one
b. two
c. one steam drum and one water drum
d. no drum
e. none of the above
Answer  Explanation 

ANSWER: no drum

Explanation:
No explanation is available for this question!


19)   The fusible plug in small boilers is located ________________?

a. in the drum
b. in the fire tubes
c. above steam dome
d. over the combustion chamber
e. at the inlet of chimney
Answer  Explanation 

ANSWER: over the combustion chamber

Explanation:
No explanation is available for this question!


20)   Boiler H.P. is defined as the ________________ ?

a. steam evaporation rate per kg of fuel fired
b. work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
c. the evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
d. work done by 1 kg of steam at saturation condition
e. heat consumed in evaporating 1 kg water at 0°C to steam at 100°C and 1.033 kg/cm pressure
Answer  Explanation 

ANSWER: the evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam

Explanation:
No explanation is available for this question!