Applied Thermal Engineering - Mechanical Engineering (MCQ) questions and answers

1)   Lancashire boilers are ______

a. externally fired boilers
b. internally fired boilers
c. both a. and b.
d. none of the above
Answer  Explanation 

ANSWER: internally fired boilers

Explanation:
No explanation is available for this question!


2)   What is the function of a moderator?

a. Increases the speed of neutrons
b. Increases the speed of electrons
c. Reduces the speed of neutrons
d. Reduces the speed of electrons
Answer  Explanation 

ANSWER: Reduces the speed of neutrons

Explanation:
No explanation is available for this question!


3)   One ton of refrigeration is equal to ______

a. 120 B Th U/hr
b. 200 B Th U/hr
c. 1200 B Th U/hr
d. 12000 B Th U/hr
Answer  Explanation 

ANSWER: 12000 B Th U/hr

Explanation:
No explanation is available for this question!


4)   Thermal efficiency of S.I. engines is low, due to ____

a. low compression ratio
b. high compression ratio


Answer  Explanation 

ANSWER: low compression ratio

Explanation:
No explanation is available for this question!


5)   Which of the following energy conversion devices convert heat into work?

a. Electrical generators
b. I. C engines
c. Condensers
d. All of the above
Answer  Explanation 

ANSWER: I. C engines

Explanation:
No explanation is available for this question!


6)   Smoke tube boilers have large water to steam ratio, hence _____

a. have high evaporation rates
b. are slow in operations
c. temperature stresses inducing failure of feed water arrangement are maximum
d. all of the above
Answer  Explanation 

ANSWER: are slow in operations

Explanation:
No explanation is available for this question!


7)   Which of the following statements are false for reaction turbines?

1. Flow of water can be regulated without any losses
2. It works on the principle of impulse and reaction
3. They are suitable for low heads
4. Water flows at constant atmospheric pressure over the runner


a. 1, 2 and 3
b. 2 and 4
c. 1 and 4
d. 1, 2, 3 and 4
Answer  Explanation 

ANSWER: 1 and 4

Explanation:
No explanation is available for this question!


8)   In four stroke cycle engine, cycle is completed in ______

a. two strokes of the piston
b. two revolutions of the crankshaft
c. three strokes of the piston
d. four revolutions of the crankshaft
Answer  Explanation 

ANSWER: two revolutions of the crankshaft

Explanation:
No explanation is available for this question!


9)   Pump transfers input mechanical energy of an engine, into ______

a. pressure energy of a fluid
b. kinetic energy of a fluid
c. both a. and b.
d. none of the above
Answer  Explanation 

ANSWER: both a. and b.

Explanation:
No explanation is available for this question!


10)   Which of the following protects penstock due to sudden variation of flow or velocity of water?

a. Anchors
b. Forebays
c. Trash rack
d. Surge tank
Answer  Explanation 

ANSWER: Surge tank

Explanation:
No explanation is available for this question!