Fluid Mechanics Multiple Choice Questions on “Ideal Indicator Diagram”.
1. Which among the following can be assessed based on the indicator diagram?
a) Overall performance of engine
b) Area of the reservoir
c) Load the engine can take
d) Speed of the Engine
Answer: a
Clarification: The main purpose of the indicator diagram is to asses the overall performance of the engine. It is done by assessing the performance of each unit of the main engine. It plays an important role in the manufacture of ship engine.
2. How are the indicator diagrams drawn for the ship?
a) By providing the ship’s mass
b) By providing the ship’s volume
c) By matching ships sea trial diagrams
d) By differentiating the diagrams
Answer: c
Clarification: Indicator diagrams are drawn by taking the diagrams at regular intervals. This time taken at regular interval is matched with the ship’s sea trial diagrams. The comparison is to check if there is any significant difference in the performance.
3. Which among the following is not a type of indicator diagram?
a) Power card
b) Draw card
c) Compression diagram
d) Power house
Answer: d
Clarification: Power house is not a type of indicator diagram. It is also called as the power station. The main purpose of the power house is to supply electrical power to any system for an efficient working of the system.
4. Which among the following cannot be determined by indicator diagram?
a) The actual power generated
b) Cogeneration
c) Compression inside the cylinder
d) Exhausting and scavenging process
Answer: b
Clarification: Heat generated from clean heat and power is called as cogeneration. Cogeneration can be defined as combined heat and power that used to heat engine or the power station to generate electricity. Therefore, cogeneration cannot be determined by an indicator diagram.
5. High loading in engines will lead to_________
a) Speed rise
b) Temperature rise
c) Bearing damage
d) Volume expansion
Answer: c
Clarification: High loading in engines will lead to bearing damage. It also leads to several other problems like cracking, breaking etc. So, it is very important in assessing and reading these diagrams correctly.
6. What type of indicator device is used nowadays?
a) Digital pressure indicator
b) Mechanical indicator
c) Electrical indicator
d) Ionization Gauge
Answer: a
Clarification: In earlier days, the indicator diagram was assessed with the help of mechanical indicator. But now, we use a digital pressure indicator. It has got a lot of advantages over the mechanical one. It has a compact hand-held unit with a computer display system.
7. How can we asses the indicator diagram by looking at the card diagram?
a) Comparing the maximum firing pressure and compression pressure
b) Dead weight method
c) Conveyor method
d) Ionization method
Answer: a
Clarification: Using a card diagram, we can asses the indicator diagram. This process is performed using multiple parameters. One of them is the maximum firing pressure and the other is the comparison pressure.
8. Which among the following is not an effect of deficiency in the indicator diagram?
a) Bad quality of fuel
b) Fuel pump leakage
c) Low fuel pressure
d) Fuel temperature rise
Answer: d
Clarification: Deficiencies in an indicator diagram are classified into many types. Deficiencies can be determined using the card diagram. Card diagram contains maximum firing pressure and compression pressure which does not depend on the temperature rise of fluid.
9. Deficiency type 3 is not caused due to_________
a) Leaking exhaust valve
b) Resistance to flow of air
c) Low scavenging pressure
d) High linear wear
Answer: b
Clarification: Deficiencies in an indicator diagram are classified into many types. Deficiencies can be determined using the card diagram. Card diagram contains maximum firing pressure and compression pressure. In deficiency 3, the compression pressure is low and peak pressure is also low.
10. Deficiency type 4 is caused due to_________
a) Resistance to flow of air
b) Leaking exhaust valve
c) Low scavenging pressure
d) Overload of engine
Answer: d
Explanation Deficiencies in an indicator diagram are classified into many types. Deficiencies can be determined using the card diagram. Card diagram contains maximum firing pressure and compression pressure. In deficiency 4, compression pressure is high and peak pressure is also high leading to the overload of an engine.