1. In a centrifugal pump, the pressure is highest at which part?
A. Impeller inlet
B. Impeller outlet
C. Pump casing
D. Shaft
Answer: b) Impeller outlet
Rationale: The pressure is highest at the impeller outlet due to the conversion of velocity energy
into pressure energy as the fluid leaves the impeller.
2. In a Rankine cycle, what is the working fluid?
A. Water
B. Air
C. Ammonia
D. R-134a
Answer: a) Water
Rationale: The Rankine cycle typically uses water as the working fluid, which undergoes phase
changes from liquid to vapor and vice versa.
3. What does Reynolds number indicate?
,A. Heat transfer rate
B. Fluid velocity
C. Type of flow
D. Pressure difference
Answer: c) Type of flow
Rationale: Reynolds number indicates the type of fluid flow—whether it is laminar (Re < 2000),
turbulent (Re > 4000), or transitional (2000 < Re < 4000).
4. What is the efficiency of an ideal Carnot engine operating between 400K and 300K?
5. The second law of thermodynamics is concerned with:
A. Conservation of mass
B. Energy transformations
C. Entropy changes
D. Thermodynamic equilibrium
Answer: c) Entropy changes
Rationale: The second law of thermodynamics states that the entropy of an isolated system never
decreases, often referred to as the law of increased disorder.
6. Which of the following is NOT a type of fluid flow?
A. Laminar flow
, B. Turbulent flow
C. Rotational flow
D. Ideal flow
Answer: d) Ideal flow
Rationale: Ideal flow is a theoretical concept used in fluid dynamics, whereas laminar, turbulent,
and rotational flows are real types of flow in fluid mechanics.
7. What is the unit of torque?
A. Watt
B. Joule
C. Newton meter
D. Kilogram meter
Answer: c) Newton meter
Rationale: Torque is the rotational equivalent of force, and its unit is the Newton meter (Nm).
a) 0.25
b) 0.5
c) 0.75
d) 0.8
Answer: c) 0.75
Rationale:
A. Impeller inlet
B. Impeller outlet
C. Pump casing
D. Shaft
Answer: b) Impeller outlet
Rationale: The pressure is highest at the impeller outlet due to the conversion of velocity energy
into pressure energy as the fluid leaves the impeller.
2. In a Rankine cycle, what is the working fluid?
A. Water
B. Air
C. Ammonia
D. R-134a
Answer: a) Water
Rationale: The Rankine cycle typically uses water as the working fluid, which undergoes phase
changes from liquid to vapor and vice versa.
3. What does Reynolds number indicate?
,A. Heat transfer rate
B. Fluid velocity
C. Type of flow
D. Pressure difference
Answer: c) Type of flow
Rationale: Reynolds number indicates the type of fluid flow—whether it is laminar (Re < 2000),
turbulent (Re > 4000), or transitional (2000 < Re < 4000).
4. What is the efficiency of an ideal Carnot engine operating between 400K and 300K?
5. The second law of thermodynamics is concerned with:
A. Conservation of mass
B. Energy transformations
C. Entropy changes
D. Thermodynamic equilibrium
Answer: c) Entropy changes
Rationale: The second law of thermodynamics states that the entropy of an isolated system never
decreases, often referred to as the law of increased disorder.
6. Which of the following is NOT a type of fluid flow?
A. Laminar flow
, B. Turbulent flow
C. Rotational flow
D. Ideal flow
Answer: d) Ideal flow
Rationale: Ideal flow is a theoretical concept used in fluid dynamics, whereas laminar, turbulent,
and rotational flows are real types of flow in fluid mechanics.
7. What is the unit of torque?
A. Watt
B. Joule
C. Newton meter
D. Kilogram meter
Answer: c) Newton meter
Rationale: Torque is the rotational equivalent of force, and its unit is the Newton meter (Nm).
a) 0.25
b) 0.5
c) 0.75
d) 0.8
Answer: c) 0.75
Rationale:
