Multiple Choice Questions (MCQ) with Answers on Mechanical Engineering

Multiple Choice Questions (MCQ) with Answers on Mechanical Engineering

1-Which one of the following relations defines Hermholtz function F?

(A) H+TS

(B) H-TS

(C) U+TS

(D) U-TS

 

2-Second law of Thermodynamics defines:

(A) Efficiency

(B) Enthalpy

(C) Internal energy

(D) Entropy

 

3-Which parameter remains constant during a reversible adiabatic process?

(A) Enthalpy

(B) Temperature

(C) Entropy

(D) Internal energy

 

4-Which parameter remains constant during Joule Thomson expansion?

(A) Temperature

(B) Pressure

(C) Enthalpy

(D) Volume

 

5-For an ideal gas the compressibility factor is

(A) Zero

(B) Unity

(C) Infinity

(D) None

 

6-Which one of the following is the extensive property of the system?

(A) Volume

(B) Pressure

(C) Temperature

(D) Density

 

7-An example of a turbine with high head and low specific speed is:

(A) Kaplan

(B) Francis

(C) Pelton

(D) None

 

8-The ratio of the pitch diameter of pelton wheel to the diameter of the jet is called:

(A) Jet ratio

(B) Speed ratio

(C) Wheel ratio

(D) None of the above

 

9-The specific speed of a Francis turbine which develops 7225 kW power under a head of 25 metres at 135 rpm is:

(A) 150

(B) 180

(C) 195

(D) 205

 

10-The head loss due to friction for the flow of water through penstocks can be minimized by:

(A) Decreasing the diameter of penstock

(B) Increasing the diameter of penstock

(C) Increasing the length of penstock

(D) Increasing the velocity of flow

 

ANSWERS:

1-(D), 2-(D), 3-(C), 4-(A), 5-(B), 6-(A), 7-(C), 8-(A), 9-(D), 10-(B)