Multiple Choice Questions (MCQ) with Answers on Mechanical Engineering
31-The power transmitted by the belt is maximum when the maximum tension in the belt is:
(A) Equal to centrifugal tension
(B) Two times the centrifugal tension
(C) Three times the centrifugal tension
(D) Four times the centrifugal tension
32-Bevel gears are used to transmit rotary motion between two shafts when axes are:
(A) Non intersecting and non parallel
(B) Parallel and coplanar
(C) Non coplanar
(D) Non parallel or intersecting but coplanar
33-An ideal gas of mass ‘m’ and temperature T1 undergoes a reversible isothermal process from an initial pressure p1 to final pressure p2. The heat loss during the process is Q. The entropy change of the gas is:
(A) mRln(p2/p1)
(B) mRln(p1/p2)
(C) mRT
(D) Zero
34-Heat and Work are
(A) Path function
(B) Intensive properties
(C) Point function
(D) None of the above
35-If a closed system is undergoing an irreversible process, the entropy of the system
(A) Must decrease
(B) Zero
(C) Must increase
(D) Remain constant
36-A positive value of Joule Thomson coefficient of a liquid means
(A) Temperature drops during throttling
(B) Temperature remains constant
(C) Temperature rises during throttling
(D) None of the above
37-Usually in the window air conditioning, the expansion device used is
(A) Capillary tube
(B) Thermostatic expansion valve
(C) Gate valve
(D) None of the above
38-Dew point temperature is the temperature at which condensation begins when the air is cooled at constant
(A) Temperature
(B) Entropy
(C) Pressure
(D) Enthalpy and Volume
39-Which of the following is TRUE?
(A) Metacentre should be below centre of gravity
(B) Metacentre should be above centre of gravity
(C) Metacentre and centre of gravity must lie on the same horizontal line
(D) None of the above
40-The continuity equation is derived based on fundamental principle of
(A) Law of conservation of energy
(B) Law of conservation of momentum
(C) Law of conservation of mass
(D) All of the above
ANSWERS:
31-(C), 32-(D), 33-(B), 34-(A), 35-(C), 36-(A), 37-(A), 38-(C), 39-(B), 40-(C)