MECHANICAL ENGINEERING MCQ SECTION 13

121.Temperature of a gas is produced due to

(A)its heating value

(B) kinetic energy of molecules

(C) repulsion of molecules

(D) attraction of molecules

122.Zeroth law of thermodynamics

(A) deals with conversion of mass and energy

(B) deals with reversibility and irreversibility of process

(C) states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

(D) deals with heat engines

123.The efficiency of a Carnot engine depends on

(A) working substance

(B) design of engine

(C) size of engine

(D) temperatures of source and sink

124.A cycle consisting of two adiabatic and two constant pressure processes is known as

(A) Otto cycle

(B) Ericsson cycle

(C) Joule cycle

(D) Stirling cycle

125.This is the term for the range of tightness or looseness resulting from the allowances and tolerances in mating parts

(A) Limits

(B) Fit

(C) Specifications

(D) Allowance

126.A force is completely defined when we specify

(A) magnitude

(B) direction

(C) point of application

(D) all  the above

127.When trying to turn a key into a lock, following is applied?

(A) coplanar force

(B) non-coplanar forces

(C) moment

(D) couple

128.The units of moment of inertia of an area are

(A) kg m^2

(B) m^4

(C) kg/m^2

(D) m^3

129.The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of

(A) friction

(B) limiting friction

(C) Repose

(D) kinematic friction

130.Hooke’s law holds good up to

(A) yield point

(B) limit of proportionality

(C) breaking point

(D) elastic limit