List of top Mechanical Engineering Questions asked in Common University Entrance Test

A company requires 16,000 units of raw material costing Rs 2 per unit. The cost of placing an order is Rs 100 and the carrying costs are 10% per year per unit of the average inventory. The Economic Order Quantity (EOQ) is:

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Feed drives in CNC milling are provided by:

The DC power source for arc welding has the characteristics \( 3V + I = 240 \), where 'V' is the voltage in volts and 'I' is the current in amperes. For maximum power at the electrode, voltage should be set at:

A body starting with initial velocity zero, moves in a straight line as per the law \( s = 5t^3 - 3t^2 - 5 \) (where \( s \) is distance in meters and \( t \) is time in seconds). The acceleration of the particle after 0.5 seconds will be:

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According to maximum shear stress failure theory, yielding in material occurs when:

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During tensile tests on mild steel specimens, the following points are observed:
(A) Elastic limit
(B) Proportionality limit
(C) Yield Point
(D) Fracture point
Choose the correct sequence of observation after the application of loading:

If a helical spring is halved in length, its spring stiffness remains:

In a psychrometric chart, what does a vertical downward line represent?

The Nusselt number is related to the Reynolds number in laminar and turbulent flows respectively as:

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List-I (Details of the processes of the cycle)	List-II (Name of the cycle)
(A) Two adiabatic, one isobaric and two isochoric	(I) Diesel
(B) Two adiabatic and two isochoric	(II) Carnot
(C) Two adiabatic, one isobaric and one isochoric	(III) Dual
(D) Two adiabatics and two isothermals	(IV) Otto

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An impulse turbine produces 50 kW of power when the blade mean speed is 400 m/s. What is the rate of change of momentum tangential to the rotor?

The equation of free vibration of a system is \( X + 36\pi^2 X = 0 \). Its natural frequency is:

If the kinetic energy of the body with constant mass becomes four times the initial value, then the new momentum will be:

In which one of the following materials the heat energy propagation is minimum due to conduction heat transfer?

Gas contained in a closed system consisting of a piston-cylinder arrangement is expanded. Work done by the gas during expansion is 50 kJ. The decrease in internal energy of the gas during expansion is 30 kJ. The heat transfer during the process is equal to:

The latent heat of vaporization at the critical point is

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List-I	List-II
(A) Work done in a polytropic process	(IV) \( \frac{p_1 V_1 - p_2 V_2}{n - 1} \)
(B) Work done in a steady flow process	(I) \( - \int v \, dp \)
(C) Heat transfer in a reversible adiabatic process	(II) Zero
(D) Work done in an isentropic process	(III) \( \frac{p_1 V_1 - p_2 V_2}{\gamma - 1} \)

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Which thermodynamics law predicts correctly the degree of completion of a chemical reaction?

The thickness of a laminar boundary layer at a distance \( x \) from the leading edge over a flat plate varies as

A refrigerating machine working on a reversed Carnot cycle takes out 2 kW of heat from the system while working between temperature limits of 300K and 200K. The coefficient of performance and power consumed by the cycle will be respectively:

The ratio of is given as \( \frac{E{\lambda}_1 b_2}{E{\lambda}_1 b_1} \) is given as:

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List-I (Dimensionless Numbers)	List-II (Relationship)
(A) Froude's Number	(II) \( \sqrt{\frac{\text{Inertia force}}{\text{Gravity force}}} \)
(B) Mach's Number	(IV) \( \sqrt{\frac{\text{Inertia force}}{\text{Elastic Force}}} \)
(C) Euler's Number	(I) \( \frac{\text{Pressure Force}}{\text{Inertia Force}} \)
(D) Weber's Number	(III) \( \frac{\text{Inertia Force}}{\text{Surface Tension Force}} \)

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