List of top Mechanical Engineering Questions asked in Andhra Pradesh Post Graduate Engineering Common Entrance Test

The effectiveness of a heat exchanger is defined as the ratio of the actual heat transfer rate to

What is the relation for the pressure difference \( P_1 - P_2 \) for the flow device shown in Figure? (\( \rho \) is density of the fluid; \( a, h \) are column heights)

If the radius of a current carrying wire is less than the critical radius, then the addition of electrical insulation will enable the wire to carry a higher current because:
The air standard cycle involving constant pressure heat addition and constant volume heat rejection corresponds to

A process is described by 1-2-3 on a Psychrometric chart. Name the process in the same sequence.

In the heat flow equation, \( Q = -kA \frac{\Delta T}{L} \), the expression for thermal resistance is given by (k - thermal conductivity, A - Area of cross section, L - thickness of the wall)
Which two properties are sufficient to define the state point of moist air?
A fin of length \( L \) is applied the boundary conditions associated with a very long fin, the adiabatic tip fin, and the finite convective tip fin, which of the following observation about the fin-tip temperature (\( T \)) for these three cases is correct.
Which of the following equation is the basis for the construction of Mollier diagram? (P- Pressure, V- Volume, T- Temperature, U- Internal Energy, h - Enthalpy, s - Entropy)
A pure substance is a substance of constant composition throughout its mass and follows
A thermodynamic cycle is impossible if
Carnot cycle is different from Rankine cycle in steam power plant during the following process.
What is the effect of involving Reheat and Regenerative cycle individually on cycle efficiency in the same sequence?
The efficiency of Brayton cycle corresponding to maximum net work obtained for \( T_{\text{max}} = 900 \, \text{K} \) and \( T_{\text{min}} = 400 \, \text{K} \) is given by
A heat engine is supplied with 250 kJ/s of heat at a constant temperature of 227°C; the heat is rejected at 27°C. If the cycle is reversible, then the amount of heat rejected is:

The cycle shown in Figure is composed of internally reversible processes on a T-S diagram. Which of the following is the expression for thermal efficiency in terms of the temperatures?

Which of the following is not an extensive property?
Heat Engine cycle represents the devices Boiler (B), Condenser (C), Pump (P) and Turbine (T) arranged in the sequence of:
An ideal gas at \( 27^\circ C \) is heated at constant pressure till the volume becomes three times. The temperature of the gas will be
Sommerfeld number consists of parameters
Joule’s experiment states that for a cyclic process
During one cycle the working fluid in an engine engages in two work interactions: 15 kJ to the fluid and 45 kJ from the fluid, and three heat interactions, two of which are known: 75 kJ to the fluid and 40 kJ from the fluid. The magnitude and direction of the third heat transfer is
An element is subjected to a tensile stress of 60 MPa and a shear stress of 40 MPa. If the material has the yield strength obtained in a simple tensile test is 320 MPa, the factor of safety based on maximum principal stress theory is
Two mating spur gears have 36 and 108 teeth, respectively. The pinion rotates at 1200 rpm and transmits a torque of 20 Nm. The torque transmitted by the gear is
In the multiple disc clutch, if there are six discs on the driving shaft and five discs on the driven shaft, then the number of pairs of contact surfaces will be