List of practice Questions

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)

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?

Sommerfeld number consists of parameters

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

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

The design stress for a component subjected to a completely reversible load, is found by applying the factor of safety to:

In eccentric loading of welds, the stress which vary from point to point as proportional to its distance from the centre of gravity, is known as:

A solid uniform shaft of circular cross section is subjected to a maximum bending moment of 3 kNm and a twisting moment of 4 kNm. The equivalent torsional moment 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

The direction of the linear velocity of any point on the kinematic link relative to any other point on the same kinematic link is

The area under the turning moment diagram represents

In a simple gear train, if the number of idler gears is odd, then the direction of motion of the driven gear will be:

A 10 kg mass is supported on a spring of stiffness 4 kN/m and has a dashpot which produces a resistance of 20 N at a velocity of 0.25 m/s. The damping ratio of the system is:

Whirling speed of a shaft coincides with the natural frequency of its: