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UP Polytechnic Lecturer: Mechanical Paper -2 || Quiz 7
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Question 1
In a polytropic process, the term
is equal to:
is equal to: Question 2
An ideal Otto-cycle works between minimum and maximum temperature of 300 K and 1800 K. What is the compression ratio of the cycle for maximum work output when γ = 1.5 for this ideal gas?
Question 3
In conventional refrigerants what is the element responsible for ozone depletion?
Question 4
Under ideal conditions, the velocity of steam at the outlet of a nozzle for a heat drop of 450 kJ/kg from inlet reservoir condition upto the exit is:
Question 5
The oil with specific gravity 0.8, dynamic viscosity of 8 × 10–3 Ns/m2 flows through a smooth pipe of 100 mm diameter and with Reynolds number 2100. The average velocity in the pipe is:
Question 6
Assigning the basic dimesion to mass, length, time and temperature respectively as M,L, T and 
(Temperature), what is the dimesion of entropy?
(Temperature), what is the dimesion of entropy? Question 7
A fluid is flowing over a flat plate. At distance of 8 cm from the leading edge, the Reynolds number is found to be 25600. The thickness of the boundary layer at this point is
Question 8
To get supersonic velocity of steam at nozzle exit with a large pressure drop across it, the duct must
Question 9
A reversed Carnot cycle working as a heat pump has a COP of 7. What is the ratio of minimum to maximum absolute temperatures?
Question 10
Which one of the following accessories is connected to the steam supply pipe line to maintain constant pressure?
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