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General MCQ for Energy Engineering

1. Which of the following expressions calculates the overland flow time (To in hours) for any basin? Where, L0 = distance of critical point and H = difference in elevation.

2. Which of the following cycles works as a reverse of Bell-Coleman air refrigeration cycle?

3. If T9 is generator temperature, T8 is evaporator temperature and Ta is environmental temperature; then which of the following gives the theoretical maximum COP of a vapour absorption system?

4. Forty percent of the heat supplied is rejected by a reversible heat engine during a cycle of operation. What will be the COP if this engine is reversed and used as a heat pump?

5. The ratio between the high and the low working temperatures of a refrigerator based on reversed Carnot Cycle is 0.6. If a heat pump is operated between this same temperature range. what will be the COP of the heat pump?

6. In the given image. which of the following curves is applicable when the thermal conductivity of a material increases with increase in temperature?

7. What will be the cycle eff‌iciency for the maximum work capacity in a gas turbine operating on Brayton cycle? It is given that the Brayton cycle has maximum temperature of 1250 K and minimum temperature of 350K.

8. What is the area of cross-section of a standard egg shaped-sewer. where diameter of the upper circular portion is D?

9. What is ratio of the lower to the higher absolute temperatures for a Carnot refrigerator that has a COP = 7?

10. Assuming the energy released by coal as 92OX107 kJ/h, calculate the rate at which heat is rejected from a thermal electric power plant, which produces 1200 MW of power.

11. In a stainless f‌in (thermal conductivity = 0.18 W/cm°C)of a constant cross-sectional area of 2.5 cm2 and length 1 cm exposed to ambient temperature of 50°C (with a surface heat transfer co-eff‌icient of 0.003W/cm2°C). the temperature distribution is given by (T - T...) = 3x2 - 5x + 6. where T is in °C and x is in cm. Find heat dissipated by the f‌in surface for a base temperature 120°C.

12. A sharp edged vertical orif‌ice issues a jet of water under a constant head of 0.55 m. The horizontal and vertical co-ordinates measured from the vena-contracta. at a certain point of issuing jet. are 0.512m and 0.09m, respectively. Assuming Cd = 0.7, find the value of CC.

13. Given. 5 = potential inf‌iltration and p = rainfall (in centimetre) in a drainage of a soil with fair pasture cover. The direct runoff Q can be calculated by using which of the following expressions?

14. A gas turbine is supplied with gas at 1200 K and 10 bar to expand adiabatically to 2 bar. Find the power developed in kW/kg of gas per second and the exhaust gas temperature. Mean specif‌ic heat at constant pressure is 1.0425 kJ/kgK and mean specific heat at constant volume is 0.7662 kJ/kgK.

15. A 250 mm pipe line has a pitot-static tube paced in its centre, with one orif‌ice pointing upstream and the other perpendicular to it. Assuming the pressure difference between the two orifices to be 50 mm of water when discharge through the pipe is 1500 L/min and the mean velocity in the pipe to be 0.83 of the central velocity, find the coeff‌icient of the pitot tube.

16. Calculate the peripheral velocity of a Pelton wheel, whose speed ratio while operating under a head of 950 m is 0.4.

17. A pipe of diameter 0.2 m is to be f‌itted with a venturi meter, where the pressure head of the flowing liquid is 7.2 m and the maximum flow is 6 m3/min. What is the least diameter of the throat to make sure that the pressure head does not become negative? (Consider K = 0.96)

18. Sewage is unloaded at the point of treatment through which of the following types of sewer systems?

19. If a 5 KW, 25 litre water heater is switched on for 15 minutes and all the electrical energy goes into the heating of water, then what is the increase in temperature of water? (Take Cp of water = 4 KJ/Kg K.)

20. Which of the following options give the NTU of a heat exchanger with heat transfer surface area = A and overall heat transfer coefficient = U, considering it is handling two fluids of heat capacities. C1 and C2 such that C1> C2?

21. Which of the following components of power dissipation in a Power Semiconductor device is reduced by an RCD Switching-Aid-Network?

22. The volume of a liquid decreases by 0.2% if the pressure of the liquid is increased from 80 kg(f)/cm2 to 150 kg(f)/cm2. Calculate the bulk modulus of elasticity of the liquid.

23. For controlling gas and leachate moments, which material should be used as landf‌ill salient?

24. A water turbine that does NOT require a draft tube is called a:

25. A single-phase full-wave rectif‌ier has an output voltage form factor of:

26. At what temperature, do centigrade and Fahrenheit scales have same reading?

27. The diameter of a small sphere is 4 mm and its specif‌ic gravity is 2.7. If the sphere falls 0.5 m in 20 5 through a liquid whose specific gravity is 0.9, what is the absolute viscosity of the liquid?

28. Which of the following factors affect the time of overland f‌low?

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