Energy Engineering MCQs (Chapterwise Multiple Choice Questions)

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.

0.62

0.67

0.78

0.83

Answer & Explanation

Correct Answer: 0.62

Note: This Question is unanswered, help us to find answer for this one

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

51.3

54.6

60.8

65.5

Answer & Explanation

Correct Answer: 54.6

Note: This Question is unanswered, help us to find answer for this one

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

Turn-Off losses

Turn-On losses

Total switching losses

On-state losses

Answer & Explanation

Correct Answer: Turn-Off losses

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

Lateral sewer

lntercepting sewer

Outfall sewer

Main sewer

Answer & Explanation

Correct Answer: Outfall sewer

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

⅗

5/9

⅞

4/7

Answer & Explanation

Correct Answer: ⅞

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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.

4.4 x104 kg(f)/cm2

3.5 x104 kg(f)/cm2

7.6 x104 kgm/cm2

5.9 x104 kg(f)/cm2

Answer & Explanation

Correct Answer: 3.5 x104 kg(f)/cm2

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

-27

-40

-80

-273

Answer & Explanation

Correct Answer: -40

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

211

n/2v2

m2

n

Answer & Explanation

Correct Answer: n/2v2

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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.

3.67 w

4.28 w

4.83 w

5.14 w

Answer & Explanation

Correct Answer: 5.14 w

Note: This Question is unanswered, help us to find answer for this one

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)

103.4 mm

135.6 mm

121 mm

143.8 mm

Answer & Explanation

Correct Answer: 103.4 mm

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Energy Engineering Quick Quiz

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Start Practicing with our MCQs given below.

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