These Energy Engineering multiple-choice questions and their answers will help you strengthen your grip on the subject of Energy Engineering. You can prepare for an upcoming exam or job interview with these 80+ Energy Engineering MCQs.

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A. 2200 kg/m3

B. 2400 kg/m3

C. 2620 kg/m3

D. 2840 kg/m3

The work ratio of a gas turbine plant working on a Joule cycle is 45%. If it produces 5000 kW of power, what is the power consumed by the compressor?

A.

4512.8 kW

B.

5081.3 kW

C.

6111.11 kW

D.

8304.5 kW

A. 0.8

B. 1.03

C. 1.25

D. 1.67

A. 2.3 m3/s

B. 1.98 m3/s

C. 2-5 m3/s

D. 3.1 m3/s

A. 546.65 kcal/hr

B. 587.32 kcal/hr

C. 612.24 kcal/hr

D. 643.16 kcal/hr

A. hmic mode

B. Saturation mode

C. Active mode

D. Cut-off mode

A. a)

B. b)

C. C)

D. d)

A.

a)

B.

b)

C.

C)

D.

d)

A. Ericsson cycle

B. Brayton cycle

C. Otto cycle

D. Rankine cycle

A. 1:5

B. 5:1

C. 1:9

D. 9:1

A. CO

B. C02

C. CH 4

D. H2S

A.

a)

B.

b)

C.

c)

D.

d)

A. co and N02

B. co2 and N02

C. so2 and co

D. CH4 and co2

To calculate the velocity of flow in a circular sewer of diameter 'D' (running full) using Chezy's formula {V=C «/ (rs)], what should be the value of hydraulic mean radius (where. r= hydraulic mean depth of flow and S: hydraulic gradient)?

A. D/2

B. D/4

C. D/6

D. D/8

Given,

n = rugosity coefficient,

r = hydraulic depth and.

s = bed slope of sewer

The formula ("V=1/n r288”) for determining the velocity of flow in m/s was evolved by which of the following?

A.

Kuichling

B.

Fruhling

C.

Chezy

D.

Manning

The settlement velocity of the particles is calculated using Hazin‘s formula,

VS = 418(GS-Gw)d[3T+7O/100 ] (where symbols have their usual meaning). when the particle diameter is:

A.

less than 0.02 mm

B.

greater than 0.01 mm

C.

less than 0.1 mm

D.

more than 0.1 mm

A. ⅓

B. 114

C. 3/4

D. 5/4

A. 800°C

B. 695°C

C. 1485°C

D. 1032°C

A. 104 m

B. 83.7 m

C. 62.5 m

D. 51.9 m

A.

a)

B.

b)

C.

c)

D.

d)

A.

a)

B.

b)

C.

C)

D.

d)

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?

A.

1.8

B.

2.3

C.

2.5

D.

2.9

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?

A.

5

B.

4.3

C.

3.6

D.

2.5

A. 360 kJ

B. 396.6 kJ

C. 458.7 kJ

D. 480 kJ

A.

A

B.

B

C.

C

D.

D

What is the expression for the maximum blade efficiency of a Parson's turbine? Where, a = jet angle at the entrance.

A. Cos2a/(1- Cos2a)

B. (2 Cos2a)/( 1+ Cos2a)

C. Cosu/2

D. C0520

A. 35%

B. 43%

C. 47%

D. 51%

A. 150 to 320

B. 310 to 500

C. 600 to 770

D. 850 to 1200

A. 1.2

B. 1.5

C. 2.3

D. 3.6

A.

a)

B.

b)

C.

C)

D.

d)

A. 0.41

B. 0.56

C. 0.62

D. 0.83

A. nD8/3 ___ 4a8/3

B. 1-D5/3 = 4a5/3

C. nD8/3 : 4a5/3

D. nD3/5 = 4a8/3

A.

a)

B.

b)

C.

c)

D.

d)

A. ⅗

B. 5/9

C. ⅞

D. 4/7

Fill in the blank.

The value of B for a power BJT with IC =18 A. la = 2.2 A and 'cs =14 mA is .

A.

7.63

B.

8.12

C.

8.73

D.

9.34

A. CA ⅓

B. CA ⅕

C. CA ⅔

D. CA 2/5

A. 0

B. 30%

C. 80%

D. 100%

A. 530.2 MW

B. 780.9 MW

C. 1100.3 MW

D. 1355.5 MW

A. 3.67 w

B. 4.28 w

C. 4.83 w

D. 5.14 w

A. 180.71 KJ/s

B. 203.4 KJ/s

C. 229.5 KJ/s

D. 253.5 KJ/s

A. 0.48

B. 0.53

C. 0.6

D. 0.71

A.

a)

B.

b)

C.

c)

D.

d)

A. 0.57

B. 0.73

C. 0.92

D. 1.06

A. 0.53

B. 0.66

C. 0.82

D. 0.97

A. 876 kW/kg and 984 K. respectively

B. 672 kW/kg and 732 K. respectively

C. 434 kW/kg and 784 K, respectively

D. 381 kW/kg and 539 K. respectively

A.

a)

B.

b)

C.

C)

D.

d)

A.

a)

B.

b)

C.

C)

D.

d)

A. 0.62

B. 0.67

C. 0.78

D. 0.83

Given below is the information regarding a steam power plant.

Power developed by the turbine = 1300 kW

Heat supplied to the boiler = 3400 kJ/kg

Heat rejected by the system to cooling water = 2500 kJ/kg

Teed pump work required to condensate back into the boiler = 7kW

What will be the mass flow rate through the cycle?

A.

0.85 kg/s

B.

1.4 kg/s

C.

2.9 kg/s

D.

3.6 kg/s

A. Ethylene

B. Ethene

C. Methane

D. Benzene