The turbine blades are

Question

The turbine blades are

C. Curved

Correct Answer :

C. Curved

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B. Scale

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In an impulse turbine, steam expands

Discuss this answer

The impulse reaction turbine has its driving force

Discuss this answer

Water tube boilers are those in which

Discuss this answer

The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in metres, and T₁ = Absolute temperature of air outside the chimney in K)

Discuss this answer

A safety valve usually employed with stationary boilers is

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The ratio of the volume at cut-off to the swept volume is called

Discuss this answer

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

Discuss this answer

The size of a boiler drum in pulverised fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

Discuss this answer

Superheating of steam is done at

Discuss this answer

The ratio of the actual vacuum to the ideal vacuum in a condenser is called

Discuss this answer

In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure.

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The function of injector used in small steam plants is to

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When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

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Which of the following coals has the highest calorific value?

D. Peat

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Efficiency of a thermal cycle increases by

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The shell of the Cochran boiler is made hemispherical

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It is required to produce large amount of steam at low pressure. Which boiler should be used?

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The ratio of total useful heat drop to the total isentropic heat drop, is called

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The fire tubes in a Scotch marine boiler are

Discuss this answer

Answer 1

A. Straight

Answer 2

B. Circular

Answer 3

D. None of these

Answer 4

A. Complete account of heat supplied by 1 kg of dry fuel and the heat consumed

Answer 5

B. Moisture present in the fuel

Answer 6

C. Steam formed by combustion of hydrogen per kg of fuel

Answer 7

D. All of the above

Answer 8

A. One half

Answer 9

B. One third

Answer 10

C. One fourth

Answer 11

D. One fifth

Answer 12

A. Corroding air heaters

Answer 13

B. Spontaneous combustion during coal storage

Answer 14

C. Facilitating ash precipitation

Answer 15

D. All of the above

Answer 16

A. From a metal wall from one medium to another

Answer 17

B. From heating an intermediate material and then heating the air from this material

Answer 18

C. By direct mixing

Answer 19

D. Heat is transferred by bleeding some gas from furnace

Answer 20

A. Serve as storage of steam

Answer 21

B. Serve as storage of feed water for water wall

Answer 22

C. Remove salts from water

Answer 23

D. Separate steam from water

Answer 24

A. V_b = 0.5 V cosα

Answer 25

B. V_b = V cosα

Answer 26

C. V_b = 0.5 V² cosα

Answer 27

D. V_b = V² cosα

Answer 28

A. Coking coal

Answer 29

B. Non-coking or free burning coal

Answer 30

C. Pulverised coal

Answer 31

D. High sulphur coal

Answer 32

A. Corrosion

Answer 33

C. Carryover

Answer 34

D. All of the above

Answer 35

A. High calorific value

Answer 36

B. Produce minimum smoke and gases

Answer 37

C. Ease in storing

Answer 38

D. High ignition point

Answer 39

A. One-fourth

Answer 40

B. One-third

Answer 41

C. Two-fifth

Answer 42

D. One-half

Answer 43

A. Reheat factor

Answer 44

B. Stage efficiency

Answer 45

C. Internal efficiency

Answer 46

D. Rankine efficiency

Answer 47

A. Wholly in blades

Answer 48

B. Wholly in nozzle

Answer 49

C. Partly in the nozzle and partly in blades

Answer 50

D. None of these

Answer 51

A. As an impulsive force

Answer 52

B. As a reaction force

Answer 53

C. Partly as an impulsive force and partly as a reaction force

Answer 54

D. None of the above

Answer 55

A. Flue gases pass through tubes and water around it

Answer 56

B. Water passes through the tubes and flue gases around it

Answer 57

C. Work is done during adiabatic expansion

Answer 58

D. Change in enthalpy

Answer 59

A. T₁ /88.25H

Answer 60

B. 88.25H/T₁

Answer 61

C. T₁ /176.5H

Answer 62

D. 176.5H/T₁

Answer 63

A. Lever safety valve

Answer 64

B. Dead weight safety valve

Answer 65

C. High steam and low water safety valve

Answer 66

D. All of these

Answer 67

A. Cut-off ratio

Answer 68

B. Expansion ratio

Answer 69

C. Clearance ratio

Answer 70

D. None of these

Answer 71

A. More heating surface

Answer 72

B. Less heating surface

Answer 73

C. Equal heating surface

Answer 74

D. Heating surface depends on other parameters

Answer 75

A. Increases

Answer 76

B. Decreases

Answer 77

C. Remains unchanged

Answer 78

D. Increases/decreases depending on steam temperature requirements

Answer 79

A. Constant volume

Answer 80

B. Constant temperature

Answer 81

C. Constant pressure

Answer 82

D. Constant entropy

Answer 83

A. Condenser efficiency

Answer 84

B. Vacuum efficiency

Answer 85

C. Nozzle efficiency

Answer 86

D. Boiler efficiency

Answer 87

A. Equal to

Answer 88

B. Lower than

Answer 89

C. Higher than

Answer 90

D. None of these

Answer 91

A. Create vacuum in furnace

Answer 92

B. Create vacuum at turbine exhaust

Answer 93

C. Pump feed water

Answer 94

D. Dose chemicals in feed water

Answer 95

A. Slow speed engine

Answer 96

B. Medium speed steam engine

Answer 97

C. High speed steam engine

Answer 98

D. None of these

Answer 99

A. Anthracite coal

Answer 100

B. Bituminous coal

Answer 101

C. Lignite

Answer 102

A. Regeneration

Answer 103

B. Reheating of steam

Answer 104

C. Both (A) and (B)

Answer 105

D. Cooling of steam

Answer 106

A. To give maximum space and strength

Answer 107

B. To withstand the pressure of steam inside the boiler

Answer 108

C. Both (A) and (B)

Answer 109

D. None of the above

Answer 110

A. Pulverised fuel fired boiler

Answer 111

B. Cochran boiler

Answer 112

C. Lancashire boiler

Answer 113

D. Babcock and Wilcox boiler

Answer 114

A. Stage efficiency

Answer 115

B. Internal efficiency

Answer 116

C. Rankine efficiency

Answer 117

D. None of these

Answer 118

A. Horizontal

Answer 119

B. Vertical

Answer 120

C. Inclined

Answer 121

D. None of these

The turbine blades are

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

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Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

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The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

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The ratio of the isentropic heat drop to the heat supplied, is called

In an impulse turbine, steam expands

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Water tube boilers are those in which

The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in metres, and T1 = Absolute temperature of air outside the chimney in K)

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The ratio of the volume at cut-off to the swept volume is called

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

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The ratio of the actual vacuum to the ideal vacuum in a condenser is called

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Which of the following coals has the highest calorific value?

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The shell of the Cochran boiler is made hemispherical

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