Power Plant Engineering

51. Rankine efficiency of a steam power plant

  1. improves in summer as compared to that in winter
  2. improves in winter as compared to that in summer
  3. is unaffected by climatic conditions
  4. none of the above

Correct answer: (B)
improves in winter as compared to that in summer

52. Rateau steam turbine is

  1. reaction steam turbine
  2. velocity compounded impulse steam turbine
  3. pressure compounded impulse steam turbine
  4. pressure velocity compounded steam turbine

Correct answer: (C)
pressure compounded impulse steam turbine

53. Regenerative cycle thermal efficiency

  1. is always greater than simple Rankine thermal efficiency
  2. is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure
  3. is same as simple Rankine cycle thermal efficiency
  4. is always less than simple Rankine cycle thermal efficiency

Correct answer: (A)
is always greater than simple Rankine thermal efficiency

54. Reheat cycle in steam power plant is used to

  1. utilise heat of flue gases
  2. increase thermal efficiency
  3. improve condenser performance
  4. reduce loss of heat

Correct answer: (B)
increase thermal efficiency

55. Reheat factor in steam turbines depends on

  1. exit pressure only
  2. stage efficiency only
  3. initial pressures and temperature only
  4. all of the above

Correct answer: (C)
initial pressures and temperature only

56. Reheat factor is the ratio of

  1. isentropic heat drop to useful heat drop
  2. adiabatic heat drop to isentropic heat drop
  3. cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop
  4. none of the above

Correct answer: (C)
cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop

57. Secondary air is the air used to

  1. reduce the flame length
  2. increase the flame length
  3. transport and dry the coal
  4. provide air round the burners for getting optimum combustion

Correct answer: (D)
provide air round the burners for getting optimum combustion

58. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of

  1. 20 kgf/cm2
  2. 50 kgf/cm2
  3. 100 kgf/cm2
  4. 150 kgf/cm2

Correct answer: (D)
150 kgf/cm2

59. Steam turbines are governed by the following methods

  1. Throttle governing
  2. Nozzle control governing
  3. By-pass governing
  4. all of the above

Correct answer: (D)
all of the above

60. Steam turbines commonly used in steam power station are

  1. condensing type
  2. non-condensing type
  3. none of the above
  4. all of the above

Correct answer: (A)
condensing type

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