Power Plant Engineering MCQ

41. In pump storage hydro-power-plant, the electrical machine is made to work alternately as generator and motor. The efficiency of the generator working at the same electric power level is

(a) greater than that as motor.
(b) equal to that as motor.
(c) less than that as motor.
(d) greater or less than that as motor depending on the type of the – machine.

42. A ‘Pumped storage hydroelectric plant’ consists of

(a) A synchronous machine and a multistage centrifugal pump in one shaft.
(b) A synchronous machine, a reaction turbine, and a multistage centrifugal pump all fit one shaft.
(c) An induction generator, a synchronous machine and a reaction turbine, all in one shaft.
(d) An induction generator, a synchronous machine, and a multistage centrifugal pump, all in one shaft.

43. Consider the following statements: Pumped storage plants when operated in interconnected power systems serve to

1. increase load factor of steam plant.
2. provide added capacity to meet peak loads.
3. decrease load factor of steam plant.
4. provide added capacity to meet base loads. Which of the above statements are correct?

(a) 1, 2, 3 and 4.
(b) 1 and 3 only.
(c) 1 and 2 only.
(d) 3 and 4 only.

44. Consider the following statements regarding the pumped storage plants:

1. A pumped storage plant is a peak load plant.
2. The starting time of a pumped storage plant is very long.
3. Reversible turbines and pumps are very suitable for pumped storage plants.
4. Pumped storage plants can be used for load frequency control.

Which of the above statements is/are correct?
(a) 1 only.
(b) 1 and 2 only.
(c) 1, 3 and 4.
(d) 3 and 4 only.

45. In India, pumped storage power plant

(a) does not exist at all.
(b) exists is Rajasthan alone.
(c) exists in Kadampurai (TN).
(d) exists in Haryana.

46. The pumped storage scheme is employed to supply

(a) during the peak hours.
(b) during the off-peak hours.
(c) system base load.

47. In pumped storage scheme, the generator is also used as

(a) induction generator or synchronous condenser.
(b) induction generator or synchronous motor.
(c) synchronous generator or induction generator.
(d) synchronous motor or synchronous condenser.

48. Pump storage schemes are used to improve

(a) the power factor.
(b) the diversity factor.
(c) the load factor.
(d) the quality of voltage.
(e) the reactive power capacity.
(f) the plant capacity factor as well as the load factor of the power system.

49. A hydro power plant of run-off-river type should be provided with pondage so that the

(a) firm capacity of the plant is increased.
(b) operating head is controlled.
(c) pressure inside the turbine casing remains constant.
(d) kinetic energy of the running water is fully utilized.

50. Bulb turbines are

(a) low head axial flow turbines.
(b) high speed turbines.
(c) high head turbines.
(d) high pressure turbines.

51. Bulb turbines

(a) can be used at very low and widely varying heads.
(b) are smaller, faster and easier to build than other types and are cheaper in capital cost than Kaplan turbines.
(c) are universally used for small hydro schemes.
(d) all of the above.

52. In turbulent flow

(a) cohesion is more effective than momentum transfer in causing shear stress.
(b) shear stresses arc usually larger than those in laminar flow.
(c) the fluid particles move in an orderly manner.
(d) momentum transfer is on molecular scale only.

53. Rotameter is used for measuring

(a) fluid discharge.
(b) fluid density.
(c) fluid viscosity.
(d) all of the above.

54. A steam power station needs space

(a) less than that required by the diesel power station of the same output.
(b) less than that required by atomic power station of the same output.

(c) less than that required by hydropower station of the same capacity.
(d) less than that required by a gas turbine power station of the same output.

55. Consider the following statements concerning steam power plants:

1. Maintenance and operating costs are low.
2. Water is required in huge quantity.
3. Requires long time for starting.
4. Handling of coal and disposal of ash can be done easily.

Which of the above statements is/are correct?
(a) 1 only.
(b) 2 and 3.
(c) 3 only.
(d) 3 and 4.

56. Operating cost of steam power station is

(a) less than that of nuclear power plants.
(b) less than that of diesel/gas turbine power plants.
(c) less than that of hydroelectric power plants.
(d) is the same as that of nuclear power plant.

57. The public sector unit associated with the manufacturing of steam power plant equipment in India is

(a) Bharat Heavy Electricals Ltd.
(b) N.T.P.C.
(c) Heavy Engineering Corporation.
(d) Neyveli Lignite Corporation.

58. Public sector undertaking associated with erection and commissioning of steam power plants in India is

(a) Indian Electricity Authority.
(b) National Thermal Power Corporation Ltd.
(c) Bharat Coking Coal Ltd.
(d) Coal India Ltd.

59. On which one of the following cycles does a modern steam power plant work?

(a) Carnet cycle
(b) Rankine cycle
(c) Otto cycle
(d) Bell-Coleman cycle

60. Rankine cycle efficiency of a steam power plant is in the range of

(a) 20 – 30%.
(b) 30 – 45%.
(c) 45 – 60%.
(d) 60 – 80%.