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Multiple Choice Question (MCQ) of Electric Power page-8


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71. In closed cooling system

A) water does not flow
B) hot water is recirculated after cooling
C) air and water cooling is simultaneously used
D) constant supply of fresh water for cooling is required.

Ans : (B)

72. A gas turbine works on

A) Rankine cycle
B) Dual cycle
C) Brayton cycle
D) Carnot cycle.

Ans : (C)

73. Particles having the same atomic number but different mass numbers are called

A) Decayed particles
B) Isotopes
C) Beta particles
D) Positrons.

Ans : (B)

74. During a disturbance on synchronous machine, the rotor swings from A to B before finally settling down to a steady-state at point C on the power angle curve. The speed of the machine during oscillation is synchronous at point (s)

A) A and B
B) A and C
C) B and C
D) Only at C.

Ans : (A)

75. In turbulent flow

A) the fluid particles move in orderly manner
B) momentum transfer is on molecular scale only
C) cohesion is more effective than momentum transfer in causing shear stress
D) shear stresses are generally larger than in laminar flow.

Ans : (D)

76. A Kaplan turbine is

A) low head axial flow turbine
B) an reaction turbine, outward flow type
C) an impulse turbine, inward flow type
D) a high head mixed flow turbine.

Ans : (A)

77. A Francis turbine is

A) Outward flow impulse turbine
B) Outward flow reaction turbine
C) Inward flow impulse turbine
D) Inward flow reaction turbine.

Ans : (D)

78. A 50 Hz, 4 pole turbo alternator rated at 20 MVA, 13.2 KV has an inertia constant H = 4 kW sec/KVA. The K.E stored in the rotor in the rotor at synchronous speed is

A) 20 MJ
B) 40 MJ
C) 80 MJ
D) 80 kJ.

Ans : (C)

79. Major constituent of methane gas is

A) Hydrogen
B) Oxygen
C) Methane
D) CO.

Ans : (C)

80. The average life of neutrons after they decay is

A) 1000 sec
B) 100 sec
C) 10 sec
D) 1 sec.

Ans : (B)


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