https://www.geekmcq.com/

Engineering :: Hydraulics Machines


51.  The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.
A. Yes B. No

52.  The power produced by the reaction turbine is
A. directly proportional B. inversely proportional

53.  The speed ratio in case of Francis turbine varies from
A. 0.15 to 0.3 B. 0.4 to 0.5
C. 0.6 to 0.9 D. 1 to 15

54.  If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.
A. Agree B. Disagree

55.  The runaway speed of a hydraulic turbine is the speed
A. at full load B. at which there will be no damage to the runner
C. corresponding to maximum overload permissible D. at which the turbine will run freely without load

56.  The speed of a turbine runner is
A. directly proportional to H1/2 B. inversely proportional to H1/2
C. directly proportional to H3/2 D. inversely proportional to H3/2

57.  The discharge through a turbine is
A. directly proportional to H1/2 B. inversely proportional to H1/2
C. directly proportional to H3/2 D. inversely proportional to H3/2

58.  A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is
A. 0.25 kW B. 0.75 kW
C. 1.75 kW D. 3.75 kW

59.  In the above question, the unit speed of the wheel is
A. 10 r.p.m. B. 20 r.p.m.
C. 40 r.p.m. D. 80 r.p.m.

60.  The speed of an imaginary turbine, identical with the fiven turbine, which will develop a unit power under a unit head, is known as
A. normal speed B. unit speed
C. specific speed D. none of these




© 2012-2024 by GeekMCQ™ Technologies. All Rights Reserved | Copyright | Terms of Use & Privacy Policy

Contact us: info@geekmcq.com