Tuesday, October 28, 2014

Governor and Flywheels - Important objective type questions including IES exam questions

1. The function of a governor is to,
(a) smoothen the cyclic fluctuations of speed
(b) help to start the engine
(c) take care of output fluctuations and control the input accordingly
(d) store up energy and give up the same whenever required during a cycle

Answer: c

2. Identify the incorrect statement
(a) Watt Governor is a pendulum type centrifugal governor
(b) Porter governor is dead weight type centrifugal governor
(c) Hartnell Governor is a spring controlled centrifugal governor
(d) Pickering governor is an inertia governor

Answer: d

3. Which one of the following is a spring controlled centrifugal governor?
(a) Pickering governor
(b) Porter governor
(c) Proell governor
(d) Watt governor

Answer: a

4. A Hartnell governor is a governor of the
(a) dead weight type
(b) pendulum type
(c) inertia type
(d) centrifugal type

Answer: d

5. Centrifugal governors are preferred to the inertia type governors because an inertia governor
(a) has less controlling force
(b) is highly sensitive and more prone to hunting
(c) poses problems in the balancing of inertia forces
(d) has high initial and maintenance cost

Answer: c

6. Compared to gravity or dead weight controlled governors, the spring controlled type governors
1. are more compact and smaller in size
2. can operate at much higher speeds
3. have the capability to revolve about vertical or inclined axes
which of the statements made above are correct?
(a) 1 and 2 (b) 2 and 3 (c) 1 and 3 (d) 1,2 and 3

Answer: d

7. In a Hartnell governor, the mass of each ball is 2.5 kg. Maximum and minimum centrifugal forces on the balls are 2000 N and 200 N corresponding to radii 20 cm and 14 cm respectively. Lengths of vertical and horizontal arms of the bell crank lever are the same. Then what is the spring stiffness in N/cm ?
(a) 300 (b) 450 (c) 600 (d) 760

[This question was asked in Engineering Services Exam 2009]

 Answer: c


More questions will be added later...
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