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UNIVERSITY COLLEGE OF ENGINEERING Time : 30 Minutes

SESSIONAL QUIZ Max Marks: 40

1.

A Hartnell governor is a

(a)Pendulum type governor (b) Spring loaded governor

(c) Dead Weight Governor (d) Inertia governor

2.

Which of the following is used to drive a gramophone ?

(a) Watt governor (b) Porter governor

(c) Pickering Governor (d) Hartnell governor

3. A hunting governor is

(a) more stable (b) less sensitive (c) more sensitive (d) none of these

4. Which of the following is a spring controlled governor ?

(a) Hartnell (b) Hartung (c) Pickering (d) all of these

5. The sensitiveness of the governor is given by

(a)

(b)() (c) ( )(d) none of these

6. A governor is said to be hunting , if the speed of the engine

(a) remains constant at the mean speed

(b) is above the mean speed

(c) is below the mean speed

(d) fluctuates continuously above and below the mean speed

7. The ratio of the height of a Porter governor (when the length of arms and links are

equal ) to the height of a watts governor is

(a) m/M+m (b) M/m+M (c) m+M/m (d) m+M/M

Where m = Mass of the ball, and

M = Mass of load on the sleeve

8.

A disc spinning on its axis at 20 rad/s will undergo precision when a torque 100N-m

is applied about an axis normal to it at an angular speed , if mass moment of inertia of

the disc is the 1 kg-m2

(a) 2 rad/s (b) 5 rad/s (c) 10 rad/s (d) 20 rad/s

9.

The engine of an aeroplane rotates in clockwise direction when seen from the tail end

and the aeroplane takes a turn to the left. The effect of the gyroscopic couple on the

aeroplane will be

(a) to raise the nose and dip the tail (b) to dip the nose and raise the tail

(c) to raise the nose and tail (d) to dip the nose and tail

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10.The air-screw of an aeroplane is rotating clockwise when looking from the front . If it

makes a left turn, the gyroscopic effect will

(a) tend to depress the nose and raise the tail

(b) tend to raise the nose and depress the tail

(c) tilt the aeroplane

(d) none of the above

11.

The rotor of a ship rotates in clockwise direction when viewed from the stern and theship take a left turn. The effect of the gyroscopic couple acting on it will be

(a) to raise the bow and stern (b) to lower the bow and stern

(c) to raise the bow and lower the stern (d) to lower the bow and raise the stern

12.When the pitching of a ship is upward, the effect of gyroscopic couple acting on it

will be

(a) to move the ship towards port side (b) to move the ship towards star board

(c) to raise the bow and lower the stern (d to raise the stern and lower the bow

13.

In an automobile, if a vehicle makes a left turn , the gyroscopic torque

(a) increases the force on outer wheels (b) decreases the force on outer wheels

(c) does not effect the forces on outer wheels (d) none of these

14.The maximum fluctuation if the energy is the

(a) sum of the maximum and minimum energies

(b) difference between the maximum and minimum energies

(c) ratio of the maximum and minimum energy

(d) ratio of the mean resisting torque to the work done per cycle

15.In a turning moment diagram , the variations of energy above and below the mean

resisting torque line is called

(a) fluctuation of energy

(b) maximum fluctuation of energy

(c) coefficient of fluctuation of energy


16.

The ratio of the maximum fluctuation of speed to the mean speed is called

(a) fluctuation of speed (b) maximum fluctuation of speed(c) coefficient of fluctuation of speed (d) none of speed

17.

The two parallel and coplanar shafts are connected by gears having teeth parallel to

the axis of the shaft. The arrangement is called _________________

18.

The type of gears used to connect two non -parallel nonintersecting shafts are

____________________________

19.

The size of the gear is usually specified by ___________________________

20.

The product of the diametrical pitch and circular pitch is equal to ______________

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21.The radial distance of a tooth from the pitch circle to the bottom of the circle is called

________________________

22.The condition of correct gearing is

(a) the pitch line velocities of teeth be same

(b) radius of curvatures of two profiles be same

(c) common normal to the pitch surface cuts the line of centres at a fixed point.


23.Involute profile is preferred to cycloidal because

(a) the profile is easy to cut

(b) only one curve is required to cut

(c) the rack has straight line profile and hence can be cut accurately


24.

Interference can be avoided in involute gears with 20 pressure angle by

(a) cutting involute correctly

(b) using as small number of teeth as possible

(c) using more than 20 teeth

(d) using more than 8 teeth

25.Mitres gears are used for

(a) great speed reduction (b) equal speed

(c) minimum axial thrust (d) minimum blacklash

26.

In a gear train , when the axis of the shafts , over which the gears are mounted, move

relative to a fixed axis is called(a) simple gear train (b) compound gear train

(c) reverted gear train (d) epicyclic gear train

27.A differential gear of an automobile is a

(a) simple gear train (b) epicyclic gear train

(c) compound gear tain (d) none of these

28.

In a clock mechanism, the gear train used to connect minute hand to hour hand is

(a) epicyclic gear train (b) reverted gear train(c) compound gear train (d) simple gear train

29.

The train value of a gear train is

(a) equal to V.R of gear train (b) reciprocal of V.R of gear train

(c) always greater than unity (d) always less than unity

30.

In a simple gear train , if the number of idle gears is odd then the motion of driven

gear will

(a) be as same as that of driving gear

(b) be opposite to that of driving gear

(c) depend on the number of teeth on the driven gear

(d) none of these

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31.When the crank is at inner dead center, in a horizontal reciprocating steam engine, the

the velocity of the piston will be

(a) zero (b) minimum (c) maximum (d) none of these

32.In an engine , the work done by inertia forces in a cycle is

(a) positive (b) zero (c) negative (d) none of these

33.

Secondary forces in reciprocating mass on engine frame are(a) of same frequency as of primary forces

(b) twice the frequency as of primary forces

(c) four times the frequency as of primary forces


34.The swaying couple is due to the

(a) primary unbalanced forces (b) secondary unbalanced forces

(c) two cylinders of locomotive (d) partial balancing

35.

In a locomotive the maximum magnitude of the unbalanced force along the

perpendicular to the line of stroke is known as _______________________

36.The effect of hammer blow in a locomotive can be reduced by

(a) decreasing the speed

(b) using two or three pair of wheels coupled together

(c) balancing whole of the reciprocating parts

(d) both (a) and (b)

37.

The balancing of rotating and reciprocating parts of an engine is necessary when itruns at

(a) slow speed (b) medium speed (c) high speed (d) none of these

38.For static balancing of a shaft

(a) the net dynamic force acting on the shaft is equal to zero

(b) the net couple due to the dynamic forces acting on the shaft is equal to zero

(c) both (a) and (b)

(d) none of these

39.

For dynamic balancing of a shaft

(a) the net dynamic force acting on the shaft is equal to zero

(b) the net couple due to the dynamic forces acting on the shaft is equal to zero


(d) none of these

40.

In order to have complete balance of the several revolving masses in different planes

(a) the resultant force must be zero

(b) the resultant couple must be zero


(d) none of these

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