Objective questions UNIT 1:

1. A disc is spinning with an angular velocity of ‘ω’ rad/sec about the axis of spin the couple applied to the disc causing precision will be _______(d)_______

(a)12

I ω 2 (b) I ω 2 (c) 12

I. ω. ωp (d) I. ω. ωp

2. An aero plane is travelling at 3000 km/h and it is negotiating a turn of 30 m radius. Its precessional angular velocity is _________________

3. A disk spinning about its axis at 20 rad/sec will undergo precession when a torque of 100 N-m is applied about an axis normal to it. Its angular velocity of precession is __(b)____ if moment of inertia of disc is 1Kg m2

(a) 2 rad/sec (b) 5 rad/sec (c) 10 rad/sec (d) 20 rad/sec4. The engine of an aero plane rotates in clockwise direction when seen from tail end and

the aero plane takes left turn Effect of gyroscopic couple on aero plane will be ___(a)______(a) To raise nose and dip tail (b) dip nose and raise tail(c ) raise nose and tail (d) dip nose and tail

5. The engine of an aero plane rotates in anti clockwise direction when seen from tail end and the aero plane takes left turn effect of gyroscopic couple on aero plane will be dip nose and raise tail

6. Engine of an aero plane rotates in clockwise direction when seen from front and aero plane makes left turn. Effect of gyroscopic couple on aero plane is dip nose and raise tail

7. Engine of an aero plane rotates in clockwise direction when seen from rear end and aero plane takes right turn, the effect of gyroscopic couple is _dip the nose raise the tail.

8. Engine of an aero plane rotates in clockwise direction when seen from front end and aero plane takes right turn, the effect of gyroscopic couple is Raise the nose dip the tail.

9. The rotor of ship rotates in clockwise direction when viewed from stern and ship takes a left turn. The effect of gyroscopic couple acting an it will be ___c_________(a) Raise bow and stern (b) lower bow and stern (c) raise bow and lower stern(d) lower bow and raise stern

10. When the pitching of a ship is upward, the effect of gyroscopic couple acting an it will be __B___(a) To move ship toward port (b) to move ship toward star board (c) to raise bow and

lower stern (d) to raise stern and lower bow11. The angular velocity of axis of spin is known as _______12. Angular motion of axis of spin about precessional axis is known as _precessional angular

velocity.13. For the gyroscopic couple to occur the angle between axis, of precession, axis of spin

and axis of gyroscopic couple should be ___90________

14. In which of the following cases there is a no gyroscopic effect __c______(a) Steering of a ship (b) pitching of a ship (c) Rolling of a ship (d) none

15. In rolling of a ship the gyroscopic couple is zero because the angle between axis of spin and axis of precession is ________0___

16. In pitching of a ship, if tp=time period of SHM Angular velocity of SHM (ω1) = __2π/tp__________

17. In pitching of a ship if =Amplitude of swing and tp= time period of SHM then maximum angular velocity of precession is φ ω1 = φ 2π/ t p

18. In pitching of a ship if = amplitude tp = time period the maximum angular acceleration is __φ (2π/tp)2.________

19. In an automobile if vehicle makes left turn, the gyroscopic torque (a)(a) Increase force on outer wheels (b) decrease force on outer wheels (c) none

20. Angle made by a 2 wheeler wheel with vertical, when it is taking a turn is known as _Angle of heel_________

21. A motor car moving at a certain speed takes left turn, then due to centrifugal force (b)(a) Reaction on inner wheel increases and outer wheels decrease (b) reaction on outer

wheel increase and inner wheel decrease (c) reaction on both wheels increase (d) none

Objective questions UNIT 2:

1. Constraint forces at a mechanical contact occurs in ..pairs (T/F) Ans: T2. Constraint forces have net effect in system of bodies (T/F) Ans: F3. Equations of static equilibrium are Ans: ∑F=0, ∑T=04. A member under the action of two forces will be in equilibrium if Ans: d

Condition 1. Forces are of same magnitude 2. Forces act along same line3. Forces are in opposite direction

a) Only condition (1) is True b) Only condition (2) is Falsec) All conditions True d) All conditions False

5. In static force analysis inertia effects are small and can be neglected (T/F) Ans: T6. In dynamic force analysis inertia effects due to mass of the components is considered (T/F)

Ans: T7. Sketch of a part isolated from mechanism in order to determine nature of forces acting on it is

known as __________ Ans: Free body diagram8. In a linear system of mechanism, the coulomb or dry friction is neglected (T/F) Ans: T9. If m = Mass of Body, a = acceleration of centre of mass of body the Inertial force = ______10. According to D’Alembert’s principle, vector sum of forces is Zero. (T/F) Ans: T

Objective questions UNIT 3:

1) The relative pole of a moving link is its centre of rotation relative to a___b_____ link.(a) Fixed link (b) Moving link (c) any link

2) Freudenstein’s equation is written in the following form (a)(a) K1cos + K2cos +K3-cos (-)=0(b) K1cos + K2cos +K3+cos (-) =1(c) K1cos + K2cos +K3-cos (-) =1(d) None

3) Function generation means designing a mechanism in which ___a_______ are related by a function.

(a) Output and input links (b) Input and coupler links (c) output and coupler links (e) None

4) The difference between the function prescribed path and the function produced path by the designed linkage is known as ____structural error__

5) In 3 position synthesis the number of relative poles are _ (c )________(a) One (b) three (c) two (d) none of these

6) In Freudensteins equation the value of K1 & K2 in terms of the lengths of links a,b,c,d are (a)(a) d/a , -d/c (b) –d/c , d/a (c) –d/a , d/c (d) -d/a , -d/c

7) Chebychev spacing of precision points are used to _minimize_ structural error (c )(a) Maximize (b) constant (c) minimize (d) none

(b) Objective questions UNIT 4: 1. Brakes commonly used in railway trams is __a____

(a) Shoe brake (b) band brake (c) band & block brake (d) Internal expanding shoe brake

2. Brakes commonly used in motor cars is _______d__(a) Shoe Brake (b) band brake (c) band & block brake (d) Internal expanding shoe

brake3. If w= width of shoe and r =brake drum radius, ‘2’ angle subtended by shoe at centre the ,

RN normal reaction i. Area of projection = ----b*2rsinθ----------ii. Bearing pressure on shoe is _ω/(b2rsinθ).______

4. In block brakes if 2> 600then µ´= ____________5. In a block brake, if Ft is tangential effort and r= drum radius, then frictional torque is

__Ft* r_______

6. In a double block brake ft1, ft2, are tangential effort at each of brakes, r=drum radius, then frictional torque is __b___

(a) Ft1-Ft2) r (b) ft1+ft2) r (c)

ft1ft 2xr

(d) Ft1. Ft2 . r7. In a band brake if one of the bands is attached directly to pivot then such a band brake is

known as _simple band brake__8. In a band brake if none of the bands are directly attached to fulcrum then the band brake is

known as _Differential band brake_9. If T1, T2 are tension on tight & slack side = Angle of embrace then relation between T1,

T2 , µand is _T1/ T2 = eμθ__ 10. In a band brake if σ is allowable tensile stress is band w=width of band t= thickness of band

and T1, T2 are tensions on tight and slack sides then (a)(a) T1= wt (b) T2 = wt (c) (T1-T2)=wt (d) none

11. In band brake if T1, T2 are tensions on tight and slack side r=brake drum radius then torque is __(c)____

(a) T1.r (b) T2.r (c) (T1-T2) r (d)

T1

T2

. r

12. In a band and block brake if n=no. of brakes µ = coeff. Of friction 2=Angle subtended by block at centre, then formula for ratio of tension on tight & slack sides is _T1/T2=(1+μtanθ/1-μtanθ)n___

13. In internal expanding shoe brake for anti clockwise rotation of drum (i) Left hand side shoe is known as _leading shoe___(ii) Right hand side shoe is known as _Trailing shoe____

14. In internal expanding shoe brake for clock wise rotation of drum ____(i) Left hand side shoe is known as _Trailing shoe___(ii) Right hand side shoe is known as _Leading shoe____

15. Which of the following is absorption dynamometer ( b)(a) Epicyclic (b) Rope brake (c) Gibbs flash light (d) none

16. Which of the following is transmission dynamometer ( a) (a) Epicyclic (b)Rope brake (c) Proney brake (d) None

17. Torsional dynamometer is ___(b)____(a) Absorption type (b) Transmission type (c) both (d) none

18. In proney brake if w= load attached to hanger and ‘L’ is distance between hanger and centre ofdrum, then torque is __W * L______

19. In rope brake dynamometer W=load S=spring balance reading D=dia and drum d= dia of rope N= Speed in r/m Brake power is _(w-s)π(D+d)N/60______

20. In Epicyclic train dynamometer if w= load attached to hanger L= distance between load and pivoting point of lever a = distance between centre of pinion and pivoting point, torque transmitted = __WL/2a *R___ R= pitch circle radius of gear.

21. In belt transmission type dynamometer T1, T2 tensions on tight & slack sides w= load attached L= distance between load and pivoting point of frame a= distance between centre of loose pulley and pivoting point

(i) T1 – T2 = ___W* L /2a____(ii) Brake power = __(W*L/2a )(πDN/60)__

22. In torsional dynamometer T=K. where ‘k’ is a constant the formula for ‘k’ is __cj/l________

23. Frictional torque transmitted by disc or plate clutch is same as that of __b_____(a) Flat pivot bearing (b) flat collar bearing (c) Conical pivot bearing (d) Trapezoidal

pivot bearing24. Frictional torque transmitted by cone clutch is same as that of --------c--------------

(a) Flat pivot bearing (b) flat collar bearing (c) Conical pivot bearing (d) Trapezoidal pivot bearing

25. In a multiple disc clutch if n1=no. of discs on driving shaft n2 = no. of discs on driven shaft number of pairs of contact surface=n= ---n1 + n2 -1--------

26. In a multiple disc clutch if r1,r2 radii of friction surfaces =co.eff. Of friction n=no. of pairs of contact surfaces, then W= axial load Frictional torque under uniform pressure is ________ . Frictional torque under uniform wear is __________

27. In frictional clutches which of following theory is preferred (b)(a) Uniform pressure(b) uniform wear (c) both (d) none

28. In friction clutches if r1, r2 ratio of friction surface W=axial load the constant for uniform wear theory C= _____

29. In a cone clutch the formula for frictional torque under uniform pressure condition is _________

30. In a cone clutch the formula for frictional torque under uniform wear condition is ________31. The clutch usually incorporated in motor pulley is __Centrifugal clutch___32. In centrifugal clutch if L=contact length of shoe b= width of shoe PS= Spring force PC=

Centrifugal force P= Pressure intensity on shoe then relation between PC,PS, L,B,P is _____33. When a large torque is to be transmitted then _Multi plate clutch_ clutch is used.34. _cone clutch_ clutch is extensively used in automobile.