Previous Years GATE Questions on Mechanism 2005-2007

Solve GATE Questions on Mechanism

Common Data for Question 1, 2, and 3 :

An instantaneous configuration of a four bar mechanism, whose plane is horizontal, is shown in the figure below. At this instant, the angular velocity and angular acceleration of link  are  and , respectively, and the driving torque  is zero. The link  is balanced so that its centre of mass falls at .

Question 1. Which kind of four bar mechanism is ?

(A) Double-crank mechanism

(B) Crank-rocker mechanism

(C) Double- rocker mechanism

(D) Parallelogram mechanism

GATE-ME-2005

Hint

Question 2. At the instant considered, what is the magnitude of the angular velocity of ?

(A) 1 rad/sec

(B) 3 rad/sec

(C) 8 rad/sec

(D) 64/3 rad/sec

GATE-ME-2005

Hint

Question 3. At the same instant, if the component of the force at joint A along AB is 30 N, then the magnitude of the joint reaction at .

(A) is Zero

(B) is 30 N

(C) is 78 N

(D) Cannot be determined from the given data.

GATE-ME-2005

Hint

Question 4. The number of degrees of freedom of a planar linkage with 8 links and 9 simple revolute joints is

(A) 1

(B) 2

(C) 3

(D) 4

GATE-ME-2005

Hint

Question 5. In a four-bar linkage, S denotes the shortest link length, L is the longest link length, P and Q are the lengths of other two links. At least one of the three moving links will rotate by 360° if

(A)

(B)

(C) 

(D) 

GATE-ME-2006

Hint

Question 6. Match the items in columns I and II

 

(A) P-2    Q-6         R-4         S-3

(B) P-6    Q-2         R-4         S-1

(C) P-6    Q-2         R-5         S-3

(D) P-2    Q-6         R-5         S-1

GATE-ME-2006

Hint

Question 7. The number of inversions for a slider crank mechanism is

(A) 6

(B) 5

(C) 4

(D)3

GATE-ME-2006

Hint

Question 8. For a four bar linkage in toggle position, the value of mechanical advantage is :

(A) 0.0

(B) 0.5

(C) 1.0

(D) 

GATE-ME-2006

Hint

Linked Answer Questions : Q.21-Q.22 carry two marks each

A quick return mechanism is shown below. The crank OS is driven at 2 rev/s in counter-clockwise direction.

Question 9. If the quick return ratio is 1:2, then the length of the crank in mm is

(A) 250

(B) 250

(C) 500

(D) 

GATE-ME-2007

Hint

Question 10. The angular speed of PQ in rev/s when the block R attains maximum speed during forward stroke (stroke with slower speed) is

(A) 1/3

(B) 2/3

(C) 2

(D) 3

GATE-ME-2007

Hint

Question 11. The input link  of a four bar linkage is rotated at 2 rad/s in counter clockwise direction as shown below. The angular velocity of the coupler PQ in rad/s, at an instant when  is

(A) 4

(B) 2

(C) 1

(D) 1/

GATE-ME-2007

Hint

Answer Keys