# SSC JE [Mechanical] Previous Asked Questions From Theory of Machine

## SSC JE Previous Asked Questions of TOM

### Theory of Machines Syllabus for SSC JE [Mechanical]:

Concept of simple machine,
Flywheels and fluctuation of energy,
Gears – Type of gears, gear profile and gear ratio calculation, Governors – Principles and classification,
Cams

#### Previous Asked Questions in SSC JE from Theory Of Machine [TOM]:

(Red coloured Option indicates correct answer)

Mechanism:
1. IN A DOUBLE SLIDER CRANK CHAIN THE NUMBER OF REVOLUTE PAIRS ARE
A. 1
B. 2
C. 3
D. 4

2. OLDHAM COUPLING IS AN INVERSION OF
C. SINGLE SLIDER CRANK MECHANISM
D. DOUBLE SLIDER CRANK MECHANISM

3. A UNIVERSAL JOINT IS AN EXAMPLE OF
A. LOWER PAIR
B. HIGHER PAIR
C. ROLLING PAIR
D. SLIDING PAIR

4. INVERSION OF A MECHANISM IS
A. CHANGING OF A HIGHER PAIR INTO LOWER PAIR
B. OBTAINED BY FIXING DIFFERENT LINKS IN A KINEMATIC CHAIN
C. TURNING IT UPSIDE DOWN
D. OBTAINED BY REVERSING THE INPUT AND OUTPUT MOTION

5. FOR A SLIDER CRANK MECHANISM, THE VELOCITY AND ACCELERATION OF THE PISTON AT INNER DEAD CENTRE WILL BE
A. 0 AND 0
B. 0 AND w2r
C. 0 AND < w2r
D. 0 AND > w2r

6. CRANK, CONNECTING ROD, CYLINDER AND PISTON OF STEAM ENGINE CONSTITUTE

7. THE RELATION BETWEEN NUMBER OF PAIRS (P) AND NUMBER OF LINKS IN A KINEMATIC CHAIN IS GIVEN BY
A. L = 2P-4
B. L = 2P+4
C. L = 2P+1
D. L = 2P-2

8. THE CRANK RADIUS OF A SINGLE SLIDER CRANK MECHANISM IS 10 cm. IF THE CRANK RADIUS IS INCREASED TO 12 cm , THE STROKE LENGTH WILL INCREASE BY
A. 20 %
B. 12 %
C. 15 %
D. 10 %

9. A BALL AND SOCKET JOINT FORMS A
A. SLIDING PAIR
B. SPHERICAL PAIR
C. TURNING PAIR
D. ROLLING PAIR

10. DEGREE OF FREEDOM OF A SLIDER CRANK MECHANISM
A. 0
B. 1
C. 2
D. 3

11. THE DIFFERENTIAL GEAR IN THE AUTOMOBILES IS USED TO
A. ASSISTANT IN CHANGING SPEED
B. PROVIDE BALANCING
C. REDUCE SPEED
D. HELPS IN TURNING

12. A SLIDER CRANK MECHANISM IS A FOUR BAR LINKAGE CONSISTING OF
A. TWO TURNING PAIR AND TWO SLIDING PAIR
B. TWO TURNING PAIR AND THREE SLIDING PAIR
C. THREE TURNING PAIR AND ONE SLIDING PAIR
D. THREE SLIDING PAIR AND ONE TURNING PAIR

13. A POINT ON A LINK CONNECTING DOUBLE SLIDER CRANK CHAIN TRACES
A. STRAIGHT LINE PATH
B. CIRCULAR PATH
C. PARABOLIC PATH
D. ELLIPTICAL PATH

14. IN A KINEMATIC CHAIN THE MINIMUM NUMBER OF KINEMATIC PAIRS REQUIRED IS
A. ONE
B. TWO
C. THREE
D. FOUR

15. IF THE LENGTH OF THE LINKS IN A MECHANISM ARE GIVEN AS 5 , 9 , 10 , 8 THEN WHICH TYPE OF MECHANISM IT WOULD BE
A. SLIDER CRANK
B. DOUBLE CRANK
C. CRANK ROCKER
D. DOUBLE ROCKER

16. A SLIDER SLIDING AT 10 cm/s ON A LINK WHICH IS ROTATING AT 60 rpm , IS SUBJECTED TO CORIOLIS ACCELERATION OF MAGNITUDE , IN cm2/s
A. 62.8
B. 125.6
C. 31.4
D. 251.2

17. CRANKSHAFT TURNING IN A JOURNAL BEARING FORMS A
A. SLIDING PAIR
B. TURNING PAIR
C. ROLLING PAIR
D. HELICAL PAIR

18. THE CONTACT BETWEEN CAM AND FOLLOWER IS TO FORM
A. LOWER PAIR
B. HIGHER PAIR
C. SLIDING PAIR
D. ROLLING PAIR

19. WHICH OF THE FOLLOWING DOES NOT RELATE TO THE STEAM ENGINE
A. CRANKSHAFT
C. STEAM CHEST
D. STEAM SEPARATOR

Governor:
Q1. WHICH ONE OF THE FOLLOWING IS A GRAVITY CONTROLLED GOVERNOR?
A. HARTNELL GOVERNOR
B. HARTUNG GOVERNOR
C. WATT GOVERNOR
D. PICKERING GOVERNOR

Q2. HARTNELL GOVERNOR COULD BE CLASSIFIED UNDER THE HEAD OF
A. INERTIA TYPE
B. PENDULUM TYPE
C. CENTRIFUGAL TYPE

Q3. GOVERNOR IS USED IN AUTOMOBILES TO
A. DECREASE VARIATION OF SPEED
B. MAINTAIN MEAN SPEED
C. MAINTAIN MEAN SPEED BY VARYING FUEL SUPPLY
D. BOTH B AND C

Q4. THE HEIGHT OF A WATT AND PORTER GOVERNOR ARE RELATED AS
A. INVERSELY PROPORTIONAL TO ANGULAR SPEED
B. INVERSELY PROPORTIONAL TO SQUARE OF ANGULAR SPEED
C. DIRECTLY PROPORTIONAL TO ANGULAR SPEED
D. NONE OF ABOVE

Q5. IN A HARTNELL GOVERNOR 800 N FORCE IS EXERTED ON THE SLEEVE AT MINIMUM RADIUS AND 1200 N FORCE IS EXERTED AT MAXIMUM RADIUS. IF THE SLEEVE LIFT IS 20 mm , the VALUE OF STIFFNESS (N/mm)IS
A. 10
B. 20
C. 15
D. 18

Q6. THE ANGULAR SPEED OF WATT GOVERNOR WHEN ITS HEIGHT IS 20 cm , WILL BE EQUAL TO
A. 20
B. 10
C. 6
D. 7

Q7. WHEN SPEED OF A GOVERNOR INCREASES

Q8. WHEN SLEEVE OF A PORTER MOVES UPWARDS THE GOVERNOR SPEED
A. INCREASE
B. DECREASE
C. REMAINS UNAFFECTED
D. FIRST INCREASE THEN DECREASE

Q9. THE SENSITIVITY OF A ISOCHRONOUS GOVERNOR IS
A. ZERO
B. ONE
C. LESS THA. ZERO
D. INFINITY

Q10. IF THE STIFFNESS OF THE SPRING IN HARTNELL GOVERNOR INCREASES THEN SENSITIVITY WILL
A. INCREASE
B. DECREASE
C. FIRST INCREASE THEN DECREASE
D. FIRST DECREASE THEN INCREASE

Q11. WHICH OF THE FOLLOWING GOVERNOR CAN BE ISOCHRONOUS
A. WATT
B. PORTER
C. PICKERING
D. HARTNELL

Q12. THE HUNTING LEVEL OF AN ISOCHRONOUS GOVERNOR IS
A. ZERO
B. ONE
C. INFINITY
D. LESS THAN ZERO

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