# Theory of Machines - 1 Test Questions - Set 2

1)   Trifilar suspension system is used to determine mass moment of inertia of

a. disc
b. flywheel
c. both a. and b.
d. none of the above
 Answer  Explanation  Related Ques ANSWER: both a. and b. Explanation: No explanation is available for this question!

2)   The difference between which two factors denotes the correction couple?

a. Difference between force required to accelerate non dynamically equivalent system and dynamically equivalent system
b. Difference between torque required to accelerate non dynamically equivalent system and dynamically equivalent system
c. Difference between torque required to decelerate dynamically equivalent system and non dynamically equivalent system
d. none of the above
 Answer  Explanation  Related Ques ANSWER: Difference between torque required to accelerate non dynamically equivalent system and dynamically equivalent system Explanation: No explanation is available for this question!

3)   Which formula is used to calculate correction couple?

a. Tc = ml1 (l3 - l2) α
b. Tc = ml1 (l3 - l2) α2
c. Tc = ml1 (l3 + l2) α
d. none of the above
 Answer  Explanation  Related Ques ANSWER: Tc = ml1 (l3 - l2) α Explanation: No explanation is available for this question!

4)   On which factors does law of friction depend?

a. Nature of material
b. Area of contact between surfaces
c. Velocity of sliding
d. All of the above
 Answer  Explanation  Related Ques ANSWER: Nature of material Explanation: No explanation is available for this question!

5)   What are crank effort diagrams?

a. Turning moment diagram is drawn on cartesian co-ordinates
b. Turning moment diagram is drawn on polar co-ordinates
c. Turning moment (T) is plotted against crank angle θ for various crank positions
d. All of the above
 Answer  Explanation  Related Ques ANSWER: Turning moment (T) is plotted against crank angle θ for various crank positions Explanation: No explanation is available for this question!

6)   The internal and external diameter of a shaft are 300 mm and 500 mm respectively. Thrust pressure is 6 x 106 N/m2.Calculate the load on the shaft which is taken by 5 collars.

a. 3769.911 N
b. 15079.644 kN
c. 3769.911 kN
d. 15079.644 N
 Answer  Explanation  Related Ques ANSWER: 3769.911 kN Explanation: No explanation is available for this question!

7)   Which of the following statements is/are true?

a. Friction clutches give positive engagement
b. Square shaped jaws in jaw clutch are driven in one direction
c. Spiral shaped jaws in jaw clutch are driven in one direction
d. All the above statements are true
 Answer  Explanation  Related Ques ANSWER: Spiral shaped jaws in jaw clutch are driven in one direction Explanation: No explanation is available for this question!

8)   Which clutch is known as wet clutch?

a. Single plate clutch
b. multi plate clutch
c. both a. and b.
d. none of the above
 Answer  Explanation  Related Ques ANSWER: multi plate clutch Explanation: No explanation is available for this question!

9)   In centrifugal clutches, when is the contact between shoe friction lining and surface of drum observed?

a. When centrifugal force is less than spring force
b. When centrifugal force is equal to spring force
c. When centrifugal force is greater than spring force
d. None of the above
 Answer  Explanation  Related Ques ANSWER: When centrifugal force is equal to spring force Explanation: No explanation is available for this question!

10)   Calculate torque transmitted by the clutch having four shoes, which has spring force of 700 N and centrifugal force of 4000 N. Rim diameter is 560 mm and coefficient of friction is 0.3

a. 1100 N
b. 1000 N
c. 1579 N
d. 1108.8 N
 Answer  Explanation  Related Ques ANSWER: 1108.8 N Explanation: No explanation is available for this question!

11)   If brakes are applied on front wheels of a car and if it moves on a level road, then retardation of the car is calculated using the formula

a. μ g
b. [μ g (l-x)] / (l + μ h)
c. (μ g x) / (l- μ h)
d. none of the above
 Answer  Explanation  Related Ques ANSWER: (μ g x) / (l- μ h) Explanation: No explanation is available for this question!

12)   Determine the power transmitted if dead weight on brake is 70 kg and engine has a speed of 300 rpm. One end of the rope has a diameter of 0.05 m is attached to a spring balance which has reading of 150 N, diameter of drum is 1 m.

a. 8.851 kW
b. 8.851 W
c. 1319.46 W
d. none of the above
 Answer  Explanation  Related Ques ANSWER: 8.851 kW Explanation: No explanation is available for this question!

13)   Which parameters can be measured using a dynamometer?

a. Force
b. Torque
c. Power
d. All of the above
 Answer  Explanation  Related Ques ANSWER: All of the above Explanation: No explanation is available for this question!

14)   Identify the type of absorption dynamometer ?

a. Epicyclic dynamometer
b. Prony brake dynamometer
c. Torsion dynamometer
d. Tatham dynamometer
 Answer  Explanation  Related Ques ANSWER: Prony brake dynamometer Explanation: No explanation is available for this question!

15)   Which of the following statements is/are false?

a. To prevent heat generated due to friction, rope brake dynamometers are provided with cooling water
b. Angle of twist upto 1/10 of degree can be measured by Glibson flash light torsion dynamometer
c. In pneumatic brakes, the ratio between hydraulic pressure and air pressure is 15:1
d. All the above statements are false
 Answer  Explanation  Related Ques ANSWER: Angle of twist upto 1/10 of degree can be measured by Glibson flash light torsion dynamometer Explanation: No explanation is available for this question!

16)   In a Hooke's joint, maximum velocity ratio between driving and driven shaft is possible if θ is

a. 0
b. π
c. 2 π
d. all of the above
 Answer  Explanation  Related Ques ANSWER: all of the above Explanation: No explanation is available for this question!

17)   Which relation is used to denote condition for equal speeds, when driving and driven shafts are connected by Hook's joint?

a. tan θ = ± √cos α
b. tan θ = ± √cot α
c. tan θ = ± √sin α
d. cot θ = ± √cos α
 Answer  Explanation  Related Ques ANSWER: tan θ = ± √cos α Explanation: No explanation is available for this question!

18)   Which among the following is the condition for maximum acceleration in Hooke's joint?

a. cos 2 θ ≈ (2 sin2 α / 2 + sin2 α)
b. cos θ ≈ (2 sin2 α / 2 - sin2 α)
c. cos 2 θ ≈ (2 sin2 α / 2 - sin2 α)
d. cos 2 θ ≈ (sin2 α / 2 - sin2 α)
 Answer  Explanation  Related Ques ANSWER: cos 2 θ ≈ (2 sin2 α / 2 - sin2 α) Explanation: No explanation is available for this question!

19)   Calculate the angular speed of driven shaft if the driving shaft has angular speed of 400 rpm. When shaft angle is 20o and angle of rotation is 40o in Hooke's joint.

d. None of the above

20)   Calculate the angle of driving shaft, if the two shafts of the Hooke's joint are inclined at an angle of 18.50o

a. 45.56o
b. 37.70o
c. 39.17o
d. 41.95o
 Answer  Explanation  Related Ques ANSWER: 41.95o Explanation: No explanation is available for this question!

21)   The relation between number of links and number of lower pairs is given as n = 2p – 4. If L.H.S is less than R.H.S of this equation then the chain is

a. constrained
b. locked
c. structure
d. unconstrained
 Answer  Explanation  Related Ques ANSWER: unconstrained Explanation: No explanation is available for this question!

22)   One quaternary joint is equal to how many binary joints?

a. 4
b. 3
c. 2
d. none of the above
 Answer  Explanation  Related Ques ANSWER: 3 Explanation: No explanation is available for this question!

23)   Which type of mechanism is shown below?

a. constrained
b. unconstrained
c. locked
d. none of the above
 Answer  Explanation  Related Ques ANSWER: unconstrained Explanation: No explanation is available for this question!

24)   Watt's mechanism is based on

a. inversions of single slider chain mechanism
b. inversions of double slider chain mechanism
c. inversions of four bar chain mechanism
d. inversions of five bar chain mechanism
 Answer  Explanation  Related Ques ANSWER: inversions of four bar chain mechanism Explanation: No explanation is available for this question!

25)   Scotch yoke mechanism is the inversion of

a. Single slider kinematic chain
b. Double slider kinematic chain
c. Four bar chain
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Double slider kinematic chain Explanation: No explanation is available for this question!

26)   Calculate torque acting on the crank, if tangential force acting on the engine is 150 kN and 300 mm is the crank radius.

a. 45 kN.m
b. 500 kN/m
c. 2 kN/m
d. none of the above
 Answer  Explanation  Related Ques ANSWER: 45 kN.m Explanation: No explanation is available for this question!

27)   Calculate the thrust in connecting rod, if piston effort is 200 kN and crank makes an angle of 45o from TDC. Assume obliquity ratio = 3.5

a. 900.80 kN
b. 204.20 kN
c. 195.87 kN
d. 970.02 kN
 Answer  Explanation  Related Ques ANSWER: 204.20 kN Explanation: No explanation is available for this question!

28)   Match the following Group 1 items with Group 2 items

1. Piston effort (FP) ----------------------------------- A. FQ sin (θ + Φ)
2. Thrust in connecting rod (FQ)  ------------------- B. FQ cos (θ + Φ)
3. Tangential force on crank shaft (FT) ------------ C. Fg – F1 + FF + WR
4. Radial force along crank shaft (FR) ------------- D. FP / cos Φ

a. 1 – A, 2 – C, 3 – D, 4 – B
b. 1 – B, 2 – D, 3 – C, 4 – A
c. 1 – C, 2 – D, 3 – A, 4 – B
d. 1 – B, 2 – A, 3 – D, 4 – C
 Answer  Explanation  Related Ques ANSWER: 1 – C, 2 – D, 3 – A, 4 – B Explanation: No explanation is available for this question!

29)   Which of the following conditions should be satisfied for a two point mass statistically equivalent system?

1. m = m1 + m2
2. m1 l2 = m2 l1
3. m1 l1 = m2  l2
4. IG = IG1 + IG2

a. Condition 1 and condition 2
b. Condition 1 and condition 3
c. Condition 2 and condition 4
d. All the above conditions should be satisfied
 Answer  Explanation  Related Ques ANSWER: Condition 1 and condition 3 Explanation: No explanation is available for this question!

30)   Torsional pendulum is used to determine mass moment of inertia of

a. flywheel
b. rigid bar
c. both a. and b.
d. none of the above
 Answer  Explanation  Related Ques ANSWER: flywheel Explanation: No explanation is available for this question!