Theory Of Machine Questions MCQs

Total Questions : 2172

Page 1 of 109 pages
Question 1. When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.
  1.     Smaller
  2.     Larger
  3.     Either A or B
  4.     None of these
Answer: Option A
Question 2. When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to
  1.     Zero
  2.     One
  3.     π/2
  4.     π
Answer: Option B
Question 3. In a flat collar pivot bearing, the moment due to friction is proportional to
  1.     (r₁² - r₂²)/(r₁ - r₂)
  2.     (r₁² - r₂²)/(r₁ + r₂)
  3.     (r₁³ - r₂³)/(r₁² - r₂²)
  4.     (r₁³ - r₂³)/(r₁ - r₂)
Answer: Option C
Question 4. In a simple harmonic motion, the velocity vector with respect to displacement vector
  1.     Is in phase
  2.     Leads by 90°
  3.     Leads by 180°
  4.     Lags by 90°
Answer: Option D
Question 5. Which of the following is a pendulum type governor?
  1.     Watt governor
  2.     Porter governor
  3.     Hartnell governor
  4.     None of these
Answer: Option A
Question 6. In a multiple v-belt drive, if one of the belts is broken, then we should replace
  1.     The broken belt only
  2.     All the belts
  3.     The broken belt and the belts on either side of it
  4.     None of the above
Answer: Option B
Question 7. A chain comprises of 5 links having 5 joints. is it kinematic chain?
  1.     Yes
  2.     No
  3.     It is a marginal case
  4.     Data are insufficient to determine it
Answer: Option B
Question 8. The kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)
  1.     n = 3(l - 1) - 2j - h
  2.     n = 2(l - 1) - 2j - h
  3.     n = 3(l - 1) - 3j - h
  4.     n = 2(l - 1) - 3j - h
Answer: Option A
Question 9. A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)
  1.     m₁ r₂ = m₂ r₁
  2.     m₁ r₁ = m₂ r₂
  3.     m₁ m₂ = r₁ r₂
  4.     None of these
Answer: Option B
Question 10. The direction of linear velocity of any point on a link with respect to another point on the same link is
  1.     Parallel to the link joining the points
  2.     Perpendicular to the link joining the points
  3.     At 45° to the link joining the points
  4.     None of the above
Answer: Option B
Question 11. Abcd is a four bar mechanism in which ab = 310 mm and cd = 450 mm. ab and cd are both perpendicular to the fixed link ad, as shown in the below figure. if the velocity of b at this condition is v. then the velocity of c is
  1.     (1/3). v
  2.     (2/3). v
  3.     (3/2). v
  4.     (9/4). v
Answer: Option C
Explanation :
Question 12. Bifilar suspension method is used to find the
  1.     Angular acceleration of the body
  2.     Moment of inertia of the body
  3.     Periodic time of the body
  4.     Frequency of vibration of the body
Answer: Option B
Question 13. The lead screw of a lathe with nut forms a
  1.     Rolling pair
  2.     Sliding pair
  3.     Screw pair
  4.     Turning pair
Answer: Option C
Question 14. For a twin cylinder v-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. the engine is a
  1.     30° V-engine
  2.     60° V-engine
  3.     120° V-engine
  4.     150° V-engine
Answer: Option A
Explanation :
Question 15. The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at
  1.     The center of the disc
  2.     The point of contact
  3.     An infinite distance on the plane surface
  4.     The point on the circumference situated vertically opposite to the contact point
Answer: Option B
Question 16. In a reciprocating steam engine, which of the following forms a kinematic link?
  1.     Cylinder and piston
  2.     Piston rod and connecting rod
  3.     Crankshaft and flywheel
  4.     Flywheel and engine frame
Answer: Option C
Question 17. A torsional system with discs of moment of inertia i₁ and i₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft b to shaft a is 'g'. neglecting the inertia of gears, the equivalent inertia of disc on shaft b at the speed of shaft a is equal to
  1.     G.I₂
  2.     G².I₂
  3.     I₂/G
  4.     I₂/G²
Answer: Option B
Explanation :
Question 18. The mechanism in which two are turning pairs and two are sliding pairs, is called a
  1.     Double slider crank chain
  2.     Elliptical trammel
  3.     Scotch yoke mechanism
  4.     All of these
Answer: Option D
Question 19. Frequency of vibrations is usually expressed in
  1.     Number of cycles per hour
  2.     Number of cycles per minute
  3.     Number of cycles per second
  4.     None of these
Answer: Option C
Question 20. A slider crank chain consists of following numbers of turning and sliding pairs
  1.     1, 3
  2.     2, 2
  3.     3, 1
  4.     4, 0
Answer: Option C