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MCQs

Total Questions : 543 | Page 8 of 55 pages
Question 71. A pulley and belt in a belt drive form a
  1.    Cylindrical pair
  2.    Turning pair
  3.    Rolling pair
  4.    Sliding pair
 Discuss Question
Answer: Option C. -> Rolling pair
Question 72. Carnot cycle is
  1.    A reversible cycle
  2.    An irreversible cycle
  3.    A semi-reversible cycle
  4.    A quasi static cycle
 Discuss Question
Answer: Option A. -> A reversible cycle
Question 73. Elements of pairs held together mechanically is known as
  1.    Closed pair
  2.    Open pair
  3.    Mechanical pair
  4.    Rolling pair
 Discuss Question
Answer: Option A. -> Closed pair
Question 74. The unbalanced primary forces in a reciprocating engine are
  1.    Balanced completely
  2.    Balanced partially
  3.    Balanced by secondary forces
  4.    Not balanced
 Discuss Question
Answer: Option B. -> Balanced partially
Question 75. A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force
  1.    The reaction on me inner wheels increases and on the outer wheels decreases
  2.    The reaction on the outer wheels increases and on the inner wheels decreases
  3.    The reaction on the front wheels increases and on the rear wheels decreases
  4.    The reaction on the rear wheels increases and on the front wheels decreases
 Discuss Question
Answer: Option B. -> The reaction on the outer wheels increases and on the inner wheels decreases
Question 76. The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.
  1.    Zero
  2.    Minimum
  3.    Maximum
  4.    None of these
 Discuss Question
Answer: Option A. -> Zero
Question 77. When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be
  1.    $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} + 1}}{{\text{n}}}$$
  2.    $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} - 1}}{{\text{n}}}$$
  3.    $${\omega ^2}{\text{r}} \times \frac{{\text{n}}}{{{\text{n}} + 1}}$$
  4.    $${\omega ^2}{\text{r}} \times \frac{{\text{n}}}{{{\text{n}} - 1}}$$
 Discuss Question
Answer: Option A. -> $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} + 1}}{{\text{n}}}$$
Question 78. The velocity of a body moving with simple harmonic motion is __________ at the mean position.
  1.    Zero
  2.    Minimum
  3.    Maximum
  4.    None of these
 Discuss Question
Answer: Option C. -> Maximum
Question 79. When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be
  1.    Minimum
  2.    Zero
  3.    Maximum
  4.    None of these
 Discuss Question
Answer: Option B. -> Zero
Question 80. When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be
  1.    $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} + 1}}{{\text{n}}}$$
  2.    $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} - 1}}{{\text{n}}}$$
  3.    $${\omega ^2}{\text{r}} \times \frac{{\text{n}}}{{{\text{n}} + 1}}$$
  4.    $${\omega ^2}{\text{r}} \times \frac{{\text{n}}}{{{\text{n}} - 1}}$$
 Discuss Question
Answer: Option B. -> $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} - 1}}{{\text{n}}}$$

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