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This set of Dynamics of Machines Multiple Choice Questions & Answers (MCQs) focuses on Dynamics Of Machines Set 5
Q1 | Which of the following is true regarding Ɛ>1?
- transmitted force is greater than applied force
- transmitted force is less than applied force
- spring force is less than applied force
- damping force is less than applied force
Q2 | Isolation factor is twice the transmissibility ratio.
- true
- false
Q3 | The height of a Watt’s governor is
- directly proportional to speed
- directly proportional to (speed)
- inversely proportional to speed
- inversely proportional to (speed)
Q4 | A Watt’s governor can work satisfactorily at speeds from
- 60 to 80 r.p.m
- 80 to 100 r.p.m c) 100 to 200 r.p.m d) 200 to 300 r.p.m
Q5 | The ratio of height of Porter governor to the height of Watt’s governor is
- m/m + m
- m/ m + m
- m + m/m
Q6 | When the sleeve of a porter governor moves upwards, the governor speed
- increases
- decreases
- remains unaffected
- first increases and then decreases
Q7 | When the sleeve of a Porter governor moves downwards, the governor speed
- increases
- decreases
- remains unaffected
- first increases and then decreases
Q8 | In a Porter governor, the balls are attached to the extension of lower links.
- true
- false
Q9 | A Hartnell governor is a
- dead weight governor
- pendulum type governor
- spring loaded governor
- inertia governor
Q10 | A Watt’s governor is a spring loaded governor.
- true
- false
Q11 | Which of the following is a pendulum type governor?
- watt’s governor
- porter governor
- hartnell governor
- none of the mentioned
Q12 | The axis of precession is to the plane in which the axis of spin is going to rotate.
- parallel
- perpendicular
- spiral
- none of the mentioned
Q13 | A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be
- 1/2 iω2
- iω2
- 1/2 iωωp
- iωωp
Q14 | The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be
- to dip the nose and tail
- to raise the nose and tail
- to raise the nose and dip of the tail
- to dip the nose and raise the tail
Q15 | The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the right. The effect of gyroscopic couple on the aeroplane will be to dip the nose and raise the tail.
- true
- false
Q16 | The steering of a ship means
- movement of a complete ship up and down in vertical plane about transverse axis
- turning of a complete ship in a curve towards right or left, while it moves forward
- rolling of a complete ship side-ways
- none of the mentioned
Q17 | The rolling of a complete ship side-ways is known as pitching of a ship.
- true
- false
Q18 | The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.
- true
- false
Q19 | The pitching of a ship is assumed to take place with simple harmonic motion.
- true
- false
Q20 | When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
- to move the ship towards star-board
- to move the ship towards port side
- to raise the bow and lower the stern
- to raise the stern and lower the bow
Q21 | It is required to lift water at the top of a high building at the rate of 50 litres/min. Assuming the losses due to friction equivalent to 5 m and those due to leakage equal to 5 m head of water, efficiency of pump 90%, decide the kilowatt capacity of motor required to drive the pump.
- 0.102 kw
- 0.202 kw
- 0.302 kw
- 0.402 kw
Q22 | Power is transmitted by an electric motor to a machine by using a belt drive. The tensions on the tight and slack side of the belt are 2200 N and 1000 N respectively and diameter of the pulley is 600 mm. If speed of the motor is 1500 r.p.m, find the power transmitted.
- 46.548 kw
- 56.548 kw
- 66.548 kw
- 76.548 kw
Q23 | The flywheel of an engine has a mass of 200 kg and radius of gyration equal to 1 m. The average torque on the flywheel is 1200 Nm. Find the angular acceleration of flywheel and the angular speed after 10 seconds starting from rest.
- 3 rad/s
- 4 rad/s
- 5 rad/s
- 6 rad/s
Q24 | 6 x 10 = 6 rad/s.
- 2.055 m
- 3.055 m
- 4.055 m
- 5.055 m
Q25 | Calculate the work done per minute by a punch tool making 20 working strokes per min when a 30 mm diametre hole is punched in 5 mm thick plate with ultimate shear strength og 450 Mpa in each stroke.
- 10.69 knm
- 20.69 knm
- 30.69 knm
- 40.69 knm