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This set of Mechatronics Multiple Choice Questions & Answers (MCQs) focuses on Mechatronics Set 4
Q1 | When a periodic disturbing force is applied to a machine, the force is transmitted to the foundation by the means of spring.
- true
- false
Q2 | Which of the following is a type of transmitted force to the foundation?
- damping force
- undamping force
- tensile force
- torsional force
Q3 | If the damper is not provided and the system is in resonance, which of the following is the correct isolation factor?
- 0
- 1/2
- 1/4
- infinity
Q4 | If isolation factor is negative, then what is the phase difference between transmitted and disturbing force?
- 180°
- 90°
- 450°
- 360°
Q5 | 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
Q6 | Isolation factor is twice the transmissibility ratio.
- true
- false
Q7 | The height of a Watt’s governor is
- directly proportional to speed
- directly proportional to (speed)
- inversely proportional to speed
- inversely proportional to (speed)
Q8 | 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
- answer: a
- explanation: a watt’s governor may only
Q9 | When the sleeve of a Porter governor moves downwards, the governor speed
- increases
- decreases
- remains unaffected
- first increases and then decreases
Q10 | In a Porter governor, the balls are attached to the extension of lower links.
- true
- false
Q11 | A Hartnell governor is a
- dead weight governor
- pendulum type governor
- spring loaded governor
- inertia governor
Q12 | A Watt’s governor is a spring loaded governor.
- true
- false
Q13 | Which of the following is a pendulum type governor?
- watt’s governor
- porter governor
- hartnell governor
- none of the mentioned
Q14 | 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
Q15 | 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
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 | 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
Q21 | 6 x 10 = 6 rad/s.
- 2.055 m
- 3.055 m
- 4.055 m
- 5.055 m
Q22 | 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
Q23 | In latitude 25.0 S, SA (spin axis) of a FG (free gyro) is in position S40E and horizontal. Find the tilt after 6 hours.
- 61.16 up
- 61.16 down c) 51.15 up
- d) none of the mentioned
Q24 | 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 r left, while it moves forward
- rolling of a complete ship sideways
- none of the mentioned
Q25 | When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
- to move the ship towards starboard
- to move the ship towards port side
- to raise the bow and lower the stern
- to raise the stern and lower the bow