Practice Test: Question Set - 03
1. The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is
- (A) (1/2). μ W
cosec α (r₁ + r₂)
- (B) (2/3).μ W
cosec α (r₁ + r₂)
- (C) (1/2). μ W
cosec α [(r₁³ -
r₂³)/(r₁² - r₂²)]
- (D) (2/3). μ W
cosec α [(r₁³ -
r₂³)/(r₁² - r₂²)]
2. The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is
- (A) 0° and 90°
- (B) 180° and
360°
- (C) Both (A) and
(B)
- (D) None of
these
3. Which of the following is false statement in respect of differences between machine and structure?
- (A) Machines
transmit mechanical work, whereas structures transmit forces
- (B) In
machines, relative motion exists between its members, whereas same does not
exist in case of structures
- (C) Machines
modify movement and work, whereas structures modify forces
- (D) Efficiency of machines as
well as structures is below 100 %
4. In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from
- (A) 50°-60°
- (B) 60°-70°
- (C) 70°-80°
- (D) 80°-90°
5. When a body is subjected to transverse vibrations, the stress induced in a body will be
- (A) Shear stress
- (B) Bending
stress
- (C) Tensile
stress
- (D) Compressive
stress
6. The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in
- (A) Transverse
vibrations
- (B) Torsional
vibrations
- (C) Longitudinal
vibrations
- (D) All of these
7. Klein's construction gives a graphic construction for
- (A) Slider-crank
mechanism
- (B) Velocity polygon
- (C) Acceleration polygon
- (D) Four
bar chain mechanism
8. In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then
- (A) Acceleration
and velocity of the piston P is zero
- (B) Acceleration
and velocity of the piston P is maximum
- (C) Acceleration
of the piston P is zero and its velocity is maximum
- (D) Acceleration
of the piston P is maximum and its velocity is zero
9. The Scott-Russell mechanism consists of
- (A) Sliding
and turning pairs
- (B) Sliding
and rotary pairs
- (C) Turning
and rotary pairs
- (D) Sliding pairs only
10. The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.
- (A) Greater than
- (B) Less than
- (C) Equal to
- (D) None
of these
11. In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.
- (A) Equal to
- (B) Directly
proportional to
- (C) Inversely
proportional to
- (D) Independent
of
12. When there is a reduction in amplitude over every cycle of vibration, then the body is said to have
- (A) Free
vibration
- (B) Forced
vibration
- (C) Damped
vibration
- (D) Under
damped vibration
13. Which of the following statement is correct?
- (A) For
constant velocity ratio transmission between two gears, the common normal at
the point of contact must always pass through a fixed point on the line joining
the centers of rotation of gears.
- (B) For
involute gears, the pressure angle changes with the change in center distance
between gears.
- (C) The
epicyclic gear trains involve rotation of at least one gear axis about some
other gear axis.
- (D) All
of the above
14. In multi V-belt transmission, if one of the belt is broken, we have to change the
- (A) Broken belt
- (B) Broken belt and its adjacent
belts
- (C) All the belts
- (D) There is no need of changing
any one as remaining belts can take care of transmission of load
15. The Coriolis component of acceleration depends upon
- (A) Velocity of
slider
- (B) Angular
velocity of the link
- (C) Both (A) and
(B)
- (D) None of
these
Next Tests: