A concrete wall generally
A.Reflects sound
B.Absorbs sound
C.Transmits sound
D.Creates sound
Category: Machine Design Mcqs
What type of gears are provided in a switch gear?
A.Spur gears
B.Helical gear
C.Bevel gears
D.Herringbone gears
E.None of the above
A spherical gas tank is made of 1 cm steel plate hemispheres but welded together. The tank is 1503 cm in diameter. The allowable internal pressure to which tank may be subjected is the permissible stress be limited to 840 kg/sq cm would be in the range
A.1 to 1.5 kg/sq-cm
B.1.5 to 2.0 kg/sq-cm
C.2.0 to 2.5 kg/sq-cm
D.2.5 to 3.5 kg/sq-cm
E.3.5 to 5.0 kg/sq-cm
The fatigue limit of a material
A.Is greatly decreased by poor surface conditions
B.Is improved if there is rough surface
C.Is independent of surface conditions
D.Surface defects which extend upto core have no influence of fatigue limits
E.None of the above
A unknown weight falls through 1 cm on a collar rigidly attached to the lower end of a vartical bar 3 cm long and 6 cm2 in section. If the maximum instantaneous extension is 2 mm the value of stress would be
A.500 kg/cm2
B.667 kg/cm2
C.1000 kg/cm2
D.1333 kg/cm2
E.1500 kg/cm2
In case of spur gears the higher pressure angle results in
A.Weaker teeth
B.Non-uniform motion transmission
C.Begger size of gear
D.Wider base and stronger teeth
E.Narrow base and weaker teeth
Ball bearing type screws
A.Friction is more
B.Are self-locking
C.Have load bearing capacity for more than vee threads
D.Sliding friction is replaced by rolling friction
E.There is a ball bearing provided on the screwed shafts
Washer are generally specified by
A.Thickness
B.Outer diameter
C.Central hole diameter
D.Mean diameter
E.(A) and (C) above
Induction motors are generally provided with
A.Bush bearings
B.Sleeve bearings
C.Magnetic bearings
D.Ball or roller bearings
E.Mitchel’s thrust bearings
The gears used for non-intersecting perpendicular shafts are
A.Spur gears
B.Helical gears
C.Double helical gears
D.Hypoid gears
E.Herringbone gears
