Mechanical Engineering MCQs

A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B. A slot is cut partly in middle of nut and then slot reduced by tightening a screw
C. A hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
D. Through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

A. 0.2
B. 0.25
C. 0.50
D. 0.6

A. Bolts
B. Keys
C. Cotters
D. Rivets

A. Thickness of plates to be riveted
B. Length of rivet
C. Diameter of head
D. Nominal diameter

A. Metric threads of 33 nos in 2 cm.
B. Metric threads with cross-section of 33 mm
C. Metric threads of 33 mm outside diameter and 2 mm pitch
D. Bolt of 33 mm nominal diameter having 2 threads per cm

A. Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
B. Providing forced cooling air
C. Injecting excess fuel for raising more load
D. Supplying compressed air to remove combustion products fully

A. The ratio of volumes of air in cylinder before compression stroke and after compression stroke
B. Volume displaced by piston per stroke and clearance volume in cylinder
C. Ratio of pressure after compression and before compression
D. Swept volume/cylinder volume

A. Kcal
B. Kcal/kg
C. Kcal/m2
D. Kcal/m²

A. Low heat value of oil
B. High heat value of oil
C. Net claorific value of oil
D. Calorific value of fuel

A. Low heat value of oil
B. High heat value of oil
C. Net calorific value of oil
D. Calorific value of fuel