Mechanical Engineering Archives

1371. A jolt machine is used to

ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

ram the sand harder at the back of the mould and softer on the pattern face

produce uniform sand hardness throughout the mould

produce uniform packin

✅ The correct answer is option A.

1372. A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

6 kN/m

12 kN/m

24 kN/m

30 kN/m

✅ The correct answer is option B.

1373. In an isothermal process,

there is no change in temperature

there is no change in enthalpy

there is no change in internal energy

all of these

✅ The correct answer is option D.

1374. In a double acting compressor, the air is compressed

in one cylinder

in two cylinders

in a single cylinder on both sides of the piston

in two cylinders on bo

✅ The correct answer is option C.

1375. The ratio of the isentropic work to the Euler’s work is known as pressure coefficient.

Yes

✅ The correct answer is option A.

1376. Gear burnishing is a process for

surface finishing

under-cut gears

cycloidal gears

removing residual stre

✅ The correct answer is option A.

1377. The amount of heat generated per kg of fuel is known as

calorific value

heat energy

lower calorific value

higher calorific value

✅ The correct answer is option A.

1378. A bolt is designed on the basis of __________ with a large factor of safety.

direct tensile stress

direct compressive stress

direct bending stress

direct shear stress

✅ The correct answer is option A.

1379. The natural solid fuel is

wood

coke

anthracite coal

pulverised coal

✅ The correct answer is option A.

1380. Bead wires are made of

steel

copper

zinc

aluminium

✅ The correct answer is option A.