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Theory-of-machines Questions Set 4:

Quiz Mode

The unit of mass moment of inertia in SI units is

m⁴

kgf⋅m⋅s²

kg⋅m²

N⋅m

Solution:

To avoid interference, what is the maximum length of the path of approach?

RsinΨ

rsinΨ

RcosΨ

RcotΨ

Solution:

In an engine, if the clearance volume is 2 m³ and the stroke volume is 17 m³, determine the compression ratio.

8.5

9.5

7.7

Solution:

When two elements of a pair are connected such that one element turns about the other fixed element, it is called a:

Turning Pair

Spherical Pair

Cylindrical Pair

Screw Pair

Solution:

The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is:

n = (l - 1) - j

n = 2(l - 1) - 2j

n = 3(l - 1) - 2j

n = 4(l - 1) - 3j

Solution:

In the Morse test of a petrol engine, which of the following is cut off or blocked in one of the cylinders?

Fuel injector

Spark plug

Connection to crankshaft

Connection to camshaft

Solution:

Explain the reason for the low thermal efficiency of spark-ignition (SI) engines.

High compression ratio.

Low temperature range.

Low compression ratio.

High calorific value of fuel.

Solution:

Watt's mechanism is based on which of the following mechanisms?

inversions of double slider chain mechanism

inversions of single slider chain mechanism

inversions of four-bar chain mechanism

inversions of six-bar chain mechanism

Solution:

An ejector mechanism consists of a helical compression spring with a spring constant of K = 981 × 10³ N/m. The spring is pre-compressed by 300 mm from its free state. If the spring is used to eject a mass of 100 kg, through what distance will the mass move up?

500 mm

300 mm

600 mm

400 mm

Solution:

Consider the following equation of the controlling force of a Hartnell governor: F = p + qr, where r is the radius of the balls, and p and q are constants. The governor becomes isochronous when:

p = 0 and q is positive

p is negative and q is positive

q is negative and p is positive

p = 0 and q is negative

Theory-of-machines Questions Set 4:

The unit of mass moment of inertia in SI units is

Solution:

To avoid interference, what is the maximum length of the path of approach?

Solution:

In an engine, if the clearance volume is 2 m³ and the stroke volume is 17 m³, determine the compression ratio.

Solution:

When two elements of a pair are connected such that one element turns about the other fixed element, it is called a:

Solution:

The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is:

Solution:

In the Morse test of a petrol engine, which of the following is cut off or blocked in one of the cylinders?

Solution:

Explain the reason for the low thermal efficiency of spark-ignition (SI) engines.

Solution:

Watt's mechanism is based on which of the following mechanisms?

Solution:

An ejector mechanism consists of a helical compression spring with a spring constant of K = 981 × 10³ N/m. The spring is pre-compressed by 300 mm from its free state. If the spring is used to eject a mass of 100 kg, through what distance will the mass move up?

Solution:

Consider the following equation of the controlling force of a Hartnell governor: F = p + qr, where r is the radius of the balls, and p and q are constants. The governor becomes isochronous when:

Solution:

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