MCQs of Balancing of Reciprocating Masses (Dynamics of Machinery - 3151911)

Dynamics of Machinery (3151911) MCQs

MCQs of Balancing of Reciprocating Masses

Showing 31 to 40 out of 49 Questions

31.

Tractive force attains maxima or minima when the crank angle is 90 degrees.

(a)	True
(b)	False

32.

The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of the crank, and θ = Angle of the inclination of the crank to the line of stroke)

(a)	$m r ω^{2} \cos θ$
(b)	$c m r ω^{2} \sin θ$
(c)	$(1 - c) m r ω^{2} (\cos θ - \sin θ)$
(d)	$m r ω^{2} (\cos θ - \sin θ)$

33.

The tractive force is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

(a)	90° and 225°
(b)	135° and 180°
(c)	180° and 225°
(d)	135° and 315°

34.

The magnitude of swaying couple due to partial balance of the primary unbalancing force in the locomotive is

(a)	inversely proportional to the reciprocating mass
(b)	directly proportional to the square of the distance between the center lines of the two cylinders
(c)	inversely proportional to the distance between the centerlines of the two cylinders
(d)	directly proportional to the distance between the centerlines of the two cylinders

35.

Which of the following has a tendency to sway the engine in alternately in clockwise and anticlockwise directions?

(a)	Swaying couple
(b)	Tractive force
(c)	Hammer blow
(d)	Hammer couple

36.

At which of the following angles in degrees does the swaying couple attains a maximum value?

(a)	135
(b)	45
(c)	90
(d)	60

37.

If the maximum value occurs at 45 degrees then at which of the following angles in degrees will the swaying couple attains its maximum value again?

(a)	135
(b)	45
(c)	225
(d)	60

38.

The effect of swaying couple in a locomotive is resisted by the side pressure between the flanges of the tyres of the wheel and the inside of the rails.

(a)	Agree
(b)	Disagree

39.

If c be the fraction of the reciprocating parts of mass m to be balanced per cylinder of a steam locomotive with crank radius r, angular speed ω, the distance between center lines of two cylinders a, then the magnitude of the maximum swaying couple is given by

(a)	$\frac{1 - c}{2} \times m r ω^{2} a$
(b)	$\frac{1 - c}{\sqrt{2}} \times m r ω^{2} a$
(c)	$\sqrt{2} (1 - c) m r ω^{2} a$
(d)	$2 (1 - c) m r ω^{2} a$

40.

The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke ( θ ) is equal to

(a)	45° and 135°
(b)	90° and 135°
(c)	135° and 225°
(d)	45° and 225°

Showing 31 to 40 out of 49 Questions