In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

Minimize the effect of primary forces

Minimize the effect of secondary forces

To start the locomotive quickly

Coriolis component is encountered in

Quick return mechanism of shaper

The periodic time of one oscillation for a simple pendulum is

(1/2≈ì√Ñ). ‚Äö√ √∂(l/g)

2≈ì√Ñ. ‚Äö√ √∂(g/l)

(1/2≈ì√Ñ). ‚Äö√ √∂(g/l)

2≈ì√Ñ. ‚Äö√ √∂(l/g)

(1/2≈ì√Ñ). ‚Äö√ √∂(l/g)

Varies as the square root of the speed

Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.

Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

Varies as the square root of the speed

Varies inversely with the square of the speed

The Klein's diagram is used when

Crank has nonuniform angular velocity

Crank has uniform angular velocity

Crank has nonuniform angular velocity

Crank has uniform angular acceleration

Crank has nonuniform angular acceleration

For changing the direction of motion of the belt

The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels

The Ackerman steering gear consists of turning pairs

The Ackerman steering gear is most economical

In considering friction of a V-thread, the virtual coefficient of friction (≈í¬∫‚Äö√á√Ö) is given by#

≈í¬∫‚Äö√á√Ö = ≈í¬∫ sin ≈í‚â§

≈í¬∫‚Äö√á√Ö = ≈í¬∫ cos ≈í‚â§

≈í¬∫‚Äö√á√Ö = ≈í¬∫/sin ≈í‚â§

≈í¬∫‚Äö√á√Ö = ≈í¬∫/cos ≈í‚â§

977 + Mcqs in Theory Of Machine in Mechanical Engineering Page 20 McqOptions

951.	The moment on the pulley which produces rotation is called
A.	Inertia
B.	Momentum
C.	Moment of momentum
D.	Torque
Answer» E.

Discussion

952.	In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to
A.	Minimize the effect of primary forces
B.	Minimize the effect of secondary forces
C.	Have perfect balancing
D.	To start the locomotive quickly
Answer» C. Have perfect balancing

Discussion

953.	A point B on a rigid link AB moves with respect to A with angular velocity ≈ì√¢ rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A)#
A.	vBA ‚àö√≥ AB
B.	vBA /AB
C.	v¬¨‚â§BA
D.	v¬¨‚â§BA /AB
Answer» E.

Discussion

954.	Coriolis component is encountered in
A.	Quick return mechanism of shaper
B.	Four bar chain mechanism
C.	Slider crank mechanism
D.	Both (A) and (C) above
Answer» B. Four bar chain mechanism

Discussion

955.	The periodic time of one oscillation for a simple pendulum is
A.	2≈ì√Ñ. ‚Äö√ √∂(g/l)
B.	(1/2≈ì√Ñ). ‚Äö√ √∂(g/l)
C.	2≈ì√Ñ. ‚Äö√ √∂(l/g)
D.	(1/2≈ì√Ñ). ‚Äö√ √∂(l/g)
Answer» D. (1/2≈ì√Ñ). ‚Äö√ √∂(l/g)

Discussion

956.	If ≈ì√¢/≈ì√¢n = 2, where co is the frequency of excitation and ≈ì√¢n is the natural frequency of vibrations, then the transmissibility of vibration will the#
A.	0.5
B.	1
C.	1.5
D.	2
Answer» C. 1.5

Discussion

957.	Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts?
A.	Theory of machines
B.	Applied mechanics
C.	Mechanisms
D.	Kinetics
Answer» E.

Discussion

958.	A higher pair has__________.
A.	Point contact
B.	Surface contact
C.	No contact
D.	None of the above
Answer» B. Surface contact

Discussion

959.	The relation between number of links (l) and number of joints (j) in a kinematic chain is
A.	l = (1/2).(j + 2)
B.	l = (2/3).(j + 2)
C.	l = (3/4).(j + 3)
D.	l = j + 4
Answer» C. l = (3/4).(j + 3)

Discussion

960.	The component of the acceleration, parallel to the velocity of the particle, at the given instant is called
A.	Radial component
B.	Tangential component
C.	Coriolis component
D.	None of these
Answer» C. Coriolis component

Discussion

961.	The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called
A.	Dedendum
B.	Addendum
C.	Clearance
D.	Working depth
Answer» D. Working depth

Discussion

962.	In automobiles the power is transmitted from gear box to differential through
A.	Bevel gear
B.	Universal joint
C.	Hooke's joint
D.	Knuckle joint
Answer» D. Knuckle joint

Discussion

963.	The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.
A.	Zero
B.	Minimum
C.	Maximum
D.	None of these
Answer» B. Minimum

Discussion

964.	Hammer blow
A.	Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
B.	Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
C.	Varies as the square root of the speed
D.	Varies inversely with the square of the speed
Answer» C. Varies as the square root of the speed

Discussion

965.	The Klein's diagram is used when
A.	Crank has uniform angular velocity
B.	Crank has nonuniform angular velocity
C.	Crank has uniform angular acceleration
D.	Crank has nonuniform angular acceleration
Answer» B. Crank has nonuniform angular velocity

Discussion

966.	Idler pulley is used
A.	For changing the direction of motion of the belt
B.	For applying tension
C.	For increasing velocity ratio
D.	All of the above
Answer» C. For increasing velocity ratio

Discussion

967.	In a simple train of wheels, the velocity ratio __________ the intermediate wheels.
A.	Depends upon
B.	Is independent of
C.	Either A or B
D.	None of these
Answer» C. Either A or B

Discussion

968.	The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because
A.	Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
B.	The Ackerman steering gear consists of turning pairs
C.	The Ackerman steering gear is most economical
D.	Both (A) and (B)
Answer» E.

Discussion

969.	Pulley in a belt drive acts as
A.	Cylindrical pair
B.	Turning pair
C.	Rolling pair
D.	Sliding pair
Answer» D. Sliding pair

Discussion

970.	In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to
A.	0.2
B.	0.4
C.	0.6
D.	0.8
Answer» D. 0.8

Discussion

971.	What is the number of instantaneous centers for an eight link mechanism?
A.	15
B.	28
C.	30
D.	8
Answer» C. 30

Discussion

972.	The behaviour of gases can be fully determined by
A.	1 law
B.	2 laws
C.	3 laws
D.	4 laws
Answer» E.

Discussion

973.	The flank of the tooth is the surface of the tooth __________ the pitch surface.
A.	Above
B.	Below
C.	At
D.	None of these
Answer» C. At

Discussion

974.	Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?
A.	D-slide valve
B.	Governor
C.	Flywheel
D.	Meyer's expansion valve
Answer» D. Meyer's expansion valve

Discussion

975.	When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a
A.	Screw pair
B.	Spherical pair
C.	Turning pair
D.	Sliding pair
Answer» E.

Discussion

976.	In considering friction of a V-thread, the virtual coefficient of friction (≈í¬∫‚Äö√á√Ö) is given by#
A.	≈í¬∫‚Äö√á√Ö = ≈í¬∫ sin ≈í‚â§
B.	≈í¬∫‚Äö√á√Ö = ≈í¬∫ cos ≈í‚â§
C.	≈í¬∫‚Äö√á√Ö = ≈í¬∫/sin ≈í‚â§
D.	≈í¬∫‚Äö√á√Ö = ≈í¬∫/cos ≈í‚â§
Answer» E.

Discussion

977.	In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.
A.	Yes
B.	No
C.	Unpredictable
D.	None of these
Answer» C. Unpredictable

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

The moment on the pulley which produces rotation is called

In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

A point B on a rigid link AB moves with respect to A with angular velocity ≈ì√¢ rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A)#

Coriolis component is encountered in

The periodic time of one oscillation for a simple pendulum is

If ≈ì√¢/≈ì√¢n = 2, where co is the frequency of excitation and ≈ì√¢n is the natural frequency of vibrations, then the transmissibility of vibration will the#

Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts?

A higher pair has__________.

The relation between number of links (l) and number of joints (j) in a kinematic chain is

The component of the acceleration, parallel to the velocity of the particle, at the given instant is called

The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called

In automobiles the power is transmitted from gear box to differential through

The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.

Hammer blow

The Klein's diagram is used when

Idler pulley is used

In a simple train of wheels, the velocity ratio __________ the intermediate wheels.

The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Pulley in a belt drive acts as

In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

What is the number of instantaneous centers for an eight link mechanism?

The behaviour of gases can be fully determined by

The flank of the tooth is the surface of the tooth __________ the pitch surface.

Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?

When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a

In considering friction of a V-thread, the virtual coefficient of friction (≈í¬∫‚Äö√á√Ö) is given by#

In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.