Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 247 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

If lead angle of worm is 13° and lead of worm is 40 mm. Find pitch circular diameter of worm
A. 53.22 mm
B. 55.15 mm
C. 27.67 mm
D. None of the above
Answer» C. 27.67 mm
Discussion
2.

The number of links and instantaneous centers in a reciprocating engine mechanism are ___________________?
A. 4, 4
B. 4, 5
C. 5, 4
D. 6, 4
E. 4, 6
Answer» F.
Discussion
3.

If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be_______________?
A. less
B. more
C. same
D. data are insufficient to determine same
E. none of the above
Answer» B. more
Discussion
4.

Which energy is absorbed by the brakes of an elevator during braking process?
A. Potential energy
B. Kinetic energy
C. Both a. and b.
D. None of the above
Answer» B. Kinetic energy
Discussion
5.

Watt's mechanism is based on
A. inversions of single slider chain mechanism
B. inversions of double slider chain mechanism
C. inversions of four bar chain mechanism
D. inversions of five bar chain mechanism
Answer» D. inversions of five bar chain mechanism
Discussion
6.

What are crank effort diagrams?
A. Turning moment diagram is drawn on cartesian co-ordinates
B. Turning moment diagram is drawn on polar co-ordinates
C. Turning moment (T) is plotted against crank angle θ for various crank positions
D. All of the above
Answer» D. All of the above
Discussion
7.

The difference between which two factors denotes the correction couple?
A. Difference between force required to accelerate non dynamically equivalent system and dynamically equivalent system
B. Difference between torque required to accelerate non dynamically equivalent system and dynamically equivalent system
C. Difference between torque required to decelerate dynamically equivalent system and non dynamically equivalent system
D. none of the above
Answer» C. Difference between torque required to decelerate dynamically equivalent system and non dynamically equivalent system
Discussion
8.

What is meant by Kinetics?
A. It deals with the study of relative motion between different components of a machine
B. It deals with the forces acting on different components
C. It deals with the inertia forces acting on different components of the engine
D. All of the above
Answer» D. All of the above
Discussion
9.

Which among the following involves designing of machine components concerning its shape and size?
A. Kinetics
B. Kinematics
C. Synthesis
D. All of the above
Answer» D. All of the above
Discussion
10.

A connecting rod has periodic time of 1.5 sec/cycle for one oscillation. Calculate radius of gyration, when centre of gravity is at a distance of 500 mm from the small end.
A. 0.1325 m
B. 0.1719 m
C. 0.0295 m
D. 0.555 m
Answer» C. 0.0295 m
Discussion
11.

The equation j = (3/2)n – 2 represents relation between number of joints (L.H.S) and number of links (R.H.S). The chain is constrained if
A. L.H.S = R.H.S
B. L.H.S < R.H.S
C. L.H.S > R.H.S
D. None of the above
Answer» B. L.H.S < R.H.S
Discussion
12.

According to D' Alembert's principle, the body is in equilibrium position if
A. inertia force is applied in the direction opposite to the resultant force
B. inertia force is applied in the same direction of the resultant force
C. both a. and b.
D. none of the above
Answer» B. inertia force is applied in the same direction of the resultant force
Discussion
13.

Relative motion between links is more than one direction which is unpredictable is known as
A. completely constrained motion
B. incompletely constrained motion
C. successfully constrained motion
D. none of the above
Answer» C. successfully constrained motion
Discussion
14.

Shaft with taper key is an example of
A. incompletely constrained motion
B. completely constrained motion
C. successfully constrained motion
D. all of the above
Answer» D. all of the above
Discussion
15.

Trifilar suspension system is used to determine mass moment of inertia of
A. disc
B. flywheel
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
16.

On which factors does law of friction depend?
A. Nature of material
B. Area of contact between surfaces
C. Velocity of sliding
D. All of the above
Answer» B. Area of contact between surfaces
Discussion
17.

In centrifugal clutches, when is the contact between shoe friction lining and surface of drum observed?
A. When centrifugal force is less than spring force
B. When centrifugal force is equal to spring force
C. When centrifugal force is greater than spring force
D. None of the above
Answer» C. When centrifugal force is greater than spring force
Discussion
18.

Scotch yoke mechanism is the inversion of
A. Single slider kinematic chain
B. Double slider kinematic chain
C. Four bar chain
D. None of the above
Answer» C. Four bar chain
Discussion
19.

Which clutch is known as wet clutch?
A. Single plate clutch
B. multi plate clutch
C. both a. and b.
D. none of the above
Answer» C. both a. and b.
Discussion
20.

Identify the type of absorption dynamometer ?
A. Epicyclic dynamometer
B. Prony brake dynamometer
C. Torsion dynamometer
D. Tatham dynamometer
Answer» C. Torsion dynamometer
Discussion
21.

Which parameters can be measured using a dynamometer?
A. Force
B. Torque
C. Power
D. All of the above
Answer» E.
Discussion
22.

If brakes are applied on front wheels of a car and if it moves on a level road, then retardation of the car is calculated using the formula
A. μ g
B. [μ g (l-x)] / (l + μ h)
C. (μ g x) / (l- μ h)
D. none of the above
Answer» D. none of the above
Discussion
23.

Calculate torque acting on the crank, if tangential force acting on the engine is 150 kN and 300 mm is the crank radius.
A. 45 kN.m
B. 500 kN/m
C. 2 kN/m
D. none of the above
Answer» B. 500 kN/m
Discussion
24.

Which of the following condition is true for uniform wear theory?
A. p = constant
B. p/r = constant
C. p.r = constant
D. none of the above
Answer» D. none of the above
Discussion
25.

Calculate the thrust in connecting rod, if piston effort is 200 kN and crank makes an angle of 45° from TDC. Assume obliquity ratio = 3.5
A. 900.80 kN
B. 204.20 kN
C. 195.87 kN
D. 970.02 kN
Answer» C. 195.87 kN
Discussion
26.

Calculate the angle of driving shaft, if the two shafts of the Hooke's joint are inclined at an angle of 18.50°
A. 45.56°
B. 37.70°
C. 39.17°
D. 41.95°
Answer» E.
Discussion
27.

Torsional pendulum is used to determine mass moment of inertia of
A. flywheel
B. rigid bar
C. both a. and b.
D. none of the above
Answer» B. rigid bar
Discussion
28.

In a Hooke's joint, maximum velocity ratio between driving and driven shaft is possible if θ is
A. 0
B. π
C. 2 π
D. all of the above
Answer» E.
Discussion
29.

Which of the following statements is true for gear drive?
A. Gear drives can transmit very large power
B. Gear drives have low transmission efficiency
C. Gear drives require more space
D. All of the above
Answer» B. Gear drives have low transmission efficiency
Discussion
30.

Determine the power transmitted if dead weight on brake is 70 kg and engine has a speed of 300 rpm. One end of the rope has a diameter of 0.05 m is attached to a spring balance which has reading of 150 N, diameter of drum is 1 m.
A. 8.851 kW
B. 8.851 W
C. 1319.46 W
D. none of the above
Answer» B. 8.851 W
Discussion
31.

Herring-bone gears are also known as
A. Hypoid gears
B. Helical gears
C. Spiral gears
D. None of the above
Answer» C. Spiral gears
Discussion
32.

What is meant by interference?
A. Mating of conjugate profiles of a tooth
B. Mating of involute profiles of a tooth
C. Mating of non-involute profiles of a tooth
D. All of the above
Answer» D. All of the above
Discussion
33.

One quaternary joint is equal to how many binary joints?
A. 4
B. 3
C. 2
D. none of the above
Answer» C. 2
Discussion
34.

The relation between number of links and number of lower pairs is given as n = 2p – 4. If L.H.S is less than R.H.S of this equation then the chain is
A. constrained
B. locked
C. structure
D. unconstrained
Answer» E.
Discussion
35.

Calculate the angular speed of driven shaft if the driving shaft has angular speed of 400 rpm. When shaft angle is 20° and angle of rotation is 40° in Hooke's joint.
A. 40.23 rad/s
B. 42.45 rad/s
C. 36.82 rad/s
D. None of the above
Answer» C. 36.82 rad/s
Discussion
36.

Which relation is used to denote condition for equal speeds, when driving and driven shafts are connected by Hook's joint?
A. tan θ = ± √cos α
B. tan θ = ± √cot α
C. tan θ = ± √sin α
D. cot θ = ± √cos α
Answer» B. tan θ = ± √cot α
Discussion
37.

According to loop closure equation, in a closed loop mechanism the sum of relative position vectors for the links is
A. less than 1
B. zero
C. greater than 1
D. none of the above
Answer» C. greater than 1
Discussion
38.

Double block brake is a type of
A. Band brake
B. Internal expanding shoe brake
C. Shoe brake
D. None of the above
Answer» D. None of the above
Discussion
39.

Frictional torque transmitted by uniform wear theory is more than torque transmitted by uniform pressure theory
A. True
B. False
Answer» C.
Discussion
40.

In single shoe brake, when is uniform normal pressure observed between block and drum?
A. θ < 60°
B. 2θ < 90°
C. 2θ < 60°
D. θ > 30°
Answer» D. θ > 30°
Discussion
41.

(ω cos θ) / n is the formula used to calculate
A. angular velocity of connecting rod
B. velocity of piston
C. angular acceleration of connecting rod
D. All of the above
Answer» B. velocity of piston
Discussion
42.

Which type of brakes have wooden blocks placed inside flexible steel band?
A. Block brake
B. Band brake
C. Band and Block brake
D. Pivoted block brake
Answer» D. Pivoted block brake
Discussion
43.

Tangential force acting on the helical gear is 5000 N. Calculate the axial force acting on a helical gear having helix angle of 25°.
A. 2113.09 N
B. 4531.53 N
C. 2331.53 N
D. 10722.5 N
Answer» D. 10722.5 N
Discussion
44.

Why is double Hooke's joint used?
A. To obtain uniform velocity ratio
B. To obtain variable velocity ratio
C. Both a. and b.
D. None of the above
Answer» B. To obtain variable velocity ratio
Discussion
45.

In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is _______________?
A. equal to sum of other two
B. greater than sum of other two
C. less than sum of other two
D. there is no such relationship
E. none of the above
Answer» D. there is no such relationship
Discussion
46.

Cam and follower is an example of
A. force closed pair
B. unclosed pair
C. open pairs
D. all of the above
Answer» E.
Discussion
47.

Which pairs are considered as higher pairs?
A. When transmitting motion, two links have line or point contact between them
B. When transmitting motion, two links have surface contact or line contact between them
C. Both A & B
D. None of these
Answer» B. When transmitting motion, two links have surface contact or line contact between them
Discussion
48.

Which of the following kinematic pairs is classified depending upon the mechanical arrangement between the links?
A. Primatic pair
B. Revolute pair
C. Force closed pair
D. Sliding pair
Answer» D. Sliding pair
Discussion
49.

Calculate center distance between two helical gears which has helix angle of 20°, when normal module is 10. Pinion and gear have 30 and 70 teeth respectively
A. 532.02 mm
B. 212.78 mm
C. 500 mm
D. None of the above
Answer» B. 212.78 mm
Discussion
50.

Which theory is used to determine safe design of bearings?
A. Uniform wear theory
B. Uniform pressure theory
C. both a. and b.
D. none of the above
Answer» C. both a. and b.
Discussion