List of top Mechanical Engineering Questions

The gearing of a machine tool is shown in the below figure. The motor shaft is connected to gear A and rotates at 975 rpm. The gear wheels B, C, D, and E are fixed to parallel shafts rotating together. The final gear F is fixed on the output shaft. What is the speed of gear F? The number of teeth on each gear are as follows: \( A=20 \), \( B=50 \), \( C=25 \), \( D=75 \), \( E=26 \), and \( F=65 \). 

An intermediate shaft of a gearbox, supporting two spur gears A and B and mounted between two bearings C1 and C2, is shown in the below figure. The pitch circle diameters of gears A and B are 500 and 250 mm respectively. The shaft is made of alloy steel 20MnCr5. (\( S_{ut} = 620 \) and \( S_{yt} = 480 \) N/mm\(^2\)). The factors \( k_b \) and \( k_t \) of the ASME code are 2 and 1.5 respectively. The gears are keyed to the shaft. Determine the shaft diameter using the ASME code. 

The following are the selection characteristics considered while choosing a material for brake lining. Identify the incorrect characteristic.

What is the function of Joints in a Robot Manipulator

The link parameters are

The human eye perception is limited to approximately

One single robot for continuous arc welding is unable to resolve the following issue

What is the order of basic transformation of frame {i-1} to frame {i}:
(A). Translation along \(z_{i-1}\) axis by distance \(d_i\)
(B). Rotation by an angle \(\alpha_i\) about \(x_i\)-axis 
(C). Translation along \(x_i\)-axis by distance \(a_i\) 
(D). Rotation by an angle \(\theta_i\) about \(z_{i-1}\)-axis
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In an electrical actuation system, solid-state switches include:
(A) Bipolar transistors
(B) Thyristors and triacs
(C) Relays
(D) Diodes
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The sequence for flow of signal in working principle of microsensors includes:
(A) Input signal
(B) Transducer element
(C) Sensor element
(D) Output signal
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Given below are the two statements:
Statement (I): The scale factor in homogeneous transformation matrix can be any real value.
Statement (II): For robotics study, the scale factor in homogeneous transformation matrix is one.
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Given below are the two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): The end-effector does not contribute to manipulability.
Reason (R): The end-effector is external to the manipulator.
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What is the minimum number of degree of freedom for assembling round peg in round hole

Some of the examples of non-contact sensors includes _______ .
(A) Proximity sensors
(B) Temperature sensors
(C) Torque sensors
(D) Acoustic sensors
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Which of the following sensors can be used to monitor linear and angular velocities and detect motion?
(A) Incremental encoder
(B) Tachogenerator
(C) Piezoelectric sensors
(D) Pyroelectric sensors
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Which of the following pressure control valves is used to sense the hydraulic pressure of an external line and give a signal when it reaches some preset value