Chapter 6 · MCQ Read Mode

Mechanical Design

A design in which an existing product is adapted with only minor modifications is called:

Design based on mathematical formulae of mechanics is known as:

For ductile materials under static load, the factor of safety is based on:

The ratio of the R10 series of preferred numbers is approximately:

A set of specifications for design and construction intended mainly to achieve safety, often enforced by law, is a:

The main benefit of using standard parts is:

ISO 9001 relates to:

The ISO standard for environmental management systems is:

ISO 45001 replaced:

The management cycle underlying ISO management system standards is:

ASTM standards are mainly concerned with:

In the IS steel designation 40C8, '40' indicates:

A rotating member that supports rotating elements but does not transmit torque is:

The critical speed of a shaft corresponds to:

A coupling suitable for connecting two parallel shafts with a small lateral offset is:

The bearing best suited for heavy combined radial and axial loads, such as vehicle wheel hubs, is:

For ball bearings, the life–load relation is L10 = (C/P)p where p equals:

The bore diameter of a bearing designated 6208 is:

The Wahl factor in helical spring design accounts for:

A power screw is self-locking when:

The efficiency of a self-locking square-threaded screw is:

In designing friction clutches, the uniform wear theory is preferred because it:

According to the Lewis equation, the beam strength of a gear tooth is:

Flat-belt pulleys are crowned in order to:

The theoretical stress concentration factor for a small circular hole in a wide plate under tension is:

The fatigue stress concentration factor Kf is related to Kt and notch sensitivity q by:

Negative rake angles are generally used on:

In orthogonal turning, the largest force component is the:

The press tool component that removes the sheet stock from the punch after the stroke is the:

The force required to blank a 100 mm × 50 mm rectangle from 2 mm sheet with τu = 300 MPa is:

The standard point angle of a general-purpose twist drill is:

A device that holds and locates the workpiece and also guides the cutting tool is a:

In impression-die forging, the purpose of the flash land is to:

Hot-work die steels such as H13 are chosen for forging dies mainly for their:

The most commonly used multipurpose grease thickener is:

Which material is usually machined dry without cutting fluid?

Under static loading, a ductile material is considered to have failed when it:

According to the maximum shear stress theory, the equivalent stress under combined σ and τ is:

For no tension to develop in a rectangular section of width b under an eccentric compressive load, the eccentricity must not exceed:

In a curved beam such as a crane hook, the maximum bending stress occurs at the:

The crushing stress in a key of height h, length l on a shaft of diameter d transmitting torque T is:

In a bolted bracket with eccentric load in the plane of the bolts, the secondary shear load on a bolt is proportional to:

For a bracket bolted to a wall with a load tending to tilt it, the tensile load in a bolt is proportional to:

A cotter joint is used to connect two rods that are subjected to:

A knuckle joint is used where the connected rods require:

The pin of a knuckle joint is designed mainly for:

The most economical beam section for resisting bending is:

Thickness of a thin cylindrical pressure vessel with joint efficiency η and corrosion allowance C is:

The minimum number of independent coordinates required to describe the configuration of a system is its:

A spring-mass system has k = 1600 N/m and m = 4 kg. Its natural frequency is:

A machine produces a static deflection of 0.25 mm on its mounts. Its natural frequency is about:

Two springs of stiffness k each connected in series have an equivalent stiffness of:

The critical damping coefficient of a system with mass m and stiffness k is:

A system returns to equilibrium in the shortest possible time without oscillating when it is:

The damped natural frequency is related to the undamped natural frequency by:

For a viscously damped system at resonance (r = 1), the magnification factor is:

At resonance, the phase angle between the exciting force and displacement is:

Vibration isolation (transmissibility < 1) is achieved only when the frequency ratio is:

In the isolation region (r > √2), increasing damping:

A two-degree-of-freedom system has:

The first step in the problem-solving process is to:

A good problem statement should:

According to Graham Wallas, the correct sequence of the creative process is:

The 'Aha!' moment when a solution suddenly appears is called:

The stage in which the idea is tested and refined is:

For an invention to be patentable, it must be:

The most important rule of brainstorming is to:

In the 6-3-5 brainwriting method, each participant writes:

The TRIZ method of inventive problem solving was developed by:

In a weighted decision matrix with weights 0.5 and 0.5, an alternative scoring 6 and 8 has a weighted score of:

In a decision tree, a circle node represents:

An option has a 70% chance of Rs 100 profit and 30% chance of Rs 40 loss. Its expected monetary value is: