What is the primary purpose of using a stress concentration factor (Kt) in fatigue analysis?

The correct answer is A: To account for geometric discontinuities. The stress concentration factor accounts for stress amplification due to geometric features like fillets, holes, and shoulders that create local stress rises.

In a siphon, the maximum theoretical height to which liquid can be lifted is limited by atmospheric pressure. For water at sea level (P_atm = 101.325 kPa), the theoretical maximum siphon height is:

The correct answer is B: 10.3 m. Maximum siphon height = P_atm/(ρg) = 101,325/(1000 × 9.81) ≈ 10.3 m. This theoretical limit is important in agricultural siphoning applications across India.

In a closed system, the total energy balance equation for a time interval is:

The correct answer is B: ΔE = Q - W. First Law: ΔE_system = Q - W, where Q is heat added to system and W is work done by system. This is the IUPAC convention.

A deep groove ball bearing is subjected to a radial load of 5 kN and an axial load of 2 kN. If the X and Y factors for this bearing are 0.56 and 1.8 respectively, what is the equivalent dynamic load?

The correct answer is C: 6.08 kN. Equivalent dynamic load P = X × Fr + Y × Fa = 0.56 × 5 + 1.8 × 2 = 2.8 + 3.6 = 6.4 kN (approximate)

In an Otto cycle, the compression ratio is 10 and γ = 1.4. Calculate the thermal efficiency.

The correct answer is B: 60.2%. Otto cycle efficiency = 1 - (1/r^(γ-1)) = 1 - (1/10^0.4) = 1 - (1/2.512) = 1 - 0.3981 = 0.602 ≈ 60.2%

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Mechanical Engineering
Machine Design

Thermodynamics, hydraulics, machine design

23 Q 3 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–23 of 23

Topics in Mechanical Engineering

All Thermodynamics 100 Fluid Mechanics 79 Machine Design 80

Q.21 Easy Machine Design

Which bearing type is most suitable for high-speed applications with moderate loads?

A Roller bearing

B Deep groove ball bearing

C Needle bearing

D Tapered roller bearing

Correct Answer: B. Deep groove ball bearing

EXPLANATION

Deep groove ball bearings are ideal for high-speed applications with moderate radial and axial loads due to their low friction and good precision.

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Q.22 Easy Machine Design

In gear design, what does the term 'Module' represent?

A Ratio of pitch diameter to number of teeth

B The pitch circle diameter

C The face width of the gear

D The pressure angle of teeth

Correct Answer: A. Ratio of pitch diameter to number of teeth

EXPLANATION

Module is defined as the ratio of pitch circle diameter to the number of teeth (m = D/N). It determines the size of the gear teeth.

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Q.23 Easy Machine Design

Which of the following is the primary function of a key in mechanical design?

A To prevent relative motion between shaft and hub

B To increase the strength of the shaft

C To reduce vibration in rotating machinery

D To facilitate heat dissipation

Correct Answer: A. To prevent relative motion between shaft and hub

EXPLANATION

A key is a mechanical element that prevents relative rotational motion between a shaft and a hub or pulley by transmitting torque.

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