AFCAT-EKT 2018 Quiz 12

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Question 1

In a particle motion, which option describes the motion of particle A with reference to particle B?

• Ar_A = r_B + r_A/B
• Bv_A = v_B + v_A/B
• Ca_A = a_B + a_A/B
• Dall of these

Question 2

For air with a relative humidity of 80%

• A the dry bulb temperature is less than the wet bulb temperature
• B the dew point temperature is less than wet bulb temperature
• C the dew point and wet bulb temperatures are equal
• D the dry bulb and dew point temperatures are equal

Question 3

Whirling speed of a shaft coincides with natural frequency of its.

• Alongitudinal vibration
• BTransverse vibration
• CTorsional vibration
• DCoupled bending torsional vibration

Question 4

Corosion resistance of steel increases by addition of

• AVandadium, aluminium
• BSulpher, phosphorus, lead
• CChromium and nickel
• DTugsten, molybdenum, vanadium, chromium

Question 5

Thermal diffusivity of a substance is

• AInversely proportional to thermal conductivity
• BDirectly proportional to thermal conductivity
• CDirectly proportional to the square of thermal conductivity
• DInversely proportional to the square of thermal conductivity

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