Mechanical SSC J.E Quiz-43

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Question 1

The unit of a following parameter is not m²/s

• AThermal diffusivity
• BKinematic viscosity
• CMass diffusivity
• DDynamic viscosity

Question 2

For a ductile material, toughness is a measure of

• Aresistance to scratching
• Bability to absorb energy up to fracture
• Cability to absorb energy till elastic limit
• Dresistance to indentation

Question 3

The laminar flow is characterized by Reynolds number which is

• AEqual to critical value
• BLess than the critical value
• CMore than the critical value
• DZero critical value

Question 4

What does the application of centrifugal air compressors lead to?

• ALarge frontal area of aircraft
• BHigher flow rate through the engine
• CHigher aircraft speed
• DLower frontal area of the aircraft

Question 5

Which of the following water turbines does not require a draft tube?

• APropeller turbine
• BPelton turbine
• CKaplan turbine
• DFrancis turbine

Question 6

Reaming is the operation of __________.

• Aenlarging the end of a hole cylindrically
• Bcone shaped enlargement of the end of a hole
• Csmoothing and squaring the surface around a hole
• Dsizing and finishing a hole

Question 7

A two-member truss PQR is supporting a load W. The axial forces in members PQ and QR are respectively

• A2W tensile and 3W compressive
• BW tensile and 2W compressive
• C3W compressive and 2W tensile
• D2W compressive and 3W tensile

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