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Total Questions : 2607 | Page 88 of 261 pages
Question 871.

A ship with jet
propulsion draws water through inlet orifices at right angles to the
direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)


  1.    `(waV_r)/(g) (V_r + v)`
  2.    `(waV_r)/(g) (V_r - v)`
  3.    `(waV_r)/(g) (V_r + v)^2`
  4.    `(waV_r)/(g) (V_r - v)^2`
 Discuss Question
Answer: Option B. -> `(waV_r)/(g) (V_r - v)`


Question 872.
The unit discharge through the turbine is
  1.    `Q/sqrt(H)`
  2.    `Q/H`
  3.    `Q/H^(3//2)`
  4.    `Q/H^2`
 Discuss Question
Answer: Option A. -> `Q/sqrt(H)`


Question 873.

If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by


  1.    `H = H_g // H_f`
  2.    `H = H_g xx h_f`
  3.    `H = H_g + H_f`
  4.    `H = H_g - H_f`
 Discuss Question
Answer: Option D. -> `H = H_g - H_f`


Question 874.


The strength of a riveted joint is equal to


  1.    tearing strength of plate (Pt)
  2.    shearing strength of rivet (Ps)
  3.    crushing strength of rivet (Pc).
  4.    least value of Pt Ps and Pc
 Discuss Question
Answer: Option D. -> least value of Pt Ps and Pc


Question 875.


The angle of twist of shaft is



  1.    directly proportional to (shaft diameter)2.
  2.    inversely proportional to (shaft diameter)2.
  3.    directly proportional to (shaft diameter)4.
  4.    inversely proportional to (shaft diameter)4.
 Discuss Question
Answer: Option D. -> inversely proportional to (shaft diameter)4.


Question 876.


A compound
cylinder with inner radius 50 mm and outer radius 70 mm is made by
shrinking one cylinder on to the other cylinder, The junction radius is
60 mm and the junction pressure is 1.1 N/mm2. The maximum hoop stress developed in the inner cylinder is



  1.    3.6 N/mm2 compression
  2.    3.6 N/mm2 tension
  3.    7.2 N/mm2 compression
  4.    7.2 N/mm2 tension
 Discuss Question
Answer: Option C. -> 7.2 N/mm2 compression


Question 877.
 The modulus of elasticity for mild steel is approximately equal to
  1.    80 kN/mm2
  2.    100 kN/mm2
  3.    110 kN/mm2
  4.    210 kN/mm2
 Discuss Question
Answer: Option D. -> 210 kN/mm2

ramu `rightarrow^(ab)`



Question 878.


Which of the following statement is wrong for a connecting rod ?



  1.    The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy
  2.    If Ixx> 4 Iyy , the buckling will occur about Y-axis
  3.    If Ixx < 4 Iyy, the buckling will occur about X-axis
  4.    The most suitable section for the connecting rod is T-section
 Discuss Question
Answer: Option D. -> The most suitable section for the connecting rod is T-section


Question 879.

The efficiency of a riveted joint is equal to


  1.    Pt/P
  2.    Ps/P
  3.    Pc/P
  4.    least ofPt,PsandPc /p
 Discuss Question
Answer: Option D. -> least ofPt,PsandPc /p


Question 880.
 According to Indian standard specifications, a grey cast iron designated by 'FG 200' means that the
  1.    carbon content is 2%
  2.    maximum compressive strength is 200 N/mm2
  3.    minimum tensile strength is 200 N/mm2
  4.    maximum shear strength is 200 N/mm2
 Discuss Question
Answer: Option C. -> minimum tensile strength is 200 N/mm2


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