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  • Question

  • When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 are the temperatures of hot fluid at entry and exit point, and cold fluid has lower heat capacity rate as compared to hot fluid, then effectiveness of the heat exchanger is given by


  • Options
  • A. When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 a
  • B. When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 a
  • C. When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 a
  • D. When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 a

  • Correct Answer
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    • More questions

    • 1. A low wet bulb temperature indicates very __________ humidity.

    • Options
    • A. low
    • B. high
      • Discuss
    • 2. The coefficient of venturifiume, generally, lies between

    • Options
    • A. 0.3 to 0.45
    • B. 0.50 to 0.75
    • C. 0.75 to 0.95
    • D. 0.95 to 1.0
      • Discuss
    • 3. The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.

    • Options
    • A. more than
    • B. less than
    • C. same as
      • Discuss
    • 4. In order to balance the reciprocating masses,

    • Options
    • A. primary forces and couples must be balanced
    • B. secondary forces and couples must be balanced
    • C. both (a) and (b)
    • D. none of these
      • Discuss
    • 5. A twist drill is a

    • Options
    • A. side cutting tool
    • B. front cutting tool
    • C. end cutting tool
    • D. none of these
      • Discuss
    • 6. A petrol engine has compression ratio from

    • Options
    • A. 6 to 10
    • B. 10 to 15
    • C. 15 to 25
    • D. 25 to 40
      • Discuss
    • 7. The thermal efficiency of diesel engines on weak mixtures is

    • Options
    • A. unaffected
    • B. lower
    • C. higher
    • D. dependent on other factors
      • Discuss
    • 8. In electro-discharge machining, dielectric is used to

    • Options
    • A. help in the movement of the sparks
    • B. control the spark discharges
    • C. act as coolant
    • D. all of these
      • Discuss
    • 9. It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be

    • Options
    • A. 10 r.p.m.
    • B. 20 r.p.m.
    • C. 120 r.p.m.
    • D. 180 r.p.m.
      • Discuss
    • 10. Which of the following metal shrinks most from molten state to solid state?

    • Options
    • A. Cast iron
    • B. Cast steel
    • C. Brass
    • D. Admirality metal
      • Discuss

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