Railway rails are normally made of_______________?

Related Mcqs:

1. Large forgings, crank shafts, axles normally contain carbon up to________________?

   A. 0.05 to 0.20%
   B. 0.20 to 0.45%
   C. 0.45 to 0.55%
   D. 0.55 to 1.0%
   E. 1.0 to 1.2%.

2. A cold chisel is made of_______________?

   A. mild steel
   B. cast iron
   C. H.S.S.
   D. high carbon
   E. german silver

3. Pure iron is the structure of_______________?

   A. ferrite
   B. pearlite
   C. anstenite
   D. ferrite and cementite
   E. ferrite and pearlite

4. Delta iron occurs at temperature of_______________?

   A. room temperature
   B. above melting point
   C. between 1400°C and 1539°C
   D. between 910°C and 1400°C
   E. none of the above

5. The number of electrons in 1 cm3 of metal would be of the order of_______________?

   A. 1010
   B. TO16
   C. 1022
   D. 1040
   E. 1052

6. The spark plug gap is normally maintained at________________?

   A. 0.1 to 0.2 mm
   B. 0.2 to 0.4 mm
   C. 0.45 to 0.6 mm
   D. 0.6 to 0.8 mm
   E. 0.8 to 1 mm

7. The efficiency of I.C. engines normally is of the order of_________________?

   A. 15-20%
   B. 20-25%
   C. 25-30%
   D. 30-35%
   E. 35-50%

8. The overall isothermal eiffciency of compressor is defined as the ratio of_______________?

   A. isothermal h.p. to the BHP of motor
   B. isothermal h.p. to adiabatic h.p.
   C. power to drive compressor to isothermal h.p.
   D. work to compress air isothermally to work for actual compression
   E. isothermal work to ideal work

9. Free surface of a liquid tends to contract to the smallest possible area due to force of_______________?

   A. surface tension
   B. viscosity
   C. friction
   D. cohesion
   E. adhesion

10. The following types of materials are usually the most ductile__________________?

    A. face-centred cubic lattice
    B. body-centred cubic lattice
    C. hexagonal close-packed lattice
    D. all of the above
    E. none of the above