RRB Junior Engineer Mechanical Engineering Model Question Papers

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RRB Junior Engineer Examination


1. The wastage of material in the store is taken into account by the following method in the evaluation of the material issued from the store
(a) inflated system
(b) primary cost method
(c) current value method
(d) fixed price method
(e) variable price method.

2. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at
(a) a temperature of - 273.16°C
(b) a temperature of 0°C
(c) a temperature of 273 °K
(d) a negative pressure and 0°C temperature
(e) can't be attained.

3. The output of a diesel engine can be increased without increasing the engine revolution or size in following way
(a) feeding more fuel
(b) increasing flywheel size
(c) heating incoming air
(d) scavenging
(e) supercharging.

4. Pick up the wrong statement
(a) In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.
(b) Slow or thermal neutrons have energy of the order or 0.025 eV
(c) Fast neutrons have energies above 1000 eV
(d) Fast reactor uses moderator
(e) Most serious drawback in using water as coolant in nuclear plants is its high vapor pressure.

5. If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to
(a) Ps-Pa
(b) pa-ps
(C) Pa+P,

6. The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature
(a) 0.1%
(b) 0.5%
(c) 1%
(d) 5%
(e ) 10%

7. In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
(a) convection
(b) radiation
(c) conduction
(d) both convection and conduction
(e) none of the above.

8. The condensing pressure due to the presence of non condemnable gases, as compared to that actually required for condensing temperatures without non condemnable gases,
(a) will be higher
(b) will be lower
(c) will remain unaffected
(d) may be higher or lower depending upon the nature of non condemnable gases
(e) unpredictable.

9. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is
(a) 400 kg/cm2
(b) 4000 kg/cm2
(c) 40 x 105 kg/cm2
(d) 40 x 106 kg/cm2
(e) none of the above.

10. The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called
(a) longitudinal stress
(b) hoop stress
(c) yeiled stress
(d) ultimate stress
(e) none of the above.

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