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RRB JE Stage II : Mechanical Engineering Quiz | 27th August

Dear aspirants,

RRB JE Stage II exam is scheduled to be conducted from 28th August to 1st September 2019. The overall merit for the selection will be made on the basis of the marks scored in stage II, so candidates need to prepare thoroughly for the second stage. To help the aspirants, Adda247 has come up with a study plan in which we will provide you daily quizzes of all technical subjects. The below quiz will be helpful for the candidates who opted Mechanical as the exam group in RRB JE stage II.

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Q1. If the principal stresses and maximum shearing stresses are of equal numerical value at a point in a stressed body, the state of stress can be termed as
(a) Isotropic
(b) Uni-axial
(c) Pure shear
(d) Generalized plane state of stress

Q2. The diameter of shaft A is twice the diameter of shaft B and both are made of the same material. Assuming both the shafts to rotate at the same speed, the maximum power transmitted by B is its maximum shear stress in both shafts remains the same
(a) The same as that of A
(b) Half of A
(c) 1/8th of A
(d) 1/4th of A

S2. Ans.(a)
Sol.
The commonly used technique of strengthening thin pressure vessels is wire winding.
The wire is wound under tension, thus putting the walls of the cylinder under compression. This way, the cylinder is prestressed

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Q3. In an orthogonal turning process the chip thickness = 0.32 mm, feed = 0.2 mm/rev. Then the cutting ratio will be
(a) 2.6
(b) 3.2
(c) 1.6
(d) 1.8

Q4. What is the process of removing metal by a milling cutter which is rotated against the direction of travel of the work piece, called ?
(a) Down milling
(b) Up milling
(c) End milling
(d) Face milling

S4. Ans.(b)
Sol. Up milling : when cutting and feed motion are in opposite direction then it is called up milling. It is safer than down milling.
Down milling: When cutting and feed motion are in same direction then it is called down milling. In down milling there is tendency of the job being dragged into the cutter. Hence it is not safer than up milling. However down milling results in better surface finish and longer tool life.

Q5. What is the phenomenon of progressive extension of the material i.e. strain increasing with the time at a constant load, called ?
(a) Plasticity
(b) Yielding
(c) Creeping
(d) Breaking

S5. Ans.(c)
Sol. When metals are subjected to constant loads, metals tends to deform continuously. This continuous deformation of metals under constant loads is called as creep.

Q6. In which one of the following welding techniques is vacuum environment required?
(a) Ultrasonic welding
(b) Laser beam welding
(c) plasma arc welding
(d) electron beam welding

S6. Ans.(d)
Sol. If the electron beam welding is not done in the vacuum then in the electrons will have a impact with the air particles and they will loss their velocity and the kinetic energy.

Q7. In inventory control theory, the Economic Order Quantity (EOQ) is
(a) average level of inventory
(b) optimum lot size
(c) lot size corresponding to break-even analysis
(d) capacity of a warehouse

S7. Ans.(b)
Sol. Economic Order Quantity (EOQ) is that size of order which minimizes total annual cost of carrying inventory and cost of ordering under the assumed conditions of certainty and that annual demands.

Q8. The capillary rise or depression in a small diameter tube is
(a) directly proportional to the specific weight of the fluid
(b) inversely proportional to the surface tension
(c) inversely proportional to the diameter
(d) directly proportional to the surface area

Q9. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant–
(a) pressure
(b) temperature
(c) volume
(d) internal energy

S9. Ans.(a)
Sol.
Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant pressure.
dQ = dU + PdV
= dU + d(PV) (As P = const.)
= d(U + PV)
= dH

Q10. Heat is mainly transferred by conduction, convection and radiation in
(a) insulated pipes carrying hot water
(b) refrigerator freezer coil
(c) boiler furnaces
(d) condensation of steam in a condenser

S10. Ans (c)
Sol. Because for radiation to be comparable the magnitude of temperature difference should be large enough. Convection & conduction is also predominant in boiler furnace.

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