Multiple Choice Questions Mock Drill Test RRB SSE/JE 2015 Series I

By Global Rail Network on July 12, 2015

Last updated on July 14th, 2015 at 05:53 am

Mock drill is necessary to check your preparation at intervals to take corrective action in time before it is too late. Here are series of mock drill questions as per the syllabus prescribed for the forthcoming examination by RRB for the recruitment of SSE/JE.

This is a set of multiple choice questions as per the syllabus of SSE/JE examination 2015

Sr No	Question	Answer	Remarks
1	The materials ability to stretch into a wire is due to the behaviour of	Ductility	In material science, ductility is solid materials ability to deform under tensile stress and malleability is under compressive stress. Brittleness is when the material does not have any ability to absorb energy and simply breaks down without significant deformation. Plasticity is a deformation of material for non-reversible change of shape when force is applied.
2	Specific heat is defined as the heat required to raise the	temperature of 1 Kg by one degree centigrade	Q=mCT where m is mass in Kg, C is specific heat and T is rise in temperature.
3	Least count is defined as the	least distance which can be measured by an instrument
4	Which material will be added in the steel to get the property of toughness, hardness and resistance to wear	Tungston	Carbon is natural alloying material for making steel and tungston is added to get the propoerty of toughness.
5	Line to Line voltage in a star connected motor is 230V. What is voltage across the winding?	230/√3	230V is appearing across two winding having a phase difference of 120 degree
6	The two gases you will choose for MIG welding process are	Argon and Carbon Dioxide
7	A pressure gauze is mentioned with range of 0-10 bar and inaccuracy of plus/minus 1% to full scale deflection. What is the range of value when measured 5 bar?	4.95-5.05 bar
8	The materials ability to deform and form a thin sheet during hammering is due to the behaviour of	Malleability	In material science, ductility is solid materials ability to deform under tensile stress and malleability is under compressive stress. Brittleness is when the material does not have any ability to absorb energy and simply breaks down without significant deformation. Plasticity is a deformation of material for non-reversible change of shape when force is applied.
9	The substance which has low specific heat will heat	no effect	Lower specific heat means the substance does not have capacity to hold the heat and it raises the temperature in turn.
10	A machine in which the object moves in a horizontal plane and cutting tool remains fixed is called	planer	Object is fixed in shaper and moves in planer. It is rotating in late. The tool rotates in milling machine and the tool moves in vertical direction to axis of rotation
11	Stainless steel is an alloy made using	Chromium	Stainless steel is widely used as it does not rust. It uses minimum 10.5% Cr and Nickel. For harsh environment, more percentage of Cr is used.
12	n resistances of R ohms each are connected in parallel, the net resistance will be	R/n
13	Most of the ceramics are	Brittle material	Brittle materials are those breaks with the application of tensile stress. These materials does not exhibits any elasticity.
14	The ratio of the specific heat of gas at constant pressure and constant volume for the same is always	greater than one	The difference between the specific heat at constant pressure and volume is equal to R called gas constant therefore the ratio is more than one.
15	Which hardness tester uses a steel-ball indenter?	Brinell Hardness Tester
16	How stainless steel does not rust?	a layer of Cr₂O₃ formed on the surface to prevent further oxidation	The chromium forms a passivation layer of chromium(III) oxide (Cr2O3) when exposed to oxygen. The layer is too thin to be visible, and the metal remains lustrous and smooth. The layer is impervious to water and air, protecting the metal beneath, and this layer quickly reforms when the surface is scratched.
17	Tri-vector energy meter is device which measures	Measurement of three vectors of energy i.e. kVA, kVAh, kW	In three phase circuits, voltage, current and energy is vectorial sum. The constitunts of energy vector is Reactive Power (kVAh), Active Power (kW) and Apparent power (kVA).
18	TIG uses which welding metal?	Tungston	TIG stands for Tungston Inert Gas similarly MIG stands for Metal Inert Gas proces
19	Density of metal is directly proportional to	Constant	Density is a ratio of Mass and Volume and always constant and represents physical property of materials.
20	Two Copper wires A and B of length L and 2L, Area of cross-section A and 2A are heated by 50°C for one hour, the ratio of change of resistance A/B will be	1	ΔR=RαΔT; Now R=ρ*L/A and will same for both the wires therefore, ΔR will also be same. Ratio is one
21	What instrument will be used to check the health of a diode	Multimeter	Multimeter is having in built voltage source which will conduct In one direction and not in another direction to confirm the health of the diode.
22	What is the main constituent of Babbit alloy?	Tin	The most common alloy of babbit is 86% Tin, 7% Copper and 7% Antimony
23	Time of the Day energy meter called TOD helps in	generating more revenue for the power company	The primary function is to control the maximum demand but indirectly it also helps in generating more revenue for the company.
24	Hardening of steel is achieved by	heating to an appropriate temperature and than quenching in water or oil	Remember that Hardening is quick cooling, Annealing is very slow cooling and Normalizing is keeping it at that temperature for some time and than cooling in the air.
25	Which material has the minimum coefficient of thermal resistance	Aluminium	The coefficient of thermal resistance are Al=3.810¯³; Cu=4.2910¯³; Iron=6.4110¯³; Hg=8.910¯³
26	The largest piece of the material that can be taken for turning on a lathe machine is decided based on the	bed length minus the length of head and tail stock
27	Brass alloy is made of the material called	Cu and Zn
28	How the units of energy kVAh and kW are related together?	kW/kVAh=pF	Always remember that pF is less than unity and kVAh more than kW
29	Annealing of steel is achieved by	heating to an appropriate temperature and than slowly cooling in the air	Remember that Hardening is quick cooling, Annealing is very slow cooling and Normalizing is keeping it at that temperature for some time and than cooling in the air.
30	With increasing temperature, the conductivity of Copper will keep on	reducing	Conductivity is inverse of resistance. With increasing temperature, resistance increases therefore conductivity reduces.
31	The wave used by Ultrasound flaw detectors is	sound waves
32	Bronze alloy is made of the material called	Cu and Tin
33	Synchronous Condenser is a device used in power system	is a synchronous motor with overexcited field winding working on no load and producing leading current	Synchronous motor is an induction motor which works at synchronous speed with no load losses met by the field winding provided at the rotor. It does not have self starting properties and thus requires small motor at the same shaft to start it. Before the advent of power control devices, it was used only as synchronous condenser but now having application in traction as well.
34	Normalizing of steel is achieved by	heating to an appropriate temperature and than kept at that temperature for some time and cooling slowly thereafter	Remember that Hardening is quick cooling, Annealing is very slow cooling and Normalizing is keeping it at that temperature for some time and than cooling in the air.
35	Which material has the negative coefficient of thermal resistivity?	Carbon	Carbon has the coefficient of thermal resistivity as (-4.8*10¯⁴)
36	The coolent lubricant used while machineing cast iron object is generally	None	Cast iron and brass are machined dry,
37	Spring steel is an alloy of steel with	Silicon
38	In a state the utility charges on kVA with load more than 10 kW. A household having maximum demand of 12 kW during day time with pF of 0.8 installs fixed capacitor to improve power factor to 0.95. The load reduces during night time to 1 kW at pF of 0.8. How will his energy meter reading changes?	it may read 1 kW at much less than 0.8 pF	With capacitive current remaining constant throughout the day, the compensation will also keep on changing. When Load is much less, the vectorial sum of load current at pf of 0.8 lagging and 1.0 leading will become very load leading and kVA will still be drawn through the meter thus increasing the bill. It is desirable to switch the cpacitor bank during night time. Read more on http://www.nct-tech.edu.lk/Download/Technology%20Zone/Power%20Factor%20Improvement..pdf
39	The process of Tempering is done	after hardening process	Tempering process involves heating steel that has been quenched and hardened by heating to a certain temperature and bring in ductility in the material.
40	What material is used for armouring of a single phase single core Al conductor cable?	Aluminium	Non-magnetic material is required as otherwise it will induce emf in the armour treating it as secondary of a transformer
41	Multipoint tools are used in machines such as	Drilling	Multipoint tools are generally used in Drilling and Milling machines
42	The properties of any cutting tool not important in its selection process is	less friction	The material in cutting is removed by shear deformation and not rubbing. Only in grinding, the material is removed by surface fricition.
43	The process of normalizing is necessary to improve the	mach inability	Normalizing is performed on materials subjected to machining.
44	Highly elastic material has	low modulous and high elastic limit	Modulus is force applied per unit area and elastic limit is the change in length per unit length.
45	The most expensive cutting tools is	Cubic Boron Nitride	The most expensive tools are diamond, Cubic Boron Nitride and Cast Cobalt Alloy
46	Specific Gravity of Mercury is 13.628, than its density in Kg/m³ is	13628	Density is given as Kg/m³ whereas specific gravity is the ratio of density of mercury with reference to water and therefore, to be given as 13628/1000=13.628.
47	Two steel rod A and B of length L and 2L, area of crossection A and 2A are heated by 50°C for one hour, the ratio of increase in length A/B will be	0.5	ΔL=LαΔT; The length of B is 2L therefore will have increase to 2ΔL. The ratio will be 1/2. Area of crossection has no effect.
48	The grinding wheel characteristics which determines the wheel speed, depth of cut and feed rate is	Wheel Grade	There are five characteristics material, grain size, wheel grade, grain spacing, and bond type of which wheel grade determines how tightly the bond holds the abrasive and responsible for fixing the grinding work.
49	The grinding material used in grinding wheel for low tensile strength steel is generally	Silicon Carbide	Silicon Carbide:Ideal for materials with low tensile strength, like cast iron and also non-ferrous and non metallic materials. Aluminium Oxide : Best suited for alloy,carbon & high speed steel all with high tensile strength. For more details visit http://www.mmsonline.com/articles/choosing-the-right-grinding-wheel
50	This is not a conventional abrasives used in grinding wheel	Cubic Boron Nitride	Cubic Boron Nitride and Diamond are superabrasive and non-conventional for specific application. For more details visit http://www.mmsonline.com/articles/choosing-the-right-grinding-wheel

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