Quiz: Mechanical Engineering 26 march 2020

Quiz: Mechanical Engineering
Exam: ISRO (TECHNICAL ASST.)
Topic: Miscellaneous

Each question carries 4 mark.
Negative marking: 1 mark
Time: 15 Minute

Q1. Iso-piestic process is also called
(a) Isothermal process
(b) Isochoric process
(c) Isobaric process
(d) Isometric process

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10

Q2. Ericsson Cycle consists of
(a) Two isochoric process and two isobars
(b) Two isothermal process and two isobars
(c) Two isochoric process and two isothermal process
(d) Two isochoric process and two isentropic process

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10
Q3. Nusselt number is
(a) (Conductive resistance/Convective resistance)
(b) (Convective resistance/Conductive resistance)
(c) Thermal conductivity /electrical conductivity
(d) None of these

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10
Q4. Scotch Yoke mechanism is used to generate
(a) Square roots
(b) Sine function
(c) Inversions
(d) Logarithms

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10

Q5. Two perfectly elastic spherical bodies of equal mass are at rest on a smooth horizontal table. One of the balls is given a velocity v and collide on other ball then the velocity of other ball will be
(a) v
(b)-v
(c) v/2
(d) v/4

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10
Q6. Vacuum is provided in which advanced process
(a) Laser beam welding process
(b) Electron beam welding process
(c) Ultrasonic machining process
(d) Abrasive jet machining process

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10
Q7. Duralumin is an alloy of
(a) Vanadium
(b) Aluminium
(c) Tungsten
(d) Iron

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10
Q8. Window AC has an expansion device named as
(a) Expansion valve
(b) Thermostatic valve
(c) Capillary tube
(d) Piston-cylinder

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10
Q9. An object weighs 40 N in air and 30 N, when submerged in water then specific gravity of body is
(a)4/3
(b)3/4
(c)4
(d)3

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10
Q10.Derivative of tanX with respect to X
(a) sec^2 X
(b) SecX.tanX
(c) cos^2 X
(d) cosec^2 X

L1Difficulty 3
QTags Mechanical
QCereator Paper Maker 10

Solutions

S1. Ans (c)
Sol. Constant pressure process is called isobaric process or iso-piestic process.
S2. Ans (b)
Sol. Ericsson cycle is shown below-

S3. Ans (a)
Sol. We know,

Nusselt No =hl/k=(l/k)/(1/h)=(Conductive Resistance)/(Convective Resistance)

S4. Ans (b)
Sol. Figure shown below is Scotch-Yoke mechanism which is used to convert rotary motion into reciprocating motion.

S5. Ans (a)
S6. Ans.(b)
Sol. Electron beam welding process is done in presence of vacuum to avoid scattering of e-

S7. Ans.(b)
Sol. Duralumin is an alloy, a trade name given to the earliest types of the age harden able aluminium alloys. It is an alloy made up of 90% aluminum,4% copper, 1% magnesium and 0.5% to 1% manganese.

S8. (c)
Sol. In window AC capillary tube is used as an expansion device as it is cost effective and simple.

S9. Ans.(c)
Sol. We know,
Buoyancy on body=weight of body in air-weight of body in water
=40-30
=10 N
specific gravity of solid body
=(density of body)/(density of standard liquid or water)
=(weight of body)/(buoyancy on body)
=40/10
=4

S10. Ans.(a)
Sol. Derivative of tanX=(d(tanX))/dX=sec^2 X

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