301. Surging phenomenon in centrifugal com-pressor depends on ___________________?
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A. pressure ratio

B. all of the above

C. change in load

D. k up wrong statement ?

E. stagnation pressure at the outlet

F. mass flow rate

302. In nuclear fission each neutron that causes fission releases_______________?
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A. more than one new neutrons

B. one new neutron

C. no new neutron

D. at least one new neutron

E. many-fold neutrons

303. Francis, Kaplan and propeller turbines fall under the category of___________________?
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A. Impulse turbines

B. Axial flow turbines

C. Reaction turbines

D. Mixed flow turbines

E. Reaction-cum-impulse turbines

304. For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred_________________?
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A. mixed flow

B. centrifugal

C. axial flow

D. none of the above

E. reciprocating

305. The maximum compression ratio in an actual single stage axial flow comperssor is of the order of________________?
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A. 1:02

B. 1:01

C. 1 : 1.2

D. 1:10

E. 1:05

306. The cold working of metals is carried out_________________?
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A. below the recrystallisation temperature

B. at any temperature

C. at the recrystallisation temperature

D. above the recrystallisation temperature

307. Indicator diagram of a reciprocating pump is a graph between________________?
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A. flow vs speed

B. pressure in cylinder vs swept volume

C. swept volume vs speed

D. flow vs swept volume

E. pressure vs speed

308. Efficiency of gas turbine is increased by________________ ?
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A. inter cooling

B. all of the above

C. reheating

D. adding a regenerator

E. none of the above

309. The compressor efficiecny is the__________________?
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A. isothermal H.P/indicated H.R

B. none Of the above

C. isothermal H.P./shaft H.R

D. total output/air input

E. compression work/motor input

310. Which of the following particles is the lightest__________________?
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A. neutron

B. proton

C. nucleus

D. electron

E. meson

311. Work ratio of a gas turbine plant is ratio of______________________?
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A. net work output and heat supplied

B. actual/heat drop and isentropic heat drop

C. net work output and work done by turbine

D. work done by turbine and net work output

E. work done by turbine and heat supplied

312. Impulse turbine is generally fitted______________________?
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A. about 2.5 m below the tail race to avoid cavitation

B. slightly below the tail race

C. about 2.5 m above the tail race to avoid cavitation

D. at the level of tail race

E. little above the tail race
313. Francis turbine is best suited for_____________________?
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A. all types of heads

B. low head installation up to 30 m

C. high head installation above 180 m

D. medium head application from 24 to 180 m

E. none of the above

314. Two coplanar couples having equal and opposite moments_________________?
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A. produce a couple and an unbalanced force

B. produce a moment of couple

C. balance each other

D. are equivalent

E. can not balance each other
315. The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to _________________?
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A. Wcos(a + )

B. Wtan(a-)

C. Wsin(a + )

D. W (sin a + cos ).

E. Wtan(a + )
316. Total heat is the heat required to__________________?
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A. change liquid into vapour

B. convert saturated steam into dry steam

C. change vapour into liquid

D. increase the temperature of a liquid or vapour

E. convert water into steam and superheat it
317. Each fission of U235 produces following number of fast neutrons per fission________________?
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A. 1 neutron

B. 1 neutrons

C. 1 2 neutrons

D. infinite

E. 2 neutrons
318. A single force and a couple acting in the same plane upon a rigid body_____________________?
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A. balance each other

B. produce moment of a couple

C. are equivalent

D. cannot balance each other

E. none of the above

319. The emissive power of a body depends upon its___________________?
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A. temperature

B. all of the above

C. physical nature

D. wave length

E. none of the above

320. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be__________________?
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A. 20 kg, ve sense

B. 20 kg, + ve sense

C. 10 kg, ve sense

D. 45 kg, + ve sense

E. 10 kg, + ve sense

321. According to Lamis theorem___________________?
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A. three forces acting at a point will be in equilibrium

B. ection by the sides of a triangle, taken in order, they will be in equilibrium

C. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

D. none of the above

E. three forces acting at a point can be represented by a triangle, each side being proportional to force

F. if three forces acting upon a particle are represented in magnitude and

322. In heat exchangers, degree of approach is defined as the difference between temperatures of________________?
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A. hot medium outlet and cold water outlet

B. hot medium inlet and outlet

C. cold water inlet and outlet

D. none of the above

E. hot medium outlet and cold water inlet

323. The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be________________?
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A. same

B. zero

C. more

D. less

E. negative, i.e. fuel would be generated

324. When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by ___________________?
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A. conduction

B. conduction and convection

C. convection and radiation

D. convection

E. radiation

325. Uranium-233 is produced__________________?
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A. as basic raw material

B. artificially

C. by neutron irradiation of thorium

D. in high capacity furnaces

E. by neutron irradiation of Uz

326. Heat transfer takes place as per ________________?
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A. first law of thermodynamic

B. Kirchoffs law E. Stefans law

C. second law of the thermodynamics

D. zeroth law of thermodynamics

327. Two plates spaced 150 mm apart are maintained at 1000C and 70C. The heat transfer will take place mainly by ___________________?
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A. forced convection

B. radiation

C. free convection

D. radiation and convection

E. convection

328. Pick up the wrong statement ?
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A. axial flow compressors have instability region of operation

B. axial flow compressors are more stable than centrifugal type compressors but not as efficient

C. axial flow compressors have high capacity and efficiency

D. large gas turbines employ axial flow compressors

E. centrifugal compressors are used mainly on low flow pressure ratio gas turbines

329. Angle of friction is the_______________________?
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A. the ratio of minimum friction force to the friction force acting when the body is just about to move

B. ratio of static and dynamic friction

C. the ratio of minimum friction force to friction force acting when the body is in motion

D. angle between normal reaction and the resultant of normal reaction and the limiting friction

E. ratio of limiting friction and normal reaction

330. Pick up the correct statement?
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A. gas turbine uses same working fluid over and over again

B. closed cycle gas turbine is an I.C engine

C. ideal efficiency of closed cycle gas turbine plant is more than carnot cycle efficiency

D. thrust in turbo-jet is produced by nozzle exit gases

E. air-fuel ratio in a gas turbine is 100 : 1

331. The concept of overall coefficient of heat transfer is used in case of heat transfer by________________?
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A. convection

B. convection and radiation

C. conduction

D. radiation

E. conduction and convection
332. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t 4), the acceleration of the particle will be given by the equation __________________?
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A. 6f-8

B. 6f-4

C. 3t2+2t

D. 3t2-lt

E. 6t2-8t

333. Half life of a radioactive isotope corresponds to the time required for half of the following to decay__________________?
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A. nulceus

B. electrons

C. neutrons

D. protons

E. atom
334. Thermal conductivity of a material may be defined as the________________?
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A. quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1C

B. none of the above

C. quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1C

D. heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

E. all of the above
335. Coulomb friction is the friction between _________________?
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A. solids and liquids

B. two lubricated surfaces

C. bodies having relative motion

D. two dry surfaces

E. electrically charged particles

336. The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?
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A. wavelength has nothing to do with it

B. none of the above

C. longer wavelength

D. remains same at all wavelengths

E. shorter wavelength
337. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to________________?
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A. Wtan(a +

B. W\an(a-)

C. W

D. W sin (a + $)

E. Wtana

338. A grey body is one whose absorptivity _________________?
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A. there is no such criterion

B. varies with both

C. does not vary with temperature and wave length of the incident ray

D. varies with the wave length of incident ray

E. varies with temperature

339. Reactors designed for propulsion applications are designed for_______________?
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A. natural uranium

B. enriched uranium

C. any type of uranium

D. none of the above

E. pure uranium

340. Which of the following property of air does not increase with rise in temperature ________________?
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A. thermal diffusivity

B. density

C. dynamic viscosity

D. kuiematic viscosity

E. thermal conductivity

341. A non-dimensional number generally associated with natural convection heat transfer is________________?
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A. Prandtl number

B. Nusselt number

C. Reynold number

D. Grashoff number

E. Weber number

342. Pressurised water reactor is designed________________?
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A. for boiling pi water in the core

B. to eliminate the coolant loop of the pressurised water

C. to prevent the water coolant from boiling in the core

D. to use liquid sodium metal as coolant

E. to use intermediate coolant

343. The size of the reactor is said to be critical when_________________?
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A. it becomes uncontrollable

B. it produces no power

C. it explodes

D. chain reaction can be initiated

E. it produces tremendous power

344. Pick up the wrong statement ?
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A. centrifugal compressors deliver prac-tically constant pressure over a considerable range of capacities

B. axial flow compressors apt to be longer as compared to centrifugal type

C. Axial flow compressors have a sub-stantially constant delivery at variable pressures

D. axial flow compressors are bigger in diameter compared to centrifugal type

E. centrifugal compressors have a wider stable operating range than axial flow compressors

345. Unit of thermal conductivity in M.K.S. units is ___________________?
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A. kcal-m/m2 C

B. kcal/kg m2 C

C. kcal-m/hr m2 C

D. kcal/hr m2 C

E. kcal-m/hr C

346. In ideal machines__________________?
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A. mechanical advantage is greater than velocity ratio

B. mechanical advantage is unity

C. mechanical advantage is equal to velocity ratio

D. mechanical advantage is less than velocity ratio

E. none of the above

347. Reactors for propulsion applications use_________________?
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A. natural uranium

B. any form of uranium

C. plutonium

D. thorium

E. molten lead
348. Ammonia-absorption refrigeration cycle requires__________________?
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A. maximum work input

B. nearly same work input as for vapour compression cycle

C. very little work input

D. none of the above

E. zero work input

349. The function of control rods in nuclear plants is to__________________?
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A. control absorption of neutron

B. control temperature

C. none of the above

D. readioactive pollution

E. control fuel consumption

350. The time constant of a thermocouple is_______________?
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A. the time taken to attain the final temperature to be measured

B. the time taken to attain 63.2% of the value of initial temperature difference

C. none of the above

D. the time taken to attain 50% of the value of initial temperature difference

E. determined by the time taken to reach 100C from 0C