301-350

Question 1

301. A material best suited for manufacturing of fuse wire

A. Aluminum
B. Silver
C. Lead
D. Copper

Answer 1

B. Silver

Question 2

302. The laminations are made from

A. Low carbon steel
B. Silicon sheet steel
C. Nickel alloy steel stays
D. Chrome steel sheets

Answer 2

B. Silicon sheet steel

Question 3

303. Which of the following metals gets deposited to provide an undercut for chromium?

A. Copper
B. Silver
C. Bronze
D. Lead

Answer 3

C. Bronze

Question 4

304. In nickel-iron cell, the electrolyte is:

A. Dilute sulphuric acid
B. Dilute potassium hydroxide
C. Dilute sodium ammonium hydroxide
D. Dilute sodium chloride solution

Answer 4

B. Dilute potassium hydroxide

Question 5

305. Which of the following is not a primary cess?

A. Carbon zinc
B. Silver oxide
C. Silver zinc
D. Nickel – cadmium

Answer 5

C. Silver zinc

Question 6

306. Select from the conductors below that has the least electrical conductivity

A. Lead
B. Tin
C. Zinc
D. Aluminum

Answer 6

A. Lead

Question 7

307. The material used for commutator brushes is mostly

A. Copper
B. Mica
C. Carbon
D. Cast iron

Answer 7

C. Carbon

Question 8

308. Generally, the material for thermocouple is

A. Chrome copel
B. Chrome alumei
C. Platinum rhodium
D. Any of these

Answer 8

B. Chrome alumei

Question 9

309. Select the best conductor of electricity

A. Carbon
B. Silver
C. Copper
D. Iron

Answer 9

A. Carbon

Question 10

310. Any heating and cooling of steel that produces a rounded or globular form of carbide.

A. Spheroidizing
B. Malleability
C. Graphizing
D. Normalizing

Answer 10

A. Spheroidizing

Question 11

311. Steel that has been hammered rolled or drawn in the process of electricity

A. Wrought steel
B. Rimmed Steel
C. Killed steel
D. Stainless steel

Answer 11

B. Rimmed Steel

Question 12

312. Which of the following improves red hardness?

A. Boron
B. Cobalt
C. Copper
D. Columbium

Answer 12

A. Boron

Question 13

313. An alloy of nickel and copper

A. Monel
B. Inconel
C. Titanium
D. Vanadium

Answer 13

C. Titanium

Question 14

314. Commutator segments are made of

A. Zinc
B. Brass
C. Copper
D. Nickel

Answer 14

C. Copper

Question 15

315. What are the most commonly used materials as photo cathode for the photoelectric emission?

A. Barium and calcium
B. Cesium and rubidium
C. Arsenic and boron
D. Thorium and tungsten

Answer 15

A. Barium and calcium

Question 16

316. Manganese is an alloy of

A. Copper, manganese and nickel
B. Copper, aluminum and chromium
C. Copper, zinc and lead
D. Copper, chromium and cadmium

Answer 16

B. Copper, aluminum and chromium

Question 17

317. The one that is an acceptor impurity element

A. Antimony
B. Gallium
C. Arsenic
D. Phosphorus

Answer 17

D. Phosphorus

Question 18

318. Which of the following is not a method of non-destructive testing of steel castings and forging?

A. Radiography
B. Magnetic particle
C. Ultrasonic
D. Chemical analysis

Answer 18

D. Chemical analysis

Question 19

319. All of the following statements about rusting of iron are correct, except:

A. Contact with water and oxygen are necessary for rusting to occur
B. Contact with a more electropositive metal reduces rusting
C. Halides aggravate rusting process which involves electrochemical oxidation reduction reaction
D. Pitting occurs in oxygen-rich anodic areas and the rust is deposited nearby

Answer 19

D. Pitting occurs in oxygen-rich anodic areas and the rust is deposited nearby

Question 20

320. If 1080 steel is annealed by very slow cooling from 1000 C to ambient temperature, its microstructure will consist almost solely of:

A. Austenite
B. Bainite
C. Cementite
D. Pearlite

Answer 20

A. Austenite

Question 21

321. Steel can be strengthened by all of the following practices, EXCEPT:

A. Annealing
B. Quenching and tempering
C. Work hardening
D. Grain refinement

Answer 21

A. Annealing

Question 22

322. Intrinsic silicon becomes extrinsically conductive, with electrons as majority carriers when adopted with which of the following?

A. Antimony
B. Boron
C. Germanium
D. Aluminum

Answer 22

D. Aluminum

Question 23

323. The linear portion of the stress-strain diagram of steel is known as the:

A. Modulus of elasticity
B. Plasticity
C. Irreversible range
D. Elastic range

Answer 23

B. Plasticity

Question 24

324. Imperfections within metallic crystal structures may be all of the following. EXCEPT:

A. Lattice vacancies or extra interstitial atom
B. Ion pairs missing in ionic crystals
C. Displacement of atoms of interstitial sites
D. Linear defects or slippage dislocations caused by shear

Answer 24

B. Ion pairs missing in ionic crystals

Question 25

325. When a metal is cold worked, all of the following generally occur, EXCEPT: A. Ductility decreases B. Grains become equal-axed C. Tensile strength increases D. Slip or twinning occurs

Answer 25

C. Tensile strength increases

Question 26

326. Hard water is water, which contains soluble salts of which of the following elements? A. Sodium B. Sulfur C. Calcium D. Chlorine

Answer 26

A. Sodium

Question 27

327. Which of the following metals has the highest specific heat capacity at 100C? A. Aluminum B. Bismuth C. Copper D. Iron

Answer 27

B. Bismuth

Question 28

328. Aluminum pistons are either cast or A. Ground B. Forged C. Pressed D. Welded

Answer 28

A. Ground

Question 29

329. Valves and piping in an ammonia system are made of A. Iron B. Bras C. Copper D. Bronze

Answer 29

D. Bronze

Question 30

330. Which of the following gasket materials should be used on a Freon system? A. Metallic B. Asbestos C. Rubber D. A and B

Answer 30

D. A and B

Question 31

331. The nonferrous alloy corrodes in ammonia is A. Copper B. Bronze C. Brass D. All of these

Answer 31

C. Brass

Question 32

332. What is used in main condenser to control electrolysis? A. Brass plate B. Aluminum plates C. Zinc plates D. Bronze plate

Answer 32

D. Bronze plate

Question 33

333. Which of the following types of packing would be used on steam points? A. Asbestos B. Neoprene C. Metallic D. A or C

Answer 33

A. Asbestos

Question 34

334. The process applied to iron pipe, which retards corrosion A. Galvanizing B. Annealing C. Soldering D. Tinning

Answer 34

C. Soldering

Question 35

335. A scriber is made from what steel? A. Carbon steel B. Cold rolled steel C. Tool steel D. Hot-rolled steel

Answer 35

C. Tool steel

Question 36

335. For saturated air, the value of dry bulb, wet bulb and dew point temperature is a. Proportional b. inversely proportional c. the same d. unity

Answer 36

c. the same

Question 37

336. The least number of compressors in a multi-stage system is a. 4 b. 3 c. 2 d. 1

Answer 37

c. 2

Question 38

337. The refrigerant control that guards the compressor from overloading brought about by an increased loads in the evaporator due to defrosting, warm products and others is called: a. safety valve b. suction valve c. solenoid valve d. expansion valve

Answer 38

d. expansion valve

Question 39

338. The latent heat of heat of air is a function of dew point temperature and sensible heat is a function of the: a. wet bulb temperature b. critical point c. dry bulb temperature d. dew point temperature

Answer 39

c. dry bulb temperature

Question 40

339. Ice cubes were added to a glass of water and stirred. Moisture stars to condense at the outer surface of the glass, what is the temperature of the moisture at the outer surface? a. critical temperature b. surface temperature c. dew point temperature d. saturation temperature

Answer 40

c. dew point temperature

Question 41

340. The force when applied to a mass of one kilogram at an acceleration of one meter per second per second is: a. Watt b. Joule c. Newton d. Pascal

Answer 41

c. Newton

Question 42

341. The size of the reciprocating pump is stamped on the builder's plate as 3 x 4 x 6. The diameter of the liquid cylinder is: a. 3 inches b. 5 inches c. 4 inches d. 6 inches

Answer 42

c. 4 inches

Question 43

342. Which of the following is a type of condenser? a. shell-and-tube evaporator b. evaporative c. 3-phase motor d. cooling tower

Answer 43

b. evaporative

Question 44

343. If the pressure exerted on a liquid is higher than the saturation pressure corresponding on its temperature, the liquid is at the __________ region. a. saturated liquid b. superheated liquid c. subcooled liquid d. highly superheated liquid

Answer 44

c. subcooled liquid

Question 45

344. The mass and temperature of a gas are inversely proportional at a constant pressure process. This is known as: a. Dalton's law b. law of buoyancy c. Charles law d. Newton's second law

Answer 45

c. Charles law

Question 46

345. What will happen when the pressure at any point in a centrifugal pump goes below the vapor pressure corresponding to the temperature of the liquid? a. turbulent flow b. laminar flow c. cavitation d. priming

Answer 46

c. cavitation

Question 47

346. Cavitation is a phenomenon, which occurs in a __________ pump only. a. centrifugal b. rotary c. reciprocating d. centrifugal and reciprocating

Answer 47

a. centrifugal

Question 48

347. Which of the following is/are the effects of cavitation? a. pitting due to chemical reaction between gases and metal b. noise accomplishing the collapse of the vapor bubbles c. all of these d. decreased in capacity and vibration of the pump

Answer 48

c. all of these

Question 49

348. If Eg is the enthalpy of saturated vapor and Ef is the enthalpy of the saturated liquid. What is the expression for the heat of vaporization? a. Eg b. Eg – Ef c. Ef d. Ef/Eg

Answer 49

b. Eg – Ef

Question 50

349. A Carnot refrigerator operates between two reservoirs. One reservoir is at a higher temperature, T, and the other is at a cooler temperature, t. What is the coefficient of performance, COP, of the refrigerator? a. T/t b. 1-t/T c. t/T-1 d. t(T-1)

Answer 50

d. t(T-1)

Question 51

350. If the discharge heads are far below the pump's calibrated head at peak efficiency, cavitation will a. not occur b. occur c. may occur and may not occur d. sometimes occur and sometimes not

Answer 51

b. occur