Steel pipe are
(A) Suitable for withstanding high internal pressure
(B) Connected by riveted or welded joints
(C) Generally laid underground and no expansion joint is required
(D) Likely to last 100 years under ordinary conditions
Description : The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the ... , is (A) 10 mm (B) 15 mm (C) 20 mm (D) 25 mm
Last Answer : (C) 20 mm
Description : Inspection of welded joints with respect to riveted joints is a. Difficult b. Easier c. Cannot say d. None
Last Answer : a. Difficult
Description : Welded structures with respect to riveted joint is a. Weakened in tension b. Strengthened in tension c. No change in tension strength d. None
Last Answer : c. No change in tension strength
Description : The strength of a welded joint with respect to a riveted joint is a. Greater b. Smaller c. Equal d. None
Last Answer : a. Greater
Description : Efficiency of a welded joint with respect to a riveted joint is a. Smaller b. Equal c. Greater
Last Answer : c. Greater
Description : The advantage of a welded joint over a riveted joint is (i) Introduce residual stresses (ii) Requires highly skilled labor and supervision (iii) Lighter in weight (iv) None
Last Answer : (iii) Lighter in weight
Description : Most commonly used joint in the underground pipe lines is the (A) Sleeve joint (B) Coupling (C) Flange (D) Expansion joint
Last Answer : (A) Sleeve joint
Description : Pick up the incorrect statement (A) The cross-sectional area of the welded member is effective (B) A welded joint develops strength of its parent metal (C) Welded joints provide rigidity (D) Welding takes more time than riveting
Last Answer : (D) Welding takes more time than riveting
Description : A pressure conduit laid underground, may not be subjected to (A) Internal pressure of water (B) Pressure due to external load (C) Longitudinal temperature stress (D) Longitudinal stresses due to unbalanced pressure to bends
Last Answer : (C) Longitudinal temperature stress
Description : Failure of riveted joints is due to (A) Tearing of the plates between the rivet hole and the edge of the plate (B) Tearing of plates between rivets (C) Shearing of rivets (D) All the above
Last Answer : (D) All the above
Description : Welded joints are a. Hinged joint b. Rigid joint c. Freely supported joint
Last Answer : b. Rigid joint
Description : Appearance of welded structures with respect to riveted structures is a. Smooth b. Rough c. Same d. None
Last Answer : a. Smooth
Description : Welded structures with to riveted structures for a certain load are a. Heavier b. Lighter c. Same weight d. None
Last Answer : b. Lighter
Description : The welded structure with respect to riveted structure is a. Heavier b. Lighter c. Same d. None
Description : State the four methods of laying of cable. State precautions while laying of underground cable in the situation : (i) Minimum clearance between cable and water pipe line when running in parallel. (ii) ... is to be laid in the same trench, what should be minimum spacing between two cables ?
Last Answer : (i) Minimum clearance between cable and water pipe line when running in parallel:- 0.5 mtr. (ii) Minimum clearance between cable and water pipe line when running in parallel:- 0.5 mtr ... should be minimum spacing between two cables :- Then minimum 30 cm spacing is provided between 2 cables
Description : When two plates butt together and are riveted with two cover plates with two rows of rivets, the joint is known as (A) Lap joint (B) Butt joint (C) Single riveted single cover butt joint (D) Double riveted double cover butt joint
Last Answer : (D) Double riveted double cover butt joint
Description : Plastic bitumen is generally used for (A) Road pavements (B) Expansion joints (C) Crack fillings (D) None to these
Last Answer : Answer: Option C
Description : Pick out the wrong statement. (A) For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1 (B) For calculating forces and ... Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm
Last Answer : Option B
Description : If d is the diameter of the pipe, p is the total internal pressure, f is the permissible tensile stress and n is the effective of the joint, the thickness t of metal pipe, is (A) n (pd/2f) (B) (1/n) (pd/2f) (C) (1/n) (pd/3f) (D) (1/n) (pf/d
Last Answer : (B) (1/n) (pd/2f)
Description : Disc compensators are provided in large diameter fuel gas carrying pipelines to (A) Keep the pipe in proper orientation (B) Make the pipe joint leak-proof (C) Account for contraction/expansion ... due to temperature changes of the surroundings (D) Account for the pressure variation side the pipeline
Last Answer : (C) Account for contraction/expansion of pipe due to temperature changes of the surroundings
Description : The diameter of a domestic sewer pipe laid at gradient 1 in 100 is recommended (A) 100 mm (B) 150 mm (C) 200 mm (D) 175 mm
Last Answer : (B) 150 mm
Description : Internal defects in a welded joint can be found by a process called (i) Tension test (ii) Visual inspection (iii) Radio graphing (iv) None
Last Answer : (iii) Radio graphing
Description : A welded rail joint is generally A. Support on a sleeper B. Sipport on a metel C. Suspended D. None of These
Last Answer : C [Suspended]
Description : Pick up the correct statement from the following: (A) A confined bed of impervious material laid over an aquifer, is known as an aquiclude (B) The top most water bearing strata having no aquifer, is ... water from the top most water bearing strata, are called water table wells (D) All the above
Last Answer : Answer: Option D
Description : In pumping stations, the type of joint generally used, is (A) Socket and spigot joint (B) Flanged joint (C) Expansion joint (D) Dresser coupling joint
Last Answer : (B) Flanged joint
Description : The objective of caulking in a riveted joint is to make the joint (A) Free from corrosion (B) Stronger in tension (C) Free from stress (D) Leak-proof
Last Answer : (D) Leak-proof
Description : The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times. (A) Two (B) Four (C) Six (D) Eight
Last Answer : Option A
Description : Lap welded joints used in circumferential joints because of ? i. High strength requirements ii. Low strength requirements iii. Low as well as high strength requirements
Last Answer : ii. Low strength requirements
Description : Why are butt welded joints longitudinal joints ? i. High strength requirements ii. Low strength requirements iii. Low as well as high strength requirements iv. None
Last Answer : i. High strength requirements
Description : Motor controller or starter contacts may become pitted and welded together if the contacts _____________. A. open under loaded conditions B. close slowly with light pressure C. open too quickly and arc D. close quickly with proportionate pressure
Last Answer : Answer: B
Description : Within the external combination engine, a piston rod is usually connected to the cross head by means of....... A. Cotter joints B. Universal joints C. Knuckle joint D. Bearing
Last Answer : A. Cotter joints
Description : In steam engine, the piston rod is usually connected to the cross head by means of a....... A. Cotter joints B. Universal joints C. Knuckle joint D. Bearing
Description : The maximum thickness of expansion joint in rigid pavements is (A) 0 (B) 25 mm (C) 50 mm (D) 100 mm
Last Answer : Answer: Option B
Description : Of the following statements, which best distinguishes ordinary negligence from gross negligence? a. The more material the undetected error the greater the likelihood of ordinary negligence. ... care denotes ordinary negligence, whereas failure to exercise minimal care indicates gross negligence
Last Answer : Failure to exercise reasonable care denotes ordinary negligence, whereas failure to exercise minimal care indicates gross negligence
Description : The angle of V-welded joint in a pressure vessel 30 to 45 0 40 to 55 0 55 to 70 0 None
Last Answer : 55 to 70 0
Description : Which welded joint used in the circumferential joint of a cylindrical pressure vessel is (i) Butt joint (ii) Lap joint (iii)Screwed joint (iv) None
Last Answer : (ii) Lap joint
Description : Welded joint used in the longitudinal joint of a cylindrical pressure vessel is (i) Butt joint (ii) Lap joint (iii)Screwed joint (iv) None
Last Answer : (i) Butt joint
Description : Lap welded joints are a. Rectangular b. Square c. Triangular d. None
Last Answer : c. Triangular
Description : Welded joints require a. Punching of holes b. Drilling of holes c. Punching & Drilling of holes d. None
Last Answer : d. None
Description : While calculating bending stress in the following welded joints which of the welds moment of inertia can be neglected? a) 1 b) None of the listed c) Both 1 & 3 d) Both 2 & 4
Last Answer : b) None of the listed
Description : Which type of joints is better when the product is subjected to large vibrations: welded or threaded? a) Welded b) Threaded c) Both have same results d) Depends on the magnitude of the vibrational force
Last Answer : a) Welded
Description : he transverse fillet welded joints are designed for (a) tensile strength (b) compressive strength (c) bending strength (d) shear strength
Last Answer : (a) tensile strength
Description : Pick out the wrong statement. (A) Longer tubes are less expensive per unit heat transfer area as compared to shorter tubes (B) A cost index is merely a number for a given year ... butt welded joints are less expensive compared to lap welded joints, because squaring of plates is not necessary
Last Answer : (D) Plates with butt welded joints are less expensive compared to lap welded joints, because squaring of plates is not necessary
Description : Magnetic controller contacts may become welded together during operating conditions as a result of _____________. A. high spring pressure B. high ambient temperature C. an open coil D. low voltage on operating coil
Last Answer : Answer: D
Description : Pick up the correct statement from the following: (A) Plastics have generally low melting point (B) The coefficient of thermal expansion of plastics is about three times than that of steel (C) ... fibre-glass with phenolic resins has absorption coefficient of about 0.67 (D) All the above
Description : Pick out the wrong statement. (A) Economy of a multiple effect evaporator is not influenced by the boiling point elevation (B) Two identical cubes of iron and copper will have the same heat ... in the field of refrigeration (D) Finned tube heat exchangers are suitable for heating air by steam
Last Answer : (B) Two identical cubes of iron and copper will have the same heat content under the same conditions of temperature
Description : In a pressure penstock 4500 m long, water is flowing at a velocity of 4 m/s. If the velocity of the pressure wave traveling in the pipe, due sudden complete closure of a valve at the downstream end, is ... period of oscillation in second under frictionless conditions? (a) 6 (b) 8 (c) 9 (d) 11
Last Answer : (a) 6
Description : According to IS Code , the requirement of an ordinary Portland cement is (a) The residue does not exceed 10% when sieved through is sieve no .9 (b) Its initial setting time is not less than 30 minutes. (c) its expansion is not morethan 10mm for unaerated cement (d) All the above.
Last Answer : (d) All the above.
Description : The external load per unit length of (A) A pipe laid on, or projecting above the undisturbed ground and covered with fills, is proportional to the square of the external diameter of the pipe ... fills, is proportional to the square of the width of the trench (D) All the above
Description : To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than (A) 2.4 m above the hydraulic gradient (B) 6.4 m above the hydraulic gradient (C) 10.0 m above the hydraulic gradient (D) 5.0 above the hydraulic gradient