Description : The piston pin bearings in heavy-duty diesel engines are (a) needle roller bearings (b) tapered roller bearings (c) spherical roller bearings (d) cylindrical roller bearings
Last Answer : (a) needle roller bearings
Description : Multi leaf springs are not recommended for automobile and rail road suspensions. a) True b) False
Last Answer : b) False
Description : Multi-leaf springs are used in (A) automobile suspension (B) railroad suspension (C) both (A) and (B) (D) none of the above
Last Answer : (C) both (A) and (B)
Description : _______is suitable as a lubricant for heavy-duty applications of rolling contact bearing. (a) Grease (b) Lubricating oil (c) Graphite (d) Air
Last Answer : (b) Lubricating oil
Description : Saddle key is more suitable than sunk key for heavy duty applications. a) True b) False
Description : Kennedy key is used in (A) Light duty applications (B) Heavy duty applications (C) High speed applications (D) Precision equipments
Last Answer : (B) Heavy duty applications
Description : Supercharging is essential in A. aircraft engines B. petrol engines C. gas turbines D. diesel engines
Last Answer : ANSWER : A
Description : Diesel engines are best suited for heavy vehicles, such as lorries, trucks, railway engines and ships. Why?
Last Answer : As they have more power and efficiency of diesel engine is more.
Description : A concentric spring consist of two helical compression springs (A) both springs always have right hand helix (B) both springs always have left hand helix (C) both springs always have opposite hand of helices (D) any of the above
Last Answer : (C) both springs always have opposite hand of helices
Description : Factor of safety in the design of springs is usually (A) 1.5 or less (B) 3 or less (C) 4.5 or less (D) 6 or less
Last Answer : (A) 1.5 or less
Description : For two springs in parallel, effective stiffness (k) is Where k 1 & k 2 are stiffness of springs 1 & 2 respectively (A) k 1 k 2 / (k 1 + k 2 ) (B) k 1 + k 2 (C) k 1 k 2 (D) (k 1 + k 2 ) / k 1 k 2
Last Answer : (B) k 1 + k 2
Description : For two springs in series, effective stiffness (k) is Where k 1 & k 2 are stiffness of springs 1 & 2 respectively (A) k 1 k 2 / (k 1 + k 2 ) (B) k 1 + k 2 (C) k 1 k 2 (D) (k 1 + k 2 ) / k 1 k 2
Last Answer : (A) k 1 k 2 / (k 1 + k 2 )
Description : The leaves of multi-leaf springs are subjected to (A) bending stress (B) shear stress (C) axial stress (D) all of the above
Last Answer : (A) bending stress
Description : In compression springs, the external force tends to (A) shorten the spring (B) lengthen the spring (C) both (A) and (C) (D) keep the length same
Last Answer : (A) shorten the spring
Description : Two springs of stiffness k1 and k2 are connected in series, the combined (A) k1k2/k1 + k2 (B) k1k2/k1 - k2 (C) k1 + k2 (D) k1 + k2/k1k2
Last Answer : (A) k1k2/k1 + k2
Description : The type of spring used to achieve greater load carrying capacity within given space is (A) Spiral spring (B) Springs in series (C) Multi-leaf spring (D) Concentric springs
Last Answer : (D) Concentric springs
Description : When two concentric springs are made of same material, having same free length and compressed equally by axial load, then the load shared by each spring is proportional to (A) Spring index of each spring ... spring (C) Mean coil diameter of each spring (D) Square of wire diameter of each spring
Last Answer : (D) Square of wire diameter of each spring
Description : Concentric springs are used, (A) To achieve greater load carrying capacity with given space (B) To achieve fail-safe system (C) To eliminate surge (D) Any of the above objectives
Last Answer : (D) Any of the above objectives
Description : Two springs of stiffness k1 and k2 are connected in parallel, the combined stiffness of the connection is given by, (A) k1k2/k1 + k2 (B) k1k2/k1 - k2 (C) k1 + k2 (D) k1 + k2/k1k2
Last Answer : (C) k1 + k2
Description : Springs are used, (A) To absorb shocks and vibrations (B) To store and release energy (C) To measure force (D) For any of the above functions
Last Answer : (D) For any of the above functions
Description : Wahl factor to account for direct shear stress and stress concentration due to curvature for helical springs is given by, (A) (4C - 1/4C - 4) + 0.615/C (B) (4C - 1/4C + 4) + 0.615/C (C) (4C + 1/4C - 4) + 0.615/C (D) (4C + 1/4C + 4) + 0.615/C
Last Answer : (A) (4C - 1/4C - 4) + 0.615/C
Description : When two Belleville springs are in parallel, half force is obtained for a given deflection. a) Half force b) Double force c) Same force d) Can’t be determined
Last Answer : b) Double force
Description : Can concentric springs be used to obtain a force which is not proportional to its deflection? a) True b) False
Last Answer : a) True
Description : In concentric springs, vibrations called surge are amplified. a) True b) False
Description : For two springs connected in parallel, net force is equal to the sum of force in each spring. a) True b) False
Description : For two springs connected in series, the net deflection is equal to the sum of deflection in two springs. a) True b) False
Description : Martin’s factor compensates for curvature effect in springs. a) True b) False
Description : Match List -I (Bearings) with List-II (Applications) and select the using the codes given below the lists: [IAS-1998] List -I List-II A. Journal bearing 1. Electric motors B. Thrust bearing 2. Watches C. Conical pivot bearing 3. Marine ... D (a) 3 4 1 2 (b) 4 2 1 3 (c) 3 4 2 1 (d) 4 2 3 1
Last Answer : (c) 3 4 2 1
Description : Consider the following pairs of types of bearings and applications: 1. Partial Journal bearing................... Rail wagon axles 2. Full journal bearing ......................Diesel engine crank-shaft 3. Radial bearing ... matched? [IES-2000] (a) 1 alone (b) 1 and 2 (c) 2 and 3 (d) 1, 2 and 3
Last Answer : (b) 1 and 2
Description : The bearings of heavy series have capacity __________ over the medium series. (a) 10 to 20% (b) 20 to 30% (c) 30 to 40% (d) 40 to 50%
Last Answer : (b) 20 to 30%
Description : Which one of the following bearing is intended for a very heavy radial load? (a) Ball bearing (b) Self-aligning roller bearing (c) Roller bearing (d) Thrust bearing
Last Answer : (b) Self-aligning roller bearing
Description : Which of the following isn’t the property of a taper roller bearing? (a) High rigidity (b) Easy dismantling (c) Take low radial and heavy loads (d) It is unsuitable for high speed applications
Last Answer : (c) Take low radial and heavy loads
Description : Deep groove ball bearings are used for (a) heavy thrust load only (b) the small angular displacement of shafts (c) radial load at high speed (d) combined thrust and radial loads at high speed
Last Answer : (d) combined thrust and radial loads at high speed
Description : The most suitable bearing for carrying very heavy loads with slow speed is (a) Hydrodynamic bearing (b) ball bearing [IAS 1994] (c) Roller bearing (d) hydrostatic bearing
Last Answer : (d) hydrostatic bearing
Description : A rolling contact bearing is specified as X307. Determine the series. a) Extra light series b) Light series c) Medium series d) Heavy series
Last Answer : c) Medium series
Description : Which of the following isn’t the property of taper roller? a) High rigidity b) Easy dismantling c) Take low radial and heavy loads d) All are the properties of tapper roller
Last Answer : c) Take low radial and heavy loads
Description : One which is applicable to a welded joint (i)Less rigidity (ii) Heavy (iii) Difficult process (iv) None
Last Answer : (iv) None
Description : Name a manufacturing centre for Engines for MIG aircraft. -SST 10th
Last Answer : (i) Engines for MIG air Craft—Koraput in Orissa. (ii) Diesel locomotives—Chittaranjan in West Bengal. (iii) Software—Bangalore in Karnataka.
Description : If so equipped, when should an aircraft display the anti-collision light? a. Only at night in flight, but not on the ground if being towed b. Whilst taxiing but not whilst being towed c. Only at night with engines running d. At all times on the ground when the engines are running
Last Answer : d. At all times on the ground when the engines are running
Description : Colloids (a) Are true solutions (b) Are suspensions of one phase in another (c) Are two-phase systems (d) Contain only water soluble substances
Last Answer : Ans:(c)
Description : Drugs in suspensions and semi-solid formulations always degrade by (A) first order kinetics (B)second order kinetics (C) zero order kinetics (D) non-linear kinetics
Last Answer : (C) zero order kinetics
Description : What is natural frequency of driver sheet suspensions a)0.5-1.5 Hz b)1.5-4.0 Hz c)4.0-6.0 Hz d)4.0-10 Hz
Last Answer : a)0.5-1.5 Hz
Description : Gels and Foams are classified as: w) solutions x) emulsions y) colloids z) suspensions
Last Answer : ANSWER: C -- COLLOIDS
Description : Name the effect that is caused by scattering of light in colloids or suspensions.
Last Answer : ANSWER: TYNDALL EFFECT
Description : Are diesel engines more efficient? If so why?
Last Answer : answer:From Wikipedia : Diesel engines often achieve greater fuel efficiency than petrol (gasoline) engines. Diesel engines have energy efficiency of 45% and petrol engines of 30%.[3] That is one of ... high as 25:1. The higher compression ratio of the diesel engine leads to better efficiency.
Description : Are diesel engines better than gas engines?
Last Answer : Are diesel engines better than gas engines is sort of a yes and no question. Diesel engines generally get better fuel mileage and last longer overall. But, gas engines are easier to maintain on your own and gasoline is much more readily available than diesel fuel is on the whole.
Description : Are Mazda cars available in diesel or gas engines?
Last Answer : Mazda cars require gas for their engines, not diesel. They also have hybrid vehicles, which run on both electricity and gas, but not diesel.
Description : Why do diesel fuel truck engines seem to last longer?
Last Answer : The primary reason these engines last longer is the nature of diesel fuel as a lubricant. In addition, these engines typically operate at lower revolutions per minute, further extending their life.