Description : For four stroke engine, work done/cycle is (where T m is the mean torque) (A) πT m (B) 2πT m (C) 3πT m (D) 4πT m
Last Answer : (D) 4πT m
Description : The bending moment ‘M’ and a torque ‘T’ is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then ‘M’ is equal to (A) T/2 (B) T (C) 2 T (D) 4 T
Last Answer : (A) T/2
Description : A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and height of the key being 14mm and 80mm respectively. Find the compressive stress induced in the key. a) 70.1 N/mm2 b) 51.6N/mm2 c) 45.5N/mm2 d) None of the listed
Last Answer : b) 51.6N/mm2
Description : A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and breadth of the key being 14mm and 80mm respectively. Find the shear stress induced in the key. a) 30.2N/mm2 b) 25.8N/mm2 c) 34.4N/mm2 d) None of the listed
Last Answer : b) 25.8N/mm2
Description : Calculate the force acting on the each pin in flexible coupling if torque transmitted is 397N-m and PCD=120mm with number of pins 6. a) 1400.3N b) 1102.8N c) 1320.3N d) None of the listed
Last Answer : b) 1102.8N
Description : If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the diameter of each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. Permissible tensile stress is 80N/mm2. a) 27mm b) 25mm c) 23mm d) 21mm
Last Answer : a) 27mm
Description : If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the tensile force on each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. a) 51234.4N b) 45968.3N c) 41666.7N d) None of the listed
Last Answer : c) 41666.7N
Description : A flywheel is used 1. to limit the fluctuation of speed during each cycle 2. to control the mean speed of the engine 3. to maintain a constant speed 4. to come into action when the speed varies
Last Answer : 1. to limit the fluctuation of speed during each cycle
Description : If the load on the engine is constant, the mean speed will be constant from the cycle, then (A) The governor will not operate but flywheel will be acting (B) The flywheel will be acting but ... (C) Both flywheel and governor will be acting (D) Both flywheel and governor will not be acting
Last Answer : (A) The governor will not operate but flywheel will be acting
Description : A flywheel is used, (A) To limit the fluctuations of speed during each cycle (B) To control the mean speed of the engine (C) To maintain a constant speed (D) To come into action when the speed varies
Last Answer : (A) To limit the fluctuations of speed during each cycle
Description : The coefficient of fluctuation of energy = (A) Maximum fluctuation of energy / work done per cycle (B) Fluctuation of energy / Work done per cycle (C) Maximum fluctuation of energy / Mean speed (D) Fluctuation of energy / Mean speed
Last Answer : (A) Maximum fluctuation of energy / work done per cycle
Description : The coefficient of fluctuation of energy of flywheel is 1. ratio of maximum fluctuation of energy to work done per cycle 2. ratio of to work done per cycle to maximum fluctuation of energy ... minimum kinetic energy during the cycle 4. ratio of maximum and minimum kinetic energy during the cycle
Last Answer : 1. ratio of maximum fluctuation of energy to work done per cycle
Description : The coefficient of fluctuation of energy of flywheel is, (A) Ratio of maximum fluctuation of energy to work done per cycle (B) Ratio of to work done per cycle to maximum fluctuation of ... minimum kinetic energy during the cycle (D) Ratio of maximum and minimum kinetic energy during the cycle
Last Answer : (A) Ratio of maximum fluctuation of energy to work done per cycle
Description : An engine working on air standard Otto cycle has a cylinder diameter of 10 cm and stroke length of 15 cm. The ratio of specific heats for air is 1.4. If the clearance volume is 196.3 cc and the heat supplied per kg of air per ... kg of air is a. 879.1 kJ/ b. 890.2 kJ c. 895.3 kJ d. 973.5 kJ
Last Answer : ANSWER d. 973.5 kJ
Description : The ratio of work done per cycle to the stroke volume of the compressor is known as A. Compressor capacity B. Compression ratio C. Compressor efficiency D. Mean effective pressure
Last Answer : ANSWER : D
Description : Cotter joint is going to be use to connect the two rods for torque transmission purpose. a) True b) False
Last Answer : b) False
Description : Cotter joint can be used to connect two rods for torque transmission purpose. true /false. a) True b) False
Description : A knuckle joint is unsuitable for two rotating shafts, which transmit torque a) True b) False
Last Answer : a) True
Description : Cotter joint can be used to connect two rods for torque transmission purpose. a) True b) False
Description : Two shafts A and B are made of same material. The diameter of shaft A is twice that of B. The torque transmitted by shaft A will be (A) Twice that of B (B) Four times that of B (C) Eight times that of B (D) Sixteen times that of B
Last Answer : (C) Eight times that of B
Description : Two shafts A and B are made of same material. The diameters of shaft A and B are dA and dB respectively. The ratio of torque transmitted by shaft A to that of shaft B will be (A) dA/dB- (B) (dA/dB-)2 (C) (dA/dB-)3 (D) (dA/dB-)4
Last Answer : (C) (dA/dB-)3
Description : When the driving torque is more than load torque, flywheel is ______ 1. Accelerated 2. Decelerated 3. Constant velocity 4. Can’t be determined
Last Answer : 1. Accelerated
Description : The flywheel is accelerate when 1. driving torque > load torque 2. driving torque < load torque 3. driving torque = load torque 4. driving torque / load torque
Last Answer : 1. driving torque > load torque
Description : The flywheel is accelerated when (A) Driving torque > Load torque (B) Driving torque < Load torque (C) Driving torque = Load torque (D) Any of the above
Last Answer : (A) Driving torque > Load torque
Description : When the torque required by the machine is more than the torque supplied by the motor, the flywheel is (A) Accelerated (B) Retarded (C) Rotating with constant speed (D) Any of the above
Last Answer : (B) Retarded
Description : When the driving torque is more than load torque, flywheel is ______ a) Accelerated b) Decelerated c) Constant velocity d) Can’t be determined
Last Answer : a) Accelerated
Description : Which of the following are not true for petroff’s equation? a) Shaft is considered concentric with the bearing b) Bearing is subjected to light load c) Is used to find coefficient of friction d) Frictional torque is given by fpr2l
Last Answer : d) Frictional torque is given by fpr2l
Description : When the helical torsion spring is subjected to torque, the type of stress induced in the spring wire is, (A) Tensile stress (B) Compressive stress (C) Bending stress (D) Torsional shear stress
Last Answer : (C) Bending stress
Description : Cotter joints is used for transforming rotating torque. A. True B. False
Last Answer : B. False
Description : Entire torque is transmitted by friction in the clamp coupling. a) True b) False
Description : Axle is frequently used in torque transmission. a) True b) False
Description : Saddle key is transmit power or torque through friction resistant only A. True B. False
Last Answer : A. True
Description : Splines are used if, (A) The power to be transmitted is high (B) The torque to be transmitted is high (C) The speed is high (D) There is relative motion between shaft and hub
Last Answer : (D) There is relative motion between shaft and hub
Description : The distribution of the forces along the length of key fitted in a shaft (A) Varies linearly (B) Is uniform throughout (C) Varies exponentially, being more near the torque-input end (D) Varies exponentially, being less near the torque-input end
Last Answer : (C) Varies exponentially, being more near the torque-input end
Description : Why consumption of lubricating oil is more in two-stroke cycle petrol engine than four-stroke cycle petrol engine ?
Last Answer : In two-stroke engine lub oil is mixed with petrol and thus some lub oil is blown out through the exhaust valves by scavenging and charging air. There is no such wastage in four stroke petrol engine.
Description : Executes the entire cycle in just two strokes the power stroke and the compression stroke. a. One-stroke engine b. Two-stroke engine c. Four-stroke engine d. Eight-stroke engine
Last Answer : Two-stroke engine
Description : In which step of the four-stroke engine cycle does the heat from the combustion reaction causes the pistons to move?
Last Answer : combustion and expansion
Description : The 'four stroke petrol engine' is based on – (1) Carnot-cycle (2) Otto-cycle (3) Diesel-cycle (4) Boyle's-cycle
Last Answer : (2) Otto-cycle Explanation: A four-stroke engine (also known as four-cycle) is an internal combustion n engine in which the piston completes four separate strokes—intake, compression, power, and exhaust—during two separate revolutions of the engine's crankshaft, and one single thermodynamic cycle.
Description : The ‘four stroke petrol engine’ is based on (1) Carnot-cycle (2) Otto-cycle (3) Diesel-cycle (4) Boyle’s-cycle
Last Answer : Otto-cycle
Description : If a circular shaft is welded to the plate by means of circumferential fillet, then the shaft is subjected to torsional moment M. If throat of weld is t, then torsional shear stress is given by a) M/2πtr2 b) M/πtr2 c) M/4πtr2 d) None of the listed
Last Answer : a) M/2πtr2
Description : A flywheel is used, (A) To store and release energy when required during the work cycle (B) To reduce the power capacity of electric motor (C) To reduce the amplitude of speed fluctuations (D) Any one of above functions
Last Answer : (D) Any one of above functions
Description : Which of the following are functions of flywheel? a) Store and release energy during work cycle b) Reduce power capacity of the electric motor c) Reduce amplitude of speed fluctuations d) All of the listed
Last Answer : d) All of the listed
Description : If load on the engine is constant, the mean speed will be constant and ___ will not operate. a) Flywheel b) Governor c) Both flywheel and governor d) None of the mentioned
Last Answer : b) Governor
Description : The coefficient of fluctuation of speed of flywheel is 1. ratio of maximum and minimum speeds during the cycle 2. ratio of maximum fluctuation of speed to the mean speed 3. ratio of mean ... maximum fluctuation of speed during the cycle 4. sum of maximum fluctuation of speed and the mean speed
Last Answer : 2. ratio of maximum fluctuation of speed to the mean speed
Description : The maximum fluctuation of energy of flywheel is 1. difference between maximum and minimum kinetic energy during the cycle 2. difference between maximum and mean kinetic energy during the cycle 3. ... kinetic energy during the cycle 4. mean of maximum and minimum kinetic energy during the cycle
Last Answer : 1. difference between maximum and minimum kinetic energy during the cycle
Description : The coefficient of fluctuation of speed of flywheel is, (A) Ratio of maximum and minimum speeds during the cycle (B) Ratio of maximum fluctuation of speed to the mean speed (C) Ratio of ... maximum fluctuation of speed during the cycle (D) Sum of maximum fluctuation of speed and the mean speed
Last Answer : (B) Ratio of maximum fluctuation of speed to the mean speed