If Poisson's ratio of a resistance wire strain gauge is 1.8, then neglecting piezo-resistive effects, its Gauge factor is : 4.6
Description : Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor (A) is equal to that of a normal induction motor (B) is less than that of a normal induction motor (C) ... than that of a normal induction motor (D) may be less or greater than that of a normal induction motor
Last Answer : C
Description : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as?
Last Answer : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as 2 : 5.
Description : Voltage ratio
Last Answer : Voltage ratio
Description : Turns ratio
Last Answer : Turns ratio formula
Description : Impedance ratio
Last Answer : Impedance ratio
Description : Current ratio
Last Answer : Current ratio
Description : The ratio of the width to the height of the picture frame is called as A) Rastar B) Aspect Ratio C) Length Ratio D) Efficiency
Last Answer : The ratio of the width to the height of the picture frame is called as Aspect Ratio
Description : The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to :
Last Answer : The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to : Z (p.u)
Description : The ratio of active power to apparent power is known as____ factor.
Last Answer : The ratio of active power to apparent power is known as power factor.
Last Answer : The form factor is the ratio of r.m.s. value to average value.
Description : In otto cycle compression ratio is 8. Calculate air standard efficiency. Will it be grater than Carnot Cycle ? Justify your answer.
Last Answer : No, the Otto cycle efficiency 56.47% will always be lower than Carnot cycle efficiency. Justification: Carnot theorem states that keeping operating conditions same, Carnot engine is more efficient than any other engine. So, Otto cycle efficiency is lower than Carnot cycle efficiency.
Description : The Eb/V ratio of a d.c. motor is an indication of its?
Last Answer : The Eb/V ratio of a d.c. motor is an indication of its efficiency.
Description : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?
Last Answer : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is approximately equal to 1.
Description : A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is (A) -0.8 (B) 0.8 (C) +0.08 (D) -0.24
Last Answer : (D) -0.24
Description : Graph indicating changes in pollutants level w.r.t air fuel ratio
Last Answer : Graph indicating changes in pollutants level w.r.t air fuel ratio
Description : Compressor pressure ratio (CPR)
Last Answer : Compressor pressure ratio (CPR), is the ratio of the air total pressure exiting the compressor to the air pressure entering the compressor. This number is always greater than 1.0.
Description : SEER: Seasonal Energy Efficiency Ratio (SEER)
Last Answer : SEER: Seasonal Energy Efficiency Ratio (SEER), is most commonly used to measure the efficiency of a central air conditioner. The higher the SEER, the more efficient the system OR It is the ... the ratio of total capacity to the total KW energy usage at specific humidity and temperature condition.
Description : Define: 1) voltage ratio, 2) current ratio, 3) transformation ratio of transformer.
Last Answer : 1) Voltage ratio: The voltages in primary and secondary winding is proportional to number of turns in primary and secondary respectively. So, the voltage ratio is same as transformation ratio. V2/V1 = N2 ... as transformation ratio of transformer. It is denoted by K. K = N2/N1
Description : What is transformation ratio?
Last Answer : Transformation Ratio (k):- It is the ratio of secondary number of turns to primary number of turns. OR It is the ratio of secondary voltage to primary voltage. OR It is the ratio of primary current to secondary current.
Description : If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be
Last Answer : If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be 10
Description : Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is
Last Answer : Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is 16
Description : A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would (1) increase progressively (2 ... 0.5 and then increase (4) increase to a maximum value at α = 0.5 and then decrease
Last Answer : A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would increase to a maximum value at α = 0.5 and then decrease
Description : Specific energy consumption of an electric train is the ratio between (A) Specific energy output at driving wheels and efficiency of the traction motor (B) Specific energy output at driving wheels ... (D) Specific energy output at driving wheels and efficiency of the (motor + transmission gear)
Last Answer : Specific energy consumption of an electric train is the ratio between Specific energy output at driving wheels and efficiency of the (motor + transmission gear)
Description : The ratio of mass of proton to that of electron is nearly?
Last Answer : The ratio of mass of proton to that of electron is nearly 1840.
Description : The ratio of limiting friction and normal reaction is known as?
Last Answer : The ratio of limiting friction and normal reaction is known as coefficient of friction.
Last Answer : The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.
Last Answer : The ratio of starting torque to full-load torque is least in case of shunt motors.
Last Answer : A synchronous machine with low value of short-circuit ratio has lower stability limit.
Description : The voltage transformation ratio of a transformer is equal to the ratio of?
Last Answer : The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.
Description : Use of auto-transformer is economical when the transformation ratio is?
Last Answer : Use of auto-transformer is economical when the transformation ratio is near unity.
Description : cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is (A) 0 (B) 0.33 (C) 0.44 (D) 0.25
Last Answer : Option C
Description : The ratio of lateral strain to axial strain of a homogeneous material, is known (A) Yield ratio (B) Hooke's ratio (C) Poisson's ratio (D) Plastic ratio
Last Answer : (C) Poisson's ratio
Description : An open-ended cylinder of radius and thickness is subjected to internal pressure . The Young's modulus for the material is and Poisson's ratio is . The longitudinal strain is (A) Zero (B) pr/TE (C) pr/2TE (D) None of these
Last Answer : (A) Zero
Description : The ratio of lateral strain to linear strain is called (a) Modulus of Elasticity (b) Modulus of Rigidity (c) Bulk Modulus (d) Poisson’s Ratio
Last Answer : (d) Poisson’s Ratio
Description : Poisson’s ratio is a. Lateral strain / Longitudinal strain b. Shear strain / Lateral strain c. Longitudinal strain / Lateral strain d. Lateral strain / Volumetric strain
Last Answer : a. Lateral strain / Longitudinal strain
Description : Define volumetric strain. Also give the relation between lateral strain to and Poisson’s ratio.
Last Answer : Volumetric strain: Volumetric strain is defined as the ratio of change in volume to original volume.
Description : Explain working of resistance strain gauge
Last Answer : Principle working: Strain gauge is a passive, versatile transducer and it is often used for measuring weight, pressure, force and displacement .They sense the strain produced in a wire due to applied ... , allowing the strain measured to be related to the applied stress and hence the force applied.
Description : The advantage of a semiconductor strain gauge cover the wire round strain gauge is that
Last Answer : The advantage of a semiconductor strain gauge cover the wire round strain gauge is that it is more sensitive
Description : Gauge factor of strain gauge is defined as the ratio of per unit change in the ______.
Last Answer : Gauge factor of strain gauge is defined as the ratio of per unit change in the resistance to the per unit change in the length of the element.
Description : The law which states, "Within elastic limits strain produced is proportional to the stress producing it", is known as (A) Bernoulli's law (B) Stress law (C) Hooke's law (D) Poisson's law
Last Answer : (C) Hooke's law
Description : An organ pipe which is open at both ends resonates at its fundamental frequency. Neglecting any end effects, what wavelength is formed by this pipe in this mode of vibration if the pipe is 2 meters long? w) 2 meters x) 4 meters y) 6 meters z) 8 meters.
Last Answer : ANSWER: X -- 4 METERS
Description : After a projectile is fired horizontally near the earth's surface, the horizontal component of its velocity, neglecting any air resistance: w) increases steadily x) decreases steadily y) first decreases, then increases z) remains constant
Last Answer : ANSWER: Z -- REMAINS CONSTANT
Description : In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is: (1) 400 Hz (2) 800 Hz (3) 1200 Hz (4) None of these
Last Answer : In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is: 1200 Hz
Description : A constant potential difference is applied across the plates of a parallel-plate capacitor. Neglecting any edge effects, the electric field inside the capacitor is: w) constant x) varying as one over r squared y) decreasing as one moves from the positive to the negative plate z) zero
Last Answer : ANSWER: W -- CONSTANT
Description : Explain in brief the working principle of strain gauge. Define gauge factor and list out types of strain gauges.
Last Answer : If a metal conductor is stretched or compressed, the resistance changes as both length and diameter change. There is a change in the value of resistivity of the conductor also when it is ... metal film strain gauges 6. Diffused metal strain gauges 7. Sputter deposited thin metal strain gauge
Description : How strain gauge is used for pressure measurement, explain?
Last Answer : strain gauge: - strain gauge is used for pressure measurement as one of the arm of a wheatstones' bridge, the pressure is applied to the strain gauge through diaphragm elastic pressure sensor.
Description : Dummy strain gauge is used in conjunction with the main strain gauge to _____.
Last Answer : Dummy strain gauge is used in conjunction with the main strain gauge to compensate temperature effects.
Description : A strain gauge is a passive transducer and is employed for converting (a) Pressure into change in resistance (b) Force into displacement (c) Mechanical displacement into a change of resistance (d) None of the above
Last Answer : A
Description : A bullet is fired with a muzzle velocity of 1000 meters per second from a rifle clamped to a window 4.9 meters above ground level. Neglecting air resistance, the horizontal distance from the rifle at which the bullet will strike the ground is w) 4.9 meters x) 500 meters y) 1000 meters z) 4900 meters
Last Answer : ANSWER: Y -- 1000 METERS
Description : A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W
Last Answer : A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is 150 W