In a three-phase system, the voltages are separated by

In a three-phase system, when the loads are perfectly balanced, the neutral current is

In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are

In a Y-Y source/load configuration, the

In a Y-connected circuit, the magnitude of each line current is

A constant load power means a uniform conversion of

If in a Y-connected ac generator, each phase voltage has a magnitude of 90 V_RMS, what is the magnitude of each line voltage?

Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by

In a certain Y-Y system, the source phase currents each have a magnitude of 9 A. The magnitude of each load current for a balanced load condition is

In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of

The most common type of ac motor is the

A single-phase sinusoidal voltage of 120 V is connected to a 90 load. Current in the circuit is

A three-phase generator is connected to three 90 ohm load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?

Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 ohm

If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage?

Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by

Pick up the incorrect statement from the following : The torsional resistance of a shaft is directly proportional to

The ratio of the length and diameter of a simply supported uniform circular beam which experiences maximum bending stress equal to tensile stress due to same load at its mid span, is

The strain energy stored in a spring when subjected to greatest load without being permanently distorted, is called

Co-efficient of wind resistance of a circular surface, is

Pick up the correct statement from the following:

The ratio of moments of inertia of a triangular section about its base and about a centroidal axis parallel to its base, is

The ratio of the maximum deflections of a simply supported beam with a central load W and of a cantilever of same length and with a load W at its free end, is

The greatest load which a spring can carry without getting permanently distorted, is called

A three hinged arch is generally hinged at its supports and

Flat spiral springs

Pick up the correct statement from the following:

The forces in the members of simple trusses, may be analysed by

A simply supported beam which carries a uniformly distributed load has two equal overhangs. To have maximum B.M. produced in the beam least possible, the ratio of the length of the overhang to the total length of the beam, is

At yield point of a test piece, the material

An isolated load W is acting at a distance a from the left hand support, of a three hinged arch of span 2l and rise h hinged at the crown, the horizontal reaction at the support, is

The ratio of lateral strain to axial strain of a homogeneous material, is known

The locus of reaction of a two hinged semi-circular arch, is

The ratio of the area of cross-section of a circular section to the area of its core, is

The yield moment of a cross section is defined as the moment that will just produce the yield stress in

The eccentricity (e) of a hollow circular column, external diameter 25 cm, internal diameter 15 cm for an eccentric load 100 t for non-development of tension, is

A short masonry pillar is 60 cm x 60 cm in cross-section, the core of the pillar is a square whose side is

A rectangular log of wood is floating in water with a load of 100 N at its centre. The maximum shear force in the wooden log is

The following assumption is not true in the theory of pure torsion :

The under mentioned type is simple strain

The ratio of the effective length of a column and minimum radius of gyration of its cross-sectional area, is known

Failure of riverted joints is due to

Pick up the correct assumption of the theory of simple bending

The neutral axis of a beam cross-section must

In a solid arch, shear force acts

A three hinged arch is loaded with an isolated load 1000 kg at a horizontal distance of 2.5 m from the crown, 1 m above the level of hinges at the supports 10 metres apart. The horizontal thrust is

For keeping the stress wholly compressive the load may be applied on a circular column anywhere within a concentric circle of diameter

A member is balanced at its end by two inclined members carrying equal forces. For equilibrium the angle between the inclined bars must be

To ascertain the maximum permissible eccentricity of loads on circular columns, the rule generally followed, is

Beams of uniform strength are preferred to those of uniform section because these are economical for

The moment diagram for a cantilever whose free end is subjected to a bending moment, will be a

Reactions at the supports of a structure can be determined by equating the algebraic sum of

Shear force for a cantilever carrying a uniformly distributed load over its length, is

For a stable frame structure, number of members required, is

When a rectangular beam is loaded transversely, the maximum compressive stress develops on

In a continuous bending moment curve the point where it changes sign, is called

Flexible foam (for mattresses) are usually made of

__________ fibres are made of polyamides.

Pick out the wrong statement.

Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C.

Which of the following is stretched into fibres ?

Phenol formaldehyde is produced by condensation polymerisation. It is also known as

Low density polythene as compared to high density polythene is

Maximum consumption of polymers is in

Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxident used in rubber ?

Polymethyl methacrylate, which is an acrylic resin, is also called

Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin.

Pick out the wrong statement.

Neoprene is rendered non-inflammable, because of

Phosphates (e.g., triceresyl, tributyl, tetrabutyl, tripheyl etc.) are added to polymers to act as

__________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate.

Which of the following is a natural polyamide fibre.

__________ is a copolymer.

Polycaprolactum is nothing but

Zeigler process

Viscosity of a polymer solution or melt

Which of the following polymers has the tendency of decomposing before melting ?

Which of the following polymers belong to the class of formaldehyde resin ?

Nylon 6 as compared to nylon 6, 6 has lower

Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ?

__________ is an addition polymer

Branched chair polymers as compared to linear polymers have

Ion exchange resins are made of

__________ is a thermosetting plastic.

__________ is a natural fibre.

Pick out the wrong statement.

Perspex can be used as a substitute of glass. Its monomer is

Addition polymerisation is not involved in the manufacture of

Most of the plastics are safe to be used upto a maximum temperature of __________ °C.

__________ is a homopolymer.

Plastic tubes & pipes are generally made by __________ moulding.

Pick out the correct statement.

Condensation polymerisation is not involved in the manufacture of

Glyptal used in the manufacture of paints & lacquers is a __________ polymer.

Addition of stabiliser during PVC manufacture is done to

Which of the following is not a polyolefin ?

A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to

In the previous question, if e = electronic charge, the minimum magnitude of Q is

Two particles, each of mass m and carrying charge Q, are separated by some distance. If they are in equilibrium under mutual gravitational and electrostatic forces then Q/m (in C/kg) is of the order of

Charge Q is divided into two parts which are then kept some distance apart. The force between them will be maximum if the two parts are

Which of the following is not true for a region with a uniform electric field?e

All charge on a conductor must reside only on its outer surface.’ This statement is true

A positive point charge, which is free to move, is placed inside a hollow conducting sphere with negative charge, away from its centre. It will

A spherical equipotential surface is not pOSSible

In a certain charge distribution,. all points having zero potential· can be joined by a circle S. Points inside S have positive potential, and points outside S have negative potential. A positive charge, which is free to move, is placed inside S.

In a parallel-plate capacitor, the region between the plates is filled by a dielectric slab. The capacitor is connected to a cell and the slab is taken out

In a parallel-plate capacitor, the region between the plates is filled by a dielectric slab. The capacitor is charged from a cell and then disconnected from it. The slab is now taken out.

In a parallel-plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. The thickness of the sheet is half of the separation between the plates. The capacitance now becomes

Two capacitors of capacitances 3 JlF and 6 JlF are charged to a potential of 12 Veach. They are now connected to each other, with the positive plate of each jOined to the negative plate of the other. The potential difference across each will be

A capacitor of capacitance C is charged to a potential difference V from a cell and then disconnected from it. A charge +Q is now given to its positive plate. The potential difference across the capacitor is now

A spring-block system undergoes vertical oscillation above a large horizontal metal sheet with uniform positive charge. The time period of the oscillation is T. If the block is given a charge Q, its time period of oscillation will be

If the earth’s surface is treated as a conducting surface with some charge, what should be the order of magnitude of the charge per unit area, in C/m 2, so that a proton remains suspended in space near the earth’s surface?

A solid sphere of radius R is charged uniformly. At whl1l distance from its surface is the electrostatic potential half of lhe potential at the centre?

Two identical metal balls with charges +2Q and -Q are separated by some distance, and exert a force F on each other. They are . joined by a conducting wire, which is then removed. The force – between them will now

A point charge Q is moved along a circular path around another fixed point charge. The work done is zero

Three point charges are placed at the comers of an equilateral triangle. Assume that only electrostatic forces are acting.

The average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?

Sumitra has an average of 56% on her first 7 examinations. How much she should make on her eighth examination to obtain an average of 60% on 8 examinations?

Ages of ‘A’ and ‘B’ are in the ratio of 2 : 3 respectively. Six years hence the ratio of their ages will become 8 : 11 respectively. What is B’s present age?

The total age of A and B is 12 years more than that of total age of B and C. C is how many years younger than A?

In the first 10 overs of a cricket game, the run rate was only 3.2. What should be the run rate in the remaining 40 overs to reach the target of 282 runs?

A family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?

A grocer has a sale of Rs. 6435, Rs. 6927, Rs. 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs. 6500?

The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?

The average weight of 8 person’s increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?

The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team?

The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of P is:

The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is:

A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?

In Arun’s opinion, his weight is greater than 65 kg but less than 72 kg. His brother doest not agree with Arun and he thinks that Arun’s weight is greater than 60 kg but less than 70 kg. His mother’s view is that his weight cannot be greater than 68 kg. If all are them are correct in their estimation, what is the average of different probable weights of Arun

The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is:

The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.

A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:

If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:

A pupil’s marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:

In a school with 600 students, the average age of the boys is 12 years and that of the girls is 11 years. If the average of the school is 11 years 9 months, then the number of girls in the school is: ?

The scavenging efficiency of a tour stroke cycle diesel engine is

The voltage required to produce a spark across the gap, between the sparking points is

The control rods in the control system of nuclear reactors are used to

If the speed of the engine is increased, the indicated power will

The specific fuel consumption per B.P. hour for a petrol engine is about

he material most commonly used for sheilding is

In order to eliminate knocking in compression ignition engines, there should be

Reflector in nuclear power plants __________ neutron leakage.

Number of working strokes per min. for a two stroke cycle engine are __________ the speed of the engine in r.p.m.

The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

A fuel of cetane number 40 has the same ignition quality as a mixture of

The two reference fuels used for cetane rating are

In petrol engines, the delay period is of the order of

In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

A diesel engine is __________ as compared to petrol engine, both running at rated load.

Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine ?

The pressure at the end of compression, in petrol engines, is approximately

Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of

A higher compression ratio causes

Which of the following statement is correct ?

Which of the following statement is correct regarding petrol engines?

Which of the following statement is correct regarding petrol engines?

Supercharging __________ the power developed by the engine.

The colour of exhaust from diesel engine is generally.

In compression ignition engines, swirl denotes a

A mixture containing 65% of iso-octane and 35% of normal heptane will have

Which of the following statement is wrong ?

The maximum propulsive efficiency of a turbo-jet engine is at a speed of