MCQOPTIONS
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MCQOPTIONS
This section includes 760 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.$? |
| A. | Same |
| B. | Less |
| C. | More |
| D. | None of these |
| Answer» D. None of these | |
| 602. |
The fire tubes in a Cochran boiler are$? |
| A. | Horizontal |
| B. | Vertical |
| C. | Inclined |
| D. | None of these |
| Answer» B. Vertical | |
| 603. |
In a uniflow engine$? |
| A. | Steam enters and exhausts through the same port |
| B. | Steam enters at one end and exhausts at the centre |
| C. | Steam enters at the centre and exhausts at the other end |
| D. | None of the above |
| Answer» C. Steam enters at the centre and exhausts at the other end | |
| 604. |
Which of the following is a fire tube boiler?? |
| A. | Lancashire boiler |
| B. | Babcock and Wilcox boiler |
| C. | Yarrow boiler |
| D. | None of these |
| Answer» B. Babcock and Wilcox boiler | |
| 605. |
In water wall furnace, the heat is transferred to the water walls by? |
| A. | Convection |
| B. | Radiation |
| C. | Conduction |
| D. | Radiation and conduction |
| Answer» C. Conduction | |
| 606. |
The cylindrical shell of a Lancashire boiler has diameter from? |
| A. | 1 to 2 m |
| B. | 1.25 to 2.25 m |
| C. | 1.5 to 2.5 m |
| D. | 1.75 to 2.75 m |
| Answer» E. | |
| 607. |
In designing air preheaters, the important design consideration is that? |
| A. | Approach temperature should be as low as possible |
| B. | Handling and maintenance should be easier |
| C. | Heat transfer area should be optimum |
| D. | Stack gases should not be cooled to the dew point |
| Answer» E. | |
| 608. |
In a throttling process? |
| A. | Steam temperature remains constant |
| B. | Steam pressure remains constant |
| C. | Steam enthalpy remains constant |
| D. | Steam entropy remains constant |
| Answer» D. Steam entropy remains constant | |
| 609. |
During storage, the heating value of coal? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | May increase or decrease depending upon the method of storage |
| Answer» C. Remain constant | |
| 610. |
Presence of moisture in fuel oil would? |
| A. | Keep the burner tips cool |
| B. | Aid in proper combustion |
| C. | Because sputtering, possibly extinguishing flame |
| D. | Clean the nozzles |
| Answer» D. Clean the nozzles | |
| 611. |
A stage, in reaction turbine, is represented by? |
| A. | Number of casing |
| B. | Number of entries of steam |
| C. | Number of exits of steam |
| D. | Each row of blades |
| Answer» E. | |
| 612. |
Boiler H.P. is defined as the? |
| A. | Steam evaporation rate per kg of fuel fired |
| B. | Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam |
| C. | The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam |
| D. | Work done by 1 kg of steam at saturation condition |
| Answer» D. Work done by 1 kg of steam at saturation condition | |
| 613. |
Equivalent evaporation is the amount of water evaporated in a boiler from and at? |
| A. | 0°C |
| B. | 100°C |
| C. | Saturation temperature at given pressure |
| D. | Room temperature |
| Answer» C. Saturation temperature at given pressure | |
| 614. |
The length of Cornish boiler varies from? |
| A. | 2 to 4.5 m |
| B. | 3 to 5 m |
| C. | 5 to 7.5 m |
| D. | 7 to 9 m |
| Answer» D. 7 to 9 m | |
| 615. |
The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.? |
| A. | 0°C |
| B. | 40°C |
| C. | 60°C |
| D. | 100°C |
| Answer» E. | |
| 616. |
A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called? |
| A. | Receiver type compound engine |
| B. | Tandem type compound engine |
| C. | Woolf type compound engine |
| D. | None of these |
| Answer» C. Woolf type compound engine | |
| 617. |
Locomotive boiler is a? |
| A. | Single tube, horizontal, internally fired and stationary boiler |
| B. | Single tube, vertical, externally fired and stationary boiler |
| C. | Multi-tubular, horizontal, internally fired and mobile boiler |
| D. | Multi-tubular, horizontal, externally fired and stationary boiler |
| Answer» D. Multi-tubular, horizontal, externally fired and stationary boiler | |
| 618. |
In forced circulation type boiler? |
| A. | Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum |
| B. | Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam |
| C. | Feed pump is employed to supplement natural circulation in water wall type furnace |
| D. | Water is converted into steam in one pass without any recirculation |
| Answer» E. | |
| 619. |
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)? |
| A. | Vb = 0.5 V cosα |
| B. | Vb = V cos α |
| C. | Vb = 0.5 V² cosα |
| D. | Vb = V² cos α |
| Answer» C. Vb = 0.5 V¬¨‚⧠cos≈í¬± | |
| 620. |
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the? |
| A. | Blades are equiangular |
| B. | Blade velocity coefficient is unity |
| C. | Blades are equiangular and frictionless |
| D. | Blade solidity is 0.65 |
| Answer» D. Blade solidity is 0.65 | |
| 621. |
A steam nozzle converts? |
| A. | Heat energy of steam into kinetic energy |
| B. | Kinetic energy into heat energy of steam |
| C. | Heat energy of steam into potential energy |
| D. | Potential energy into heat energy of steam |
| Answer» B. Kinetic energy into heat energy of steam | |
| 622. |
A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly? |
| A. | 150 kg/h |
| B. | 210 kg/h |
| C. | 280 kg/h |
| D. | 340 kg/h |
| Answer» E. | |
| 623. |
The flow through a nozzle is regarded as? |
| A. | Constant volume flow |
| B. | Constant pressure flow |
| C. | Isothermal flow |
| D. | Isentropic flow |
| Answer» E. | |
| 624. |
In a uniflow engine? |
| A. | Steam enters and exhausts through the same port |
| B. | Steam enters at one end and exhausts at the centre |
| C. | Steam enters at the centre and exhausts at the other end |
| D. | None of the above |
| Answer» C. Steam enters at the centre and exhausts at the other end | |
| 625. |
The factor of evaporation for all boilers is always |
| A. | Equal to unity |
| B. | Less than unity |
| C. | Greater than unity |
| D. | None of these |
| Answer» D. None of these | |
| 626. |
The number of flue tubes in Lancashire boiler is |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Four |
| Answer» D. Four | |
| 627. |
The efficiency of steam turbines may be improved by |
| A. | Reheating of steam |
| B. | Regenerative feed heating |
| C. | Binary vapor plant |
| D. | Any one of these |
| Answer» E. | |
| 628. |
By compounding the expansion of steam in two or more cylinders, the ratio of expansion |
| A. | Does not change |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» D. None of these | |
| 629. |
The feed check valve is used in order to |
| A. | Regulate flow of boiler water |
| B. | Check level of water in boiler drum |
| C. | Recirculate unwanted feed water |
| D. | Allow high pressure feed water to flow to drum and not allow reverse flow to take place |
| Answer» E. | |
| 630. |
Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler? |
| A. | Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler |
| B. | Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler |
| C. | Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes |
| D. | Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube |
| Answer» D. Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube | |
| 631. |
The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as |
| A. | Feed pump |
| B. | Injector |
| C. | Feed check valve |
| D. | Pressure gauge |
| Answer» B. Injector | |
| 632. |
The fire tubes in a Cochran boiler usually have _________ diameter. |
| A. | 6.25 mm |
| B. | 62.5 mm |
| C. | 72.5 mm |
| D. | 92.5 mm |
| Answer» C. 72.5 mm | |
| 633. |
The value of the reheat factor varies from |
| A. | 1.02 to 1.06 |
| B. | 1.08 to 1.10 |
| C. | 1.2 to 1.6 |
| D. | 1.6 to 2 |
| Answer» B. 1.08 to 1.10 | |
| 634. |
The steam enters the nozzle at a |
| A. | High pressure and a low velocity |
| B. | High pressure and a high velocity |
| C. | Low pressure and a low velocity |
| D. | Low pressure and a high velocity |
| Answer» B. High pressure and a high velocity | |
| 635. |
The diameter of cylindrical shell of the Lancashire boiler is of the order of |
| A. | 1 to 1.25 m |
| B. | 1 to 1.75 m |
| C. | 2 to 4 m |
| D. | 1.75 to 2.75 m |
| Answer» E. | |
| 636. |
When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as |
| A. | Throttle governing |
| B. | Cut-off governing |
| C. | By-pass governing |
| D. | None of these |
| Answer» B. Cut-off governing | |
| 637. |
The diameter of fire tubes in Cochran boiler is of the order of |
| A. | 2 cm |
| B. | 6 cm |
| C. | 8 cm |
| D. | 12 cm |
| Answer» C. 8 cm | |
| 638. |
Hygrometry deals with the |
| A. | Hygroscopic substances |
| B. | Water vapor in air |
| C. | Temperature of air |
| D. | Pressure of air |
| Answer» C. Temperature of air | |
| 639. |
The pressure of steam __________ while flowing through a nozzle. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of these |
| Answer» C. Remains constant | |
| 640. |
A boiler in India should conform to safety regulations of |
| A. | DIN |
| B. | BS |
| C. | ASTM |
| D. | IBR |
| Answer» E. | |
| 641. |
The ratio of heat equivalent to brake power to the energy supplied in steam is known as |
| A. | Mechanical efficiency |
| B. | Overall efficiency |
| C. | Indicated thermal efficiency |
| D. | Brake thermal efficiency |
| Answer» E. | |
| 642. |
Reheating of steam in a turbine |
| A. | Increases the work-done through the turbine |
| B. | Increases the efficiency of the turbine |
| C. | Reduces wear on the blades |
| D. | All of these |
| Answer» E. | |
| 643. |
A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion. |
| A. | 60° |
| B. | 90° |
| C. | 180° |
| D. | 270° |
| Answer» C. 180¬¨‚àû | |
| 644. |
One kg of steam sample contains 0.8 kg dry steam? Its dryness fraction is |
| A. | 0.2 |
| B. | 0.8 |
| C. | 1.0 |
| D. | 0.6 |
| Answer» C. 1.0 | |
| 645. |
The nozzle efficiency is the ratio of |
| A. | Workdone on the blades to the energy supplied to the blades |
| B. | Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam |
| C. | Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam |
| D. | None of the above |
| Answer» D. None of the above | |
| 646. |
Which device is used in thermal power plants to reduce level of pollution? |
| A. | Induced draft fan |
| B. | Smoke meter |
| C. | Chimney |
| D. | Precipitator |
| Answer» E. | |
| 647. |
In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure. |
| A. | Equal to |
| B. | Lower than |
| C. | Higher than |
| D. | None of these |
| Answer» D. None of these | |
| 648. |
The average value of diagram factor lies between |
| A. | 0.2 to 0.5 |
| B. | 0.5 to 0.65 |
| C. | 0.65 to 0.9 |
| D. | 0.8 to 1.2 |
| Answer» D. 0.8 to 1.2 | |
| 649. |
The friction in the nozzle __________ exit velocity of steam. |
| A. | Has no effect on |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» C. Increases | |
| 650. |
A regenerative steam cycle renders |
| A. | Increased work output per unit mass of steam |
| B. | Decreased work output per unit mass of steam |
| C. | Increased thermal efficiency |
| D. | Decreased work output per unit mass of steam as well as increased thermal efficiency |
| Answer» E. | |