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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 3401. |
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 |
| Answer» D. | |
| 3402. |
The cylinder condensation or missing quantity may be reduced by |
| A. | the efficient steam jacketing of the cylinder walls |
| B. | superheating the steam supplied to the engine cylinder |
| C. | keeping the expansion ratio small in each cylinder |
| D. | all of the above |
| Answer» E. | |
| 3403. |
The actual vacuum in a condenser is equal to |
| A. | barometric pressure + actual pressure |
| B. | barometric pressure - actual pressure |
| C. | gauge pressure + atmospheric pressure |
| D. | gauge pressure - atmospheric pressure |
| Answer» C. gauge pressure + atmospheric pressure | |
| 3404. |
The mechanical draught __________ with the amount of smoke. |
| A. | increases |
| B. | decreases |
| C. | does not effect |
| Answer» C. does not effect | |
| 3405. |
The damper in a steam boiler is provided to control the draught (i.e. rate of flow of air) and thus regulate the rate of generation of steam. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 3406. |
When the expansion of steam is carried out in a single cylinder and then exhausted into the atmosphere or a condenser, the engine is said to be a simple steam engine. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 3407. |
The function of a superheater is to heat the feed water by utilising the heat in the exhaust flue gases before leaving through the chimney. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 3408. |
Lancashire boiler is a stationary fire tube boiler. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 3409. |
The factor of evaporation for all boilers is always |
| A. | equal to unity |
| B. | less than unity |
| C. | greater than unity |
| Answer» D. | |
| 3410. |
Lancashire boiler is used where working pressure and power required are |
| A. | low |
| B. | moderate |
| C. | high |
| D. | none of these |
| Answer» C. high | |
| 3411. |
The ratio of the actual vacuum to the ideal vacuum in a condenser is called |
| A. | condenser efficiency |
| B. | vacuum efficiency |
| C. | nozzle efficiency |
| D. | boiler efficiency |
| Answer» C. nozzle efficiency | |
| 3412. |
Willian's law states that the steam consumption per hour provided with a throttled governor is proportional to (where I.P. = Indicated power) |
| A. | <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/298-231-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/298-231-2.png"> |
| C. | I.P. |
| D. | (I.P.) |
| E. | <sup>2</sup> |
| Answer» D. (I.P.) | |
| 3413. |
The ratio of the volume at cut-off to the swept volume is called |
| A. | cut-off ratio |
| B. | expansion ratio |
| C. | clearance ratio |
| D. | none of these |
| Answer» B. expansion ratio | |
| 3414. |
A condenser where circulating water flows through tubes which are surrounded by steam, in known as |
| A. | surface condenser |
| B. | jet condenser |
| C. | barometric condenser |
| D. | evaporative condenser |
| Answer» B. jet condenser | |
| 3415. |
Combustuion of fuel takes place __________ the engine cylinder of a steam engine. |
| A. | outside |
| B. | inside |
| Answer» B. inside | |
| 3416. |
The forced circulation of water does not take place in |
| A. | La-Mont boiler |
| B. | Lancashire boiler |
| C. | Velox boiler |
| D. | Benson boiler |
| Answer» C. Velox boiler | |
| 3417. |
A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through the chimny, is known as |
| A. | economiser |
| B. | fusible plug |
| C. | superheater |
| D. | stop valve |
| Answer» B. fusible plug | |
| 3418. |
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 | |
| 3419. |
The fittings mounted on the boiler for its proper and safe functioning is a |
| A. | water level indicatior |
| B. | pressure gauge |
| C. | safety valve |
| D. | all of these |
| Answer» E. | |
| 3420. |
The draught may be produced by a |
| A. | mechanical fan |
| B. | chimney |
| C. | a steam jet |
| D. | all of these |
| Answer» E. | |
| 3421. |
The rate of flow of steam is __________ in case of fire tube boilers. |
| A. | less |
| B. | more |
| Answer» B. more | |
| 3422. |
The number of water level indicators in a boiler are generally __________ in number. |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» C. three | |
| 3423. |
The fire tubes in a Locomotive boiler has __________ diameter. |
| A. | 4.75 mm |
| B. | 5.47 mm |
| C. | 7.45 mm |
| D. | 47.5 mm |
| Answer» E. | |
| 3424. |
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. | |
| 3425. |
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. | |
| 3426. |
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 | |
| 3427. |
The length of Lancashire boiler varies from |
| A. | 5 to 6 m |
| B. | 6 to 7 m |
| C. | 7.25 to 9 m |
| D. | 9 to 10 m |
| Answer» D. 9 to 10 m | |
| 3428. |
All steam engines work on |
| A. | Zeroth law of thermodynamics |
| B. | First law of thermodynamics |
| C. | Second law of thermodynamics |
| D. | none of these |
| Answer» D. none of these | |
| 3429. |
The capacity and working pressure.of a Cornish boiler is __________ as compared to Lancashire boiler. |
| A. | low |
| B. | high |
| Answer» B. high | |
| 3430. |
For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is __________ the piston speed of single acting steam engine. |
| A. | equal to |
| B. | twice |
| C. | three times |
| D. | four times |
| Answer» C. three times | |
| 3431. |
In a La-mont boiler, there is a __________ circulation of water and steam. |
| A. | forced |
| B. | natural |
| Answer» B. natural | |
| 3432. |
An air preheater |
| A. | increases evaporative capacity of the boiler |
| B. | increases the efficiency of the boiler |
| C. | enables low grade fuel to be burnt |
| D. | all of the above |
| Answer» E. | |
| 3433. |
Locomotive boiler produces steam at a very high rate. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 3434. |
A condenser in a steam power plant |
| A. | increases expansion ratio of steam |
| B. | reduces back pressure of steam |
| C. | reduces temperature of exhaust steam |
| D. | all of these |
| Answer» E. | |
| 3435. |
The diameter of internal flue tubes of a Lancashire boiler is about __________ that of its shell. |
| A. | one-fourth |
| B. | one-third |
| C. | two-fifth |
| D. | one-half |
| Answer» D. one-half | |
| 3436. |
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. | |
| 3437. |
The ratio of brake power to the indicated power is known as |
| A. | mechanical efficiency |
| B. | overall efficiency |
| C. | indicated thermal efficiency |
| D. | brake thermal efficiency |
| Answer» B. overall efficiency | |
| 3438. |
A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90 to each other, is called |
| A. | receiver type compound engine |
| B. | Tandem type compound engine |
| C. | Woolf type compound engine |
| D. | both (a) and (b) |
| Answer» B. Tandem type compound engine | |
| 3439. |
The diameter of superheated tubes in a locomotive boiler is |
| A. | 13 mm |
| B. | 31 mm |
| C. | 130 mm |
| D. | 230 mm |
| Answer» D. 230 mm | |
| 3440. |
A Cochran boiler is a horizontal multi-tubular boiler. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 3441. |
Which of the following is a fire tube boiler ? |
| A. | Lansashire boiler |
| B. | Babcock and Wilcox boiler |
| C. | Yarrow boiler |
| D. | none of these |
| Answer» B. Babcock and Wilcox boiler | |
| 3442. |
In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is __________ the lowpressure cylinder. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» C. more than | |
| 3443. |
Babcock and Wilcox boiler is a stationary type of water tube boiler. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 3444. |
In forced circulation steam boilers, the force is applied |
| A. | to draw water |
| B. | to circulate water |
| C. | to drain off the water |
| D. | all of these |
| Answer» C. to drain off the water | |
| 3445. |
When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by |
| A. | <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/287-111-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/287-111-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/287-111-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/287-111-2.png"> | |
| 3446. |
In a compound steam engine, the temperature range per cylinder is reduced, with corresponding reduction in the condensation. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 3447. |
The selection of type and size of a steam boiler depends upon |
| A. | the power required and working pressure |
| B. | the geographical position of the power house |
| C. | the fuel and water available |
| D. | all of the above |
| Answer» E. | |
| 3448. |
The high pressure and low pressure cylinders in a receiver type compound engine are regarded as having cranks |
| A. | 180 to each other |
| B. | 90 to each other |
| C. | 0 to each other |
| D. | none of these |
| Answer» C. 0 to each other | |
| 3449. |
The main object of a boiler trial is |
| A. | to determine the generating capacity of the boiler |
| B. | to determine the thermal efficiency of the boiler when working at a definite pressure |
| C. | to prepare heat balance sheet for the boiler |
| D. | all of the above |
| Answer» E. | |
| 3450. |
The artificial draught is produced by |
| A. | steam jet |
| B. | centrifugal fan |
| C. | chimney |
| D. | both (a) and (b) |
| Answer» E. | |