Objective type questions for mechanical engineering

Here the objective type questions are given for the benefits of engineering students of Mechanical and Automobile Engineering.

OBJECTIVE TYPE QUESTIONS

1.  All the commercial liquid fuels are derived from natural petroleum (or crude oil).

A. True B. False

2.  A cycle consisting of one constant pressure, one constant volume and two isentropic processes

is known as

A. Carnot cycle

B. Stirling cycle

C. Otto cycle

D. Diesel cycle

3.The amount of heat required to raise the temperature of the unit mass of gas through one

degree at constant volume, is called

A. specific heat at constant volume

B. specific heat at constant pressure

C. kilo Joule

D. none of these

4.The compression ratio for petrol engines is

A. 3 to 6

B. 5 to 8

C. 15 to 20

D. 20 to 30

5. The diesel engines are also known as __________ engines.

A. compression ignition

B. spark ignition

6.A carburettor is used to supply

A. petrol, air and lubricating oil

B. air and diesel

C. petrol and lubricating oil

D. petrol and air

7. The detonation is also called knocking or pinking.

A. Yes B. No

8.In a four stroke cycle petrol engine, the inlet valve

A. opens at top dead centre and closes at bottom dead centre

B. opens at 20° before top dead centre and closes at 40° after bottom dead centre

C. opens at 20° after top dead centre and closes at 20° before bottom dead centre id) may

open or close anywhere.

9. The function of a connecting rod is not to convert reciprocating motion of the piston into rotary

A. True B. False

10. Surface plate is used to check the trueness of flat surfaces.

A. True B. False

11. A zinc diffusion process is called

A. galvanising B. anodising

C. parkerising D. sherardizing

12  The accuracy of micrometers, calipers, dial indicators can be checked by a

A. feeler gauge

B. slip gauge

C. ring gauge

D. plug gauge

13.  The type of file used for a wood work is

A. single-cut file

B. double cut file

C. rasp-cut file

D. any one of these

14. A taper provided on the pattern for its easy and clean withdrawal from the mould is known as

A. machining allowance

B. draft allowance

C. shrinkage allowance

D. distortion allowance

15. The condition that causes vapour locking in a brake system is

A. overheating of the fluid due to frequent brake application

B. overcooling of the brakes during high speed driving

C. keeping the vehicle without use for an extended period

D. an excessively high engine speed on a downhill road

16.  The portion of a crankshaft which rests on cylinder block is called main journal.

A. Yes B. No

17.  A baffle plate is fitted inside the oil pan to prevent the oil from splashing when it is subjected

to vibration and other movement during vehicle operation.

A. True B. False

18.  The motion of the cam is transferred to the valves through

A. pistons

B. rocker arms

C. camshaft pulley

19.  Which of the following symptom is caused as a result of brake disc run out ?

A. Ineffectiveness of the brakes

B. Judder during braking

C. Localized wearing of the brake pads

D. Rapid wearing of the brake pads

20.The function of an alternator in an automobile is to

A. supply electric power

B. convert mechanical energy into electrical energy

C. continually recharge the battery

D. partly convert engine power into electric power