Explore topic-wise MCQs in Mechanical Engineering.

This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

A. high neutron absorption cross-section
B. low moderating efficiency
C. high neutron scatter cross-section
D. low neutron absorption cross-section
Answer» C. high neutron scatter cross-section
Discussion
2.

The normal heptane (CH) is given a rating of __________ octane number.

A. 0
B. 50
C. 100
D. 120
Answer» B. 50
Discussion
3.

The air standard efficiency ofan I.C. engine is given by (where = Compression ratio, and γ = Ratio of specific heats)

A. 1 -
B. 1 +
C. none of these
Answer» D.
Discussion
4.

Which of the following statement is correct regarding the features of a Breeder reactor?

A. It produces more fuel than it consumes.
B. It requires highly enriched fuel.
C. It requires liquid sodium metal as moderator.
D. all of the above
Answer» E.
Discussion
5.

A fission chain reaction in uranium can be developed

A. by increasing the contents of U
B. by slowing down fast neutrons so that U
C. fission continues by slow neutron
D. both (a) and (b)
E. none of these
Answer» D. both (a) and (b)
Discussion
6.

The brake power (B.P.) of the engine is given by (where = Brake load or dead load in newtons, = Length of arm in metres, = Speed of engine in r.p.m., - Spring balance reading in newtons, = Dia. of brake drum in metres, and = Dia. of rope in metres)

A. all of these
Answer» E.
Discussion
7.

A power plant giving least running cost of production of electrical power is

A. steam power plant
B. gas turbine power plant
C. hydro electric power plant
D. nuclear power plant
Answer» E.
Discussion
8.

Plutonium (Pu) is produced

A. artificially
B. by fission of Th
C. when U
D. is irradiated by neutrons
E. as basic raw material
Answer» D. is irradiated by neutrons
Discussion
9.

A nuclear reactor is said to be critical when the neutron population in the reactor core is

A. rapidly increasing leading to the point of explosion
B. decreasing from the specified value
C. reduced to zero
D. constant
Answer» E.
Discussion
10.

Iso-octane (CH) has octane number of

A. 0
B. 50
C. 100
D. 120
Answer» D. 120
Discussion
11.

Nuclear reactors are used

A. to produce heat for thermoelectric power
B. to produce fissionable material
C. to propel ships, submarines, aircrafts
D. all of these
Answer» E.
Discussion
12.

Alpha-methyl-naphthalene (C H) has a cetane number of

A. 0
B. 50
C. 100
D. 120
Answer» B. 50
Discussion
13.

The mechanical efficiency (η) of the engine is given by

A. none of these
Answer» B.
Discussion
14.

A gas engine has a swept volume of 300 cm and clearance volume of 25 cm. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

A. 248 cm
B. 252 cm
C. 264 cm
D. 286 cm
Answer» D. 286 cm
Discussion
15.

Uranium has isotopes

A. U
B. U
C. U
D. all of these
Answer» E.
Discussion
16.

The unit million electron volts () is commonly used to measure the nuclear energy.

A. True
B. False
Answer» B. False
Discussion
17.

The cetane (CH) which is a straight chain paraffin is assigned a cetane number of

A. 0
B. 50
C. 100
D. 120
Answer» D. 120
Discussion
18.

Each fission of U produces on the average __________ fast neutrons as a product of reaction.

A. 2.46
B. 24.6
C. 246
D. 2460
Answer» B. 24.6
Discussion
19.

U is produced

A. artificially
B. as basic raw material
C. when thorium is irradiated by neutrons
D. by fission of U
Answer» D. by fission of U
Discussion