MCQ Questions and Answers on Theory of Machines

Q.

Certain minimum number of teeth on the involute pinion is necessary in order to

A. Provide an economical design

B. Avoid interference

C. Reduce noise in operation

D. Overcome fatigue failure of the teeth

Discuss

Answer : Option:- B

Explanation :

Certain minimum number of teeth on the involute pinion is necessary in order to avoid interference.

Q.

External gear with 60 teeth meshes with a pinion of 20 teeth, module being 6 mm. What is the center distance in mm?

A. 120

B. 180

C. 240

D. 300

Discuss

Answer : Option:- A

Explanation :

Given:
Teeth on pinion Tp=20,
Teeth on gear Tg = 60,
Module m = 6
Centre distance is given by,
C.D. = m(Tg-Tp)/2
C.D. = 6(60-20)/2
C.D. = 120 mm --(ans)

Q.

The number of degrees of freedom of an epicylcic gear train is

A. Zero

B. One

C. Two

D. Three

Discuss

Answer : Option:- B

Explanation :

In epcicyclic gear train, the motion of one link decides the motion of others. Hence, the degree of freedom is one.

Q.

Which of the following is the higher pair?

A. Belt and pulley

B. Turning pair

C. Screw pair

D. Sliding pair

Discuss

Answer : Option:- A

Explanation :

Belt and pulley is the higher pair.

Q.

Static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because,

A. The unbalanced couples are cause only at higher speeds

B. The unbalanced forces are dangerous at higher speeds

C. The effects of unbalances are proportional to the square of the speed

D. The effects of unbalances are directly proportional to the speed

Discuss

Answer : Option:- C

Explanation :

The acceleration is proportional to square of the angular speed, and so is the unbalanced forces. Thus, at higher speeds, dynamic balancing is also necessary.

Q.

Introduction of the flywheel in a rotating system smoothens

A. The bending moment on the rotating shaft

B. The twisting moment on the shaft

C. The bending stress on the shaft

D. The axial force along the shaft

Discuss

Answer : Option:- B

Explanation :

The absorption of energy by flywheel smoothens the twisting moment on the rotating shafts.

Q.

A flywheel of moment of inertia 9.8 kg·m2 fluctuates by 30 rpm for a fluctuation in energy of 1936 Joules. The mean speed of the flywheel is (rpm)

A. 600

B. 900

C. 968

D. 2940

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

The radius of gyration of a solid disc type flywheel of diameter D is

A. d

B. d/√2

C. d/2

D. d/(2√2)

Discuss

Answer : Option:- B

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

Flywheels are fitted for single cylinder and multicylinder engine of the same power rating. Which of the following statement is true?

A. The flywheel will be smaller for single cylinder engine as compared to that for multi-cylinder engine.

B. The flywheel will be smaller for multi-cylinder engine as compared to that for single cylinder engine.

C. The flywheels for two engines will be identical.

D. The size of flywheel for a engine depends on the compression ratio.

Discuss

Answer : Option:- B

Explanation :

There will be less variation of turning moment in the multi-cylinder engine as compared to that for single cylinder engine.

Q.

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half mean radius of the former, then energy stored in the latter at the same speed will be

A. Four times the first one

B. Same as the first one

C. One-fourth of the first one

D. One and half times the first one

Discuss

Answer : Option:- C

Explanation :

Energy stored is directly proportional to square of mean radius.
E1/E2 = (1/2)²/1²
E1/E2 = 1/4

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MCQ Questions and Answers on Theory of Machines

Q. Certain minimum number of teeth on the involute pinion is necessary in order to

Q. External gear with 60 teeth meshes with a pinion of 20 teeth, module being 6 mm. What is the center distance in mm?

Q. The number of degrees of freedom of an epicylcic gear train is

Q. Which of the following is the higher pair?

Q. Static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because,

Q. Introduction of the flywheel in a rotating system smoothens

Q. A flywheel of moment of inertia 9.8 kg·m2 fluctuates by 30 rpm for a fluctuation in energy of 1936 Joules. The mean speed of the flywheel is (rpm)

Q. The radius of gyration of a solid disc type flywheel of diameter D is

Q. Flywheels are fitted for single cylinder and multicylinder engine of the same power rating. Which of the following statement is true?

Q. If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half mean radius of the former, then energy stored in the latter at the same speed will be

Q.

Certain minimum number of teeth on the involute pinion is necessary in order to

Q.

External gear with 60 teeth meshes with a pinion of 20 teeth, module being 6 mm. What is the center distance in mm?

Q.

The number of degrees of freedom of an epicylcic gear train is

Q.

Which of the following is the higher pair?

Q.

Static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because,

Q.

Introduction of the flywheel in a rotating system smoothens

Q.

A flywheel of moment of inertia 9.8 kg·m2 fluctuates by 30 rpm for a fluctuation in energy of 1936 Joules. The mean speed of the flywheel is (rpm)

Q.

The radius of gyration of a solid disc type flywheel of diameter D is

Q.

Flywheels are fitted for single cylinder and multicylinder engine of the same power rating. Which of the following statement is true?

Q.

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half mean radius of the former, then energy stored in the latter at the same speed will be