Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.

The following characteristic curves (P, Q, R, S) pertain to rotary drilling in rock.
Mining Machinery mcq question image

Title of the curve
I : Torque versus RPM
II: Rate of penetration versus uniaxial compressive strength of rock
III : Rate of penetration versus weight on bit
IV : Specific energy versus weight on bit
Match the curves with their titles

A

P-III, Q-IV, R-II, S-I

B

P-II, Q-IV, R-I, S-III

C

P-IV, Q-III. R-II, S-I

D

P-I, Q-III, R-II, S-IV

Which concentration plot is linear for a first order reaction? (A is one of the reactant) versus time b) 2 versus time c) Ln versus time d) √ versus time

A

versus time

B

A

C

A

D

A

Consider the four statements given below about the function f(x) = x⁴ - x² in the range $$ - \infty P. The plot of f(x) versus x has two maxima and two minima.
Q. The plot of f(x) versus x cuts the x axis at four points.
R. The plot of f(x) versus x has three extrema.
S. No part of the plot f(x) versus x lies in the fourth quadrant.
Pick the right combination of correct choices from those given below.

A

P and R

B

R only

C

R and S

D

P and Q

A partner cannot contract himself out of which of the following duties?
(1) Duty of utmost good faith, i.e. uberrimae fidei.
(2) Duty of carry on business to greatest common advantage.
(3) Duty to render true accounts and full information.
(4) Duty to indemnify for fraud.
(5) Duty to indemnify for willful neglect.
(6) Duty to properly use the firm's property.

A

(1), (2), (3) and (6)

B

(1), (2), (4) and (5)

C

(1), (2), (3) and (5)

D

(1), (2), (4) and (6)

A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

A

25%

B

50%

C

1%

D

100%

The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.

A

True

B

False

In case of a single-pulse width modulation with the pulse width = 2d, to eliminate the 3rd harmonic from the output voltage waveform, the value of the pulse width (2d) must be

A

0°

B

60°

In case of a single-pulse width modulation with the pulse width = 2d, to eliminate the 5th harmonic from the output voltage waveform, the value of the pulse width (2d) must be equal to

A

72°

B

86°

The amplitude of the nth harmonic of the two-pulse MPM waveform is given by __________ Let d be the width of a single pulse and ɣ be the distance from 0 to the centre of the first pulse.

A

(8Vs/nπ) sin(nɣ) sin(nd/2)

B

(4Vs/nπ) sin(nɣ) sin(nd/2)

C

(8Vs/nπ) sin(nπ) sin(nd/2)

D

(8Vs/nπ) sin(nɣ/2) sin(nd/2)

A 20 kHz pulse waveform consists of pulses that are 15 µs wide. The duty cycle

A

Is 1%

B

Is 30%

C

Is 100%

D

Cannot be determined

Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.

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