# Acceleration Time MCQ Questions & Answers

Acceleration Time MCQs : This section focuses on the "Acceleration Time". These Multiple Choice Questions (MCQs) should be practiced to improve the Acceleration Time skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

A 14-pole, 3-phase, 50 Hz induction motor is operating at a speed of 99 rpm. The frequency of the rotor current of the motor in Hz is __________

A. 39.5
B. 40
C. 38.45
D. 39.9

Question 2

A 3-phase induction motor runs at almost 50 rpm at no load and 25 rpm at full load when supplied with power from a 50 Hz, 3-phase supply. What is the corresponding speed of the rotor field with respect to the rotor?

A. 25 revolution per minute
B. 20 revolution per minute
C. 10 revolution per minute
D. 30 revolution per minute

Question 3

Calculate the moment of inertia of the thin spherical shell having a mass of 3 kg and diameter of 66 cm.

A. .2156 kgm2
B. .2147 kgm2
C. .2138 kgm2
D. .2148 kgm2

Question 4

Calculate the phase angle of the sinusoidal waveform z(t)=18cos(1546?t+1900?÷76).

A. 25?÷39
B. 25?÷5
C. 25?÷1
D. ?÷4

Question 5

Calculate the reactive power in a 23 ? resistor.

A. 45 VAR
B. 10 VAR
C. 245 VAR
D. 0 VAR

Question 6

Calculate the value of the angular acceleration of the motor using the given data: J = .01 kg-m2, load torque= 790 N-m, motor torque= 169 N-m.

Question 7

Calculate the value of the duty cycle if the system is on for 48 sec and off for 1 sec.

A. 0.979
B. 0.444
C. 0.145
D. 0.578

Question 8

Calculate the value of the frequency if the signal completes half of the cycle in 30 sec. Assume signal is periodic.

A. 0.028 Hz
B. 0.016 Hz
C. 0.054 Hz
D. 0.045 Hz

Question 9

Calculate the value of the frequency of the 220 V DC supply.

A. 10 Hz
B. 0 Hz
C. 20 Hz
D. 90 Hz

Question 10

Calculate the value of the time period if the frequency of the signal is 1 sec.

A. 1 sec
B. 2 sec
C. .5 sec
D. 1.5 sec

Question 11

Calculate the velocity of the disc if the angular speed is 5 rad/s and radius is 2 m.

A. 25 m/s
B. 20 m/s
C. 25 m/s
D. 10 m/s

Question 12

The slope of the V-I curve is 23.56°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

A. .464 ?
B. .436 ?
C. .443 ?
D. .463 ?

Question 13

The slope of the V-I curve is 270°. Calculate the value of resistance.

A. 112 ?
B. 178 ?
C. infinite ?
D. 187 ?

Question 14

Calculate the phase angle of the sinusoidal waveform z(t)=18cos(1546πt+1900π÷76).

A. 25π÷39
B. 25π÷5
C. 25π÷1
D. π÷4

Question 15

Calculate the reactive power in a 23 Ω resistor.

A. 45 VAR
B. 10 VAR
C. 245 VAR
D. 0 VAR

Question 16

The slope of the V-I curve is 23.56°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

A. .464 Ω
B. .436 Ω
C. .443 Ω
D. .463 Ω