Electric Circuits. (11th Edition)
11th Edition
ISBN: 9780134746968
Author: James W. Nilsson, Susan Riedel
Publisher: PEARSON
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Chapter 7, Problem 18P
a)
To determine
Find the expression
b)
To determine
Find the total energy delivered to the
c)
To determine
Find how many time constant required to deliver 95 % of the total energy.
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1- A squirrel cage induction motor is not selected when
(A) initial cost is the main consideration (B) maintenance cost is to be kept low
(C) higher starting torque is the main consideration (D) all above considerations are involved
2- The torque of an induction motor is ..............
(A) directly proportional to slip (B) inversely proportional to slip...
(C) proportional to the square of the slip (D) none of the above
3- Insertion of resistance in the stator of an induction motor.
(A) increases the load torque (B) decreases the starting torque
(C) increases the starting torque (D) none of above
tool to slip
10 or of the above
4- Increase in the length of air-gap in the induction motor results in the increasing of its
(A) air-gap flux (B) magnetizing current
(C) speed (D) power factor
5- In cumulatively cascade method for speed controlling, if PA is the number of poles of main motor and
PB is the number of poles of auxiliary motor. Then the speed of the set…
Chose the correct answer:
1- The resultant flux in stator winding of three-phase induction motor is equal to
(A) Maximum value of flux due to any phase
(B) Twice of the maximum value of flux due to any phase.
(C) 0.5 times the maximum value of flux due to any phase
(D) 1.5 times the maximum value of flux due to any phase
2- Which one of the following starters cannot be used for 3-phase, star - connected, slip-ring induction
motor?
(A) Auto-transformer starter (B) Star-delta starter
(C) Direct-on-line starter
(D) Rotor resistance starter
3- The crawling in the induction motor is caused by..............
(A) low voltage supply (B) high loads
(D) improper design of the machine
(C) harmonics developed in the motor
4- The 'cogging' of an induction motor can be avoided by...........
(A) good ventilation
(B) using DOL starter
(C) star-connecting of stator winding
(D) having number of rotor slots more or less than the number of stator slots
5- The method which can be used for the speed control…
Chapter 7 Solutions
Electric Circuits. (11th Edition)
Ch. 7.1 - The switch in the circuit shown has been closed...Ch. 7.1 - Prob. 2APCh. 7.2 - Prob. 3APCh. 7.2 - Prob. 4APCh. 7.3 - Prob. 5APCh. 7.3 - Prob. 6APCh. 7.4 - Prob. 7APCh. 7.4 - Prob. 8APCh. 7.5 - Prob. 9APCh. 7.5 - Prob. 10AP
Ch. 7.7 - There is no energy stored in the capacitor at the...Ch. 7.7 - Prob. 12APCh. 7 - Prob. 1PCh. 7 - In the circuit shown in Fig. P 7.2, the switch...Ch. 7 - Prob. 3PCh. 7 - The switch shown in Fig. P 7.4 has been open for a...Ch. 7 - Prob. 5PCh. 7 - For the circuit of Fig. P 7.5, what percentage of...Ch. 7 - Prob. 7PCh. 7 - In the circuit in Fig. P 7.8, the voltage and...Ch. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 -
The switch in the circuit seen in Fig. P 7.11 has...Ch. 7 - In the circuit in Fig. P 7.11, let Ig represent...Ch. 7 - The two switches in the circuit seen in Fig. P...Ch. 7 - Prob. 14PCh. 7 - Prob. 15PCh. 7 - Prob. 16PCh. 7 - Prob. 17PCh. 7 - Prob. 18PCh. 7 - Prob. 19PCh. 7 - For the circuit seen in Fig. P 7.19, find
the...Ch. 7 - Prob. 21PCh. 7 - Prob. 22PCh. 7 - Prob. 23PCh. 7 - Prob. 24PCh. 7 - The switch in the circuit in Fig. P 7.25 is closed...Ch. 7 - In the circuit shown in Fig. P 7.26, both switches...Ch. 7 -
In the circuit in Fig. P 7.27 the voltage and...Ch. 7 - Prob. 28PCh. 7 - Prob. 29PCh. 7 - The switch in the circuit seen in Fig. P 7.30 has...Ch. 7 - In Problem 7.30 how many microjoules of energy are...Ch. 7 - Prob. 33PCh. 7 - Prob. 34PCh. 7 - Prob. 35PCh. 7 - Prob. 36PCh. 7 - Prob. 37PCh. 7 - The switch in the circuit shown in Fig. P 7.38 has...Ch. 7 - Prob. 39PCh. 7 - Prob. 40PCh. 7 - Prob. 41PCh. 7 - Prob. 42PCh. 7 - Prob. 43PCh. 7 - Prob. 44PCh. 7 - Prob. 45PCh. 7 - Prob. 46PCh. 7 - For the circuit in Fig. P 7.4, find (in...Ch. 7 - Prob. 48PCh. 7 - Prob. 49PCh. 7 - Prob. 50PCh. 7 - Prob. 51PCh. 7 - Prob. 52PCh. 7 - Prob. 53PCh. 7 - Prob. 54PCh. 7 - The switch in the circuit of Fig. P 7.55 has been...Ch. 7 - The switch in the circuit seen in Fig. P 7.56 has...Ch. 7 - Prob. 57PCh. 7 - Prob. 58PCh. 7 - Prob. 59PCh. 7 - The switch in the circuit shown in Fig. P 7.61 has...Ch. 7 - Prob. 62PCh. 7 - Prob. 63PCh. 7 - Prob. 64PCh. 7 - Prob. 65PCh. 7 - Prob. 66PCh. 7 - Prob. 67PCh. 7 - Prob. 68PCh. 7 - Prob. 69PCh. 7 - Prob. 70PCh. 7 - Prob. 71PCh. 7 - Prob. 72PCh. 7 - Prob. 73PCh. 7 - For the circuit in Fig. P 7.73, how many...Ch. 7 - Prob. 75PCh. 7 - Prob. 76PCh. 7 - Prob. 77PCh. 7 - Prob. 78PCh. 7 - Prob. 79PCh. 7 - Prob. 80PCh. 7 - Prob. 81PCh. 7 - Prob. 82PCh. 7 - Prob. 84PCh. 7 - Prob. 85PCh. 7 - Prob. 86PCh. 7 - Prob. 87PCh. 7 - Prob. 88PCh. 7 - Prob. 90PCh. 7 - Prob. 91PCh. 7 - Prob. 92PCh. 7 - Prob. 93PCh. 7 - Prob. 94PCh. 7 - Prob. 95PCh. 7 - Prob. 100PCh. 7 - Prob. 101PCh. 7 - Prob. 102PCh. 7 - Prob. 103PCh. 7 - Prob. 104PCh. 7 - Prob. 105PCh. 7 - Prob. 106PCh. 7 - Prob. 107P
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