Question No. 1. The power factor of a squirrel cage induction motor is
(A) low at light load only.
(B) low at heavy load only.
(C) low at light and heavy load both.
(D) low at rated load only.
Ans: A
Question No. 2. Systematic errors are
(a) instrumental errors
(b) environmental errors
(c) observational errors
(d) all of the above
Ans: d
Question No. 3. Which of the following statements is correct for any closed loop system ?
(a) All the co-efficients can have zero value
(6) All the co-efficients are always non-zero
(c) Only one of the static error co-efficients has a finite non-zero value
(d) None of the above
Ans: c
Question No. 4 The temperature of resistance furnaces can be controlled by changing the:
(A) applied voltage (B) number of heating elements
(C) circuit configuration (D) All of the above
Ans: D
Question No. 5. A Weston synchronoscope is a
(a) moving coil instrument
(b) moving iron instrument
(c) dynamometer instrument
(d) none of the above
Ans: c
Question No. 6. Reduction in the capacitance of a capacitor-start motor, results in reduced
(A) Noise. (B) Speed.
(C) Starting torque. (D) Armature reaction.
Ans: C
Question No. 7. To avoid the effect of stray magnetic field in A.C. bridges we can use
(a) magnetic screening
(b) Wagner earthing device
(c) wave filters
(d) any of the above
Ans: a
Question No. 8. The efficiency of a transformer is mainly dependent on
(A) core losses. (B) copper losses.
(C) stray losses. (D) dielectric losses.
Ans: A
Question No. 9. Velocity error constant of a system is measured when the input to the system is unit
_______ function.
(a) parabolic
(b) ramp
(c) impulse
(d) step
Ans: b
Question No. 10. Which of the following devices should be used for accurate measurement of low D.C.
voltage ?
(a) Small range moving coil voltmeter
(b) D.C. potentiometer
(c) Small range thermocouple voltmeter
(d) None of the above
Ans: b
(A) low at light load only.
(B) low at heavy load only.
(C) low at light and heavy load both.
(D) low at rated load only.
Ans: A
(a) instrumental errors
(b) environmental errors
(c) observational errors
(d) all of the above
Ans: d
Question No. 3. Which of the following statements is correct for any closed loop system ?
(a) All the co-efficients can have zero value
(6) All the co-efficients are always non-zero
(c) Only one of the static error co-efficients has a finite non-zero value
(d) None of the above
Ans: c
Question No. 4 The temperature of resistance furnaces can be controlled by changing the:
(A) applied voltage (B) number of heating elements
(C) circuit configuration (D) All of the above
Ans: D
Question No. 5. A Weston synchronoscope is a
(a) moving coil instrument
(b) moving iron instrument
(c) dynamometer instrument
(d) none of the above
Ans: c
Question No. 6. Reduction in the capacitance of a capacitor-start motor, results in reduced
(A) Noise. (B) Speed.
(C) Starting torque. (D) Armature reaction.
Ans: C
Question No. 7. To avoid the effect of stray magnetic field in A.C. bridges we can use
(a) magnetic screening
(b) Wagner earthing device
(c) wave filters
(d) any of the above
Ans: a
Question No. 8. The efficiency of a transformer is mainly dependent on
(A) core losses. (B) copper losses.
(C) stray losses. (D) dielectric losses.
Ans: A
Question No. 9. Velocity error constant of a system is measured when the input to the system is unit
_______ function.
(a) parabolic
(b) ramp
(c) impulse
(d) step
Ans: b
Question No. 10. Which of the following devices should be used for accurate measurement of low D.C.
voltage ?
(a) Small range moving coil voltmeter
(b) D.C. potentiometer
(c) Small range thermocouple voltmeter
(d) None of the above
Ans: b
Comments
Post a Comment