991 + Mcqs in Machine Design Page 17 McqOptions

801.	A multirangq instrument has
A.	multiple shunt or series resistances inside the meter
B.	multicoii arrangement
C.	variable turns of coil
D.	multi range meters inside the measurement system
E.	any of the above
Answer» B. multicoii arrangement

Discussion

802.	The adjustment of position of shading bands, in an energy meter is done to provide
A.	friction compensation
B.	creep compensation
C.	braking torque
D.	none of the above
Answer» B. creep compensation

Discussion

803.	In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be
A.	out of phase by 90°
B.	out of phase by 60°
C.	out of phase by 30°
D.	out of phase by 0°
Answer» B. out of phase by 60°

Discussion

804.	For measuring current at high frequency we should use
A.	moving iron instrument
B.	electrostatic instrument
C.	thermocouple instrument
D.	none of the above
Answer» D. none of the above

Discussion

805.	Volt box is a component to
A.	extend voltage range
B.	measure voltage
C.	compare voltage in a box
D.	none of the above
Answer» B. measure voltage

Discussion

806.	A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.
A.	ammeter
B.	voltmeter
C.	flux-meter
D.	ballistic galvanometer
Answer» B. voltmeter

Discussion

807.	In a D.C. machine, the value of peripheral speed should not, normally, exceed
A.	10 m/s
B.	20 m/s
C.	30 m/s
D.	40 m/s
Answer» D. 40 m/s

Discussion

808.	In a meggar controlling torque is provided by
A.	spring
B.	gravity
C.	coil
D.	eddy current
Answer» D. eddy current

Discussion

809.	In a portable instrument, the controlling torque is provided by
A.	spring
B.	gravity
C.	eddy currents
D.	all of the above
Answer» B. gravity

Discussion

810.	In an energy meter braking torque is produced to
A.	safe guard it against creep
B.	brake the instrument
C.	bring energy meter to stand still
D.	maintain steady speed and equal to driving torque
Answer» E.

Discussion

811.	The forced oil and air circulation method is usual one for transformers of capacities
A.	upto 5 MVA
B.	upto 10 MVA
C.	upto 20 MVA
D.	30 MVA upwards
Answer» E.

Discussion

812.	The cylindrical windings using circular conductors are used for current rating of
A.	upto 20 A
B.	upto 40 A
C.	upto 60 A
D.	upto 80 A
Answer» E.

Discussion

813.	Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
A.	Increased I R losses
B.	Increased core losses
C.	Poor commutation
D.	Change in motor parameters
E.	All of the above
Answer» F.

Discussion

814.	The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
A.	single-phase winding
B.	two-phase winding
C.	three-phase winding
D.	any of the above
Answer» C. three-phase winding

Discussion

815.	Which of the following is the major consideration to evolve a good design ?
A.	Cost
B.	Durability
C.	Compliance with performance criteria as laid down in specifications
D.	All of the above
Answer» E.

Discussion

816.	The principle on which vector voltmeter is based is
A.	that it works on the principle of complex variation
B.	that it measures the response of linear ramp voltage
C.	same as digital meter
D.	that it measures the amplitude of a single at two points and at the same time measures their phase difference
Answer» E.

Discussion

817.	Operating torques in analogue instruments are
A.	deflecting and control
B.	deflecting and damping
C.	deflecting, control and damping
D.	vibration and balancing
Answer» D. vibration and balancing

Discussion

818.	The insulation between windings and grounded core and the insulation between the windings of the same phase is
A.	minor insulation
B.	major insulation
C.	either of the above
D.	none of the above
Answer» B. major insulation

Discussion

819.	Which of the following is an advantage of hydrogen cooling?
A.	Increase in efficiency
B.	Increase in ratings
C.	Increase in life
D.	All of the above
Answer» E.

Discussion

820.	Which of the following brushes can be used for high values of current density ?
A.	Metal graphite brushes
B.	Hard carbon brushes
C.	Electro-graphitic brushes
D.	Natural graphite brushes
Answer» B. Hard carbon brushes

Discussion

821.	The operating voltage of a meggar is about
A.	6 V
B.	12 V
C.	40 V
D.	100 V
Answer» E.

Discussion

822.	Which of the following devices may be used for extending the range of instruments ?
A.	Shunts
B.	Multipliers
C.	Current transformers
D.	Potential transformers
E.	All of the above
Answer» F.

Discussion

823.	In a low power factor wattmeter the compensating coil is connected
A.	in series with current coil
B.	in parallel with current coil
C.	in series with pressure coil
D.	in parallel with pressure coil
Answer» D. in parallel with pressure coil

Discussion

824.	For measurement of mutual inductance we can use
A.	Anderson bridge
B.	Maxwell’s bridge
C.	Heaviside bridge
D.	Any of the above
Answer» D. Any of the above

Discussion

825.	In D.C. machines, the ________ in field mmf results in increase in size and cost of machines.
A.	increase
B.	decrease
C.	either of the above
D.	none of the above
Answer» B. decrease

Discussion

826.	A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
A.	deflecting
B.	controlling
C.	damping
D.	any of the above
Answer» D. any of the above

Discussion

827.	A Weston frequency meter is
A.	moving coil instrument
B.	moving iron instrument
C.	dynamometer instrument
D.	none of the above
Answer» C. dynamometer instrument

Discussion

828.	_______ instruments are those which measure the total quantity of electricity delivered in a particular time.
A.	Absolute
B.	Indicating
C.	Recording
D.	Integrating
Answer» E.

Discussion

829.	In majority of instruments damping is provided by
A.	fluid friction
B.	spring
C.	eddy currents
D.	all of the above
Answer» D. all of the above

Discussion

830.	In D.C. machines the usual limit of slot pitch is
A.	between 5 to 10 mm
B.	between 10 to 15 mm
C.	between 15 to 20 mm
D.	between 25 to 35 mm
Answer» E.

Discussion

831.	Machines cooled by direct cooling method may be called
A.	supercharged
B.	inner cooled
C.	conductor cooled
D.	any of the above
Answer» E.

Discussion

832.	A moving iron instrument can be used for
A.	D.C. only
B.	A.C. only
C.	both D.C. and A.C.
D.	neither D.C. and A.C.
Answer» D. neither D.C. and A.C.

Discussion

833.	The desirable static characteristics of a measuring system are
A.	accuracy and reproducibility
B.	accuracy, sensitivity and reproducibility
C.	drift and dead zone
D.	static error
Answer» C. drift and dead zone

Discussion

834.	In an Anderson bridge, the unknown inductance is measured in terms of
A.	known inductance and resistance
B.	known capacitance and resistance
C.	known resistance
D.	known inductance
Answer» C. known resistance

Discussion

835.	Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as
A.	small size machines
B.	medium size machines
C.	large size machines
D.	any of the above
Answer» C. large size machines

Discussion

836.	The stator of a D.C. machine comprises of
A.	main poles
B.	interpoles
C.	frame
D.	all of the above
Answer» E.

Discussion

837.	The slot leakage can be calculated by making which of the following assumptions ?
A.	The current in the slot conductors is uniformly distributed over their cross-section
B.	The leakage path is straight across the slot and around the iron at the bottom
C.	The permanence of air paths is only considered. The reluctance of iron paths is assumed as zero
D.	All of the above
Answer» E.

Discussion

838.	The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
A.	conduction
B.	convection
C.	radiation
D.	any of the above
Answer» D. any of the above

Discussion

839.	Electrical machines having a power output up to about 750 W may be called_______machines.
A.	small size
B.	medium size
C.	large size
D.	any of the above
Answer» B. medium size

Discussion

840.	The pointer of an indicating instrument should be
A.	very light
B.	very heavy
C.	either (A) or (B)
D.	neither (A) nor (B)
Answer» B. very heavy

Discussion

841.	The ratio of maximum displacement deviation to full scale deviation of the instrument is called
A.	static sensitivity
B.	dynamic deviation
C.	linearity
D.	precision or accuracy
Answer» D. precision or accuracy

Discussion

842.	Cylindrical windings using circular conductors, employed in transformers, are
A.	single layered
B.	double layered
C.	multi-layered
D.	none of the above
Answer» D. none of the above

Discussion

843.	The surge phenomenon is particularly important in case of
A.	low voltage transformers
B.	medium voltage transformers
C.	high voltage transformers
D.	any of the above
Answer» D. any of the above

Discussion

844.	Impose limitation on design.
A.	Saturation
B.	Temperature rise
C.	Efficiency
D.	Power factor
E.	All above
Answer» F.

Discussion

845.	Multilayer helical windings are commonly used in the transformers as high voltage windings
A.	upto 20 kV
B.	upto 50 kV
C.	upto 80 kV
D.	for 110 kV and above
Answer» E.

Discussion

846.	Which of the following essential features is possessed by an indicating instrument ?
A.	Deflecting device
B.	Controlling device
C.	Damping device
D.	All of the above
Answer» E.

Discussion

847.	Dummy coil should not be used in
A.	small machines
B.	large machines
C.	either (A) or (B)
D.	none of the above
Answer» C. either (A) or (B)

Discussion

848.	The flash point of transformer oil should be higher than
A.	40°C
B.	60°C
C.	80°C
D.	104°C
Answer» E.

Discussion

849.	The household energy meter is
A.	an indicating instrument
B.	a recording instrument
C.	an integrating instrument
D.	none of the above
Answer» D. none of the above

Discussion

850.	Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto
A.	10 MW
B.	30 MW
C.	60 MW
D.	150 MW
Answer» D. 150 MW

Discussion

Explore topic-wise MCQs in GATE (Mechanical Engineering).

A multirangq instrument has

The adjustment of position of shading bands, in an energy meter is done to provide

In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be

For measuring current at high frequency we should use

Volt box is a component to

A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.

In a D.C. machine, the value of peripheral speed should not, normally, exceed

In a meggar controlling torque is provided by

In a portable instrument, the controlling torque is provided by

In an energy meter braking torque is produced to

The forced oil and air circulation method is usual one for transformers of capacities

The cylindrical windings using circular conductors are used for current rating of

Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a

Which of the following is the major consideration to evolve a good design ?

The principle on which vector voltmeter is based is

Operating torques in analogue instruments are

The insulation between windings and grounded core and the insulation between the windings of the same phase is

Which of the following is an advantage of hydrogen cooling?

Which of the following brushes can be used for high values of current density ?

The operating voltage of a meggar is about

Which of the following devices may be used for extending the range of instruments ?

In a low power factor wattmeter the compensating coil is connected

For measurement of mutual inductance we can use

In D.C. machines, the ________ in field mmf results in increase in size and cost of machines.

A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly

A Weston frequency meter is

_______ instruments are those which measure the total quantity of electricity delivered in a particular time.

In majority of instruments damping is provided by

In D.C. machines the usual limit of slot pitch is

Machines cooled by direct cooling method may be called

A moving iron instrument can be used for

The desirable static characteristics of a measuring system are

In an Anderson bridge, the unknown inductance is measured in terms of

Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as

The stator of a D.C. machine comprises of

The slot leakage can be calculated by making which of the following assumptions ?

The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.

Electrical machines having a power output up to about 750 W may be called_______machines.

The pointer of an indicating instrument should be

The ratio of maximum displacement deviation to full scale deviation of the instrument is called

Cylindrical windings using circular conductors, employed in transformers, are

The surge phenomenon is particularly important in case of

Impose limitation on design.

Multilayer helical windings are commonly used in the transformers as high voltage windings

Which of the following essential features is possessed by an indicating instrument ?

Dummy coil should not be used in

The flash point of transformer oil should be higher than

The household energy meter is

Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto